吊脚框架结构动力特性及其地震响应特征分析
引用文献：
李英民 余洪翔 唐洋洋 姜宝龙 王钧. 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，2022，48（04）：69-75，68.
LI Yingmin YU Hongxiang TANG Yangyang JIANG Baolong WANG Jun. Analysis on dynamic characteristics and seismic response characteristics of the stilted frame structure[J]. Building Structure，2022,48（04）：69-75，68.
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
基金：国家自然科学基金项目(51638002,51878101,51578093)。
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[4] 程志辉，刘凌菁，张震.吊脚或掉层框架结构在大震下的倒塌概率分析[J].工程抗震与加固改造，2017,39(6):94-98.
[5] 王丽萍.山地建筑结构设计地震动输入与侧向刚度控制方法[D].重庆：重庆大学，2010.
[6] 王丽萍，李英民，郑妮娜.5·12汶川地震典型山地建筑结构房屋震害调查[J].西安建筑科技大学学报(自然科学版),2009,41(6):822-826.
[7] 王丽萍，李英民，韩军.山地底部不等高柱框架结构侧向刚度计算方法[J].哈尔滨工程大学学报，2015,36(11):1481-1487.
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[11] Prestandard and commentary for the seismic rehabilitation of building:FEMA 356 [S].Washington,D.C.:ASCE for the Federal Emergency Management Agency,2000.
Analysis on dynamic characteristics and seismic response characteristics of the stilted frame structure
Abstract: The height of the grounding column of the stilted frame structure is different, and the size and distribution of the lateral stiffness of the stilted foor will change the dynamic characteristics and seismic response of the structure. To study the dynamic characteristics and the seismic response characteristics of the stilted frame structure, the theoretical analysis and verification of the dynamic characteristics law of the stilted frame structure were carried out, and it is found that the height of 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 lateral stiffness distribution of the stilted foor, the numerical simulation was carried out by finite element software PERFORM-3 D, and seismic response characteristics such as floor shear, inter-story displacement, rotation state of components, and internal force distribution under earthquake action were compared and analyzed. The results show that when the height of the grounding short column decreases, the failure mode of the stilted foor is transferred from the overall failure to the concentrative failure of the grounding short column and the members around them, and the weak floor moves from the stilted floor to the upper floor. When the lateral stiffness distribution of the stilted floor is more uniform, the interstory drift angle decreases sharply, the sudden change phenomenon of axial force in beams of the stilted foor close to the lateral short column along the slope is improved, the damage of the grounding columns increases, and the damage of the first floor decreases. It is of great importance to keep the uniform lateral stiffness of the stilted floor and focus on the grounding short columns and the surrounding components in the design of stilted frame structure.
Keywords: stilted frame; grounding short column; dynamic characteristic; seismic response; lateral stiffness; nonlinear analysis
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