伏拱对赵州桥力学行为的影响

采用数值计算的方法分析了赵州桥上的两对伏拱对桥身拱轴线形状及拱券应力分布的影响，一方面阐明了伏拱的存在使桥体的圆弧形拱轴线与符合力学原理的恒载压力线十分接近，另一方面，说明伏拱的存在明显消除了桥体拱券中的拉应力，加强了桥体的安全性，从而对这座千年古桥的卓越力学性能有了进一步的认识。

INFLUENCE OF SHOULDER-ARCH UPON STRUCTURE STRENGTH OF ZHAOZHOU BRIDGE

Numerical computational method is employed to analysis the influence of shoulder-arch upon the style of arch-axis line and stress distribution in the bridge body. Through computation and contrast, we can safely conclude that on the one hand, original archaxis line matches well with the permanent-loaded compression line because of the shoulder-arch, on the other hand, the existence of shoulder-arch weakens the internal tensile stress and reinforces the sta- bility of the bridge body greatly.