【摘要】：研究目的:隨著鐵路客運(yùn)站規(guī)模的不斷擴(kuò)大,為使站臺的使用空間增加,我國很多鐵路站臺使用無站臺柱式的大跨度雨棚,張弦結(jié)構(gòu)因具有優(yōu)異的受力性能而在無站臺柱式雨棚中有著廣闊的應(yīng)用前景。因此,對服役中的鐵路客運(yùn)站張弦結(jié)構(gòu)損傷狀況進(jìn)行識別、預(yù)測損傷后的極限承載力具有十分重要的意義。研究結(jié)論:(1)建議以頻率變化率FRC_i和正則化頻率變化率NFRC_i作為站臺張弦結(jié)構(gòu)體系的損傷識別參數(shù);(2)建議以NFRC_1作為張弦結(jié)構(gòu)的桁架損傷定位參數(shù),以NFRC_2作為撐桿和拉索損傷定位參數(shù),以FRC_3作為預(yù)應(yīng)力損失識別參數(shù);(3)給出了不同部位損傷后結(jié)構(gòu)模態(tài)參數(shù)FRC_i與相對極限承載力k之間的關(guān)系;(4)本研究結(jié)果可為鐵路站臺張弦結(jié)構(gòu)的損傷識別和極限承載力評估提供參考。
[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.
【作者單位】： 北京交通大學(xué);中國冶金科工股份有限公司;
【基金】：國家自然科學(xué)基金項(xiàng)目(51578558,51108019,51578049) 河北省大型結(jié)構(gòu)健康診斷與控制實(shí)驗(yàn)室開放課題基金項(xiàng)目(201503)
【分類號】：TU317;U291
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本文編號：2324787