摘要
我国现行建筑抗震设计规范采用的小震弹性设计方法无法准确预估地震动循环效应中结构产生的累积损伤。基于能量的性态设计方法能同时考虑力、位移、强震持时等因素,可反映出结构的累积滞回耗能与往复塑性变形,是有发展前景的设计方法。结构滞回能需求预估是基于能量设计方法的核心内容。文章按照现行规范设计了8个中心、偏心支撑钢框架结构算例;选用远场地震波,利用ABAQUS软件对各算例进行了动力非线性弹塑性时程分析,得出了各结构在罕遇地震下的累积滞回能、滞回能层间分布、构件的滞回能分担规律;对文献[6]、[7]提出的基于我国场地的累积滞回能谱及多自由度结构累积滞回能需求预估方法进行了评价。
The elastic design method based on strength,adopted in the current building seismic design code,can not accurately estimate the cumulative damage caused by the cyclic effect of ground motions.The energy-based seismic design is known for the consideration of structural strength and displacement,and strong earthquake duration or other factors caused by the ground motion,and can reflect the cumulative hysteretic energy and reciprocating plastic deformation of the structure.Therefore,the energy-based seismic design is a promising design method,and the prediction of hysteretic energy demand is the core content of the energy-based seismic design.In this paper,eight structural specimens of concentrically and eccentrically braced steel frame structures are designed according to the current code.Through the use of far-fault earthquake ground motions(EQGM),the nonlinear dynamic analyses of each designed structure specimens are carried out using ABAQUS software.Through the analyses,the cumulative hysteretic energy,the hysteretic energy distribution along the structural height and the ratio of hysteretic energy of each component to total hysteretic energy are obtained;the hysteretic energy spectrum based on the Chinese soil type and the method for predicting the hysteretic energy demand of steel frame with multi degree of freedom proposed by the references[6、7]are evaluated,and the reliability of the prediction method is verified.
作者
吴凯迪
顾强
WU Kai-di;GU Qiang(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou Jiangsu 215011 China)
出处
《江苏建筑》
2021年第4期40-44,62,共6页
Jiangsu Construction
关键词
支撑钢框架
地震波
弹塑性时程分析
滞回耗能
braced steel frame
earthquake ground motions
time history analysis of elastic-plastic
hysteretic energy
