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| 铁路矮塔斜拉T构桥结构设计方法实例研究
摘要：本文以渝（重庆）黔（黔江）铁路长途河大桥为工程背景，综合考虑桥址地形地质、桥梁跨度、净空及受力特点等要求，提出了主桥采用(132+132) m 的矮塔斜拉T构桥型总体设计方案，并采用数值模拟方法分析了拉索布置范围、索间距对梁部内力、刚度影响规律。结果表明：(1)斜拉索靠近主塔布置、适当加密索间距有利于减小梁部负弯矩峰值，对梁体受力更为有利；(2)综合考虑拉索对结构受力和梁体刚度的影响，依托工程无索区梁端及塔根无索区分别取为30m和38m、索间距按8m设置。最后，通过开展斜拉索对矮塔斜拉T构桥结构受力的影响分析，探讨了矮塔斜拉T构桥型的适用性。
关键词：铁路桥梁；矮塔斜拉T构；数值计算；结构设计；适用性
Abstract: Taking the Changtuhe Bridge in Chongqing-Qianjiang railway as engineering background, comprehensive consideration of bridge site topography and geology, the bridge span, clearance and mechanical characteristics, a scheme of low tower cable-stayed T-bridge with (132 + 132) m girder was advanced. And then, the change law of the scope of cable layout, line spacing against to the stiffness and internal force of beam was studied by numerical simulation method. The results show that the arrangement of the stay cables near the main tower and the proper spacing of the infill cables are conducive to reducing the negative moment peak of the trabeculae, and the stress on the beam is more favorable. Comprehensively considering the influence of cable on the structural force and the stiffness of the beam, the cable-free area at the beam end and tower root of the project was taken as 30 m and 38 m respectively, and the cable spacing was set as 8m as the optimal design parameters. Finally, the applicability of the low-tower T-bridge is discussed by analyzing the contribution of the stay cables to the structural forces.
Keywords Railway bridges; Low-tower cable-stayed T-bridge; Numerical calculation; Structural design; Applicability
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