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用强度失效的解析法研究了横向载荷和初始挠度对梁柱结构稳定性的影响,提出预拱度可以有效抵制横向载荷对结构稳定性的不利影响.在此基础上,通过解算横向载荷与初始挠度对梁柱稳定性的影响系数,即计算综合因子n的取值范围,解决了强度稳定综合理论方法预测结构稳定性的部分难题.最后用该方法对某船的甲板纵桁的稳定性进行了解算.结果可看出:横向载荷和初始挠度对纵桁这种刚性较强的构件的极限强度影响不大.
The influence of transverse load and initial deflection on the stability of beam-column structure is studied by the analytic method of strength failure. It is suggested that the pre-camber can effectively counteract the adverse effect of transverse load on the structural stability. On this basis, The influence factor of the initial deflection on the stability of the beam and column, that is to say, the range of the comprehensive factor n is calculated, which solves some of the difficulties in predicting the structural stability of the stability analysis method.Finally, this method is used to analyze the stability of deck girders of a ship The results show that the transverse load and the initial deflection have little effect on the ultimate strength of the rigid members such as stringers.