盐渎大桥主桥结构设计与受力分析

Structural Design and Stress Analysis of the Main Bridge of Yandu Bridge

盐城市盐渎大桥主桥为(60.9+105+60.9)m半穿式连续钢桁架结构,桥宽50.5 m。文章介绍了该桥的总体设计、结构设计、静力分析及架设方案,分析得到两片桁的半穿式钢桁架桥型方案较好地解决了超宽桥梁的景观协调性问题;主桁的面内、面外弯矩效应较大是结构受力的一大特点;主桁竖向、横向刚度较大,整体稳定性较好;应用基于无应力状态法的架设方案使结构成桥内力和线形与设计目标一致。

The main bridge of Yandu Bridge in Yancheng City is a(60.9 + 105 + 60.9) m half-through continuous steel truss structure with a bridge width of 50.5 m.This paper introduces the overall design,structural design,static analysis and erection scheme of the bridge.The analysis shows that the half-through steel truss bridge scheme with two trusses solves the problem of landscape coordination of ultra-wide bridges;the large in-plane and out-ofplane bending moment effect of the main truss is a major characteristic of the structural stress;the vertical and lateral stiffness of the main truss is large,and the overall stability is good.The erection scheme based on unstressed state method ensures that the internal force and alignment of the completed bridge are consistent with the design objectives.