7.2 Ingenieurbau
Filtern
Erscheinungsjahr
- 2019 (65) (entfernen)
Dokumenttyp
- Vortrag (33)
- Beitrag zu einem Tagungsband (23)
- Zeitschriftenartikel (7)
- Buchkapitel (1)
- Posterpräsentation (1)
Schlagworte
- Fatigue (6)
- Grout (5)
- Impact (5)
- Temperature rejection (5)
- Train-induced ground vibration (5)
- Damage characterization (4)
- Damage localization (4)
- Ground vibration (4)
- Layered soils (4)
- Numeric simulation (4)
- Planar tomography (4)
- Reinforced concrete structure (4)
- Soil-structure interaction (4)
- Vehicle-track-soil interaction (4)
- Load vector (3)
- Model interpolation (3)
- Offshore foundations (3)
- Statistical evaluation (3)
- Statistical method (3)
- Subspace-based method (3)
- Vibration measurements (3)
- Wellengeschwindigkeit (3)
- Bahnerschütterungen (2)
- Bodenübertragungsfunktion (2)
- Bridges (2)
- Cable failure (2)
- Cable-stayed bridge (2)
- Compaction Grouting (2)
- Compressive Cyclic loading (2)
- Crack detection (2)
- Crack formation (2)
- Crack pattern (2)
- Cyclic load (2)
- Dispersionsmessung (2)
- Displacements (2)
- Drone (2)
- Excitation forces (2)
- Fly ash (2)
- Grouted connection (2)
- Hammer impact (2)
- High-strength concrete (2)
- Injection Sequence (2)
- Inspection planning (2)
- Interface (2)
- Long-term shrinkage (2)
- Metakaolin (2)
- Micro silica (2)
- Mitigation (2)
- Modal Analysis (2)
- Non destructive testing (2)
- Offshore Pile Foundation (2)
- Offshore wind turbines (2)
- Reliability (2)
- Risk (2)
- SDDLV (2)
- SHM (2)
- Slab track (2)
- Static load (2)
- Steel structures (2)
- Structural Health Monitoring (2)
- Structural health monitoring (2)
- Tensile Capacity (2)
- Train excitation (2)
- Train passage (2)
- Train speed (2)
- Ultrasonic testing (2)
- Uncertainty (2)
- Vibration (2)
- Wind Turbines (2)
- Zuggeschwindigkeit (2)
- Analytical Design Methods (1)
- Automated Modal Analysis for Tracking Structural Change during Construction and Operation Phases (1)
- BIM (1)
- Brücken (1)
- Climate Chamber (1)
- Components of excitation (1)
- Compressive strength (1)
- Concrete (1)
- Continuously inhomogeneous soils (1)
- DUCON® (1)
- Deckeneigenfrequenzen (1)
- Design methods (1)
- Ductility (1)
- E-modulus (1)
- EERA Joint Program (1)
- Earthen hydraulic infrastructures (1)
- Environmental Effects (1)
- Erneuerbare Energien (1)
- Erosion (1)
- Finite-element boundary-element method (1)
- Foundation Pile (1)
- GPU parallel computation (1)
- Gebäudemodelle (1)
- Gebäudeschwingungen (1)
- Ground vibration measurements (1)
- Horizontal stress (1)
- Inhomogeneous soils (1)
- Klimakammer (1)
- Measurement campaigns (1)
- Mechanical challenges (1)
- Messen im Bauwesen (1)
- Micro-reinforcement (1)
- Microfine Cement (1)
- Micromechanical analysis (1)
- Micromechanical modelling (1)
- Mobile elements (1)
- Multi-beam method (1)
- Numerical modeling (1)
- Numerical modelling (1)
- Offshore (1)
- Offshore geotechnics (1)
- Offshore steel structures (1)
- Offshore wind energy (1)
- Offshore wind energy foundations (1)
- Physical phenomenology (1)
- Physical testing (1)
- Pile bending stiffness (1)
- Pile foundation (1)
- Pile foundations (1)
- Prediction (1)
- Quasi-static and dynamic tests (1)
- SHM Environmental (1)
- SHM environmental bridges (1)
- Scattered axle impulses (1)
- Shrinkage Reducing Admixture (1)
- Soft track elements (1)
- Soil stiffness (1)
- Soil-water-structure interaction (1)
- Spektralanalyse (1)
- Stability Buckling soil-structure-interaction piles offshore (1)
- Stereo photogrammetry (1)
- Superplasticizer (1)
- Supplementary Cementitious Materials (1)
- Tagung (1)
- Temperature effect rejection (1)
- Temperature effects (1)
- Temperature modeling (1)
- Temperatureinflüsse (1)
- Track beam (1)
- UHPC (1)
- Un- certainty (1)
- Vehicle-track interaction (1)
- Wavenumber integrals (1)
- Wavenumber method (1)
- Wellenausbreitung (1)
- Wheelset accelerations (1)
- Wind energy (1)
- Wind energy tower (1)
- Windenergie (1)
- elastische Gebäudelagerungen (1)
- risk, reliability, inspection planning, offshore wind turbines (1)
Organisationseinheit der BAM
- 7.2 Ingenieurbau (65) (entfernen)
Eingeladener Vortrag
- nein (33)
Two 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 present contribution evaluates four measuring series made by the Federal Institute of Material Research and Testing for the relations between train speed and ground vibration amplitudes. This experimental evaluation is supported by the simulation of the train passages at the different sites by using appropriate excitation mechanisms and forces as well as layered soil models which have been derived from impact measurements at each site.
