Despite the fact that Iran is an earthquake prone country and most of its historical buildings are made of brick masonry that is weak in tension, a large number of domical buildings have been constructed all over the country since many centuries ago. Most of magnificent domes in Iran have survived severe earthquakes. The discontinuous double-shell dome has been widely used for important buildings such as mosques and churches. This type of dome provides the possibility of constructing high and large spaces in order to show magnificence and also accommodate a large number of people inside. In this paper, the structural performance of Persian brick masonry discontinuous double-shell domes against earthquakes has been studied. Different shapes of upper and lower shells have been studied. The domes have had spans of 12 m, 15 m and 18 m and a decreasing thickness from the base to the apex with an optimum apex to base thickness ratio. Domes have been analysed under earthquake load by the non-linear finite element method. The Willam-Warnke failure criterion has been used for brick masonry materials. In addition to parametric study, two existing discontinuous double-shell domes of the Imam mosque and Bedkhem church, and two existing single-shell domes of the Saint Mary church and Saint Stepanos monastery in Isfahan have been studied. The values of maximum stresses have been obtained for these domes. Obtained results indicate that selected earthquakes do not cause the failure of the studied domes. The induced stresses increase by increasing the span. The performance of domes is dependent on the geometrical shape of the upper and lower shells. The dome with a drop four-centred upper shell and a drop elliptical lower shell has the best structural behaviour.

尽管伊朗是一个容易发生地震的国家，并且它的大多数历史建筑都是用砖石砌成的，而且砖石的张力较弱，但是自数百年来以来，该国各地已经建造了许多国内建筑。伊朗大部分宏伟的穹顶都幸免于难。不连续的双壳圆顶已广泛用于重要建筑物，例如清真寺和教堂。这种圆顶提供了建造高大空间的可能性，以表现出壮丽的色彩并在室内容纳大量人。本文研究了波斯砖砌体不连续双壳拱顶的抗震性能。已经研究了不同形状的上壳和下壳。圆顶的跨度为12 m，15 m和18 m，从底部到顶部的厚度递减，具有最佳的顶部与底部的厚度比。通过非线性有限元方法对拱顶进行了地震荷载作用下的分析。Willam-Warnke破坏准则已用于砖石材料。除了参数研究之外，还对伊玛目清真寺和Bedkhem教堂的两个现有不连续双壳圆顶以及伊斯法罕的Saint Mary教堂和Saint Stepanos修道院的两个现有单壳圆顶进行了研究。已为这些穹顶获得了最大应力值。所得结果表明，选定的地震不会引起研究圆顶的破坏。感应应力通过增加跨度而增加。圆顶的性能取决于上，下壳的几何形状。