7.2 Ingenieurbau
Filtern
Dokumenttyp
- Vortrag (169)
- Beitrag zu einem Tagungsband (67)
- Zeitschriftenartikel (20)
- Posterpräsentation (10)
- Dissertation (4)
- Beitrag zu einem Sammelband (3)
- Buchkapitel (2)
- Tagungsband (Herausgeberschaft für den kompletten Band) (1)
- Sonstiges (1)
Sprache
- Englisch (200)
- Deutsch (76)
- Mehrsprachig (1)
Referierte Publikation
- nein (277) (entfernen)
Schlagworte
- Structural Health Monitoring (22)
- Ground vibration (18)
- Fatigue (11)
- Offshore wind energy (11)
- Structural health monitoring (11)
- Monitoring (10)
- Brücken (9)
- Offshore (9)
- Impact (8)
- Building vibration (7)
- Damage characterization (7)
- Planar tomography (7)
- SHM (7)
- Vibration measurements (7)
- Bahnerschütterungen (6)
- Design methods (6)
- Deterioration (6)
- Hammer impact (6)
- Layered soil (6)
- Model interpolation (6)
- Numerical modelling (6)
- Offshore wind turbines (6)
- Physical phenomenology (6)
- Pile foundations (6)
- Soil-structure interaction (6)
- Structural systems (6)
- Grout (5)
- Inspection (5)
- Numeric simulation (5)
- Reinforced concrete structure (5)
- Train passage (5)
- Train-induced ground vibration (5)
- Vibration (5)
- Windenergie (5)
- Bayesian updating (4)
- Container loading (4)
- Crack detection (4)
- Damage detection (4)
- Datenmanagement (4)
- Drop test (4)
- Environmental effects (4)
- Erschütterungen (4)
- Erschütterungsminderung (4)
- Excitation forces (4)
- Foundation load (4)
- Foundations (4)
- Gründungsstrukturen (4)
- High-strength concrete (4)
- Interface (4)
- Layered soils (4)
- Modalanalyse (4)
- Reliability (4)
- Repair (4)
- Shell Buckling (4)
- Slab track (4)
- Steel structures (4)
- Temperature rejection (4)
- Ultrasonic testing (4)
- Vehicle-track-soil interaction (4)
- Wind Energy (4)
- BIM (3)
- Belastungsversuch (3)
- Bridges (3)
- Buckling (3)
- Compaction Grouting (3)
- Damage localization (3)
- Deep foundations (3)
- Dispersionsmessung (3)
- Elastische Gleiselemente (3)
- Emission (3)
- Erosion (3)
- Erschütterungsprognose (3)
- Fault detection (3)
- Großer Fallturm Horstwalde (3)
- Inspection planning (3)
- Leichtbau (3)
- Maintenance (3)
- Material moisture (3)
- Mitigation (3)
- Monopiles (3)
- Offshore Pile Foundation (3)
- Offshore Windenergieanlagen (3)
- Offshore foundations (3)
- Offshore geomechanics (3)
- Physical testing (3)
- Probabilistic (3)
- Reinforced concrete (3)
- Schwingungsdynamik (3)
- Soil properties (3)
- Subspace methods (3)
- Temperature effects (3)
- Train speed (3)
- Tunnel (3)
- Vibration measurement (3)
- Wellenausbreitung (3)
- Wellengeschwindigkeit (3)
- Wind (3)
- Zivile Sicherheit (3)
- 2-span bridge (2)
- AISTEC (2)
- Acceleration sensors (2)
- Acoustic emission testing (2)
- Amplitude-charge weight laws (2)
- Amplitude-distance laws (2)
- Analysis of variance (2)
- Ansys Autodyn (2)
- Apartment building (2)
- Artificial intelligence (2)
- Attenuation (2)
- Automatisierte schweißtechnische Fertigung (2)
- Axle-sequence spectrum (2)
- Bayes'sche Analyse (2)
- Bayesian System Identification (2)
- Bayesian methods (2)
- Bemessung (2)
- Big Data (2)
- Bitumen (2)
- Bodenübertragungsfunktion (2)
- Box-Behnken (2)
- Brücke (2)
- Cable failure (2)
- Cable-stayed bridge (2)
- Changing process noise (2)
- Chemisoprtion (2)
- Climate chamber (2)
- Compressive Cyclic loading (2)
