斜拉桥与刚构协作体系桥梁的静力特性研究

Research on static characteristics of cooperative cable-stayed and rigid frame system bridge

斜拉桥与刚构协作体系桥梁得到广泛应用,形式可分为分载协作和共载协作,本文以金马大桥为背景,研究了对称形式的分载协作体系,考虑协作体系桥梁中连接部位和协作体跨度比例的不同,并和常规斜拉桥比较,分析了结构的静力特性。当合理选择连接形式和协作体结构比例后,斜拉桥与刚构可形成良好的协作体系:刚构提供给主跨较大的刚度,相比长边索支撑更为经济合理,斜拉索则可在成桥后调整刚构内力和变形,从而增大了跨越能力。

Bridges of cooperative cable-stayed and rigid frame system are widely used and may be divided into bridges of different-load cooperative system and of same-load cooperative system.Based on the Golden Horse Bridge-the largest concrete cable-stayed structure of single tower in the world,the static characteristics of symmetrical different-load cooperative system is studied and compared with traditional cable-stayed bridges.In the research the variations of connection forms of joint zones and span ratios of cooperative structures are considered.Favorable cooperation is achieved only after both the above variations are reasonably determined,and then rigid frames provide stiffness for the whole structure and substitute the long side cables efficiently,and the internal forces and displacements of rigid frames may be adjusted by tensioning cables appropriately,thus the cooperative structure can span longer distance.