爆炸荷载作用下钢筋混凝土梁动力响应的数值分析  

Numerical Analysis on Dynamic Response of Reinforced Concrete Beam under Blasting Load

作　　者：都浩[1,2] 邓芃[1] 杜荣强[1] 

机构地区：[1]山东科技大学土木建筑学院,山东青岛266510 [2]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266510

出　　处：《山东科技大学学报（自然科学版）》2010年第6期50-54,共5页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：山东科技大学科学研究"春蕾计划"项目(2009AZZ118)

摘　　要：由于爆炸荷载具有峰值压强大、作用时间短的特点,钢筋混凝土梁在爆炸荷载作用下的动力响应较为复杂。为了深入研究钢筋混凝土梁的抗爆性能,应用瞬态动力分析软件LS-DYNA建立了钢筋混凝土梁的三维有限元模型。数值模型中钢筋混凝土采用分离式模型,并且考虑了钢筋和混凝土材料的应变率效应。对已有文献中的钢筋混凝土梁承受爆炸荷载的试验进行了数值模拟,并将模拟结果与试验结果进行了对比分析,结果表明所采用的数值模型可以较好地模拟爆炸荷载作用下钢筋混凝土梁的动力响应。在此基础上,研究了钢筋混凝土梁在不同爆炸荷载作用下的破坏模式。分析结果表明,随着峰值压力的增加,钢筋混凝土梁的破坏模式由弯曲破坏转变为剪切破坏。Because blasting load possesses the characteristics of high pressure of peak value and short time of action,the dynamic responses of reinforced concrete（RC） beams under blasting load are rather complicated.In order to deeply study the blasting-resistant behavior of RC beams,3D finite element model of RC beams was established by using transient dynamic software LS-DYNA.In numerical models,separate models were used for steel bar and concrete and the strain rate effects of steel and concrete materials were considered.The experiments of RC beam subjected to blasting load in existing references were simulated.The results of simulation and experiment were compared.The results showed that the numerical model used in the paper could better simulate the dynamic responses of RC beams under blasting load.And the failure modes of RC beams were studied under different blasting loads.It can be concluded that with the increase of peak pressure,the failure mode of RC beams turns to shear failure from flexural failure.

关 键 词：爆炸荷载 钢筋混凝土梁 动力性能 数值分析 破坏模式 

分 类 号：TU352.1[建筑科学—结构工程]