- Compressive cyclic loading (2)
- Compressive strength (2)
- Coupled fluid-particle simulation (2)
- Coupler systems (2)
- Crack formation (2)
- Crack pattern (2)
- Cracks (2)
- Cyclic load (2)
- DEM (2)
- DUCON® (2)
- Design (2)
- Digital twin (2)
- Displacements (2)
- Drone (2)
- Drucker-Prager (2)
- Ductility (2)
- E-modulus (2)
- Earth masonry (2)
- Elastische Elemente (2)
- Energy (2)
- Erschütterungsausbreitung (2)
- Evaluation (2)
- Explosion-induced ground vibrations (2)
- Faseroptik (2)
- Feuchte (2)
- Filter effects (2)
- Finite Elemente Simulation (2)
- Finite element models (2)
- Fly ash (2)
- Freight train (2)
- GPU parallel computation (2)
- Gleiströge (2)
- Ground vibration measurements (2)
- Grouted Connection (2)
- Grouted connection (2)
- Grouting (2)
- Halbraum (2)
- High-performance computing (2)
- High-speed (2)
- High-speed train (2)
- Immission (2)
- Injection Sequence (2)
- Irregularities (2)
- Klimakammer (2)
- Knudsen effect (2)
- Laboratory beam structure (2)
- Lehm (2)
- Linear parameter varying systems (2)
- Load vector (2)
- Long-term shrinkage (2)
- Macromechanical Sample Strength (2)
- Material tests (2)
- Mauerwerk (2)
- Measurement (2)
- Measurements (2)
- Messen im Bauwesen (2)
- Metakaolin (2)
- Micro silica (2)
- Micro-reinforcement (2)
- Micromechanical Tensile Failure (2)
- Micromechanical modelling (2)
- Mobile elements (2)
- Modal Analysis (2)
- Model updating (2)
- Molecular diffusion (2)
- Non destructive testing (2)
- Non-destructive testing (2)
- Numerical model (2)
- Numerical modeling (2)
- Office tower (2)
- Offshore Wind (2)
- Offshore Wind Energy (2)
- Offshore Windenergy Pile Buckling (2)
- Offshore geotechnics (2)
- Offshore wind (2)
- Offshore wind turbine (2)
- Offshore-Windenergieanlagen (2)
- Optimal Sensor Placement (2)
- Passenger train (2)
- Physisorption (2)
- Pile Foundation (2)
- Pile Tip Buckling (2)
- Post-impact evaluation (2)
- Prediction (2)
- Prediction of explosion induced ground and building vibration (2)
- Prädiktive Instandhaltung (2)
- Quasi-static and dynamic tests (2)
- Radar (2)
- Railway (2)
- Railway bridge (2)
- Railway tunnel (2)
- Railways (2)
- Randomly heterogeneous soil (2)
- Rehabilitation (2)
- Reinforcement (2)
- Repowering (2)
- Research data management (2)
- Risk (2)
- Risslumineszenz (2)
- SDDLV (2)
- Scattering (2)
- Schadensdetektion (2)
- Schwingungsbasierte Verfahren (2)
- Size effect (2)
- Slenderness effect (2)
- Soil-Structure-Interaction (2)
- Soil-pile interaction (2)
- Soil-wall-floor model (2)
- Static load (2)
- Statistical evaluation (2)
- Statistical method (2)
- Stereo photogrammetry (2)
- Subspace-based method (2)
- Subspace-based residual (2)
- Suction bucket (2)
- Supplementary cementitious materials (2)
- Surface-tunnel reduction (2)
- System Identification (2)
- Tensile Capacity (2)
- Time-variant reliability (2)
- Tomographic damage evaluation (2)
- Track damage (2)
- Train excitation (2)
- Transmission (2)
- UHPC (2)
- Umwelteinflüsse (2)
- Unterraummethoden (2)
- Value of Information (2)
- Vehicle-track interaction (2)
- Verkehrsinfrastukturen (2)
- Vibrations (2)
- Vollraum (2)
- Wellenausbreitung in der Tiefe (2)
- Wind Turbines (2)
- Windenergy (2)
- Zuggeschwindigkeit (2)
- Zuverlässigkeit (2)
- 3D imaging (1)
- Achsfolgespektren (1)
- Achsimpulse (1)
