钢质渡河桥梁结构弹性失效预测的应变监测法

Forecast for Elastic Failure of Steel Bridge and Pontoon Structures with the Method of Surveilling Strain

鉴于渡河桥梁结构必须具备重复使用的特点,其设计范围仅涉及弹性理念,因此必须对服役渡河桥梁装备结构的弹性失效进行预测。根据钢质材料拉伸的真实应力—应变曲线中材料弹性极限的几何特性,采用应变监测法来预测结构的弹性失效荷载。为了保证结构的弹性设计理念,认为只要有一测点发生弹性失效,则认为该结构已经发生弹性失效。对某一类型的钢质桥面板在不同类型的荷载作用下应用实例的结果表明,结构失效荷载与作用于其上的荷载类型有关。

With the elastic scope of design for bridge and pontoon structures which are used continually,it is necessary for the structures to be forecasted when their elasticity is invalid.The method of surveilling strain is presented to forecast invalidation on the base of the geometrical characteristic of elastic high-point in true stress-strain curves of pulling-steels tests.In order to ensure the elastic scope of design,a structure is considered to be invalidated in elasticity while only one reference point is invalid.The results of the example of a type of steel-bridge-floor plate subjected by different loads indicate that elastic-invalidation loads have a close relationship with the types of loads.