地裂缝作用下桥梁灾变机理模型试验研究

Test and Research on Mechanism of Bridge Disaster under Ground Fissure

地裂缝作为一种典型的地质灾害会导致桥跨结构及桥梁附属设施的变位与破坏,缩短桥梁的使用寿命。通过在试验场地进行的桥梁跨越地裂缝结构模型试验,利用沉降平台模拟地裂缝活动,探讨了地裂缝影响下的桥梁灾变机理,采用ANSYS有限元软件对地裂缝作用下的桥梁的受力及变形情况进行数值模拟,并与模型试验结果进行对比,确定了地裂缝作用下应力应变特征及受力模式,为地裂缝作用下桥梁结构设计提供了科学依据。

Ground fissure is a kind of typical geological disaster which will cause the displacement and damage of bridge and bridge facilities, and shorten the service life of the bridge. Through structural model test of bridge spanning ground fissure, the bridge disaster mechanism is discussed under the influence of ground fissure simulating ground fissure activities by settlement platform. Numerical model of ground fissure and bridge is built by the ANSYS finite element software, the stress and strain of bridge structure under the fissure influence are analyzed through numerical calculation. With the comparison of the model experiment＇s result, it draws a conclusion that the stress strain characteristics of the bridge under the influence of ground fissure belts and the bridge＇s stress pattern, which provides the scientific basis for the design of bridge structure under the action of ground fissure.