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狗万要实名制
高速铁路桥隧搭接结构地震响应振动台试验方法研究
作者:孙广臣1 2 何山3 傅鹤林1 谢佳佑2 江学良2 郑亮4 
单位:1. 中南大学 土木工程学院, 湖南 长沙410075; 2. 中南林业科技大学 土木工程学院, 湖南 长沙410007;3. 湖南交通职业技术学院 建筑工程学院,湖南 长沙410004; 4. 高速铁路建造技术国家工程实验室, 湖南 长沙410075
关键词:软弱围岩  桥隧搭接  振动台  地震响应  试验方法 
分类号:
出版年·卷·期(页码):2019·41·第1期(117-125)
摘要:

振动台模型试验是目前研究复杂结构抗震能力与破坏机理的重要手段之一。为揭示软弱围岩与桥隧搭接结构各部位在地震作用下的动力响应特点、累积损伤效应及动力灾变行为的产生机理和宏细观特征,在考虑不同地震动参数对桥、隧结构动力特性影响的基础上,依据相似理论和模型试验技术,结合既有工程实例开展了高速铁路桥隧搭接结构地震响应振动台模型试验方法研究。同时,分析桥隧搭接振动台模型试验方法的特点,介绍了试验平台及测试方法。试验初步结果表明,提出的试验方法可较好地模拟软弱围岩条件下桥隧搭接结构在地震作用下的动力响应及灾变行为,是一种行之有效且重复可操作性强的试验方法,可供今后同类试验参考。

Shaking table model test is one of the most important methods to study the seismic capacity and failure mechanism of complex structures. In order to reveal the dynamic response characteristics,狗万要实名制     the induced mechanism, macro or micro characteristics of dynamic responses, cumulative damage effects and dynamic disaster behaviors of the key parts of bridge and tunnel lapped structures in soft or weak surrounding rocks under seismic action, the shaking table test model method of such complex structures in high speed railway was worked out according to the similarity theory and model test technology combined with existing engineering examples in this paper, considering influences to the dynamical characteristics of the tunnel and the bridge structure caused by different ground motion parameters. At the same time, the characteristics of the shaking table model test method for bridge and tunnel lapped structure were analyzed and compared with other research methods, along with the test platform and test methods being introduced. Preliminary test results show that the proposed method can well simulate the seismic dynamic response, damage and catastrophic behavior of bridge-tunnel lapped structure under the condition of weak surrounding rock., which is an effective and operable test method as reference for future similar tests. Analyses and discussions of test results will be written in another paper.

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