- Amplituden-Abstands-Gesetze (1)
- Analytical Design Methods (1)
- Artificial Intelligence (1)
- Asphalt (1)
- Assessment (1)
- Asymptotic local approach (1)
- Automatic modal parameters identification (1)
- Automatisierte Fertigung (1)
- Automatisierte schweißtechniche Fertigung (1)
- Axial load bearing (1)
- Axle impulses (1)
- Axle loads (1)
- Axle pulses (1)
- BAM Windenergie Fügetechnik (1)
- Bahngleis (1)
- Ballast track (1)
- Base isolation (1)
- Baugrunddynamik (1)
- Bauteile (1)
- Bauwerk-Boden-Wechselwirkung (1)
- Bauwerke (1)
- Bauwerksmonitoring (1)
- Bauwerksüberwachung (1)
- Bayesian analysis (1)
- Bayesian system identification (1)
- Beanspruchungszustand (1)
- Belastungsfahrt (1)
- Belastungszug (1)
- Beton (1)
- Betonautobahn (1)
- Betonautobahnen (1)
- Beulen (1)
- Bewertung (1)
- Bionik (1)
- Blast (1)
- Blast tests (1)
- Bodenschlitz (1)
- Bodenvariabilität (1)
- Boundary element method (1)
- Bridge (1)
- Bridge monitoring (1)
- Bruchlastwechselzahlen (1)
- Brückensicherheit (1)
- Buckling piles circular shells (1)
- Building information modelling (1)
- Building response (1)
- Bulging (1)
- CFD (1)
- Cars (1)
- Centerline solidification cracking (1)
- Chemisorption (1)
- Civil structures (1)
- Climate Chamber (1)
- Cohesive soils (1)
- Column/wall resonance (1)
- Combined finite-element boundary-element method (1)
- Components of excitation (1)
- Computer Vision (1)
- Concrete (1)
- Conductor (1)
- Crack (1)
- Crack Luminescence (1)
- Crack growth (1)
- Crack repair (1)
- Cyclic axial shearing (1)
- Cyclic degradation (1)
- DEM-LBM simulation (1)
- Damage Detection (1)
- Damage Identification (1)
- Damage identification (1)
- Deckeneigenfrequenzen (1)
- Deckenschwingungen (1)
- Design models (1)
- Design practice (1)
- Detection (1)
- DiMoWind RDS-PP Maintenance Digital Twin Offshore Wind Energy (1)
- Digital Image Correlation (1)
- Digital Models (1)
- Digital Twin (1)
- Digitale Zwillinge (1)
- Digitalisierung (1)
- Drop Test (1)
- Drop Tests (1)
- Drop tower (1)
- Druckfestigkeit (1)
- Druckschwellenversuch (1)
- Dynamic excitation (1)
- Dynamic loads (1)
- Dynamic soil properties (1)
- Dynamische Bodenkennwerte (1)
- Dynamische Bodensteifigkeit (1)
- Dämpfung (1)
- EERA Joint Program (1)
- Earth (1)
- Earth material (1)
- Earthen hydraulic constructions (1)
- Earthen hydraulic infrastructures (1)
- Einflusslinie (1)
- Einflusslinien (1)
- Einfügungsdämmung (1)
- Elastische Gebäudelagerung (1)
- End-of-life decision making (1)
- Entscheidungsfindung (1)
- Environmental (1)
- Environmental Effects (1)
- Environmental and Operational Variability (1)
- Environmental influence (1)
- Erhaltungsmanagement (1)
- Ermüdungsprüfung (1)
- Ermüdungsschäden (1)
- Ermüdungsverhalten (1)
- Erneuerbare Energien (1)
- Erosion of cohesive soils (1)
- Erschütterungen im Fernfeld (1)
- FEM (1)
- FEM analysis (1)
- Fahrzeug-Fahrweg-Boden-Wechselwirkung (1)
- Fallturm (1)
- Fatigue damage (1)
- Fatigue deterioration (1)
- Fiber optic sensing (1)
- Finite element method (1)
- Finite element model updating (1)
- Finite-Elemente-Modellkalibrierung (1)
- Flexibility (1)
- Flexible car body (1)
- Flexible wheelset (1)
- Floor resonance (1)
- Floors (1)
- Fluid-structure interaction (1)
- Footbridge (1)
- Force reconstruction (1)
- Foundation Pile (1)
- Foundation reliability analysis (1)
- Freileitung (1)
