7.2 Ingenieurbau
Filtern
Dokumenttyp
- Beitrag zu einem Tagungsband (66) (entfernen)
Sprache
- Englisch (66) (entfernen)
Schlagworte
- Ground vibration (6)
- Structural health monitoring (6)
- Fatigue (5)
- Model interpolation (4)
- Vibration measurements (4)
- Building vibration (3)
- Damage localization (3)
- Hammer impact (3)
- Impact (3)
- Layered soil (3)
- Reliability (3)
- Structural Health Monitoring (3)
- Temperature rejection (3)
- Bayesian updating (2)
- Cable failure (2)
- Cable-stayed bridge (2)
- Container loading (2)
- Damage characterization (2)
- Drop test (2)
- Environmental effects (2)
- Fault detection (2)
- Foundation load (2)
- Grout (2)
- High-strength concrete (2)
- Inspection planning (2)
- Interface (2)
- Linear parameter varying systems (2)
- Load vector (2)
- Offshore (2)
- Planar tomography (2)
- Repair (2)
- Risk (2)
- SDDLV (2)
- Soil-structure interaction (2)
- Soil-wall-floor model (2)
- Statistical evaluation (2)
- Structural systems (2)
- Subspace-based method (2)
- Subspace-based residual (2)
- Train passage (2)
- Train-induced ground vibration (2)
- Ultrasonic testing (2)
- Vehicle-track interaction (2)
- Wind (2)
- 2-span bridge (1)
- Achsfolgespektren (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)
- Artificial intelligence (1)
- Attenuation (1)
- Autonomous underwater vehicles (1)
- Axle impulses (1)
- Axle loads (1)
- Axle-sequence spectrum (1)
- BIM (1)
- Bauteile (1)
- Bauwerke (1)
- Bayesian System Identification (1)
- Bayesian methods (1)
- Bayesian system identification (1)
- Box-Behnken (1)
- Bridges (1)
- Brücken (1)
- Changing process noise (1)
- Chemisoprtion (1)
- Climate chamber (1)
- Column/wall resonance (1)
- Compaction Grouting (1)
- Compaction grouting (1)
- Compressive Cyclic loading (1)
- Compressive cyclic loading (1)
- Compressive strength (1)
- Computer Vision (1)
- Conductor (1)
- Coupler systems (1)
- Crack Luminescence (1)
- Crack detection (1)
- Crack formation (1)
- Crack growth (1)
- Crack pattern (1)
- Cracks (1)
- Cyber security (1)
- Cyclic load (1)
- DEM (1)
- DUCON® (1)
- Damage detection (1)
- Damage identification (1)
- Deterioration (1)
- Digital Image Correlation (DIC) (1)
- Digital Models (1)
- Digital twin (1)
- Displacements (1)
- Drone (1)
- Drop Tests (1)
- Drop tower (1)
- Drucker-Prager (1)
- Ductility (1)
- E-modulus (1)
- Earth masonry (1)
- Energy (1)
- Environmental changes (1)
- Evaluation (1)
- Excitation forces (1)
- Explosion-induced ground vibrations (1)
- Fault detectionchanging (1)
- Filter effects (1)
- Finite element models (1)
- Floor resonance (1)
- Foundation Pile (1)
- Foundation reliability analysis (1)
- Freight train (1)
- Freileitung (1)
- Granular Cohesive Materials (1)
- Ground vibration measurements (1)
- Grouted Connection (1)
- Grouted connection (1)
- Grouting (1)
- HAZID (1)
- HTLS (1)
- Hard impact (1)
- High-Rise Building (1)
- High-speed (1)
- High-speed train (1)
- Horizontal stress (1)
- Impact damage on reinforced concrete (1)
- Inertial Interaction (1)
- Injection Sequence (1)
- Inspection (1)
- Irregular ballast (1)
- Irregular soil (1)
- Irregularities (1)
- Kinematic Interaction (1)
- Knudsen effect (1)
- Laboratory beam structure (1)
- Layered soils (1)
- Long-span bridge (1)
- Macromechanical Sample Strength (1)
- Material Point Method (MPM) (1)
- Material moisture (1)
- Material tests (1)
- Measurement (1)
- Measurements (1)
- Micro-reinforcement (1)
- Microfine Cement (1)
- Micromechanical Tensile Failure (1)
- Mixed formulation (1)
- Mobile elements (1)
- Modal Analysis (1)
- Modal force spectrum (1)
- Modalanalyse (1)
- Modes (1)
- Molecular diffusion (1)
- Monitoring (1)
- Monopile installation risks (1)
- Multiple impact (1)
- NDT (1)
- Non destructive testing (1)
- Non-Destructive Evaluation (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 pile foundation (1)
- Offshore steel structures (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)
- Probability of Detection (1)
- Process noise (1)
- Propagation from a tunnel (1)
- Quasi-static and dynamic tests (1)
- Railway (1)
- Railway bridge (1)
- Railway tunnel (1)
- Randomly heterogeneous soil (1)
- Rehabilitation (1)
- Reinforced concrete structure (1)
- Reinforcement (1)
- Research data management (1)
- Residential building (1)
- Residual evaluation (1)
- Risk-based design (1)
- SHM (1)
- SHM environmental bridges (1)
- Safety (1)
- Scattering (1)
- Shearing (1)
- Shell Buckling (1)
- Shrinkage Reducing Admixture (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)
- Spatially varying ground conditions (1)
- Static load (1)
- Statistical method (1)
- Statistical tests (1)
- Steel structures (1)
- Stereo photogrammetry (1)
- Subspace methods (1)
- Superplasticizer (1)
- Supplementary Cementitious Materials (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)
- Train speed (1)
- Transfer function (1)
- Tunnel-pile transfer (1)
- UHPC (1)
- Uncertainty (1)
- Uncertainty in reference (1)
- Value of Information (1)
- Varying stiffness (1)
- Vehicle-track-soil interaction (1)
- Vibration (1)
- Vibration measurement (1)
- Waves (1)
- Welded (1)
- Wind Energy (1)
- Wind Turbines (1)
- temperature (1)
Organisationseinheit der BAM
- 7.2 Ingenieurbau (66) (entfernen)
Three measurement campaigns of train-induced ground vibrations are evaluated for the vehicle-track-soil interaction. Ground vibrations, track vibrations and vehicle vibrations have been measured for train passages and impulse excitation and compared with theoretical results. The soil and the track-soil system are calculated by wavenumber integrals. The influence of the vehicle is introduced by a substructure method. By comparing theory and measurement the different components of excitation force and ground vibration can be analysed, the quasi-static excitation, track-alignment errors, the out-of-roundness of wheels, the wheel and rail roughness, and moreover, scattered axle impulses and ineffective high-frequency parts of the wheelset accelerations and forces.
