下承式X型双肋拱内倾角度对横向稳定性影响研究

Research on lateral stability influenced by inclined angle of through X-type double ribs arch bridge

运用空间有限元法,分析了下承式X型双肋拱桥各结构参数与合理内倾角度的关系.通过回归方法,得出了下承式双肋拱桥拱肋合理内倾角度的近似表达式.结果表明:对于下承式双肋拱桥,拱肋内倾时能否提高拱的横向稳定性与拱系的宽跨比、横系梁在拱肋切向平面内的抗弯刚度、横系梁的数量等参数有关.当采用合理内倾角度时可有效提高拱的横向稳定性,并取得较好的经济效益.

With spatial finite element method （FEM） analysi arch ribs inclined angle and other structure parameters of thro analyzed. through improve By the reg X-type doubl s, the relationship ugh X-type double ression methods, optimum arch rib inclined angle e ribs arch bridge is gained. The results indicate that between ribs arch optimum bridge is approximate expression of if the inclination of rib can the lateral stability of arch depends on some parameters, such as the width-span the flexural rigidity of cr the reasonable inclined economic benefits can be ossbeams in arch rib tangential plane, and the number of cross ratio beam of S. arch, With angle, the lateral stability of arch can be improved efficiently, and the achieved.