下承式X型双肋拱内倾角度对横向稳定性影响研究

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.

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

With spatial finite element method(FEM) analysis,the relationship between optimum arch ribs inclined angle and other structure parameters of through X-type double ribs arch bridge is analyzed.By the regression methods,optimum arch rib inclined angle approximate expression of through X-type double ribs arch bridge is gained.The results indicate that if the inclination of rib can improve the lateral stability of arch depends on some parameters,such as the width-span ratio of arch,the flexural rigidity of cros...