地震载荷作用下岸桥结构单参数畸变相似模型研究

发布时间：2018-01-11 18:27

本文关键词：地震载荷作用下岸桥结构单参数畸变相似模型研究　出处：《振动与冲击》2014年20期 　论文类型：期刊论文

【摘要】：据动力相似理论设计合理的缩尺模型,用振动台模型对岸桥结构进行动力学试验分析。设计中的缩尺模型各构件(梁)长度可基于原形尺寸由相似比尺推导获得,而梁截面厚度却不能与长度按同一比尺缩小,致使模型产生畸变。采用有限元预测系数法获得畸变模型的动响应预测系数从而可预测原型的动态特性。为验证用该方法所得预测系数的有效性,以相似理论制作缩尺模型并使截面厚度产生畸变,对畸变模型进行锤击模态及地震振动台试验分析。结果表明,试验结果与有限元计算结果相近,结构发生最大加速度、应变位置相似,表明畸变预测系数合理。
[Abstract]:According to the dynamic similarity theory, a reasonable scale model is designed. The vibration table model is used to analyze the dynamic test of the coastal bridge structure. The length of each component (beam) of the scale model in the design can be derived from the similarity scale based on the original size. However, the thickness of beam section can not be reduced by the same scale as the length. The finite element prediction coefficient method is used to obtain the dynamic response prediction coefficient of the distortion model so that the dynamic characteristics of the prototype can be predicted. In order to verify the validity of the prediction coefficient obtained by this method. The model of scale is made by similarity theory and the thickness of section is distorted. The test results of hammering mode and seismic shaking table show that the experimental results are close to those of finite element method. The maximum acceleration occurs and the strain position is similar, which indicates that the distortion prediction coefficient is reasonable.
【作者单位】：武汉理工大学物流工程学院;
【基金】：国家自然基金资助项目(51275369)
【分类号】：U653.921
【正文快照】： 岸桥结构大型化使其更易遭受地震破坏,明确岸桥结构地震载荷作用下的破坏模式及破坏机理,提高岸桥结构抗震性能,为大型起重设备设计及安全使用急需解决之问题[1]。岸桥结构庞大以致无法对实际结构进行抗震试验。模型试验可填补此振动试验空白。采用适当材料制作与实际结构几何

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