單層單跨變截面輕型門式剛架荷載-位移恢復(fù)力模型研究*
王振山1，蘇明周2，馬輝1，潘秀珍1
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(1 西安理工大學(xué)土木建筑工程學(xué)院，西安 710048；2 西安建筑科技大學(xué)結(jié)構(gòu)工程與抗震教育部重點(diǎn)實(shí)驗(yàn)室，西安 710055)
［摘要］針對(duì)單層單跨變截面輕型門式剛架的恢復(fù)力模型進(jìn)行研究。首先根據(jù)整體擬靜力試驗(yàn)的破壞過(guò)程及現(xiàn)象，確定骨架曲線選用三線型形式，整個(gè)骨架曲線需確定6個(gè)重要參數(shù)，經(jīng)理論計(jì)算獲得初始剛度K1和峰值荷載Pmax，其余參數(shù)通過(guò)有限元參數(shù)分析得到的強(qiáng)度、剛度擬合公式確定；經(jīng)過(guò)回歸分析建立了彈塑性階段恢復(fù)力曲線卸載剛度退化公式。最后建立門式剛架結(jié)構(gòu)的恢復(fù)力模型；恢復(fù)力模型與試驗(yàn)得到的荷載-位移滯回曲線比較發(fā)現(xiàn)，兩者吻合程度較高。［關(guān)鍵詞］門式剛架; 骨架曲線; 滯回規(guī)則; 恢復(fù)力模型中圖分類號(hào)：TU391 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：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
* 陜西省科技廳自然科學(xué)基礎(chǔ)研究計(jì)劃項(xiàng)目（2014JW7288），西安理工大學(xué)科技創(chuàng)新計(jì)劃項(xiàng)目（2013CX026），西安理工大學(xué)博士啟動(dòng)基金(118-211408)。作者簡(jiǎn)介：王振山，博士，講師，Email：wangdayuwang@126.com。
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