7.2 Ingenieurbau
Filtern
Dokumenttyp
- Beitrag zu einem Tagungsband (67) (entfernen)
Sprache
- Englisch (52)
- Deutsch (14)
- Mehrsprachig (1)
Referierte Publikation
- nein (67) (entfernen)
Schlagworte
- Ground vibration (5)
- Structural health monitoring (5)
- Fatigue (4)
- Structural Health Monitoring (4)
- Building vibration (3)
- Damage localization (3)
- Hammer impact (3)
- Impact (3)
- Layered soil (3)
- Vibration measurements (3)
- Bahnerschütterungen (2)
- Bayesian updating (2)
- Cable failure (2)
- Cable-stayed bridge (2)
- Container loading (2)
- Damage characterization (2)
- Drop test (2)
- Erschütterungen (2)
- Foundation load (2)
- High-strength concrete (2)
- Load vector (2)
- Model interpolation (2)
- Monitoring (2)
- Offshore (2)
- Planar tomography (2)
- Repair (2)
- SDDLV (2)
- Soil-wall-floor model (2)
- Statistical evaluation (2)
- Temperature rejection (2)
- Train passage (2)
- Train-induced ground vibration (2)
- Ultrasonic testing (2)
- Vehicle-track interaction (2)
- Vibration (2)
- 2-span bridge (1)
- Acoustic emission testing (1)
- Amplitude-charge weight laws (1)
- Amplitude-distance laws (1)
- Analysis of variance (1)
- Analytical Design Methods (1)
- Ansys Autodyn (1)
- Apartment building (1)
- Artificial intelligence (1)
- Attenuation (1)
- Axle loads (1)
- Axle-sequence spectrum (1)
- BIM (1)
- Bayesian System Identification (1)
- Bayesian methods (1)
- Belastungsversuch (1)
- Big Data (1)
- Bodenvariabilität (1)
- Bodenübertragungsfunktion (1)
- Box-Behnken (1)
- Bridges (1)
- Brücke (1)
- Changing process noise (1)
- Chemisoprtion (1)
- Climate chamber (1)
- Column/wall resonance (1)
- Compaction Grouting (1)
- Compressive Cyclic loading (1)
- Compressive cyclic loading (1)
- Compressive strength (1)
- Conductor (1)
- Coupler systems (1)
- Crack detection (1)
- Crack formation (1)
- Crack growth (1)
- Crack pattern (1)
- Cracks (1)
- Cyclic load (1)
- DEM (1)
- DUCON® (1)
- Damage detection (1)
- Datenmanagement (1)
- Deterioration (1)
- Digital Models (1)
- Digital twin (1)
- Dispersionsmessung (1)
- Displacements (1)
- Drone (1)
- Drop Tests (1)
- Drop tower (1)
- Drucker-Prager (1)
- Ductility (1)
- Dynamische Bodensteifigkeit (1)
- E-modulus (1)
- Earth (1)
- Earth masonry (1)
- Elastische Gleiselemente (1)
- Emission (1)
- Energy (1)
- Environmental effects (1)
- Erschütterungsausbreitung (1)
- Erschütterungsminderung (1)
- Erschütterungsprognose (1)
- Evaluation (1)
- Excitation forces (1)
- Explosion-induced ground vibrations (1)
- Fallturm (1)
- Faseroptik (1)
- Fault detection (1)
- Feuchte (1)
- Filter effects (1)
- Finite Elemente Simulation (1)
- Finite element models (1)
- Floor resonance (1)
- Foundation Pile (1)
- Foundation reliability analysis (1)
- Freight train (1)
- Freileitung (1)
- Gleiströge (1)
- Granular Cohesive Materials (1)
- Ground vibration measurements (1)
- Grout (1)
- Grouted Connection (1)
- Grouted connection (1)
- Grouting (1)
- Großer Fallturm Horstwalde (1)
- HTLS (1)
- Halbraum (1)
- Hard impact (1)
- Harter Anprall an Stahlbetonstrukturen (1)
- High-Rise Building (1)
- High-speed (1)
- High-speed train (1)
- Horizontal stress (1)
- Immission (1)
- Impact damage on reinforced concrete (1)
- Impakt (1)
- Inertial Interaction (1)
- Injection Sequence (1)
- Inspection (1)
- Inspection planning (1)
- Interface (1)
- Irregularities (1)
- Kinematic Interaction (1)
- Knudsen effect (1)
- Laboratory beam structure (1)
- Layered soils (1)
- Lehm (1)
- Linear parameter varying systems (1)
- Load-bearing (1)
- Long-span bridge (1)
- Macromechanical Sample Strength (1)
- Maschinenbetrieb (1)
- Material moisture (1)
- Material tests (1)
- Mauerwerk (1)
- Measurement (1)
- Measurements (1)
- Micro-reinforcement (1)
- Micromechanical Tensile Failure (1)
- Minderungsmaßnahmen (1)
- Mobile elements (1)
- Modal Analysis (1)
- Modal force spectrum (1)
- Modalanalyse (1)
- Modes (1)
- Moisture (1)
- Molecular diffusion (1)
- Monopile installation risks (1)
- Multiple impact (1)
- NDT (1)
- Nachgiebigkeiten (1)
- Non destructive testing (1)
