Protection of Historical Constructions - Proceedings of PROHITECH 2021
Protection of Historical Constructions - Proceedings of PROHITECH 2021
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历史建筑保护 - PROHITECH 2021 论文集
DOI：
10.1007/978-3-030-90788-4_16
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Elghazouli A
中科院分区：
文献类型：
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作者：
Elghazouli A
本文研究了粘土砖石灰砂浆砌体墙在潮湿和环境干燥条件下的实验结构响应。烧制粘土砖和液压石灰砂浆材料的性能被选择为类似于历史开罗现有的遗产砌体结构。研究内容包括对角受压方板试验、重力荷载作用下的大型墙体试验和面内横向循环位移试验。除了调节类型，还研究了水平床缝中螺旋钢筋加固的有效性。在石灰砂浆中嵌入螺旋钢筋以及提供端部锚固的影响进行了评估。对大尺度构件的荷载-变形全过程响应进行了分析，包括主要性能特征和破坏模式。结果表明，湿度对砌体构件的主要力学性能和整体结构响应有显著影响。对于面板进行对角压缩，在潮湿条件下的强度降低被证明是超过40%相比，干燥的同行。对于承受侧向荷载和预压缩的大型墙体，这种减少明显较低，但可以超过10%。它还表明，提供螺旋钢筋，根据其端部锚固和安排，砌体的对角拉伸强度增加一倍，并抵消由于水分发生的不利影响。
This paper examines the experimental structural response of clay brick lime mortar masonry walls in wet and ambient-dry conditions. The properties of fired-clay bricks and hydraulic lime-mortar materials are selected to resemble those of existing heritage masonry structures in Historic Cairo. The investigation includes tests on square panels under diagonal compression, and large-scale walls subjected to gravity loading and in-plane lateral cyclic displacements. In addition to the conditioning type, the effectiveness of strengthening with helical bars in horizontal bed joints is also investigated. Implications of embedding helical bars in lime mortar as well as the provision of end anchorages are assessed. The complete load-deformation response of the large-scale members is also evaluated, including the main behavioural characteristics and failure modes. The results show that moisture has a notable effect on the main mechanical properties and overall structural response of such masonry components. For the panels subjected to diagonal compression, the strength reduction under wet conditions is shown to be more than 40% compared to the dry counterparts. For the large-scale walls, subjected to combined lateral loading and precompression, this reduction is significantly lower but can exceed 10%. It is also shown that the provision of helical bars can, depending on their end anchorage and arrangement, double the diagonal tension strength of masonry and offset the adverse effects occurring due to moisture.