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（北京工業(yè)大學建筑工程學院，100022）

［提要］對預應力張弦拱桁架進行了模型試驗研究，通過多次張拉預應力索分級加載，驗證可滑移彈性支座在張拉過程中的滑移性能，測試多次張拉過程中拱桁架構(gòu)件的應力及結(jié)構(gòu)的位移變形，并與理論計算結(jié)果進行了對比。結(jié)果顯示，多次施加預應力可以有效降低結(jié)構(gòu)內(nèi)部應力峰值，增大結(jié)構(gòu)承載能力。試驗模型及結(jié)論可以為今后此類工程的設(shè)計和施工提供參考。

［關(guān)鍵詞］多次預應力；張弦拱桁架；靜力試驗

Static Load Experimental Multiprestressed Arch Truss String Structure Model/Zhang Ailin, Wang Dongmei,   Zhang Guojun,  Liu Xuechun(College of Architecture and Civil Eng., Beijing University of Technology, Beijing 100022,China)

Abstract:The model experimental of prestressed arch truss string is presented. The performance of the sliding elastic baseisolated bearing is tested through multitensioning cable and stepped loading, and the member stress and structural displacement are measured during the experiment process. The experiment result is compared with the finite element analysis result. The experiment shows that it can reduce the peak value of the structural stress and increase the loadbearing ability effectively through multitensioning cable and stepped loading.

Keywords:multiprestressed; arch truss string structure; static load experiment

*國家自然科學基金資助項目(50278005)；北京市科委奧運專項資助項目(Z0005191040111)。