- Frequency response function (1)
- GMNIA (1)
- GNSS (1)
- GPU parallelisation (1)
- Gebäudelagerung (1)
- Gebäudemodelle (1)
- Gebäudeschwingungen (1)
- Gekoppelte Fluid-Partikel Simulationen (1)
- Geomechanics (1)
- Geomechanics of offshore foundations (1)
- Geometrie (1)
- Global ambient vibrations (1)
- Granular Cohesive Materials (1)
- Granular Cohesive Materials, (1)
- Ground (1)
- Grout Injection (1)
- HTLS (1)
- Hard impact (1)
- Harter Anprall an Stahlbetonstrukturen (1)
- High-Rise Building (1)
- High-rise buildings (1)
- Horizontal stress (1)
- IEPE (1)
- Impact damage of reinforced concrete (1)
- Impact damage on reinforced concrete (1)
- Impakt (1)
- Impedanzmethode (1)
- Inertial Interaction (1)
- Inertial interaction (1)
- Inhomogeneous soils (1)
- Innovative Messtechnik (1)
- Inspeciton (1)
- Inspektion (1)
- Interface model (1)
- Irregular ballast (1)
- Irregular soil (1)
- Jacket support structure (1)
- Jet erosion test (1)
- Kinematic Interaction (1)
- Kinematic interaction (1)
- Kraft auf den Boden (1)
- LBM-DEM (1)
- LBM-DEM coupling (1)
- LBM-DEM simulation (1)
- Laminography (1)
- Laser beam welding (1)
- Lateral load bearing (1)
- Leichtbauprinzipien (1)
- Lifetime Extension (1)
- Load Test (1)
- Load bearing behaviour (1)
- Load-bearing (1)
- Long-span bridge (1)
- Low-frequency shaker (1)
- Luminescence (1)
- MEMS (1)
- Maintal Bridge Gemuenden (1)
- Maintalbrücke Gemünden (1)
- Maintenance Digital Twin Offshore Wind Energy (1)
- Marine geomechanics (1)
- Marine geotechnics (1)
- Maschinenbetrieb (1)
- Maschinenfundament (1)
- Material Point Method (1)
- Material model (1)
- Measurement campaigns (1)
- Mechanical challenges (1)
- Messfahrt (1)
- Microfine cement (1)
- Micromechanical LBM-DEM simulation (1)
- Micromechanical analysis (1)
- Micromechanical simulation (1)
- Minderungsmaßnahmen (1)
- Mix design (1)
- Modal force spectrum (1)
- Modal load spectrum (1)
- Modal system identification (1)
- Model Building (1)
- Model Update (1)
- Model Updating (1)
- Modellierung (1)
- Modes (1)
- Modes and waves (1)
- Moisture (1)
- Monopile (1)
- Monopile Buckling (1)
- Monopile installation risks (1)
- Movin load test (1)
- Multi-beam method (1)
- Multiple impact (1)
- NDT (1)
- Nachgiebigkeiten (1)
- Nelson’s method (1)
- Non-Destructive Evaluation (1)
- Normung (1)
- Numerical analysis (1)
- Numerical damage simulation (1)
- Numerical simulation (1)
- Numerical simulation of impact damage (1)
- Numerical simulations (1)
- Numerische Analysen (1)
- Offhore (1)
- Office building (1)
- Offshore Structures (1)
- Offshore Wind Energy Converter (1)
- Offshore Windenergie (1)
- Offshore pile foundations (1)
- Offshore wind energy foundations (1)
- Offshore wind farm (1)
- Offshore wind farms (1)
- Offshore wind-turbine foundations (1)
- Offshore-Wind (1)
- Offshore-Windkraftanlagen (1)
- Operational modal analysis (1)
- Optimierungsmethoden (1)
- Optimization techniques (1)
- Pfahlfußbeulen (1)
- Pfahlnachgiebigkeiten (1)
- Physisoprtion (1)
- Pile Buckling (1)
- Pile Capacity (1)
- Pile ageing (1)
- Pile groups (1)
- Pile retrofit system (1)
- Pile-Tip-Buckling (1)
- Point Cloud (1)
- Predictive maintenance (1)
- Probabilistic modelling (1)
- Probabilitische Ingenieurmodelle (1)
- Probability of Detection (1)
- Probability of detection (1)
- Probekörpergeometrien (1)