- Non-destructive testing (1)
- Numeric simulation (1)
- Numerical damage simulation (1)
- Numerical modeling (1)
- Numerical modelling (1)
- Office building (1)
- Office tower (1)
- Offshore Pile Foundation (1)
- Offshore Wind Energy (1)
- Offshore foundations (1)
- Offshore wind energy (1)
- Offshore wind turbines (1)
- Optimal Sensor Placement (1)
- Passenger train (1)
- Physisorption (1)
- Pile Foundation (1)
- Post-impact evaluation (1)
- Prediction of explosion induced ground and building vibration (1)
- Probabilistic modelling (1)
- Propagation from a tunnel (1)
- Prädiktive Instandhaltung (1)
- Quasi-static and dynamic tests (1)
- Radar (1)
- Railway bridge (1)
- Railway tunnel (1)
- Randomly heterogeneous soil (1)
- Rehabilitation (1)
- Reinforced concrete structure (1)
- Reinforcement (1)
- Reliability (1)
- Research data management (1)
- Residential building (1)
- Risk (1)
- Scattering (1)
- Scherwellengeschwindigkeit (1)
- Schubmodul (1)
- Schwingungsdynamik (1)
- Shearing (1)
- Shell Buckling (1)
- Simple prediction (1)
- Size effect (1)
- Slab track (1)
- Slenderness effect (1)
- Soft impact (1)
- Soil properties (1)
- Soil-Structure-Interaction (1)
- Soil-building interaction (1)
- Soil-building resonance (1)
- Soil-pile interaction (1)
- Soil-structure interaction (1)
- Spatially varying ground conditions (1)
- Static load (1)
- Statistische Auswertung (1)
- Steel structures (1)
- Stereo photogrammetry (1)
- Strength (1)
- Structural systems (1)
- Subspace methods (1)
- Subspace-based residual (1)
- Supplementary cementitious materials (1)
- Surface Foundation (1)
- Surface-tunnel reduction (1)
- System Identification (1)
- Temperature effects (1)
- Tensile Capacity (1)
- Time-variant reliability (1)
- Tomographic damage evaluation (1)
- Tragfähigkeit (1)
- Train speed (1)
- Transfer function (1)
- Transmission (1)
- Tunnel (1)
- Tunnel-pile transfer (1)
- UHPC (1)
- Umwelteinflüsse (1)
- Value of Information (1)
- Varying stiffness (1)
- Vehicle-track-soil interaction (1)
- Vibration measurement (1)
- Vollraum (1)
- Waves (1)
- Welded (1)
- Wellenausbreitung (1)
- Wellenausbreitung in der Tiefe (1)
- Wellengeschwindigkeit (1)
- Wind (1)
- Wind Energy (1)
- Wind Turbines (1)
- Windenergie (1)
- Windenergieanlagen (1)
- Zerstreute Achsimpulse (1)
- Zuggeschwindigkeit (1)
- building information modelling (1)
- structural health monitoring (1)
- structural integrity management (1)
- support structures (1)
Organisationseinheit der BAM
- 7 Bauwerkssicherheit (67) (entfernen)
The Stochastic Dynamic Damage Locating Vector (SDDLV) approach is a vibration-based damage localization method based on both a finite element model of a structure and modal parameters estimated
from output-only measurements in the damage and reference states. A statistical version of the Approach takes into account the inherent uncertainty due to noisy measurement data. In this paper, the effect of temperature fluctuations on the performance of the method is analyzed in a model-based approach using a finite element model with temperature dependent parameters. Robust damage localization is carried out by rejecting the temperature influence on the identified modal parameters in the damaged state. The algorithm is illustrated on a simulated structure.
The Stochastic Dynamic Damage Locating Vector (SDDLV) approach is a vibration-based damage localization method based on both a finite element model of a structure and modal parameters estimated from output-only measurements in the damage and reference states. A statistical version of the Approach takes into account the inherent uncertainty due to noisy measurement data. In this paper, the effect of temperature fluctuations on the performance of the method is analyzed in a model-based approach using a finite element model with temperature dependent parameters. Robust damage localization is carried out by rejecting the temperature influence on the identified modal parameters in the damaged state. The algorithm is illustrated on a simulated structure.
