Analysis of train-bridge vertical random vibration based on a new point estimate method

被引：0
|
作者：
Liu X. [1 ,2 ]
Jiang L. [1 ,2 ]
Xiang P. [1 ,2 ]
Mao J. [1 ,2 ]
Wei M. [1 ,2 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] National Engineering Laboratory for High Speed Railway Construction, Changsha
来源：
Jiang, Lizhong | 1600年 / Chinese Vibration Engineering Society卷 / 39期
关键词：
New point estimate method; Random parameter; Train-bridge system model;
D O I：
10.13465/j.cnki.jvs.2020.06.003
中图分类号：
学科分类号：
摘要：
In the construction and manufacturing process of railway concrete bridges, the randomness of structural parameters (such as concrete elastic modulus, density, etc. ) inevitably exists, the randomness of passengers and cargo may cause the randomness of train-body, mass, and these randomness cannot be ignored in the random dynamics analysis of train-bridge systems. The model of a train-bridge coupled system was established, and the Newmark-β integral method was used to calculate the first four central moments of random train-bridge dynamic responses based on a new point estimate method which was based on adaptive dimensional decomposition. The results of the comparison with Monte Carlo method show that the new point estimate method can calculate the random response of the train-bridge system efficiently and accurately, and the efficiency is improved by 2-3 orders of magnitude. After obtaining the corresponding first four moments, the probability density function of the response can be fitted by using the cubic normal transformation technique. The method provides a reference to the train bridge limit state design. © 2020, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：15 / 21
页数：6
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