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Evaluation and Counter Measures on Resistant Capability of Important Structures against Impact and Blast Loads

重要结构抗冲击、爆炸荷载能力评价及对策

基本信息

批准号：
16206057
负责人：
NONAKA Taijiro
金额：
$ 30.95万
依托单位：
Chubu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Numerical simulation has been carried out to make clear the collapsing process of twin towers at the New York World Trade Center, which was attacked by jet-liners in the 9.11 event. Overall vibratory response together with local damage development is followed, leading to the clarification of the structurally developed mechanism in the fact that the south tower remained standing still about an hour before complete collapse. A model experiment has been carried out to observe the process of progressive collapse that has led the towers to the final collapse. It has turned out that the tube structure composing of densely arranged columns along the perimeter could sustain gravity loads, at least preventing instantaneous collapse, provided the perimeter columns are supported transversely by the system of flooring and beams strongly enough to meet 2% requirement as specified in Japanese standard. A proposition is made in this connection for designing a building structure which might be subject … More ed to an impact or blast load suffering column failure. Attention is paid to the gravity load supporting system by columns, which are to be categorized into two groups. One group must be strong enough to remain without failure, whereas the other group may undergo partial failure, but still contributing to the redistribution of load bearing system, and to increasing the redundancy of the whole structural system.Simulation has been executed to reveal the response of a typical 20 story reinforced concrete building to the impact of a small airplane in one case and to medium size jet-liner in another. The structural response in the former corresponds to 1/10〜1/30 of the case of a design earthquake; whereas in the later, impact force reaches a maximum in excess of the horizontal load carrying capacity of the impacted story, corresponding to 1/2〜1/4 of the response to a design earthquake. In the latter, however, inter-story collapse does not occur, since the impacting duration is much shorter than the fundamental period of vibration of the building. Less

对9.11事件中遭受喷气式客机撞击的纽约世贸中心双塔的倒塌过程进行了数值模拟。整体振动响应连同局部损伤的发展，导致澄清的结构发展机制，事实上，南塔仍然站在不动约一个小时前完全倒塌。通过模型试验，观察了连续倒塌导致塔楼最终倒塌的过程。结果表明，由沿周边沿着密集排列的柱组成的筒体结构可以承受重力荷载，至少可以防止瞬时倒塌，前提是周边柱由地板和梁系统横向支撑，其强度足以满足日本标准规定的2%的要求。在此基础上，提出了一种建筑结构的设计方案， ...更多信息艾德承受冲击或爆炸载荷，使立柱失效。重点介绍了重力式柱支承体系，并将其分为两类。其中一组结构必须足够坚固以保持不破坏，而另一组结构可能发生局部破坏，但仍有助于承载系统的重新分配，并增加整个结构系统的冗余度。本文对一个典型的20层钢筋混凝土建筑物在一架小型飞机和一架中型喷气式客机的撞击下的响应进行了模拟。前者的结构响应相当于设计地震情况下的1/10 - 1/30;而后者的冲击力达到最大值，超过受冲击层的水平承载能力，相当于设计地震响应的1/2 - 1/4。然而，在后者中，层间倒塌不会发生，因为冲击持续时间比建筑物的基本振动周期短得多。少