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| BEARING CAPACITY OF THE COMPRESSION BAR WITH INITIAL DEFLECTION UNDER AXIAL UNIFORMLY DISTRIBUTED LOADS |
| DUAN Shu-Jin1, MA Xiao2 |
| 1 School of Civil Engineering, Shijiazhuang Railway Institute; 2Hebei Normal University |
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Abstract Lattice form assembled structure has rather large initial geometric deflection that brings influence to its structural mechanical proprieties. The linear elastic theory can be used as a basis to judge the safety of perfect slender bar. But the critical load of lattice column obtaining from linear stability analysis is generally high. The corresponding critical stress is usually higher than the ultimate strength of material. So the critical force of linear buckling theory is not suitable to be as the safety design standard of such engineering structures. A compression bar bearing axial uniformly distributed load (containing self-weight) is studied in this paper. Considering the initial geometric deflection, the deflected curve is got by power-series solution. Furthermore, the theoretical ultimate load is obtained based on the yielding criterion of the cross-sectional edge stresses. The obtained bearing capacity is lower than the critical load by the linear stability theory for the engineering structures in practice so that the present work can be as the basic theory to the structural safety designs.
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Received: 10 June 2005
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[1]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社， 1992．
[2]李寿英.销接钢结构的承载力与有限元分析[D].石家庄:石 家庄铁道学院，2002.
[3]张晓敏，张培源，彭向和.初应力位形上小的变形问题[J].工 程力学，2003, 20(3):125-128.
[4]段树金，梁智垚，马肖.六四梁拼组柱承载力计算探讨[J].国 防交通工程与技术，2003,1(3):27-29.
[5]刘光栋，罗汉泉.杆系结构稳定[M].北京:人民交通出版社， 1988．
[6]张平占.BHA受压失稳的模型际及临界钻压公式[J].煤田 地质与勘探,1995 , 23(5):59-62.
[7]何畅，向仲富.具有初始缺陷的高桥墩非线性稳定分析[J]. 重庆交通学院学报，2003,22(3):14-17.
[8]张家旭.钢结构[M].北京:中国铁道出版社，1996.
[9]段树金，李云峰.关于应急拼组工程结构的设计计算[J].工程 力学，1998,(增刊):532-535.
[10]王贺轩，彭兴山.六四式铁路军用梁组墩的试验研究[J].铁道 建筑，1997 (6):15-19.
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2005, Vol. 22 
