(1 重庆大学土木工程学院， 重庆 400045； 2 重庆大学山地城镇建设与新技术教育部重点实验室，重庆 400045； 3 中国建筑西南设计研究院有限公司， 成都 610042)

摘要: 吊脚框架结构接地柱高度不一，吊脚层侧向刚度的大小与分布均匀性会使结构的动力特性与地震响应发生变化。 为研究吊脚框架动力特性与地震响应特征，对吊脚框架结构的动力特性规律进行了理论分析与验证，发现接地短柱高度对吊脚层侧向刚度及结构周期影响显著。 通过改变接地短柱高度与吊脚层侧向刚度分布均匀程度建立了 7 组模型，采用 PERFORM￣3D 有限元软件进行数值模拟，对比分析地震作用下楼层剪力、层间位移及构件的转角变形、内力分布等地震响应特征。 结果表明，接地短柱高度的减小会使吊脚层从整体破坏模式转向接地短柱及其周围构件的局部破坏模式，结构的薄弱层从吊脚层向上部楼层转移；吊脚层侧向刚度分布更均匀时，层间位移角明显减小，吊脚层顺坡向靠近侧向短柱的梁轴力突变现象得到改善，接地柱损伤加重，1 层构件损伤减轻。在设计吊脚框架结构时，使吊脚层侧向刚度分布均匀，同时重点关注接地短柱及其周围构件的设计是非常重要的。

关键词: 吊脚框架； 接地短柱； 动力特性； 地震响应； 侧向刚度； 非线性分析

中图分类号:TU375. 4 文献标志码:A 文章编号:1002￣848X(2022)04￣0069￣07

DOI:10. 19701 / j.jzjg.20200586

Analysis on dynamic characteristics and seismic response characteristics of the stilted frame structure

LI Yingmin1，2， YU Hongxiang1， TANG Yangyang1， JIANG Baolong1， WANG Jun3

(1 School of Civil Engineering， Chongqing University， Chongqing 400045， China； 2 Key Laboratory of New Techniquefor Construction of Cities in Mountain Area of the Ministry of Education， Chongqing University， Chongqing 400045，China； 3 China Southwest Architectural Design and Research Institute Co.， Ltd.， Chengdu 610042， China)

Abstract:The height of the grounding column of the stilted frame structure is different， and the size and distribution of thelateral stiffness of the stilted foor will change the dynamic characteristics and seismic response of the structure. To study thedynamic characteristics and the seismic response characteristics of the stilted frame structure， the theoretical analysis andverification of the dynamic characteristics law of the stilted frame structure were carried out， and it is found that the heightof the grounding short column has a significant influence on the lateral stiffness of the stilted foor and structural period.Seven models were established by changing the height of the grounding short column and the uniformity of the lateralstiffness distribution of the stilted foor， the numerical simulation was carried out by finite element software PERFORM￣3D，and seismic response characteristics such as floor shear， inter￣story displacement， rotation state of components， and internalforce distribution under earthquake action were compared and analyzed. The results show that when the height of thegrounding short column decreases， the failure mode of the stilted foor is transferred from the overall failure to theconcentrative failure of the grounding short column and the members around them， and the weak floor moves from the stiltedfloor to the upper floor. When the lateral stiffness distribution of the stilted floor is more uniform， the interstory drift angledecreases sharply， the sudden change phenomenon of axial force in beams of the stilted foor close to the lateral short columnalong the slope is improved， the damage of the grounding columns increases， and the damage of the first floor decreases. Itis of great importance to keep the uniform lateral stiffness of the stilted floor and focus on the grounding short columns andthe surrounding components in the design of stilted frame structure.

Keywords:stilted frame； grounding short column； dynamic characteristic； seismic response； lateral stiffness； nonlinear analysis

∗国家自然科学基金项目(51638002，51878101，51578093)。

第一作者:李英民，博士，教授，博士生导师，主要从事地震工程与工程抗震研究，Email:liyingmin@ cqu.edu.cn。

[引用本文] 李英民，余洪翔，唐洋洋，等. 吊脚框架结构动力特性及其地震响应特征分析[ J]. 建筑结构，2022，52(4):69￣75，68. LI Yingmin， YU Hongxiang， TANG Yangyang， et al. Analysis on dynamic characteristics and seismicresponse characteristics of the stilted frame structure[J]. Building Structure，2022，52(4):69￣75，68.