基于有机玻璃简支梁桥模型的动载试验研究

Dynamic Load Experimental Study Based on Simple-supported Plexiglass Beam Bridge Model

随着交通车辆的迅速增长,车辆行驶速度和载重量的较大提高,对公路桥梁的安全性能产生了较大的影响.运用相似理论,参照杨梅洲大桥建立了1∶10的有机玻璃简支梁桥模型,验证了模型的有效性;分别以不同的车速和载重量对模型的跨中应变进行动态测试,通过对采集数据的分析,得出以下结论:模型跨中动、静应变随荷载增加而线性增加;静应变比动应变略大;在一定的速度范围内,动应变与小车行驶速度关系不大.

As the quantity, running speed, payload of transportation vehicle increase quickly, it has great effects on safety performance of the highway bridge . Based on the similarity theory, this paper builds 1. 10 simple-supported plexiglass beam bridge model referring to Yang Mei Zhou Bridge, and testifies the va- lidity of the model. The model dynamic strain measurements on the midspan has been conducted at different speeds and loads. By analyzing the data acquired, we come to the conclusion that the model dynamic and static strain are roughly proportional to increasing load. Furthermore, static strain is slightly larger than the dynamic strain; within a certain speed range, the model dynamic deflection on the midspan and speed of vehicle model is not directly related.