The Analysis of the Non-Axial Force Connection for the Earth-Anchored Cable-Stayed Bridge

Yajun Zhang, Y. Yang, Shoufeng Tang, Yuanxin Liao, Wangxing Ding, Yuqing Liu
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Abstract

The Danjiangkou Reservoir Bridge is the earth-anchored light composite cable-stayed bridge with the largest span in the world. The non-axial force connection is firstly used in the composite cable- stayed bridge. This connection mainly consists of the support system, outer and inner box girders. Based on the FE analysis, the stress distribution, load path and deformation of the non-axial force connection are discussed. The results show that the load on the outer box girder is transferred to the inner box girder by vertical and horizontal supports, so as to complete the transmission of shear force, bending moment and torsion of the cable-stayed bridge at the mid-span. The non-axial force connection presents effective mechanical performance and structural deformation response, which indicates that this connection can reduce the unfavourable longitudinal deformation of the earth- anchored cable-stayed bridge.
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土锚式斜拉桥非轴力连接分析
丹江口水库大桥是目前世界上最大跨径的轻型组合斜拉桥。在组合斜拉桥中首次采用非轴力连接。这种连接主要由支撑体系、外箱梁和内箱梁组成。在有限元分析的基础上,讨论了非轴向力连接的应力分布、荷载路径和变形。结果表明:外箱梁上的荷载通过竖向和水平支撑传递到内箱梁上,从而完成斜拉桥跨中剪力、弯矩和扭转的传递;非轴力连接具有良好的力学性能和结构变形响应,表明这种连接方式可以减小土锚斜拉桥的不利纵向变形。
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