The present contribution evaluates four measuring series made by the Federal Institute of Material Research and Testing for the relations between train speed and ground vibration amplitudes. This experimental evaluation is supported by the simulation of the train passages at the different sites by using appropriate excitation mechanisms and forces as well as layered soil models which have been derived from impact measurements at each site.
Due to the many possible applications, the uncomplicated production and the high application range, reinforced concrete is a widely used building material. This large range of physical material properties still poses an engineering challenge in determining all necessary requirements for predicting dynamic effects under impact load.
Many aspects of impact have already been examined and some correlations have been studied intensively. Examples are the work of Lastunen and Booker, who studied the influence of projectile properties on the impact form. Li has also investigated the local effects of an impact. The field of detailed damage analysis has not been in focus so far.
This presentation shows some studies in medium-velocity impact with the focus on post-impact damage evaluation. The impactor is modified so that the test plates show low penetration on the top and scabbing on the bottom. With the unique tomography lab test stand at BAM the plate is scanned after the impact and the damage is analyzed. Cracks and scabbing are made visible with a reconstruction. The comparison of simulation and tomography allows to create prognosis models for damage characterization.
The structural performance of many geotechnical systems (e.g. axially-loaded pile foundations), depends on the shearing resistance at the soil interface, which may govern the load bearing capacity of the foundation. Experimental investigations have shown that this interaction is mainly localised within a narrow shear band next to the structure. Under cyclic loading, a contraction of the soil at the interface may arise (net volume loss), possibly leading to a stress relaxation and thus to a reduction of the load bearing capacity (the so-called friction fatigue). Based on the constitutive similarities between soil continua and interfaces, we propose here the adaption of a Generalized Plasticity model for sandy soils for the numerical analysis of interface problems. In this contribution, the results of an experimental campaign for the parameter calibration of the constitutive model are presented. The tests have been conducted with a ring shear device involving different normal stresses, roughness of the steel plates as well as cyclic loading. The new modelling approach shows promising results and has the additional practical advantage that the interface zone and the soil continuum can both be described with the same constitutive model in general boundary value problems.
The structural performance of many geotechnical systems (e.g. axially-loaded pile foundations), depends on the shearing resistance at the soil interface, which may govern the load bearing capacity of the foundation. Experimental investigations have shown that this interaction is mainly localised within a narrow shear band next to the structure. Under cyclic loading, a contraction of the soil at the interface may arise (net volume loss), possibly leading to a stress relaxation and thus to a reduction of the load bearing capacity (the so-called friction fatigue). Based on the constitutive similarities between soil continua and interfaces, we propose here the adaption of a Generalized Plasticity model for sandy soils for the numerical analysis of interface problems. In this contribution, the results of an experimental campaign for the parameter calibration of the constitutive model are presented. The tests have been conducted with a ring shear device involving different normal stresses, roughness of the steel plates as well as cyclic loading. The new modelling approach shows promising results and has the additional practical advantage that the interface zone and the soil continuum can both be described with the same constitutive model in general boundary value problems.
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.
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.