单层单跨变截面轻型门式刚架荷载-位移恢复力模型研究*
- 摘 要
-
(1 西安理工大学土木建筑工程学院，西安 710048；2 西安建筑科技大学结构工程与抗震教育部重点实验室，西安 710055)
［摘要］针对单层单跨变截面轻型门式刚架的恢复力模型进行研究。首先根据整体拟静力试验的破坏过程及现象，确定骨架曲线选用三线型形式，整个骨架曲线需确定6个重要参数，经理论计算获得初始刚度K1和峰值荷载Pmax，其余参数通过有限元参数分析得到的强度、刚度拟合公式确定；经过回归分析建立了弹塑性阶段恢复力曲线卸载刚度退化公式。最后建立门式刚架结构的恢复力模型；恢复力模型与试验得到的荷载-位移滞回曲线比较发现，两者吻合程度较高。［关键词］门式刚架; 骨架曲线; 滞回规则; 恢复力模型中图分类号：TU391 文献标识码：A 文章编号：1002-848X(2015)15-0012-05
Study on load-displacement restoring force model of single-story single-bay ling-weight portal frame with variable cross-sectionsWang Zhenshan1, Su Mingzhou2 , Ma Hui1, Pan Xiuzhen1(1 School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China; 2 Key Laboratory of Structural and Aseismatic Engineering of Education Ministry, Xi'an University of Architecture and Technology, Xi'an 710055, China)Abstract:The restoring force model of single-story single-bay light-weight portal frame with variable cross-sections was studied. First, according to the failure process and phenomenon of the whole structure pseudo-static test, the tri-linear model was selected for skeleton curve and six important parameters need to be determined for the curve. The initial stiffness K1 and peak load Pmax could be obtained by theoretical calculations, and the remaining parameters were obtained from the strength and stiffness fitting formulas which were obtained from finite element analyses. Furthermore, the unloading stiffness degradation formula for restoring force curve in elastic-plastic stage was obtained by regression analysis. Finally, the restoring force model of portal frame structure was set up. The comparison shows that the load-displacement hysteretic curve of the model is in good agreement with that from the test.Keywords: portal frame; skeleton curve; hysteretic rule; restoring force model
* 陕西省科技厅自然科学基础研究计划项目（2014JW7288），西安理工大学科技创新计划项目（2013CX026），西安理工大学博士启动基金(118-211408)。作者简介：王振山，博士，讲师，Email：wangdayuwang@126.com。
