(1 中国航空规划建设发展有限公司，北京 100120； 2 北京工业大学，北京 100124)
［摘要］体内预应力大悬挑钢管桁架结构是在桁架的上弦钢管之内设置拉索，使索与钢管桁架共同工作的预应力钢结构体系，可以提高结构的静、动力性能和稳定性能。以一幢办公楼的体内预应力大悬挑屋盖钢结构工程为例，通过对结构进行静力计算、整体稳定计算和大震作用弹塑性时程分析，全面研究了初始缺陷、几何非线性、材料弹塑性和预应力对结构整体稳定性能的影响，分析了在罕遇地震下结构的抗震延性性能。
［关键词］大悬挑桁架；几何非线性；材料非线性；稳定性能
Design and research on large span internal prestressed cantilevered pipe trusses
Guan Zhizhong1, Wang Mingzhu1, Ge Jiaqi1, Hu Yang2(1 China Aviation Planning and Construction Development Co., Ltd., Beijing 100120, China； 2 Beijing University of Technology, Beijing 100124, China)
Abstract:The large span internal prestressed cantilevered pipe trusses structure system means that the prestressed cable is installed in the penetrated welded pipe truss on the top chord, to form a new-style internal prestressed structural steel system of the coincident work of the pipe truss and the cable, which is able to adjust the structural mechanics and increase the structural static behavior, dynamic behavior and the overall stability performance.  The large span internal prestressed cantilevered roof structure for an office building is selected to obtain the impact of the prestress on the structural internal force by static analysis, overall stability analysis and ultimate seismic elastic-plastic time-history analysis. The structural overall stability analysis is conducted considering initial imperfection, geometric nonlinearity, elastic-plastic material and prestress. The ultimate seismic elastic-plastic analysis is conducted. The results provide some references to other similar projects.
Keywords:large span cantilevered truss; geometric nonlinearity; material nonlinearity; stability
作者简介：管志忠(1960-)，男，高级工程师，Email:capdi.gssd@vip.163.com。
参考文献
［1］陆赐麟，尹思明，刘锡良.现代预应力钢结构［M］.北京：人民交通出版社，2003.
［2］韩庆华，裴波，等.预应力组合钢网架结构的理论分析与应用研究［J］.建筑工程学报,2004，(1)：87-92.