基于自振频率的旧简支梁桥整体刚度折减研究

以梁振动理论为基础，建立了梁频率与刚度的关系，并在其中引入了简支梁桥整体刚度折减系数，再通过求解该系数来定量地评价简支梁桥由于病害引起的刚度变化情况。以一座旧简支梁桥为例，通过计算旧桥整体刚度折减系数，对桥梁进行了定量的评价，同时从一般检测理论出发，对桥梁进行了定性的安全评估。结果表明，虽然从定性评价来看该桥是安全的，但是从定量评价来看该桥的刚度折减系数较大，病害严重。

Whole Stiffness Reduction Study of Old Simple Supported Girder Based on Biberation

Taking the beam vibration theory as a foundation,the paper established the relationship be-tween frequency and stiffness of the beam,introduceing the whole stiffness reduction coefficient of the simple supported girder bridge,and then quantitatively evaluating the old simple supported girder bridge because of all sorts of diseases by solving the coefficient.With an old simple supported girder bridge as an example,the safety of the bridge has evaluated quantitatively by calculated the coefficient and evaluated qualitatively by the general testing theory.The calculation results shows that although the bridge is safe form the qualitative evaluation,but the bridge＆#39;s stiffness reduction coefficient is big-ger from the quantitative evaluation,therefore,the bridge disease is serious.