基于位移性能的鋼框架-支撐結(jié)構(gòu)連續(xù)性倒塌Pushdown分析*
陳昌宏1，朱彥飛1，姚堯1，黃鶯2
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（1 西北工業(yè)大學(xué)力學(xué)與土木建筑學(xué)院，西安 710129； 2 西安建筑科技大學(xué)土木工程學(xué)院，西安 710055）
［摘要］基于位移性能，對比分析了純鋼框架結(jié)構(gòu)、鋼框架-V形（跨層X形）支撐結(jié)構(gòu)與鋼框架-同層X形支撐結(jié)構(gòu)抗連續(xù)性倒塌的力學(xué)性能。研究結(jié)果表明：鋼框架-支撐結(jié)構(gòu)的荷載儲備系數(shù)LRR明顯優(yōu)于純鋼框架結(jié)構(gòu)，且鋼框架-同層X形支撐結(jié)構(gòu)優(yōu)于鋼框架-V形（跨層X形）支撐結(jié)構(gòu)。對純鋼框架結(jié)構(gòu)及鋼框架-支撐結(jié)構(gòu)進(jìn)一步開展了靜態(tài)與考慮“去柱”動力效應(yīng)的動態(tài)Pushdown分析，研究結(jié)果表明：兩種分析情形下結(jié)構(gòu)的倒塌模式基本一致，結(jié)構(gòu)剩余承載力基本相同。但是鋼框架-支撐結(jié)構(gòu)存在能夠顯著減小“瞬間去柱”引起的突變位移幅度，減緩柱損壞時結(jié)構(gòu)的動力響應(yīng)，且鋼框架-同層X形支撐結(jié)構(gòu)優(yōu)于鋼框架-V形（跨層X形）支撐結(jié)構(gòu)。［關(guān)鍵詞］鋼框架; 支撐結(jié)構(gòu); 連續(xù)性倒塌; Pushdown分析; SAP2000軟件中圖分類號：TU312+.3 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2016)06-0061-05
Pushdown analysis of progressive collapse of steel frame-brace structure based on displacement performanceChen Changhong1, Zhu Yanfei1, Yao Yao1, Huang Ying2(1 School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710129, China; 2 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China)Abstract: Based on the displacement performance, comparative analysis was performed on the mechanical properties of progressive collapse for the pure steel frame, steel frame with V-shaped (cross-layer X-shaped) brace structure and steel frame with X-shaped (same-layer X-shaped) brace structure. The results show that the Load Reserve Factor (LRR) of steel frame-brace structure system is significantly better than that of pure steel frame structure, and the LRR of steel frame with V-shaped (cross-layer X-shaped) brace structure is better than that of steel frame with X-shaped (same-layer X-shaped) brace structure. Further static and dynamic (considering dynamic effects by removing column) Pushdown analyses were carried out. The results show that the collapse modes are generally similar using these two analytical models, and there is the same situation on structural residual bearing capacity. The presence of the brace not only obviously reduces the mutation displacement amplitude for removing column instantly, but also slows down the dynamic response of structural damage, and the steel frame with X-shaped (same-layer X-shaped) brace structure is better than the steel frame with V-shaped (cross-layer X-shaped) brace structure.Keywords:steel frame; brace structure; progressive collapse; Pushdown analysis; SAP2000 software
*國家自然科學(xué)基金（51408489,51308448,51301136），陜西省自然科學(xué)基金（2014JQ7255），中央高校基本科研業(yè)務(wù)費(fèi)專項基金（3102014JCQ01047），西北工業(yè)大學(xué)本科畢業(yè)設(shè)計重點(diǎn)扶持項目。作者簡介：陳昌宏，博士，副教授， Email：changhong.chen@nwpu.edu.cn。
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