既有桥梁损伤状态模拟方式和判断标准的探究

Research on the simulation methods and criteria of damage state of existing bridges

以某板梁的挠度试验值作为指导,通过减小混凝土弹性模量或者增大荷载产生的弯矩2种方式增大挠度,对现役桥梁的损伤状态在模拟理论上表明其可行性.采用Midas Fea有限元分析软件实现2种损伤模拟方式,进而以统计学中的确定系数作为模型数据与试验数据相似性的判断标准.用一实例验证试验和模型挠度变化趋势的相似程度,证明加固前后试验值和模拟值可以互为表征,为加固设计检验提供了可能.2种模拟方式对比结果表明,通过对混凝土弹性模量折减模拟损伤状态能够较好反映加固前后梁体的真实状态.

Guided by the test of a beam deflection value,the bending moment decreases the elastic modulus of concrete in the deflection calculation or increase the load generated by the two ways to increase the damage state of bridge deflection,the simulation can be achieved.Two kinds of damage simulation methods are realized by using Midas Fea finite element analysis software.Then the determination factor in statistics is used as the judgment method and criterion for similarity between model data and experimental data.An example is used to verify the similarity between the test and the deflection trend of the model.It is proved that the experimental values and the simulated values before and after the reinforcement can be characterized by each other,and it is possible to reinforce the design test.Two simulation results show that the simulated damage state can reflect the real state of the beam before and after the reinforcement by reducing the elastic modulus of concrete.