基于HAZUS的预应力混凝土简支梁桥地震风险评价  

Seismic Risk Evaluation of PC Simply-Supported Beam Bridges Based on HAZUS

作　　者：夏春旭 柳春光[1,2] 

机构地区：[1]大连理工大学工程抗震研究所,辽宁大连116024 [2]海岸与近海工程国家重点实验室,辽宁大连116024

出　　处：《桥梁建设》2016年第6期61-66,共6页Bridge Construction

基　　金：国家自然科学基金项目(51678107);高等学校博士学科点专项科研基金项目(20130041110036)~~

摘　　要：为确定高烈度地区预应力混凝土简支梁桥的地震风险概率分布,以8度设防地区某3×30m预应力混凝土简支梁桥为例,对其进行地震风险评价。考虑支座、桥台和桩土相互作用对桥梁结构的影响,基于OpenSees平台建立全桥有限元模型,采用极值Ⅲ型地震危险性概率分布模型和33组远场地震动分别进行地震危险性和结构易损性分析,并结合美国地震风险评价系统HAZUS进行结构震后损失估计。结果表明:在地震动强度0.1g^0.2g时,该桥的地震年均发生概率最大,在地震动强度大于0.2g时,该桥的年均发生概率逐渐降低;在相同地震动强度作用下支座优于墩柱的抗震性能;当地震动强度大于0.8g时,该桥的年均预期损失比范围为0.002 9~0.003 2;考虑全部强度地震动对应的年均预期损失比范围为0.042 85~0.060 9。To determine the seismic risk probability distribution of prestressed concrete （PC） simply-supported beam bridges in the high seismic intensity regions, a 3 X 30-m span bridge of the same kind in the region of 8 degree seismic intensity fortification was taken as an example and the seismic risk of the bridge was evaluated. Considering the influences of the bearings, abutments and pile-soil interaction on the bridge structure and based on the OpenSees platform, the finite element model for the whole bridge of the bridge was established and the seismic hazards and structural vulnerability were respectively analyzed, using the seismic hazard probability distribution model of extreme value III and 33 groups of the far-field ground motion. Further according to the HAZUS, the American seismic risk evaluation system, the structural loss of the bridge after the earthquake was estimated. The results indicate that when the intensity of the ground motion is 0. lg^0.2g, the annual average seismic occurrence probability of the bridge is the highest. When the intensity of the ground motion is greater than the 0.2g, the annual average seismic occurrence probability gradually decreases and under the action of the same intensity of the ground motion, the seismic performance of the bearings of the bridge is superior to that of the pier columns. When the intensity of the ground motion is greater than 0.8g, the ranges of the predicted annual average loss ratios of the bridge are 0. 002 9-0. 003 2 and when the whole intensity of the ground motion is considered, the corresponding ranges of the predicted annual average loss ratios are 0.042 85-0.060 9.

关 键 词：简支梁桥 OPENSEES 有限元法 地震危险性分析 系统易损性分析 地震风险评价 桥梁抗震 

分 类 号：U448.217[建筑科学—桥梁与隧道工程] TU352.1[交通运输工程—道路与铁道工程]