摘要
为了确定桥梁结构设计中阶形桥墩柱的计算长度,推导出阶形柱屈曲方程的递推公式;将周围墩柱对计算柱的侧向约束用一柱顶弹簧表示,并推导出在此边界条件下阶形柱的临界荷载特征方程;通过编程和Sap2000有限元建模,对一典型实例进行了数值分析;结果表明,编程计算结果与Sap2000模拟结果几乎完全一致;柱顶弹簧刚度是影响阶形柱计算长度的重要影响因素,而一般可忽略剪切变形对计算长度影响;中间各段的计算长度系数一般大于上下两端的计算长度系数.
In order to determine the effective lengths of stepped piers in the design of bridge structures, the recursive buckling equations for such members were derived. With the lateral restraining effect of the surrounding piers on the concerned pier taken as a spring at its top, the characteristic equation for its critical load was formulated. A program was written for the numerical solution of a typical example, which was modeled in commercial finite element software package Sap2000. The result indicates that solutions from the program analysis were almost the same as those of the model in Sap2000 ; the stiffness of top spring is an important factor affecting the critical buckling load of a stepped column, whereas the effect of shear deformation is usually negligible;and the effective length factors of central segments are usually larger than that of the top or bottom one.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2008年第4期544-548,共5页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
云南省高墩桥梁设计施工运营关键技术研究(TST2003462105A)
关键词
阶形墩
递推公式
临界荷载
计算长度
stepped pier
recursive formula
critical load
effective length