- Prognose (1)
- Propagation from a tunnel (1)
- Railbridge (1)
- Railway induced vibration (1)
- Railway track (1)
- Railway tracks (1)
- Railway trafiic (1)
- Randelementmethode (1)
- Rayleighwellendispersion (1)
- Rechenmodelle (1)
- Rechenverfahren (1)
- Referenzbeispiel (1)
- Residential building (1)
- Residual evaluation (1)
- Richtige Fahrzeugmasse (1)
- Rigid vehicle model (1)
- Risiko (1)
- Risikoanalyse (1)
- Risk-based maintenance planning (1)
- Rissprozes (1)
- Rissprozess (1)
- SHM Environmental (1)
- Safety (1)
- Scaling (1)
- Scattered axle impulses (1)
- Schadensüberwachung (1)
- Scherwellengeschwindigkeit (1)
- Schienenfahrweg (1)
- Schienenfahrwege (1)
- Schubmodul (1)
- Schwingungsmessungen (1)
- Schwingungsmonitoring (1)
- Schädigungsprozesse (1)
- Sensitivity vectors (1)
- Shearing (1)
- Shrinkage (1)
- Sicherheit (1)
- Simple and fast prediction (1)
- Simple prediction (1)
- Simulation and experiment (1)
- Site-characterization (1)
- Soft impact (1)
- Soft track elements (1)
- Soil Struture Interaction (1)
- Soil erosion (1)
- Soil-building interaction (1)
- Soil-building resonance (1)
- Soil-wall floor model (1)
- Soil-water-structure interaction (1)
- Spatially varying ground conditions (1)
- Spektralanalyse (1)
- Stability Buckling soil-structure-interaction piles offshore (1)
- Stabilität (1)
- State of stress (1)
- Statistical correlations (1)
- Statistical tests (1)
- Statistische Auswertung (1)
- Statistische Korrelationen (1)
- Stochastic Subspace Damage Detection (1)
- Strength (1)
- Stress stiffening (1)
- Structural Systems (1)
- Structural integrity (1)
- Structural integrity maintenance (1)
- Structural integrity management (1)
- Strukturmonitoring (1)
- Störgrößen (1)
- Substructures (1)
- Suction Bucket (1)
- Support structures (1)
- Surface Foundation (1)
- Surface line (1)
- Switch (1)
- System identification (1)
- Systemidentifikation (1)
- TOP (1)
- Tagung (1)
- Temperatureinflüsse (1)
- Tensile test (1)
- Test specification (1)
- Tip Buckling (1)
- Track and vehicle irregularities (1)
- Track beam (1)
- Track damage monitoring (1)
- Track damage quantification (1)
- Track vibration (1)
- Track-soil interaction (1)
- Tragfähigkeit (1)
- Tragstrukturen (1)
- Train configuration (1)
- Train passages (1)
- Tran speed (1)
- Transfer fuction (1)
- Transfer function (1)
- Truss structures (1)
- Tunnel line (1)
- Tunnel-pile transfer (1)
- Tunnelstrecke (1)
- Turnout (1)
- Un- certainty (1)
- Uncertainty (1)
- Uncertainty in reference (1)
- Uncertainty quantification (1)
- Under-sleeper pads (1)
- Varying soil stiffness (1)
- Varying stiffness (1)
- Varying track stiffness (1)
- Vibration analysis (1)
- Vibration excitation (1)
- Vibration monitoring (1)
- Wahrscheinlichkeit (1)
- Water-structure interaction (1)
- Wave propagation (1)
- Wave-Tower interaction (1)
- Wavenumber integrals (1)
- Wavenumber method (1)
- Waves (1)
- Welded (1)
- Wellenfeldberechnung (1)
- Wheelset accelerations (1)
- Wind Energy Structures (1)
- Wind energy (1)
- Wind turbines (1)
- Wind-farm aerodynamics (1)
- Windenergieanlagen (1)
- Windfarm wake analysis (1)
- Zerstreute Achsimpulse (1)
- building information modelling (1)
- elastische Gebäudelagerungen (1)
- fachwerkartige Stahltragwerken (1)
- risk, reliability, inspection planning, offshore wind turbines (1)
