组合拱桥混凝土桥面板有效宽度研究

用于拱桥结构中的钢与混凝土组合梁,由于剪力滞效应的存在,同一截面上的混凝土桥面板不能完全相同地参与组合梁的受力。现行的设计规范中没有有关拱桥中组合梁混凝土桥面板有效宽度的规定,这对按梁格法分析组合拱桥的受力带来一定困难。本文结合对一带有连续组合梁的多跨拱桥进行的受力计算,研究了混凝土桥面板的应力在横桥向的分布规律,分析了混凝土桥面板有效分布宽度在纵桥向的变化情况,并讨论了荷载和结构细节变化对混凝土桥面板有效宽度的影响程度。

Studies on Effective Width of Concrete Decks in Composite Arch Bridges

Steel and concrete composite girder has been used in arch bridges recently.Due to the existing of shear lag,the concrete slab stresses in same cross section are not same witli each other.No stipulations for effective width of concrete decks of composite beams in arch bridges are given in current design specifications and codes.So it is difficult in analyzing the mechanical behavior of composite arch bridges by gridiron analogy method.The mechanical behavior investigation for a multi-span arch bridge with continuous composite beams was conducted in this paper.Stress distribution mode of concrete deck in transverse direction and the variation of effective width of concrete in longitudinal direction were studied.The degree of impact of effective width caused by varying loads on structure and by varying some details on structure was discussed.