【摘要】 压杆是房屋和桥梁结构的重要受力构件。当压杆所承受的荷载达到一定的临界值时,整个结构就会失去稳定性。该文根据精细传递矩阵法原理和压杆微弯平衡状态下的微分平衡方程,建立了在轴向荷载作用下压杆稳定分析的精细传递矩阵式。并运用精细传递矩阵法对不同边界约束的压杆进行了临界荷载的计算,计算结果与压杆屈曲的理论解基本一致,从而验证了该文方法是正确、有效的。算例表明:轴心受压杆件的屈曲荷载的增幅逐阶递增。建议采取措施以避开压杆的低阶屈曲荷载,从而可以有效的提高压杆的承载能力,充分发挥材料的性能。更多还原

【Abstract】 Compression bar is an important structural member in buildings or bridges.When the compression of the bar reaches its critical load,the whole structure will lost the stability.Based on the theory of precise transfer matrix method and the slightly bending differential equation of compression bar,a precise transfer matrix format for buckling analysis of compression bar under axial load was derived.By this method,the critical loads of compression bar with different boundary constraints were calculated,and the calculation result agreed well with the theoretical result,showing that the method was accurate and effective.Examples showed that the amplification of critical loads of center compression bar increases with modes,so the design of center compression bar should avoid the occurrence of low mode buckling.更多还原