- structural health monitoring (1)
- structural integrity management (1)
- support structures (1)
- zerstreute Achslastimpulse (1)
- Übertragungsmatrizen (1)
- Überwachung (1)
Organisationseinheit der BAM
- 7.2 Ingenieurbau (277) (entfernen)
Measurements of ground and track vibrations have been performed at a high-speed line in northern Germany. Impacts on the track and the ground, and passages of different trains with different speeds on different tracks have been measured. Transfer functions of the soil are presented and approximated by theoretical soil models. By using these transfer functions, the measured ground vibration between 2 to 64 m distance from the track can be transformed into a load spectrum which can be used for predictions at other sites. The method is compared to the soil-dependent method of an emission spectrum at a certain distance (8 m for example). The influence of train type, speed and track type is discussed on the base of the different emission quantities and the original measurements. The strong influence of the track, ballast track and slab track, is analysed by a theoretical model in wavenumber domain. The response of the track to the passage of the static load is reduced by the stiffness of the slab, the deformation of the track as well as the impulse acting on the soil. Usually, the impulse on the soil should result in a slow quasi-static movement of the soil, slower at further distances. In a heterogeneous soil, however, the impulses from the static loads scatter and keep parts of the higher impulse frequency band. In this case the reduced impulse spectra of the slab track will yield reduced ground vibration in a certain frequency band. Additional (BAM and international) measurements will be used to discuss this and possible other explanations for the different ground vibration differences.
Im ersten Teil werden Methoden der Wellenanalyse vorgestellt, Seismogramme, Multistation Analysis of Surface Waves (MASW), f,v-Analyse (Dispersion aus zweifacher Fourier-Analyse), Spatial AutoCorrelation (SPAC, hier auch für deterministische Quellen), und auf Messungen in Deutschland, Österreich und der Schweiz angewendet. Mit den Wellengeschwindigkeiten des Bodens werden die Berechnungsgrundlagen für die Erschütterungsausbreitung im Boden und die Bauwerk-Boden-Wechselwirkung geschaffen.
Der zweite Teil beschäftigt sich mit der Wellensynthese, das heißt mit der Berechnung von Wellenfeldern (aus Wellenzahlintegralen). Die Rechnungen können wesentlich vereinfacht werden, wenn man die Dimensionsanalyse und Symmetrieüberlegungen ausnutzt, so dass maximal fünf dimensionslose Verschiebungsfunktionen verbleiben (im Vollraum sind es sogar nur zwei Verschiebungsfunktionen, die sich einfach explizit angeben lassen). Es gibt Ähnlichkeiten zwischen den Halbraum-Amplituden an der Oberfläche, den Halbraum-Amplituden in der Tiefe und der Wellenausbreitung im Vollraum. Die berechneten Wellenfelder (als Terzspektren in verschie-denen Entfernungen von der Erschütterungsquelle) werden verwendet, um die gemessene Übertragungsfunktionen des Bodens zu approximieren und Erschütterungen von Zugvorbeifahrten zu prognostizieren. Auch dies wird an einigen Messorten vorgeführt. Dabei werden einige gemessene Besonderheiten der Eisenbahnerschütterungen mit dem geschichteten Aufbau des Bodens erklärt.
