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通过有限元软件对水土嘉陵江大桥的分析结果表明,按新规范的规定将预应力度降低20%,进行恒载比重较大的大跨径预应力混凝土桥梁结构的设计时,所需钢束面积较旧规范将有所增加,由此对箱形截面的有效面积将产生更大的削弱作用和引起预应力孔道周围更加严重的应力集中问题,降低了主梁的承载能力,影响了结构的安全可靠性。通过采用体内外混合配束技术,改善预应力钢束配置增多给桥梁结构带来不利影响的同时,控制了连续刚构桥箱梁斜裂缝和跨中下挠等病害的产生,实现了箱梁上部结构的优化设计,取得了较好的经济效益。
The analysis results of Jialing River Bridge by using finite element software show that the design of long-span prestressed concrete bridge structures with large deadweight and large load when the prestressing force is reduced by 20% The older specifications will increase, which will have a greater effect of weakening the effective area of the box section and causing more severe stress concentration around the prestressed tunnel, reducing the carrying capacity of the main girder and affecting the structural safety reliability. Through the use of in-vitro and in-vitro mixing and bundling technology to improve the prestressed steel beam configuration to increase the adverse impact on the structure of the bridge at the same time, to control the continuous rigid frame bridge box girder oblique cracks and midspan and other diseases, the realization of the box girder The optimal design of the superstructure has achieved good economic benefits.