受压支撑屈曲后剩余承载能力探讨  

DISCUSSION ON THE REMAINING BEARING CAPACITY OF COMPRESSIVE BRACES AFTER BUCKLING

作　　者：杨俊芬[1] 顾强[2] 万红 彭奕亮 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]苏州科技学院土木工程系,江苏苏州215011 [3]河南省电力勘测设计院,郑州450007

出　　处：《工业建筑》2011年第4期124-128,共5页Industrial Construction

基　　金：国家自然科学基金项目(50578099);陕西省重点学科建设专项资金资助项目(E01001);陕西省教育厅科学研究计划项目(09JK554);西安建筑科技大学人才科技基金项目(RC0927)

摘　　要：为考察受压支撑屈曲之后的剩余承载力,按照受压支撑屈曲之后还有70%剩余承载能力的假设,设计了一缩尺人字形中心支撑钢框架试件,并进行了推覆试验研究,在经历相当于结构高度1/30的顶点位移变形下,横梁并未出现明显破坏。然后分别采用SAP和ANSYS有限元程序对试验进行有限元模拟,通过SAP中塑性铰的参数设置以及ANSYS中受压支撑屈曲之后轴力的提取发现,受压支撑屈曲之后的剩余承载能力约为70%。最后采用ANSYS有限元程序分别对一人字形和V形中心支撑钢框架进行大震作用下的弹塑性时程分析,通过提取大震下受压支撑屈曲之后的轴力,进一步证实了受压支撑屈曲之后的剩余承载能力约为70%。In order to research the remaining bearing capacity of a compressive brace after buckling,a reduced scale inverted V-CBSF was designed in this paper,according to the hypothesis that a compressive brace would remain 70% of the bearing capacity after buckling,and a pushover test was carried out.When the roof displacement reached at 1 /30 of the structure height,there was not obvious destroy on the beams.Then SAP program and ANSYS program were respectively adopted to simulate the test.Through the parameter setting of the plastic hinge in SAP and the axial force extracting of the compressive braces after buckling in ANSYS,it was discovered that the remained bearing capacity of compressive braces after buckling was about 70%.At last,ANSYS program was adopted to carry on elastic-plastic time-history analysis on an inverted V-CBSF and a V-CBSF under rarely occurred earthquake.Through extracting the axial force of the compressive braces after buckling,it was verified that the remained bearing capacity of compressive braces after buckling was about 70%.

关 键 词：受压支撑 剩余承载能力 静力推覆试验 PUSHOVER分析 弹塑性时程分析 

分 类 号：TU391[建筑科学—结构工程] TU312