Study on the Seismic Damaging Effects of Mountainous Towns in Wenchuan Earthquake: Fid-Bau Portal

Study on the Seismic Damaging Effects of Mountainous Towns in Wenchuan Earthquake

Zhang, Hong-Chang / Li, Yu-Sheng / Bao, Jie

Through the survey and research on seismic damage phenomena of damaged towns by Wenchuan Earthquake and geological environment, this article identify that the seismic damage effect of towns damaged by Wenchuan Earthquake mainly includes four types which are fault dislocation effect, site and foundation effect, topography motion amplified action and geologic hazard effect. Site selection of the reconstruction of damaged towns and seidmic design of building and other problems are complex and systemic engineering problems, and they refer to many complex factors such as earthquake faults, geologic hazards, national well-being and the people's livelihood, economic development and so on. The basic principles of consideration should be: for the mountain towns which are located at seismic fault zone and exist serious geological disaster, they must be avoided and relocated off-site; for the towns which are away from the fault for a distance and have no fatal geological disaster risk, we should follow the principles of "scientific planning, normative avoidance and reasonablely adjust the seismic standards" and reconstruct in the former location. Reconstruction site should also pay attention to the concealment of geological hazards, the multiplicity and long-term sustainability of induced factors and so on, so we should enhance the suitability evaluation of the geological environment and risk assessment of geological disaster.