一、前言随着科学技术的进步与发展,抗震理论与应用技术已由单体建筑物逐步发展到群体、区域或整个城市。由于地震目前还不能诱发或阻止,所以人们一方面继续研究它的破坏机理,另一方面则研究如何才能减少地震所造成的人员伤亡和财产损失。这样,城 I. INTRODUCTION With the advancement and development of science and technology, seismic theory and application technology have gradually evolved from single buildings to groups, regions or entire cities. Since the earthquake can not be induced or stopped at present, people continue to study its destruction mechanism on the one hand, and on the other hand, it studies how to reduce the casualties and property losses caused by the earthquake. In this way, the city