杭州市运河二通道桥大截面钢箱拱合理断面设计研究

Study on Reasonable Section Design of Large-section Steel-box Arch for Canal No.2 Bridge in Hangzhou City

全焊钢箱拱在桥梁设计的应用中,通常采用密布横向隔板并配合纵向加劲来保证钢箱拱截面的局部稳定性,但随着跨度的增加,钢箱拱截面尺寸的放大,对横向隔板的刚度需求也不断增加,传统的空腹式横向隔板的用钢量显著增加,进而影响到整个拱的经济性。针对这个问题,在大截面钢箱拱的断面布置上,对空腹式隔板、框桁混合型隔板以及增设中间纵隔板几个方案进行受力性能、构造、经济上的比较,可为以后大截面钢箱拱的设计提供参考。

In the application of full-welded steel-box arch in the bridge design,the dense transverse clapboards with longitudinal stiffeners are usually used to ensure the partial stability of the steel-box arch section.However,with the lengthening of spans and the increment of steel-box arch sectional sizes,the rigidity demand of transverse clapboard will also continuously increases,and the steel material expenditure of the traditional no-web transverse clapboard is obviously increased,which will influence the economy of the whole arch.Aiming at this problem,several schemes of no-web transverse clapboard,frame-truss combined clapboard and medium longitudinal clapboard are compared in the stress performance,structure and economy,which can provide the reference for the design of large-section steel-box arch.