铁路钢桁梁桥计算中几个问题的探讨  

Study on Several Calculation Problems in Railway Steel Trussed Girder Bridge

作　　者：冯沛[1] 李凤芹[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300142

出　　处：《铁道标准设计》2013年第3期53-56,共4页Railway Standard Design

基　　金：铁道部科技研究开发计划项目(2011G012-A)

摘　　要：结合铁路钢桁梁桥的设计,对运用现行铁路钢桥设计规范进行杆件检算中遇到的问题进行探讨。通过研究分析认为,考虑次应力时容许应力提高系数的选取应该对于不同的杆件、杆件强度检算和总体稳定检算时区别对待;推导出了基于杆件活载和恒载应力比的活载发展均衡系数的计算公式;给出了两个主平面受弯时杆件总体稳定计算的公式及杆件总体稳定计算时,两端固结梁φ2的计算方法。In combination with the design for a steel trussed girder bridge, several problems in the use of current Code for Design on Steel Structure of Railway Bridge for calculating the members are studied and discussed in this paper. Through analysis method, the author thinks that when the secondary stress is considered, the allowable stress increase factors should be selected differently according to different member, different member strength calculation and overall stability calculation. Then through deducing method, the computational formula of live load balanced development coefficient based on live-dead loads stress ratio is given in this paper. Further, overall stability computational formulas of the member bending within the two principal planes are also given tentatively. Also, the calculation method of the value ~2~f the beam with two fixed ends in the process of overall stability calculation is given.

关 键 词：铁路桥 钢桁梁 次应力 容许应力提高系数 活载发展均衡系数 总体稳定 

分 类 号：U448.36[建筑科学—桥梁与隧道工程]