Der dritte Teil beschäftigt sich mit der Anwendung der Wellenfelder beziehungsweise der Punkt-lastlösungen beziehungsweise der Greenschen Funktionen in der Randelementmethode. Es wird ein einfaches Prinzip der Herleitung der Randelementmethode vorgeführt. Bei einer beliebigen Berandung benötigt man neben den Verschiebungswellenfeldern auch die Spannungswellen-felder. Eine einfache Berechnung der Spannungswellenfelder wird vorgeführt, die im Vollraum auf drei Spannungsfunktionen, ähnlich einfach wie die Verschiebungsfunktionen, führt. Durch die Kopplung der Randelementmethode mit der Finite-Element-Methode können dann Probleme der Bauwerk-Boden-Wechselwirkung gelöst werden.
Der vierte Teil beschäftigt sich schließlich mit der Freifeld-Wellenanregung unter einem Gebäude und der Wellenanregung im Gebäude. Dabei geht es um die Wechselwirkung der Freifeldwellen mit starren oder flexiblen Fundamenten (Pfählen, Fundamentplatten) und den Übertragungs-faktoren zwischen dem Freifeld und dem Gebäude. Bei der Wellenanregung in einem Büro-gebäude in Wien konnten die gleichen Methoden wie bei der Wellenanregung im Boden eingesetzt werden, Seismogramme, MASW, Übertragungsfunktionen und Amplituden-Abstandsgesetze.
The worldwide spread of windfarms brings new challenges, especially for concrete structures as a part of towers, connecting joints and foundations of wind turbines. High-cyclic loadings in such structures lead to a high relevance of the subject of fatigue. A proper assessment of the fatigue strength of concrete demands therefore a basis of reliable experimental data and the development of standardized testing methods. This article presents first results of an ongoing research program of BAM (Bundesanstalt für Materialforschung und -prüfung) which is a part of a joint project (WinConFat) funded by the German Federal Ministry for Economic Affairs and Energy. The subproject investigates the effects of size and slenderness of the specimens on the fatigue behaviour of high strength concrete at different stress levels. Not only the fatigue strength, but also the fatigue process itself is monitored by means of several measurement methods. Strain measurements are used to calculate the load dependent elastic modulus in the fatigue hysteresis as indicators for fatigue development. Furthermore, the application of non-destructive methods like acoustic emission analysis and ultrasonic measurement in laboratory tests gives a deeper insight into damage processes under cyclic loading. The results shall be used to improve design rules for concrete members under fatigue load and to develop or improve non-destructive techniques for in-service structural health monitoring.
The worldwide spread of windfarms brings new challenges, especially for concrete structures as a part of towers, connecting joints and foundations of wind turbines. High-cyclic loadings in such structures lead to a high relevance of the subject of fatigue. A proper assessment of the fatigue strength of concrete demands therefore a basis of reliable experimental data and the development of standardized testing methods. This article presents first results of an ongoing research program of BAM (Bundesanstalt für Materialforschung und -prüfung) which is a part of a joint project (WinConFat) funded by the German Federal Ministry for Economic Affairs and Energy. The subproject investigates the effects of size and slenderness of the specimens on the fatigue behaviour of high strength concrete at different stress levels. Not only the fatigue strength, but also the fatigue process itself is monitored by means of several measurement methods. Strain measurements are used to calculate the load dependent elastic modulus in the fatigue hysteresis as indicators for fatigue development. Furthermore, the application of non-destructive methods like acoustic emission analysis and ultrasonic measurement in laboratory tests gives a deeper insight into damage processes under cyclic loading. The results shall be used to improve design rules for concrete members under fatigue load and to develop or improve non-destructive techniques for in-service structural health monitoring.
Use of DEM-LBM modeling to prove the relevance of free jet model for soil erosion by impinging jet
(2018)
The aim of this study is to provide a micromechanical insight into the mechanisms taking place during the erosion of a cohesive granular material driven by a fluid flow, the objectives are summarized as follows:
Perform numerical erosion tests.
Parallelization of the code (Gpu).
