（北京工业大学建筑工程学院，100022）

［提要］对预应力张弦拱桁架进行了模型试验研究，通过多次张拉预应力索分级加载，验证可滑移弹性支座在张拉过程中的滑移性能，测试多次张拉过程中拱桁架构件的应力及结构的位移变形，并与理论计算结果进行了对比。结果显示，多次施加预应力可以有效降低结构内部应力峰值，增大结构承载能力。试验模型及结论可以为今后此类工程的设计和施工提供参考。

［关键词］多次预应力；张弦拱桁架；静力试验

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

*国家自然科学基金资助项目(50278005)；北京市科委奥运专项资助项目(Z0005191040111)。