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  刘宽,马煜东,黄娇,刘笑笑,苏佶智.低周反复荷载下Q460钢材框架柱抗震性能分析[J].震灾防御技术,2019,14(3):535-554, DOI:10.11899/zzfy20190307.

低周反复荷载下Q460钢材框架柱抗震性能分析
摘要:    为了进一步完善Q460钢材在抗震设计规范中相关限值的要求,本文利用有限元软件ABAQUS,以轴压比、翼缘宽厚比、腹板高厚比和壁板宽厚比为变量,建立了共48根“工”字型框架柱和“箱”型框架柱,分析了其抗震性能。结果表明:翼缘宽厚比对框架柱的能量耗散系数影响较小;能量耗散系数随轴压比、腹板高厚比(“工”字型)和壁板宽厚比(“箱”型)增大而明显减小;框架柱的极限承载力随轴压比的减小及壁板宽厚比和翼缘宽厚比的增大而逐渐增大,当腹板高厚比接近规范限值时,承载力下降趋势明显增大。与采用Q235钢材的框架柱相比,Q460钢材框架柱的延性较小,仅为2左右;当采用Q460钢材时,“工”字型框架柱的极限位移角限值建议取为0.03,“箱”型框架柱的极限位移角限值建议取为0.032。规范中对翼缘宽厚比限值的规定偏于保守,其值最大可取至9。无论是“工”字型框架柱还是“箱”型框架柱,其腹板高厚比均不宜过大。Q460钢材框架柱的刚度退化率随轴压比的增大而增强,且翼缘宽厚比越大,腹板高厚比越小,柱的初始刚度越大,刚度退化程度越明显。
作者单位
刘宽 长安大学建筑工程学院, 西安 710061 
马煜东 长安大学建筑工程学院, 西安 710061 
黄娇 长安大学建筑工程学院, 西安 710061 
刘笑笑 长安大学建筑工程学院, 西安 710061 
苏佶智 长安大学建筑工程学院, 西安 710061 
关  键  词:Q460柱  ABAQUS有限元  参数分析  抗震性能
DOI:10.11899/zzfy20190307
基金项目:国家自然科学基金(51578077)
收稿日期:2018-10-09
作者简介:刘宽,男,生于1991年。硕士研究生。主要从事结构抗震研究。E-mail:liukuan93@163.com
通讯作者:
Analysis of Seismic Performance of Q460 Steel Frame Columns under Low Cyclic Loading
Abstract:      In order to confirm the requirement of Q460 steel in seismic design better, the finite element software ABAQUS is used to simulate the seismic resistance of I-type and box-type bending members, with different axial compression ratios, flange width-to-thickness ratios, web height-to-thickness ratios and wall width-to-thickness ratio, under low cyclic repeated loading. The results showed that the difference in energy dissipation coefficient is not obvious for the members with different flange width-to-thickness ratio. The energy dissipation coefficient significantly reduces as the increase of the axial compression ratio, the web height-to-thickness ratio (I-type) and the wall width-to-thickness ratio (box-type). The ultimate bearing capacity of the specimens increases with the decrease of the axial compression ratio and the increase of width-thickness ratio of wall and flange. With the ratio of the web height-to-thickness approaches the standard limit, the downward trend of the bearing capacity exacerbates significantly. The ductility coefficient of Q235 steel column can reach 4, and that of Q460 steel column is only about 2. For the ultimate displacement angle of Q460 steel column, it is recommended to adopt 0.03 for the I-type column and 0.032 for the box-type column. In Chinese standard, the limit of the flange width-to-thickness ratio is conservative, and the value may be up to 9. The web height-to-thickness ratio should not be too large. The degree of stiffness degradation of Q460 steel column exacerbates with the increase of the axial compression ratio. The initial stiffness of the column is larger and the stiffness degradation is more severe when the flange width-to-thickness ratio increases and the ratio of the web height to thickness reduces.
Keywords:  Q460 high strength steel  ABAQUS finite element  Parametric analysis  Seismic performance
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