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Preventing the fall of skew and curved bridge decks during earthquake and predicting the pounding response

防止地震期间斜桥面和曲线桥面的倒塌并预测冲击响应

基本信息

批准号：
12650479
负责人：
IJIMA Katsushi
金额：
$ 2.37万
依托单位：
SAGA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650479/
关键词：
Bridge Seismic proof design Deck pounding Preventing deck fall skew bridge Curved bridge Pounding experiment Response prediction 衝突振動

项目摘要

During the Hyougo-Ken-Nanbu earthquake in 1995 and Northridge earthquake in 1994, many decks in skew and curved bridges collapsed. The research dealt with preventing the fall of deck structures by the means of supporting the bridges by rubber bearings and permitting pounding between the decks and the abutments. The crucial point in the research is to clarify the pounding phenomena and the result can predict damage level of deck ends and abutments and can verify the possibility of the proposed means.From the simulation analyses and the experiments, the research indicated that the pounding between deck and the abutments is a chaos phenomenon but has similarity between the three quantities of input intensity, clearance and response of a deck. Particularly, the clearance is most dominant in determining the maximum response and frequency characteristics of a deck and earthquake wave do not much influence the response.Since pounding of a deck is a chaotic phenomenon, time history of the response is not reliable but the maximum is rather important in an engineering viewpoint. Even if the response is chaotic, the maximum is governed by energy principle and is predicable. Therefore, the study proposes a predicting equation that satisfies the similarity between the three quantities. When comparing the predicting equation with simulated results and experimental results, the equation well agrees with them. Hence, the predicting equation can estimate the damage level of deck end and abutment during earthquake and can verify the effectiveness of shock absorber developed without simulating the pounding by using complicated model of collision.

在1995年兵库县南部地震和1994年北岭地震期间，许多斜弯桥的桥面倒塌。该研究涉及通过橡胶支座支撑桥梁并允许桥面与桥台之间发生碰撞来防止桥面结构坠落。研究的关键是弄清碰撞现象，其结果可以预测桥面和桥台的损伤程度，验证所提出方法的可行性。仿真分析和试验研究表明，桥面和桥台之间的碰撞是一种混沌现象，但输入强度、间隙和桥面响应三个量之间具有相似性。特别是，在确定最大响应和桥面的频率特性方面，间隙是最主要的因素，地震波对响应的影响不大。由于桥面的碰撞是一种混沌现象，所以响应的时间历程不可靠，但从工程观点来看，最大值是相当重要的。即使响应是混沌的，最大值也是由能量原理决定的，并且是可预测的。因此，本研究提出了一个预测方程，满足三个量之间的相似性。将预测方程与模拟结果和实验结果进行比较，两者吻合较好。因此，预测方程可以估计在地震过程中的甲板端部和桥台的损坏程度，并可以验证减震器的有效性，而无需模拟碰撞，通过使用复杂的碰撞模型。