钢筋混凝土管柱-钢桁架竖向混合结构动力弹塑性分析  

Elasto-Plastic Analysis on a Vertical Hybrid Structure Consisting of Reinforced Concrete Pipe Columns and Steel Truss

作　　者：岳健广[1] 白国良[2] 钱江[1] 雷拓[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]西安建筑科技大学土木学院,西安710055

出　　处：《结构工程师》2009年第4期19-23,共5页Structural Engineers

基　　金：国家重点基础研究发展计划(973)项目(2007CB714202)

摘　　要：利用集中塑性铰有限元模型,对钢筋混凝土管柱-钢桁架竖向混合结构进行了动力弹塑性计算,分析了结构的破坏模式,依据基于结构内容物的抗震性能指标,评价了该结构的抗震性能。研究表明:结构破坏集中在柱根,内柱首先出现塑性铰,结构进入塑性后,角柱的塑性发展程度最深;内柱与角柱为结构薄弱环节;钢桁架屈服杆件主要分布在悬挑端和柱头区;7度设防时,结构满足基于内容物抗震设防的基本目标,且在达到基本目标时承受的地震作用加速度峰值约为340 gal。By means of the plastic hinge method, an elasto-plastic model for a vertical hybrid structure consisting of reinforced concrete pipe columns and steel truss was established. The elasto-plastic time-history analysis was employed to study the structural responses under earthquake action. According to the performance index based on internal equipment of the structure, the seismic behavior of the structure was evaluated. The results indicate that the column is the single-line to resist earthquake for this structure; the hinge firstly occurs in the internal column, the corner column plastic deformation is larger than other columns; the corner and internal columns are the weak points of the structure; most hinges of the steel truss occur in overhanging and over the top of the column; the seismic performance level of the structure is above the basic aim of earthquake fortification based on internal equipment; the peak acceleration of the earthquake action when the structure reaches the basic aim is about 340 gal.

关 键 词：竖向混合结构 钢筋混凝土管柱 弹塑性分析 塑性铰 

分 类 号：TU398.9[建筑科学—结构工程]