抗弯钢框架近场地震反应分析  

Analysis of near-field seismic response of moment resisting steel frames

作　　者：李立[1] 顾强[1] 

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《苏州科技大学学报（工程技术版）》2017年第2期1-5,共5页Journal of Suzhou University of Science and Technology（Engineering and Technology Edition）

基　　金：国家自然科学基金项目(51278320)

摘　　要：选取20条带有明显速度脉冲的近场地震波作为地震动输入,建立近场地震动的反应谱,并与《建筑抗震设计规范》(GB50011-2010)设计反应谱进行了比较。按照现行抗震规范考虑近场地震作用增大系数1.5和1.25,分别设计了3层、6层抗弯钢框架,研究了结构在近场地震动下的反应。结果表明,近场地震动反应谱的加速度敏感区较宽,在中长周期段谱值大于规范设计反应谱的谱值;近场设计地震作用采用增大系数1.5时,对3层结构偏于保守,对6层结构偏于不安全,近场设计地震作用采用增大系数1.25时,对3层、6层结构都偏于不安全。20 near-field earthquake records with velocity pulses are selected as ground motion inputs. The re- sponse spectrum of the near-field ground motion is established and then compared with the design spectrum of Code for Seismic Design of Buildings （GB50011-2010）. According to the current seismic design code that the ground motion is multiplied by amplification factor 1.5 and 1.25, a 3-story and a 6-story moment-resisting steel frames are modeled and the seismic responses of the structure under the near-field earthquake are studied. It is indicated that the response spectrum of the near-field ground motion has a wilder acceleration- sensitive region, and the spectral value is greater than that of the design spectrum. When the ground motion is multiplied by am- plification factor 1.5, it is conservative for the 3-story structure and is unsafe for the 6-story structure; and when the ground motion is multiplied by amplification factor 1.25, it is unsafe for the 3-story and 6-story structure.

关 键 词：速度脉冲 近场地震动 增大系数 抗弯钢框架 

分 类 号：TU391[建筑科学—结构工程]