The subject of damage localization is an important issue for Structural Health Monitoring (SHM) particularly in mechanical or civil structures under ambient excitation. In this paper, the statistical subspacebased damage localization method has been applied on a benchmark application, namely a 1/200 scale model of the Saint-Nazaire Bridge, which is a cable-stayed bridge located on the Loire River near the river’s mouth. The employed damage localization method combines data-driven features with physical parameter information from a finite element model in statistical tests, avoiding typical ill-conditioning problems of FE model updating. Damage is introduced in the mockup for cable failures on some of the 72 cables. The purpose of the experiment is to assess the capability of damage assessment methods to find a cable failure.
The subject of damage localization is an important issue for Structural Health Monitoring (SHM) particularly in mechanical or civil structures under ambient excitation. In this paper, the statistical subspacebased damage localization method has been applied on a benchmark application, namely a 1/200 scale model of the Saint-Nazaire Bridge, which is a cable-stayed bridge located on the Loire River near the river’s mouth. The employed damage localization method combines data-driven features with physical parameter information from a finite element model in statistical tests, avoiding typical ill-conditioning problems of FE model updating. Damage is introduced in the mockup for cable failures on some of the 72 cables. The purpose of the experiment is to assess the capability of damage assessment methods to find a cable failure.
Monopiles are currently the predominant foundation type for offshore wind turbines in Europe. Due to the increasing dimensions of the turbines, pile diameters beyond 10m become necessary. A design-relevant failure mode of monopiles is the local buckling of the pile wall in the embedded sections. Relevant buckling guidelines do not consider the soil-structure interaction specifically, although the embedment may allow for a reduction of wall thickness. However, Eurocode-based design concepts require a validation with comparative buckling cases for validation, either in terms of buckling curve parameters for both the algebraic stress-based and semi-numerical LBA/MNA design concept or as a calibration factor kGMNIA for fully numerical GMNIA calculations. These parameters are not yet available for embedded shells. To close this gap, we have conducted experiments on piles embedded in sand to investigate local buckling under soil-structure-interaction. The results will be used to calibrate numerical models. This research was carried out as part of the VERBATIM research project, funded by PTJ/BMWK and supported by the Carbon Trust's Offshore Wind Accelerator consortium.
Falltürme sind Bauwerke, die als Versuchsanlagen sehr speziellen, impulsartigen Belastungen ausgesetzt sind. Am Fallturm auf dem Testgelände Technische Sicherheit (TTS) der BAM wurde bei Routineinspektionen eine Abnahme der strukturellen Integrität in Form von Vorspannungsverlusten in den Bolzen der Stahlverbindungen festgestellt. Um ein Verständnis für die zugrundeliegenden Trag- und Schädigungsmechanismen zu erlangen, wurde ein umfassendes Structural Health Monitoring (SHM) System geplant und am Bauwerk installiert unter Nutzung von digitalen Bauwerksmodellen. Für die Auslegung des Überwachungssystems, insbesondere aber zur Unterstützung der Untersuchung des Schädigungsprozesses, wurden Finite-Elemente-Modelle erstellt. Um sicherzustellen, dass die FE-Modelle das reale Tragwerksverhalten mit ausreichender Genauigkeit abbilden, mussten sie jedoch in Bezug auf die gemessenen Antworten des Tragwerks kalibriert werden. Der vorliegende Beitrag beschreibt experimentelle und numerische Untersuchungen zur Identifizierung des strukturellen Systems des Stahlrohrgitterturms in Vorbereitung einer Überwachungskampagne. Die Auswertung von gemessenen Schwingungen unter ambienter Anregung ermöglichte die Identifizierung der Eigenfrequenzen mehrerer globaler Schwingungsmoden des Fallturms. Zur Modellvalidierung wurde zunächst eine Sensitivitätsanalyse durchgeführt, um die Parameter mit dem größten Einfluss zu ermitteln. Anschließend wurde ein evolutionärer Algorithmus (EA) zur Optimierung nach dem Prinzip der Minimierung der Differenzen zwischen gemessenen und simulierten charakteristischen Antworten eingesetzt. Das aktualisierte Modell wurde schließlich an der dynamischen Reaktion der Turmstruktur infolge einer realen Falltest-induzierten Stoßbelastung validiert. Die Ergebnisse zeigten eine gute Übereinstimmung zwischen numerischen und experimentellen Ergebnissen.
