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（1 土木工程安全與耐久教育部重點(diǎn)實(shí)驗(yàn)室， 清華大學(xué)土木工程系，  北京  100084； 

2 清華大學(xué)建筑設(shè)計(jì)研究院有限公司，  北京  100084）

［摘要］上部大跨桁架拱結(jié)構(gòu)與下部混凝土框架支承結(jié)構(gòu)體系常見(jiàn)于一些大跨結(jié)構(gòu)中。對(duì)于此類混合結(jié)構(gòu)，現(xiàn)階段的設(shè)計(jì)單位多不考慮兩者間的協(xié)同工作分開(kāi)進(jìn)行分析設(shè)計(jì)，然而這樣的處理方式是否合理還有待商討。通過(guò)對(duì)某文化遺址大跨桁架拱護(hù)棚結(jié)構(gòu)的單獨(dú)計(jì)算與考慮上部護(hù)棚結(jié)構(gòu)和下部混凝土支承結(jié)構(gòu)協(xié)同工作的整體計(jì)算進(jìn)行對(duì)比，得出考慮協(xié)同工作與否，兩者在支座反力、桿件內(nèi)力、單元應(yīng)力、結(jié)構(gòu)位移和整體穩(wěn)定性方面的差異。結(jié)果顯示，該工程上部大跨桁架拱護(hù)棚結(jié)構(gòu)考慮協(xié)同工作與否，在靜力分析、動(dòng)力時(shí)程分析和整體穩(wěn)定性分析時(shí)各項(xiàng)參數(shù)計(jì)算結(jié)果均相差不大，不考慮協(xié)同工作的計(jì)算結(jié)果也可滿足工程精度要求。

［關(guān)鍵詞］協(xié)同工作； 大跨結(jié)構(gòu)； 桁架拱； 支承結(jié)構(gòu)； 整體穩(wěn)定性

中圖分類號(hào)：TU398-7文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)15-0001-05

Analysis of cooperative effect of large-span truss arch with supporting concrete structure

Shi Gang1, Chen Jingwei2,  Chen Hong2

(1 Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2 Architectural Design and Research Institute of Tsinghua University Co., Ltd., Beijing 100084, China)

Abstract:The upper large-span truss arch structure and the lower concrete frame supporting structure are common in some large-span structures. For such a mixed structure,  the current designers do not consider the cooperative effect between the two structures and design and analyze them separately. However, reasonability of this approach is to be discussed. For the large-span truss arch shed structure of a cultural site, independent calculation results of the structure were compared with that of overall calculation of the upper shed structure and the lower concrete supporting structure. It is concluded that for structures considering the cooperative effect and not considering the cooperative effect, there are differences in bearing force, component internal stress, unit stress, structural displacement and overall stability. The results show that the cooperative effect has little effect on the calculation results of the parameters in static analysis, dynamic time-history analysis and overall stability analysis, and the engineering accuracy requirements can be met if the calculation does not consider cooperative effect.

Keywords:cooperative effect; large span structure; truss arch; supporting structure; overall stability

作者簡(jiǎn)介：施剛,教授,博士生導(dǎo)師,Email: shigang@tsinghua.edu.cn。