(兰州理工大学土木工程学院，730050)

［提要］预应力加强型钢拱是指根据大跨度钢拱承受竖向荷载时的内力及变形分布,在钢拱轴线平面内增加适当的撑杆和预应力索,以改善其受力性能、提高刚度和承载力的新型结构体系。运用有限元软件ANSYS，分析了预应力加强型钢拱在不同竖向荷载作用下以及施加不同初始预应力时应力和位移的变化规律,同时与普通大跨度钢拱进行了对比,结果显示预应力加强型钢拱具有很大的优越性,刚度和承载力都有很大的提高。

［关键词］加强型钢拱；预应力；刚度；承载力

Property of Large Span Prestress Reinforced Steel Arch Beam/Wang Xiuli, Chen Zhixiang (School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050,China)

Abstract:A new type structure that called prestress reinforced steel arch beam is introduced where proper stay bars and prestress cables are arranged along the axis of the steel arch beam according to the variation of the bending moment diagram of the steel arch beam subjected to the uniformly distributed vertical load. The finite element analysis software ANSYS has been used to analyze the variation law of stress and deformation under vertical loads or prestress. The comparison for analysis models of commonly steel arch beam and prestress reinforced steel arch beam has been carried out, and the results show that the prestress reinforced steel arch beam has great superiority and its stiffness and load capacity increased greatly.

Keywords:reinforced steel arch beam; prestress; stiffness; load capacity

*国家自然科学基金资助项目(50338010)；兰州理工大学优秀青年教师资助计划项目。