Behavior of Cantilever Slabs in a Blast Environment

Behavior of structural elements under blast loading is different from that under usual loading conditions that are considered in conventional structural deigns. Cantilever slabs are more vulnerable than most other elements under blast loads because of their shape. Understanding the blast behavior of cantilever slabs is useful in strengthening them against blast loads. In this paper, blast loading design envelopes for cantilever slabs are proposed using which, the blast behavior of conventional cantilever slabs can be identified. The paper describes the theories behind these envelopes and the way they can be applied to improve conventional designs. These envelopes have been prepared using numerical techniques. The theories used are accepted, verified and validated theories. The paper shows the possibility of converting a conventional cantilever slab design into impulsive regime design with minor adjustments to the structural design. It points out the importance of increasing slab thickness and controlling steel/concrete ratio for strengthening conventional cantilever slab designs and the requirement of reinforcement at top and bottom fibers.

钢框架结构中的绑定约束力分析

为探讨钢框架结构中柱子移除后,框架节点对梁的绑定约束力计算方法,分析了英国结构设计规范(BR2000和BSI 2000)中的钢结构抗连续倒塌设计要求及名义值,并对若干H-型柱以及钢管柱节点的计算绑定约束力和实测节点断裂强度以及规范名义值进行对比,计算时考虑梁柱线刚度相互影响,并考虑钢框架结构中柱子移除后梁的悬臂作用,以防止结构的连续倒塌。研究表明,当内柱拆除后新的绑定约束力要求,可能远远高于目前英国结构设计规范BSI2000中的名义值,因此需完善绑定约束力方法中的相关量之间的关系,以使其应用于柱子拆除后的抗连续倒塌设计。