钢管混凝土拱桥的拱肋稳定性可靠度分析

Reliability Analysis of the Arch Rib Stability ofConcrete Filled Steel Tubular Bridge

介绍了钢管混凝土拱桥的拱肋在稳定性失效模式下功能函数的建立方法。作为分析算例,建立了丫髻沙大桥在某工况下主拱拱肋5个典型截面的功能函数。用JC法、图解渐近法和波动探寻法对其进行了可靠度分析,并将三种方法的计算过程和结果借助图形加以显化。计算结果表明,拱肋稳定性是足够安全的。

Based on the arch rib of concrete filled steel tubular bridge, the method for constructing performance function of stability failure mode is discussed in this paper. At Yajisha Bridge, which is considered as an analytical example, five performance functions corresponding to the five typical arch rib sections are constructed for a given case. Reliability analyses about five functions are performed by JC method, diagrammatical approximation and fluctuation pursuit algorithm, and the calculating processes of the three method and algorithms are plotted and demonstrated as well. The results show that the arch ribs are safe enough to keep excellent stability.