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(1 重慶大學(xué)土木工程學(xué)院， 重慶 400045； 2 重慶大學(xué)山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室，重慶 400045； 3 中國(guó)建筑西南設(shè)計(jì)研究院有限公司， 成都 610042)

摘要: 吊腳框架結(jié)構(gòu)接地柱高度不一，吊腳層側(cè)向剛度的大小與分布均勻性會(huì)使結(jié)構(gòu)的動(dòng)力特性與地震響應(yīng)發(fā)生變化。 為研究吊腳框架動(dòng)力特性與地震響應(yīng)特征，對(duì)吊腳框架結(jié)構(gòu)的動(dòng)力特性規(guī)律進(jìn)行了理論分析與驗(yàn)證，發(fā)現(xiàn)接地短柱高度對(duì)吊腳層側(cè)向剛度及結(jié)構(gòu)周期影響顯著。 通過(guò)改變接地短柱高度與吊腳層側(cè)向剛度分布均勻程度建立了 7 組模型，采用 PERFORM￣3D 有限元軟件進(jìn)行數(shù)值模擬，對(duì)比分析地震作用下樓層剪力、層間位移及構(gòu)件的轉(zhuǎn)角變形、內(nèi)力分布等地震響應(yīng)特征。 結(jié)果表明，接地短柱高度的減小會(huì)使吊腳層從整體破壞模式轉(zhuǎn)向接地短柱及其周圍構(gòu)件的局部破壞模式，結(jié)構(gòu)的薄弱層從吊腳層向上部樓層轉(zhuǎn)移；吊腳層側(cè)向剛度分布更均勻時(shí)，層間位移角明顯減小，吊腳層順坡向靠近側(cè)向短柱的梁軸力突變現(xiàn)象得到改善，接地柱損傷加重，1 層構(gòu)件損傷減輕。在設(shè)計(jì)吊腳框架結(jié)構(gòu)時(shí)，使吊腳層側(cè)向剛度分布均勻，同時(shí)重點(diǎn)關(guān)注接地短柱及其周圍構(gòu)件的設(shè)計(jì)是非常重要的。

關(guān)鍵詞: 吊腳框架； 接地短柱； 動(dòng)力特性； 地震響應(yīng)； 側(cè)向剛度； 非線性分析

中圖分類號(hào):TU375. 4 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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

∗國(guó)家自然科學(xué)基金項(xiàng)目(51638002，51878101，51578093)。

第一作者:李英民，博士，教授，博士生導(dǎo)師，主要從事地震工程與工程抗震研究，Email:liyingmin@ cqu.edu.cn。

[引用本文] 李英民，余洪翔，唐洋洋，等. 吊腳框架結(jié)構(gòu)動(dòng)力特性及其地震響應(yīng)特征分析[ J]. 建筑結(jié)構(gòu)，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.