石拱桥的有限弹簧法分析及其安全性评价

ANALYSIS FOR FINITE SPRING METHOD OF STONE ARCHED BRIDGE AND ITS SAFETY EVALUATION

依据计算几何学的分割理论,开发了对石拱桥进行任意形状单元划分的计算机前处理系统,提出了用有限弹簧法模拟石拱桥力学性能的计算方法。其特点是能够把石拱桥的拱圈看成个别石材块体构成的不连续体,考虑拱圈随着偏心压缩而引起的石材块体间开口变形的同时,也考虑拱背填料和拱圈的相互作用及其它的荷载分散效果。数值模拟了多跨石拱桥在分布活荷载及其水平地震荷载作用下的力学性能,并进行了安全性评价。

Based on the segmentation theory of mathematical geometry, a processing system in front of computer for dividing the stone arched bridge into arbitrary shaped elements is developed, moreover, a computing means using the finite spring method to simulate the mechanical properties of stone arched bridge is presented. The leading features are that the arch ring of stone arched bridge can be modeled as a non-continum which is composed of individual stone voussior elements; while considering on the open-deformation between stone voussior elements due to eccentric compression in arch ring, at same time, the interaction between spandrel filling and arch ring as well as the dispersion effects of the loadings should be taken into account too. Using numerical value, the mechnical properties of a multi-span stone bridge under distributed live load and horizontal seismic action are simulated, and its safety evluation is carried on.