Extensive parametric analysis => rely micro parameters (eg. Cohesion) to macro parameters (eg. Soil erodibility, mechanical strengths).
The erosion phenomena is the main cause of the most serious incidents observed on earthen hydraulic structures such as dams and dikes. Thus, there is a real need to explore in depth and understand the mechanisms at work in such complex erosional processes for preventing similar risks.
The aim of this study is to provide a micromechanical insight into the mechanisms taking place during the erosion of a cohesive granular material driven by a fluid flow, the objectives are summarized as follows:
Perform numerical erosion tests.
Parallelization of the code (Gpu).
Extensive parametric analysis => rely micro parameters (eg. Cohesion) to macro parameters (eg. Soil erodibility, mechanical strengths).
This talk provides a brief introduction on general engineering aspects of offshore wind energy production. Some geomechanical issues for the foundation of OWTs into the seabed are introduced, while the results from experimental investigations and coupled computational analysis are discussed.
In the second part of the seminar, the hydromechanical Wave–Tower interaction is firstly discussed. Then, some general aspects of the windfarm aerodynamics are introduced. On the one hand, some modelling possibilities for the wake analysis of single turbines and turbine groups are discussed. And on the other hand the relevance of such analyses for a proper windfarm layout optimization is pointed out.
Concerning the geomechanical issues the talk shows that: i) The pile’s bearing capacity can degrade under cyclic loading (waves, wind, …). ii) The time effects can be relevant: Capacity improvement can be substantial, but also fragile. iii) There are cyclic PWP effects: Cyclic interaction with pore water may lead to soil softening and an uncoupled analysis (current design practice) is potentially unsafe.
And concerning the hydromechanical and aerodynamical design considerations, this seminar shows that: i) Numerical analysis of turbine’s interaction with wind/waves is useful and affordable. ii) Simplified models can provide insight into windfarm aerodynamics. iii) Turbulent wake analysis is very relevant for the windfarm layout.
This presentation deals with the phenomenology and design of pile foundations for offshore wind turbines, and is divided in two lectures.
The first lecture presents a brief introduction to the context and peculiarities of such foundations, and then focuses on the particular case of axially loaded piles. This part is most relevant for the relatively slender piles of the multi-pile substructures (i.e. jackets and tripods). A clear distinction between physical phenomenology and practical design is drawn here.
The second lecture continues with the case of lateraly loaded offshore piles, which bears most relevance for the case of the monopile foundations. Here again, a clear separation between physical reality and design methods is intended.
Finally, the last part of the second lecture introduces several advanced topics which lie outside the classical design approaches, namely the cyclic pile fatigue and the so-called pile setup (i.e. the time effects on the axial pile capacity). The relevance of these two topics is illustrated with experimental results from a field testing campaign on real large-scale piles.
Superplasticizer and shrinkage reducing admixture dosages for microfine cement in grout systems
(2018)
Grouts have numerous applications including crack repair as maintenance in construction industries. Microfine cements are intensively used for high strength mortar and grout products. They are ideal for injection grouting in structural repair. Such grouts should have suitable rheological properties to be injectable, especially those used in repair and rehabilitation. The use of superplasticizers (SP) in these products is thus becoming increasingly crucial to achieve favorable workability and viscosity properties. A difficulty in such grouts is the plastic shrinkage due to finer particles used. It is thus necessary to determine optimum SP and shrinkage reducing admixture (SRA) dosages for a microfine cement based grout. In this study, a saturation dosage was decided from two Polycarboxylate ether (PCE) based SPs in relation to neat cement using slump flow and rheological parameters. A range of grout mixtures was formulated containing micro silica (MS) and fly ash (FA), and tested for suitable rheological and mechanical parameters. Based on the results, a grout mixture with MS and FA was selected to determine optimum SRA content. According to the results, a SP dosage of 3% by weight of neat cement is sufficient to achieve saturation. The grout material including MS and FA can produce comparable properties to neat cement grout. MS is found to improve compressive strength within the range considered, whereas a higher FA content provides favourable rheological properties. Finally, a SRA dosage of 4%, which could reduce the shrinkage by about 43% after 28d days, is determined for the grout system.