地下框架结构遭内爆炸冲击下的抗连续倒塌研究

发布时间：2018-01-20 16:14

本文关键词： 爆炸荷载连续倒塌地下钢筋混凝土结构分离式模型土与结构的相互作用防护措施 LS-DYNA软件数值模拟分析　出处：《建筑科学》2015年01期 　论文类型：期刊论文

【摘要】：在爆炸冲击荷载下,地下框架结构的动态响应是一个复杂的非线性过程。本文首先介绍了模拟连续倒塌的3种方法(即替代传力路径法、直接模拟法和三阶段模拟法)和本文所采用的数值模型;其次,本文运用LS-DYNA显式动力分析软件相关功能,建立钢筋混凝土的三维分离式模型(钢筋和混凝土的连接采用共节点方式),将本文采用的三阶段模拟法与直接模拟法、替代传力路径法对比分析,验证了本文方法的合理性及有效性;再次,具体阐述未做防护的地下结构在爆炸荷载作用下的倒塌机理,并为防护提供一定的理论指导;最后提出了两种防护措施(改变梁的箍筋间距),并对比两种防护措施的防护效果,通过对比可以为抗爆设计提供一定的设计依据。计算结果表明:在爆炸荷载下,未做防护的结构破坏十分严重,并最终连续倒塌,做防护的结构整体性完好,没有发生连续倒塌。
[Abstract]:The dynamic response of underground frame structure is a complicated nonlinear process under explosive shock load. In this paper, three methods to simulate continuous collapse are introduced in this paper, that is, alternative force transfer path method. Direct simulation method and three-stage simulation method) and the numerical model used in this paper; Secondly, this paper uses the LS-DYNA explicit dynamic analysis software related function, establishes the reinforced concrete three-dimensional separation model (the steel bar and the concrete connection uses the common node way). Comparing the three-stage simulation method with the direct simulation method and the alternative force path method, the rationality and effectiveness of this method are verified. Thirdly, the collapse mechanism of the unprotected underground structure under the action of explosion load is expounded in detail, and it provides some theoretical guidance for the protection. Finally, two kinds of protective measures (changing the stirrups spacing of beams) are put forward, and the protective effects of the two kinds of protective measures are compared. The calculation results show that the unprotected structures are destroyed very seriously under the explosion load, and finally collapse continuously, and the whole structure of the protective structure is intact. There was no successive collapse.
【作者单位】：天津大学建筑工程学院;曼彻斯特大学机械、航空航天及土木工程学院;天津大学滨海土木工程结构与安全教育部重点实验室;
【基金】：国家自然科学基金项目(50678116,51178310) 2013年国家公派高级研究学者及访问学者(含博士后)项目(学号:201308120137)
【分类号】：TU93;TU312.3
【正文快照】： 斯特M13 9PL,英国;3.天津大学滨海土木工程结构与安全教育部重点实验室,天津300072)进入21世纪,各种各样的恐怖袭击越来越频繁,由于爆炸的破坏力惊人和影响力巨大,建筑工程领域的防爆减灾研究逐渐引起世界各地学者的高度关注。随着地上空间日益狭小及建筑物高度日益增加,地下

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