预应力加强型钢拱梁及其改进结构的性能研究

加强型钢拱梁是根据结构在承受竖向荷载时的内力及变形图,在钢拱梁平面内增加适当的撑杆和加强型索,以改善其受力性能、提高刚度和承载力的新型结构体系.通过有限元软件AN SY S分析了加强型钢拱梁在不同竖向荷载作用下以及不同初始加强型时应力和位移的变化规律,并依据钢拱梁在全跨和半跨荷载作用下的受力特征对加强型钢拱梁进行了改进和有限元分析.结果表明能较大地提高结构的刚度和承载力,而改进后的加强型钢拱梁对于抵抗半跨荷载的刚度和承载力又有明显的改善.

Behavior study of pre-stress reinforced steel arch beams and improved structures

A new type of structures that called prestress steel arch beam is introduced in this paper where proper stay bars and pre-stress 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 rule of stress and deformation under vertical loads or pre-stress.Beside,according to the behavior of the pre-stress steel arch beam subject to half-span vertical loads,the improved structure that adding stay bars and cables on steel arch beams based on the variation of the bending moment diagram along the axis of the arch subjected to the uniformly full-span vertical load is proposed and the analysis model is established.The calculation results indicate that prestress reinforced steel arch beam have obvious superiority and stiffness and capacity of the improved structure subjected to the half-span loads increases obviously.