双层桥梁门式墩设计分析

Design and Analysis of Portal Piers for Double-deck Bridge

摘要:

随着城市建设用地日趋紧张及城市交通发展的需要，近年来双层桥梁逐渐增多，但双层桥梁门式墩结构受力复杂，与常规下部结构有所不同，需要对其受力特点进行深入分析。基于国内某工程实例，结合有限元计算对该双层桥梁门式墩结构进行受力分析，列举了立柱内力中各荷载占比，从立柱计算长度、下层桥梁支座间距、上层立柱偏心等几个方面阐述了双层桥梁门式墩设计要点，最终确定了截面尺寸，并得出了若干结论，以供国内类似工程的设计参考。

Abstract:

With the increasing scarcity of urban construction land and the demands of urban transportation development, the double-deck bridges have gradually become more prevalent in recent years. However, the force-bearing structures of the portal pier of double-deck bridges are complex and differ from the conventional substructures. It is necessary to carry out the in-depth analysis. Based on a domestic engineering example, the force-bearing analysis of the double-deck bridge portal pier structure is conducted by combining the finite element calculations. The proportion of various loads in the internal forces of the columns is listed. The design essentials of the double-deck bridge portal pier are elaborated from several aspects such as the calculated length of the columns, the spacing between the lower-deck bridge supports, and the eccentricity of the upper-deck columns. Finally, the section dimensions are determined and several conclusions are obtained for reference in the design of similar projects in China.