爆炸荷载作用下钢管混凝土柱非线性分析

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发布时间：2021-11-19

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基于统一强度理论，推导了钢管混凝土柱的塑性极限弯矩和均布荷载作用下简支梁的极限位
移。考虑爆炸反应过程中钢管混凝土柱质量和刚度改变产生的非线性影响，采用等效单自由度模
型和逐步积分法，分析了爆炸荷栽作用下钢管混凝土柱的动态响应。将理论计算结果与相关文献
计算结果进行对比，验证了理论计算方法的正确性。研究结果表明：随着套箍系数的增大，塑性极
限弯矩及极限位移增大；随着侧压系数的增大，塑性极限弯矩增大；考虑钢管对受压区混凝土抗压
强度的提高比不考虑时塑性极限弯矩提高了 l2 ～19 ；提出的计算方法满足钢管混凝土柱抗爆
分析的精度要求，可为钢管混凝土柱的抗爆设计和防护提供参考。
关键词：爆炸荷载；钢管混凝土柱；统一强度理论；塑性极限弯矩；等效单自由度模型；逐步积分法
中图分类号：TU398．1 文献标志码：A
Nonlinear Analysis of Concrete—filled Steel Tubular
Colum ns Under Blast Load
CAO Xue—ye，ZHAO Jun—hai，LI Yan
(School of Civil Engineering，Chang’an University，Xi’an 710061，Shaanxi，China)
Abstract： The plastic ultim ate m oment 0f concrete—filled stee1 tubular and the ultimate
displacement of the simply supported beam under uniformly distributed load were derived based
on unified strength theory． Considering nonlinear im pact of mass and stiffness changed in the
process of the reaction，the dynamic responses of concrete—filled steel tubular columns under blast
load were analyzed by the equivalent single degree of freedom model and step by step integration
m ethod．The results of this method were compared with relevant literatures and the accuracy 0f
the method was verified． The study results show that the plastic ultim ate moment and the
ultimate displacement increase along with the increase of hoop coefficient； the plastic ultimate
m oment also increases along with the increase of lateral pressure coefficient；the plastic ultimate
moment considering the improvement of the compressive strength of concrete increases 1 2 一1 9
than that without considering the im provem ent． The proposed method is satisfied for the
requirement of the analytical precision， and can he referred for the research and the safety of
concrete—filled steel tubular columns under blast load．
Kev words：blast 1oad；concrete filled steel tubular colum n；unified strength theory；plastic uhi—
m ate m oment；equivalent single degree of freedom m odel；step by step integration method