ABSTRACT

The majority of the existing historical brick masonry buildings and monuments in Iran were built adopting a structural system made of modularly connected Persian arched walls; two piers connected by an arc-shaped spandrel. Previous earthquakes revealed that these structures are highly vulnerable and seismic rehabilitation of them is of great significance. However, architectural character and cultural value of these monumental structures significantly rely on the appearance of the building and its decorative finishing. Thus, any retrofitting method modifying the appearance of the building is unacceptable. During the last decades, centercore strengthening method has been developed for seismic rehabilitation of these structures. This paper presents an experimental and numerical investigation on the in-plane behavior of Persian arched walls, before and after retrofitting by centercore method. For this purpose, using fired clay bricks and gypsum-clay mortar, three arched walls were built and tested under reversed cyclic in-plane loading. The results showed a significant increase in the ultimate lateral resistance and improvement of seismic performance indices including ductility and energy dissipation. Moreover, a three-dimensional nonlinear finite element model using a combined approach of smeared cracks and discrete elements was adopted to investigate the monotonic in-plane behavior of the retrofitted arched walls.

摘要

伊朗现存的大部分历史砖石建筑和纪念碑都是采用由模块化连接的波斯拱形墙组成的结构体系建造的；两墩以弧形拱肩相连。以往的地震表明，这些结构非常脆弱，对其进行抗震修复具有重要意义。然而，这些纪念性建筑的建筑特征和文化价值在很大程度上取决于建筑物的外观及其装饰。因此，任何改变建筑物外观的改造方法都是不可接受的。在过去的几十年中，为这些结构的抗震修复开发了中心加固方法。本文介绍了波斯拱形墙面内行为的实验和数值研究，centercore 法改造前后。为此，使用烧制粘土砖和石膏粘土砂浆建造了三个拱形墙，并在反向循环面内载荷下进行了测试。结果表明，极限侧向阻力显着增加，抗震性能指标（包括延性和能量耗散）得到改善。此外，采用涂抹裂缝和离散元相结合的三维非线性有限元模型来研究加固拱形墙的单调面内行为。结果表明，极限侧向阻力显着增加，抗震性能指标（包括延性和能量耗散）得到改善。此外，采用涂抹裂缝和离散元相结合的三维非线性有限元模型来研究加固拱形墙的单调面内行为。结果表明，极限侧向阻力显着增加，抗震性能指标（包括延性和能量耗散）得到改善。此外，采用涂抹裂缝和离散元相结合的三维非线性有限元模型来研究加固拱形墙的单调面内行为。