Wang, Jinting

Large-Scale Wave Propagation Simulation From Fault Rupture To Dam Structures

Abstract eng:
Determination of ground motion is a key issue for seismic design of new dams and safety evaluation of existing dams. In the current practice of dam engineering, the parameters of ground motion, including peak ground simulation and spectrum, at a given dam site are usually determined based on attenuation relationships. This paper proposes a “rupture-dam” approach to evaluate the seismic response of dams, in which ground motion is synthesized based on large-scale wave propagation simulation from fault rupture to canyons instead of attenuation relationships. Firstly, the ground motions along the canyon are generated by numerically computing the seismic waves radiated from source rupture via propagation path to local site. Subsequently, the seismic responses of dams are analyzed to the generated ground motions. This approach may offer ground motion for a specific dam, which takes into account the effects of source mechanism, propagation path, and local site on the seismic response of dams. Based on this concept, we integrate multifarious models to implement the rupture-dam simulation: the source model and velocity model are adopted from achievements in seismology; the realistic topography is represented by NASA’s global digital elevation model; and the wave equations of motion are solved by the modified spectral element method code SPECFEM3D. With these models combined, the ground motions containing sourcepropagation-site effect are provided as the input of high dams, and the dynamic analysis of dam-reservoir-foundation system is conducted using the finite element model. The 210-m Dagangshan dam in Southwest China is analyzed as an example. The results show that the dam responses are affected by both the directivity and the spatial varying of ground motion at the canyon. These factors should be rationally considered in the seismic safety evaluation of dams.

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.

Record appears in:

ITAM Library > Papers