A study on building vibrations has been performed by finite element calculations. Family houses, multi-storey residential buildings, office buildings and office towers have been modelled in detail. The frequency-dependent response due to a free-field excitation has been evaluated for walls, columns and floors. The ratio of building amplitudes to free-field amplitudes starts with uB/u0 = 1 at zero frequency and is usually lower than 1 at 50 Hz, the end of the frequency range considered here. In between, amplifications occur due to several reasons. There are „soil resonances“ where the whole building is vibrating on the compliant soil, “column resonances” where the upper storeys are vibrating on the compliant columns, and the “floor resonances” where the floors are vibrating excited by their supports. Results are presented for all building types, but a special focus is set on office buildings. A parameter study shows the influence of the stiffness of the soil, the number of storeys, and the width of the building. It has been found that the “soil resonance” is strongly modified by the low-frequency floor resonances for the normal office building. The main resonance of a twenty-storey office tower is determined equally by the “soil mode” and the “column mode”. It is an important observation for these office buildings that the resonances can differ for different parts of the building such as the centre, the edge, the corner, and the core of the building. This leads to non-uniform vibration modes across the building, which look like another type of “floor resonance” and which have been observed in several real building projects. Experimental results will be shown which can confirm the calculated phenomena.
Vibration measurements have many causes and many technical and natural sources. Problems can sometimes be solved by short-term measurements, but in many cases, a long-term measurement is necessary. In long-term measurements of days, weeks, months and even years, it is easy to collect a huge quantity of raw data, but at the end, the post-processing of these data can be exhausting (for example one-year vibration data of a wind energy tower). A software has been developed which con-sists of measuring and evaluation routines where the measuring routines can operate different meas-uring systems and different measuring cards. The main advantage of this software is the fact that the interesting evaluations can be integrated in the measuring process so that the characteristics of the vibration can be extracted without storing all the raw data. Only important time segments are stored, for example train passages. The overall concept of the software and the main evaluation routines will be described in some details. Examples of our measurement experience will illustrate the capabilities of the software. 1) Surveying construction work in nearby sensitive buildings (for example an old wind tunnel), including a stable alarm system and meaningful vibration limits. 2) Prediction of train-induced vibration for a planned building to prevent annoyance and to improve the building design. 3) Modal analysis and long term measurements of several single- or multi-span, concrete or steel bridges 4) Modal and wave analysis of coupled floors in a historical building (“Neues Palais” at Potsdam). 5) Soil properties of various measurement sites (different routines to evaluate the dispersion). Moreover, from many projects, amplitudes, frequencies, and attenuation laws have been collected and analysed for the different sources such as vibratory or impact pile driving and ground compaction, demolition work with different machines, blasting in quarries and in tunnel works, bomb and mine clearing.
Measured train passages and hammer impacts in combination with track-soil calculation have been successfully used for the detection of damaged slab tracks. This approach is now extended to intact slab and ballast tracks. The vibrations of many tracks have been measured at several levels from rail, sleeper, track plate, base plate, base layer to the subsoil by velocity or acceleration sensors. The time histories have to be integrated once or twice to get the displacements. The displacement signals include an arbitrary time-dependent shift which must be eliminated or respected in the interpretation. On the other hand, the calculation of slab and ballast tracks have been done in frequency-wavenumber domain. The displacements along the track and the frequency-dependent compliance transfer functions can be calculated. The latter can be compared with the results of the hammer impacts on the track. The deformation of the track can be transformed to time histories for a whole train and compared to the measured train passages. Many slab (and ballast) tracks have been measured at different sites. The displacements of the tracks are presented, and the following parameters have been analysed in the measurement results: slab track vs. ballast track, different types of slab tracks, damaged slab tracks, different trains, switches at different measuring points, an elastic layer, the mortar layer, different soils at different places. The soil should have the dominant influence on the track-plate displacements. Slab and ballast track yield also big differences in maximum displacement and width of deformation. Some of the preceding aspects will be analysed in comparison of measurement and theory.
The attenuation of wave amplitudes is ruled by the planar, cylindrical or spherical geometry of the wave front (the geometric or power-law attenuation) but also by the damping of the soil (an exponential attenuation). Several low- and high-frequency filter effects are derived for the layering and the damping of the soil, for the moving static and the distributed train loads and for a homogeneous or randomly heterogeneous soil. Measurements of hammer- and train-induced vibrations at five sites have been analysed for these attenuation and filter effects. The measured attenuation with distance can be discribed by generalised power laws and some reasons will be discussed. The theoretical filter effects can well be found in the measurements.