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首页> 外文会议>EUR 21431; Final Conference of Cost Action C12; 20050120-22; Innsbruck(AT) >The collapse of WTC twin towers: general aspects and considerations on the stability under exceptional loading of columns with partial-strength connections
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The collapse of WTC twin towers: general aspects and considerations on the stability under exceptional loading of columns with partial-strength connections

机译：WTC双塔的倒塌：具有部分强度连接的圆柱在异常载荷下的一般情况和稳定性的考虑

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摘要

The collapse of WTC started a wide scientific debate in the engineering community about tall buildings' design and safety measurements. It has been proven that a main role on the sudden failure of the twin towers has been played by connections. The structural system featured partial strength continuity connections at columns distributed along the height and width of the building with different configurations, in so-called staggered patterns. This was mainly due to economical reasons, since small bending moment values in such zones do not always require full resistance, and to space considerations regarding the overall dimensions of the joints. As a result, vertical members were designed mainly against vertical loads, while under exceptional loadings they may possibly undergo lateral deflection, as dramatically occurred on the September 11th. In this paper, a brief description of the partial strength connections of WTC perimeter columns is presented. Then, the effect of partial strength column splices and of their positioning along the height of the column on the ultimate behaviour of the member is evaluated through parametric nonlinear analyses. The column is represented by two elastic elements connected by a rigid-plastic spring. P-δ effects are taken into account, while residual stress and out of camber are implemented using the concept of equivalent geometrical imperfection.
机译：WTC的倒闭引发了工程界关于高层建筑的设计和安全测量的广泛科学辩论。已经证明，双子塔突然失效的主要作用是通过连接。该结构系统的特征是在沿建筑物高度和宽度分布的圆柱上具有不同强度的部分强度连续性连接，即所谓的交错模式。这主要是由于经济原因，因为在这样的区域中较小的弯矩值并不总是需要完全抵抗，而且还考虑了关于接头整体尺寸的空间考虑。结果，垂直构件的设计主要是承受垂直载荷，而在特殊载荷下，它们可能会发生横向变形，如9月11日发生的那样。在本文中，简要介绍了WTC周边柱的部分强度连接。然后，通过参数非线性分析评估了部分强度柱接头及其沿柱高的位置对构件最终性能的影响。该柱由两个通过刚性塑料弹簧连接的弹性元件表示。考虑了P-δ效应，同时使用等效几何缺陷的概念实现了残余应力和外倾角。

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