简支梁振动测试原理与试验分析

Dynamical Testing Principle and Experiment Anlaysis on the Simple-support Beam

通过测试混凝土简支梁的自振频率,推导得出混凝土简支梁的等效抗弯刚度,进而计算出该梁在外荷载作用下的挠度,并与设计以及相关的规范进行比较,以对简支梁的工作性能进行评估,从而验证该片梁的工作性能。对两片简支梁的动力特性进行了测试,并和静载试验的结果进行了比较和分析,二者符合情况良好。这表明采用既经济又简便的振动测试方法来检验简支梁的抗弯工作性能是可行的。

We can infer the equivalent rigidity of simple-support beams by test it＇s base frequency. So we can calculate the deflection of the simple-support beam when it is loaded in the middle. We can evaluate the bear capability of the simple-support beam by comparing it with correlative national criterion. There are two examples in the text in order to compare the result between the dynamical test and statics test. The result show that they agree with each other well. This indicated that the simple and economical way can be used in the test of the bear capacity of the simple-support beam.