基于模态参数的铁路站台张弦结构损伤识别
发布时间：2018-11-11 12:05
【摘要】：研究目的:随着铁路客运站规模的不断扩大,为使站台的使用空间增加,我国很多铁路站台使用无站台柱式的大跨度雨棚,张弦结构因具有优异的受力性能而在无站台柱式雨棚中有着广阔的应用前景。因此,对服役中的铁路客运站张弦结构损伤状况进行识别、预测损伤后的极限承载力具有十分重要的意义。研究结论:(1)建议以频率变化率FRC_i和正则化频率变化率NFRC_i作为站台张弦结构体系的损伤识别参数;(2)建议以NFRC_1作为张弦结构的桁架损伤定位参数,以NFRC_2作为撑杆和拉索损伤定位参数,以FRC_3作为预应力损失识别参数;(3)给出了不同部位损伤后结构模态参数FRC_i与相对极限承载力k之间的关系;(4)本研究结果可为铁路站台张弦结构的损伤识别和极限承载力评估提供参考。
[Abstract]:Research purpose: with the continuous expansion of railway passenger station scale, in order to increase the use space of platform, many railway platforms in China use long-span rain shed without platform column type. Zhang Xian structure has a broad application prospect in the platform-no-column rain shed because of its excellent mechanical performance. Therefore, it is of great significance to identify the structural damage of Zhang Xian in the railway passenger station and predict the ultimate bearing capacity after the damage. The conclusions are as follows: (1) the frequency change rate (FRC_i) and regularized frequency change rate (NFRC_i) are suggested as the damage identification parameters of platform Zhang Xian structure system; (2) it is suggested to take NFRC_1 as the damage location parameter of Zhang Xian structure, NFRC_2 as the damage location parameter of braces and cables, and FRC_3 as the identification parameter of prestress loss; (3) the relationship between the structural modal parameter FRC_i and the relative ultimate bearing capacity k after different site damage is given. (4) the results of this study can provide a reference for the damage identification and ultimate bearing capacity evaluation of the Zhang Xian structure of railway platform.
【作者单位】： 北京交通大学;中国冶金科工股份有限公司;
【基金】：国家自然科学基金项目(51578558,51108019,51578049) 河北省大型结构健康诊断与控制实验室开放课题基金项目(201503)
【分类号】：TU317;U291
，
本文编号：2324787
[Abstract]:Research purpose: with the continuous expansion of railway passenger station scale, in order to increase the use space of platform, many railway platforms in China use long-span rain shed without platform column type. Zhang Xian structure has a broad application prospect in the platform-no-column rain shed because of its excellent mechanical performance. Therefore, it is of great significance to identify the structural damage of Zhang Xian in the railway passenger station and predict the ultimate bearing capacity after the damage. The conclusions are as follows: (1) the frequency change rate (FRC_i) and regularized frequency change rate (NFRC_i) are suggested as the damage identification parameters of platform Zhang Xian structure system; (2) it is suggested to take NFRC_1 as the damage location parameter of Zhang Xian structure, NFRC_2 as the damage location parameter of braces and cables, and FRC_3 as the identification parameter of prestress loss; (3) the relationship between the structural modal parameter FRC_i and the relative ultimate bearing capacity k after different site damage is given. (4) the results of this study can provide a reference for the damage identification and ultimate bearing capacity evaluation of the Zhang Xian structure of railway platform.
【作者单位】： 北京交通大学;中国冶金科工股份有限公司;
【基金】：国家自然科学基金项目(51578558,51108019,51578049) 河北省大型结构健康诊断与控制实验室开放课题基金项目(201503)
【分类号】：TU317;U291
，
本文编号：2324787
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