输煤皮带通廊桥架抗震性能分析

1.西安科技大学 建筑与土木工程学院,陕西 西安 710054; 2.南宁市建筑设计院,广西 南宁 530012

输煤桥架; 钢结构; 模态分析; 反应谱

Seismic performance analysis of coal belt-conveyor bridge
CHEN Shao-jie1,REN Jian-xi1,DENG Bo-tuan1,ZHANG Kun1,PAN Zhen-jun2

(1.College of Civil and Architectural Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Nanning Architectural Design Institute,Nanning 530012,China)

coal handling bridge; steel structure; modal analysis; response spectrum

DOI: 10.13800/j.cnki.xakjdxxb.2016.0117

备注

输煤皮带通廊桥架结构在历次的地震中破坏较多,为了研究其动力特性和抗震性能,提高结构的寿命和安全性,利用SAP2000有限元软件,对工程中常见的3种结构形式的输煤皮带通廊桥架结构进行了模态及水平地震响应分析,结果表明:前三阶振型对桥架结构的影响较大,但高阶振型时桥架上部错动变形明显,计算中高阶振型不能忽略; 桥架的最大位移均发生在跨中,三角腹杆和下斜腹杆桥架在地震作用中变形幅度接近,均大于加吊杆式桥架; 受到下拉吊杆的影响,桥架端部下弦杆内力增大明显,采用该布置形式时应对端部下弦杆进行加强。

Coal belt-conveyor bridge structures are usually damaged a lot under seismic activities.In order to study the dynamic characteristics and anti-seismic performances of the structures,and to improve the service life and security of the structures,the authors performed modal and horizontal seismic responses analyses of the three structure types of coal belt-conveyor bridge structures with finite elements software SAP2000.The result showed that:the first three modes of vibration had great impact on the bridge structure,however,the higher mode effect cannot be ignored during calculation as the upper part of the bridge would suffer obvious dislocation and deformation.The maximum displacement normally occurred to the mid span of the bridge.During seism activities,the triangle web member as well as the declivitous non-suspender type of bridge had greater extent of deformations compared to the declivitous suspender type of bridge.Affected by the declivitous suspender,the internal force of the lower chords was significantly increased at the end of the bridge.In such cases,the lower chords should be reinforced.