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To elucidate whether an irregular topography affects the seismic response of nearby structures, an analytical solution to the dynamic interaction between a symmetric V‐shaped canyon and an adjacent building under the incidence of SH waves is proposed by using the wave function expansion method. The dynamic canyon‐soil‐structure interaction is decomposed into two problems of scattering and radiation. The building is idealized as a shear wall supported by a semicircular rigid foundation. The analytical solution can be degenerated theoretically to the canonical model of a shear wall embedded in a half‐space for either a zero depth‐to‐width ratio of the canyon or an infinite canyon‐building distance. Through a numerical comparison with two past exact solutions to the sole shear wall model as well as the sole V‐shaped canyon model, the correctness of the method in this paper is verified. A systematic parametrical analysis in both frequency and time domains is performed. It is found that the seismic response of the building may be amplified when it is on the wave‐facing side of the canyon. The degree of amplification is closely related to the size and depth‐to‐width ratio of canyon, the wave velocity of half‐space, and the incident angle and frequency content of seismic waves. The potential adverse effects of the V‐shaped canyon on the ground motion input of adjacent buildings should be considered in the seismic design. [ABSTRACT FROM AUTHOR]

The paper presents an analytical solution for the vertical dynamic interaction analysis of a poroelastic soil layer and an embedded pile with the consideration of pile-soil radial deformations. The soil is treated a three-dimensional porous continuum and described by the Boer's poroelastic model, while the pile is treated as a two-dimensional rod with both radial and vertical deformations of which the equation of motion is derived by the Hamilton's variational principle. Without the introduction of potential functions, first take the volumetric strain of soil skeleton and pore fluid pressure as intermediate variables to deal with the equations of motion for the soil and then use the separation of variables to solve the equations of motion for the soil and the pile. By imposing the boundary and continuity conditions of the pile-soil system, the dynamic impedance in frequency domain and the velocity response in time domain of the pile top are obtained. The present solution is then verified by comparing with the corresponding finite element model computation results and the existing solutions. The effects of the pile-soil parameters on the dynamic characteristic of the pile-soil system are also analyzed. Some significant conclusions are drawn, which can provide useful reference for related engineering practice. [ABSTRACT FROM AUTHOR]

Presents information on a study which investigated the seismic behavior of cantilever retaining walls supporting liquefiable backfills. Details on the centrifuge test program; Set of experimental measurements and interpretations; Effect of flexural stiffness.