Abstract. Three measurement campaigns of train-induced ground vibrations are evaluated for the vehicle-track-soil interaction. Ground vibrations, track vibrations and vehicle vibrations have been measured for train passages and impulse excitation and compared with theoretical results.
The soil and the track-soil system are calculated by wavenumber integrals. The influence of the vehicle is introduced by a substructure method. By comparing theory and measurement the different components of excitation force and ground vibration can be analysed, the quasi-static excitation, track-alignment errors, the out-of-roundness of wheels, the wheel and rail roughness, and moreover, scattered axle impulses and ineffective high-frequency parts of the wheelset accelerations and forces.
The identification of the dynamic behavior of structures, like bridges and towers, is relevant to address multiple issues. In many cases the dynamic parameters should be acquired only once or at a frequency that doesn’t justify the installation of distinct vibration sensors for a long-term monitoring. To identify modal frequencies of a structure, a drone based mobile sensing platform has been implemented. This sensing platform measures the relative displacement be-tween the structure and the drone, which also shows a strong dynamic behavior under wind tur-bulences. By regarding the dynamic model of the drone and additional measurements at the dis-tance sensor the absolute movement of the structure can be estimated based on the measured relative distance. This time domain data is a suitable input for various operational modal analysis algorithms. The system has been used to identify the dynamic properties of test and real structure, like a 1.5 MW wind turbine tower.
Inspection and maintenance contribute significantly to the lifetime cost of bridges. There is significant potential in using information obtained through structural health monitoring to update predictive models of the condition and performance of such structures, and thus ena-ble an improved decision-making regarding inspection and maintenance activities. Within the AISTEC project funded by the German Federal Ministry of Education and Research, we develop vibration-based structural health monitoring systems aimed at continuously provid-ing information on the structural condition of bridges. Environmental variations such as changing ambient temperatures can significantly influence the dynamic characteristics of bridges and thus mask the effect of structural changes and damages. It remains a challenge to account for such influences in structural health monitoring. To study the effect of ambient temperatures on the dynamic characteristics of beam structures, we monitor the vibration response of a reinforced concrete beam in the uncracked and cracked state at varying tem-peratures in a climate chamber. We postulate a set of competing parameterized probabilistic structural models, which explicitly account for the effect of varying ambient temperatures on the mechanical properties of the system. We then combine the information provided by the structural models with the information contained in the recorded vibration data to learn the parameters of the temperature-dependent structural models and infer the plausible state of the beam using Bayesian system identification and model class selection.
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.
Grouting is a universal repair and strengthening technique, which is constantly used for structural remediation of concrete components, trenches, mine subsidence, dam joints, restoration of masonry structures, and geological stabilizations. Having an extremely small particle size of only few microns, ultrafine cements are ideal for grouting applications due to their superior permeability and compressive strength properties of the hardened cement paste compared to that of the less-expensive, but coarser ordinary Portland cements. Supplementary cementitious materials (SCMs) are often used to replace ultrafine cement in order to modify certain properties and to reduce costs. The aim of this experimental study is to investigate the effect of three supplementary materials: microsilica (MS), fly ash (FA), and metakaolin (MK) on the workability, and mechanical properties of an ultrafine cement based grout with a constant water-binder ratio and constant superplasticizer content. Maximum percentages of replacement with ultrafine cement were 6% by volume of cement for MS and 16% for FA, and MK. In general, results suggest that the workability is improved by addition of FA, whereas is reduced, when modified with MS and MK. The compressive strength of grout after cement replacement remains comparable to that of pure cement grout. However, there is a tendency of the MS to positively affect the compressive strength opposite to FA, whereas flexural strength is positively affected by FA. Based on the results, it is evident that grouts with Hägerman cone flow more than 500 mm and compressive strength of more than 90 MPa after 28 days can be produced.