https://research-information.bris.ac.uk/files/181445095/ENGSTRUCT_D_16_00971R2.pdf

Soil-structure interaction effects in analysis of seismic fragility of bridges using an intensity-based ground motion selection procedure

/pdf/seismic-vulnerability-assessment-of-wharf-structures-51pu1tr6ph.pdf

Seismic vulnerability assessment of wharf structures

Evaluation of Base Isolation and Soil Structure Interaction Effects on Seismic Response of Bridges. (August 2005) Wentao Dai, B. En., Tongji University, China; M.S., Tongji University, China Chair of Advisory Committee: Dr. Jose M. Roësset A continuous formulation to calculate the dynamic stiffness matrix of structural members with distributed masses is presented in detail and verified with some simple examples. The dynamic model of a specific bridge (the Marga-Marga bridge in Chile) was developed using this formulation, and the model was then used to obtain the transfer functions of the motions at different points of the bridge due to seismic excitation. The model included rubber pads, used for base isolation, as additional members. The transfer functions were obtained with and without rubber pads to investigate their effect. The dynamic stiffness of complete pile foundations was calculated by a semi-analytical solution with Poulos’ assumption. General observations on group effects under various conditions were obtained from the result of these studies. The dynamic stiffness of the pile foundations for the Marga-Marga bridge was then obtained and used to study the soil structure interaction effects on the seismic response of the bridge. Records obtained during a real earthquake were examined and interpreted in light of the results from all these analyses. Finally, conclusions and recommendations on future studies are presented.

Evaluation of base isolation and soil structure interaction effects on the seismic response of bridges

The complex seismic soil-pile-structure interaction phenomenon is related to the interaction between foundation and structure under seismic and dynamic excitations. An ef- fective way to assess such phenomenon is to analyse the response of scaled physical model in 1-g or n-g devices. In this study some results selected from a comprehensive 1-g shaking table tests are reported and discussed. The extensive experimental campaign was carried out on the 3mx3m shaking table of the Bristol Laboratory for Advanced Dynamics Engineering (BLADE) at the University of Bristol (UK), within the framework of the Seismic Engineering Research Infrastructures for European Synergies (SERIES). The physical model comprises a pile group embedded in a by-layer soil deposit with different pile configurations. This paper focuses on the pile group response generated by the presence of a cantilever system (a single-degree-of- freedom, SDOF) connected at the top of the central pile considering no connection among the other pile heads. The selected input motions consist of a set of sinedwell excitations for SDOFs with different structural masses. The experimental data are used to validate an ad- vanced 2D difference element model using the FLAC2D code. The comparisons between the experimental and the numerical results are presented in terms of both envelope and time his- tories for the free-field and piles responses. The SDOF response is also assessed in terms of displacement time histories. Comparisons between the numerical and experimental test re- sults appear satisfactory; hence numerical approach can be used for further simulations of the soil-pile-structure interaction phenomena.

/pdf/soil-pile-structure-interaction-experimental-results-and-4bs0qd9x1d.pdf

L. A. Wood

Papers

9. Soil-structure interaction in design