- 摘 要
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(1 重慶大學(xué)山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點實驗室， 重慶 400045；2 重慶大學(xué)土木工程學(xué)院， 重慶 400045)
［摘要］山地結(jié)構(gòu)的受力性能與普通結(jié)構(gòu)有顯著差別。基于LS-DYNA的截面纖維模型，通過與一榀4跨3層平面框架在移除中柱后的擬靜力倒塌試驗結(jié)果進(jìn)行對比，驗證了纖維模型的合理性。采用拆除構(gòu)件法中的非線性動力法對普通框架結(jié)構(gòu)和掉層層數(shù)、掉層跨數(shù)各不相同的掉層框架結(jié)構(gòu)共6個算例進(jìn)行了抗連續(xù)倒塌性能分析，研究普通框架結(jié)構(gòu)與掉層框架結(jié)構(gòu)抗連續(xù)倒塌性能的差異以及掉層層數(shù)、掉層跨數(shù)對掉層框架結(jié)構(gòu)抗連續(xù)倒塌能力的影響。結(jié)果表明：懸鏈線效應(yīng)對于RC框架結(jié)構(gòu)抗連續(xù)倒塌性能有顯著的提升作用；掉層框架結(jié)構(gòu)上、下接地層的抗連續(xù)倒塌性能差異大；下接地層區(qū)域，掉層框架結(jié)構(gòu)抗連續(xù)倒塌性能低于普通框架結(jié)構(gòu)，上接地層區(qū)域則相反；隨掉層層數(shù)增加，掉層框架結(jié)構(gòu)抗連續(xù)倒塌性能減弱；隨掉層跨數(shù)增加，掉層框架結(jié)構(gòu)抗連續(xù)倒塌性能增強(qiáng)。
［關(guān)鍵詞］掉層框架結(jié)構(gòu)； 纖維模型； 抗連續(xù)倒塌性能； 懸鏈線效應(yīng)； 拆除構(gòu)件法
中圖分類號：TU375-4，TU317-1 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)11-0066-07
Analysis on progressive collapse resistant capacity of typical mountainous step-terrace frame structures
YANG Youfa1,2, YANG Tianhang2, CHEN Qian2
(1 Key Lab of Education Ministry for Construction and New Technology of Mountain Cities, Chongqing University， Chongqing 400045， China；2 College of Civil Engineering, Chongqing University， Chongqing 400045， China)
Abstract: The mechanical properties of mountainous structures are significantly different from those of ordinary structures. Based on the LS-DYNA fiber model, the rationality of the fiber model was verified by comparing with the quasi-static collapse test results of a 4-span 3-story plane frame after removing the central column.The nonlinear dynamic method of the alternative path method was used to analyze the progressive collapse resistance of six examples of ordinary frame structure and step-terrace frame structure with different number of dropped story and dropped span. The difference of progressive collapse resistance between ordinary frame structure and step-terrace frame structure and the influence of dropped stories and dropped spans on the progressive collapse resistance of step-terrace frame structure were studied. The results show that the catenary action can significantly improve the progressive collapse capacity of RC frame structures. The progressive collapse resistance of the dropped part and upper part of the step-terrace frame structure is different, and the progressive collapse resistance of the dropped part is lower than that of the ordinary frame structure, but the upper part is on the contrary. With the increase of the number of dropped story, the progressive collapse resistance of the step-terrace frame structure decreases, with the increase of the number of dropped span, the progressive collapse resistance of the step-terrace frame structure increases.
Keywords:step-terrace frame structure； fiber model； progressive collapse resistant capacity； catenary action； alternate path method
*國家自然科學(xué)基金項目（51638002）。
作者簡介：楊佑發(fā)，博士，教授，Email: yfyang@cqu.edu.cn。
