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Static and seismic design of one-way and two-way jack arch masonry slabs

机译：单向和双向千斤顶砌体楼板的静力和抗震设计

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摘要

Steel I-beam, brick jack arch slabs have long been used to floor and roof industrial and residential buildings in many parts of the world. Collapse of a large number of these non-homogeneous one-way slabs during past earthquakes has highlighted their poor seismic performance. However, due to their easy construction together with low cost, the jack-arch slab is still widely used in many countries. In this article, the weaknesses inherent in the traditional one-way jack-arch slabs are explored. To overcome these shortcomings, a new two-way system is proposed. Results of static and dynamic tests on full scale two-way and one-way jack-arch slabs and finite element numerical analyses, aimed at investigating the effectiveness of the proposed two-way system, are presented with favourable conclusions. Following these investigations the static and seismic design of jack arch slabs are discussed. The proposed, allowable stress design method is based on designing for the steel grid and controlling the stresses in brick arches. Parameters necessary for an equivalent static seismic load calculation are first determined. Finite element numerical analyses are then conducted to investigate the effects of a number of parameters on the design of the slab and the necessary design factors are evaluated. In addition, appropriate tables and figures are presented to facilitate the design of the one-way and two-way jack arch slabs. It is concluded that the jack arch slab system, designed and constructed as presented in this article, provides a viable, low cost alternative to other forms of flooring in seismic zones and elsewhere.
机译：长期以来，钢制工字梁，砖砌拱形楼板一直用于世界许多地区的工业和住宅建筑的地板和屋顶。在过去的地震中，大量的这些非均质单向平板坍塌，突出表明了它们的抗震性能差。然而，由于其易于建造且成本低廉，顶拱板在许多国家仍被广泛使用。本文探讨了传统的单向千斤顶板固有的弱点。为了克服这些缺点，提出了一种新的双向系统。为了研究所提出的双向系统的有效性，提出了在全尺寸双向和单向千斤顶拱板上进行静态和动态测试的结果以及有限元数值分析的结果。经过这些研究，讨论了千斤顶拱板的静力和抗震设计。所提出的允许应力设计方法是基于钢格网的设计并控制砖拱中的应力。首先确定等效静地震荷载计算所需的参数。然后进行有限元数值分析，以研究许多参数对平板设计的影响，并评估必要的设计因素。此外，还提供了适当的表格和图形，以方便单向和双向千斤顶拱板的设计。结论是，按本文所述设计和构造的千斤顶楼板系统可为地震带及其他地区的其他形式的地板提供一种可行的低成本替代方案。

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