(东南大学混凝土及预应力混凝土结构教育部重点实验室，南京 210096)

［提要］研究了张弦梁结构的承载可靠性能，采用响应面方法重构出结构的极限状态方程，用一次二阶矩算法计算可靠指标。分析了荷载比例、矢跨比、垂跨比和抗力类变量的变异系数对结构可靠性能的影响。得出了矢跨比基于承载可靠性能的最优值。为张弦梁结构的设计提供了有益的建议。

［关键词］张弦梁结构；可靠度；荷载比例；矢跨比；垂跨比

Influences of Some Parameters on Reliability of  Beam String Structure/Jiang Youbao, Feng Jian,   Jiang Jianfeng, Meng Shaoping(Key Laboratory of RC/PC Structures of Ministry of Education, Southeast University, Nanjing 210096, China)

Abstract:Beam-string structures have been adopted in several large-span structures. The mechanical reliable performances of the structure are analyzed. The limit state equation is restructured with the response surface method (RSM), and  the reliability index is calculated with the first order reliability method (FORM). The influences of the load combination ratio, rise-span ratio, sag-span ratio and resistant variable variance on the reliable performance are discussed. The optimal rise-span ratio of the arch is obtained. These conclusions provide some useful suggestions to the design of beamstring structures.

Keywords:

beam string structure; reliability; load combination ratio; risespan ratio; sagspan ratio

*国家自然科学基金项目(50478075)；江苏省自然科学基金项目(BK2003061)。