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（北京交通大學(xué)土木建筑工程學(xué)院， 北京 100044）

［摘要］以實(shí)際工程為背景，通過(guò)結(jié)構(gòu)精細(xì)化建模，在索穹頂結(jié)構(gòu)中建立多根環(huán)索，研究索穹頂結(jié)構(gòu)的靜力性能及環(huán)索內(nèi)力分布規(guī)律。對(duì)使用荷載狀態(tài)下的環(huán)索，提出系統(tǒng)的建模方法，進(jìn)行環(huán)索彎曲工況的數(shù)值模擬分析，得到環(huán)索控制截面索絲應(yīng)力的不均勻分布規(guī)律。同時(shí)考慮初始應(yīng)力比、彎曲角度以及索絲不同層數(shù)等因素，對(duì)彎曲工況下的環(huán)索進(jìn)行參數(shù)化分析，研究環(huán)索應(yīng)力不均勻分布的規(guī)律。研究結(jié)果表明：在使用荷載狀態(tài)下，環(huán)索內(nèi)力從內(nèi)到外均勻增加； 彎曲工況下索絲應(yīng)力不均勻分布現(xiàn)象相對(duì)于直拉工況更加顯著，故彎曲工況下應(yīng)將環(huán)索初應(yīng)力放大1.7～2倍； 環(huán)索截面不均勻程度隨索力增加而減弱，隨索絲層數(shù)增加而增強(qiáng)，環(huán)索應(yīng)力不均勻性隨彎曲角度增加而增加。

［關(guān)鍵詞］索穹頂結(jié)構(gòu)； 環(huán)索； 建模方法； 彎曲工況； 應(yīng)力分布規(guī)律； 參數(shù)化分析

中圖分類號(hào)：TU312，  TU318文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)23-0051-07

Stress distribution law of ring cable wires at cable pinch node in cable dome structure

YANG Weiguo, WANG Ya, WANG Xin, WANG Meng, LIU Pei

(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

Abstract:Taking actual engineering as the background, multiple ring cables in the cable dome structure were established according to the refined structural modeling. The static force performance of the cable dome structure and the inner force distribution law of the ring cable were researched. Under applied load, the system modeling method was proposed to simulate the cable bending condition and the stress uneven distribution law of cable wire in the control section of ring cable was obtained. Parameterization analysis was studied considering the initial stress ratio, bending angle and the number of different layers of cable wire, and the stress uneven distribution law of ring cable. The results show that: under applied load, the internal force of the ring cable increases evenly from inside to outside; under bending condition, the stress uneven distribution of cable wire is more significant than that of cable wire under straight condition, so the initial stress of ring cable should be enlarged by 1.7～2 times; the inhomogeneity of ring cable section decreases with the increase of cable force and increases with the increase of cable wring layer, the stress inhomogeneity of ring cable increases with the increase of bending angle.

Keywords:cable dome structure; ring cable； modeling method; bending condition; stress distribution law; parameterization analysis

*國(guó)家自然科學(xué)基金（51578046）。

作者簡(jiǎn)介：楊維國(guó)，教授，博士生導(dǎo)師， Email: wgyang1@bjtu.edu.cn； 通信作者：王亞，博士研究生，Email: wangya_73@163.com。