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首页> 外文期刊>Bulletin of earthquake engineering >Dowel connections securing roof-diaphragms to perimeter walls in historic masonry buildings and in-field testing for capacity assessment
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Dowel connections securing roof-diaphragms to perimeter walls in historic masonry buildings and in-field testing for capacity assessment

机译：销钉连接将屋顶隔膜固定到历史砌体建筑物的周边墙壁和容量评估的现场测试

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摘要

In the seismic retrofit of existing masonry constructions, global interventions are often needed to inhibit the onset of local mechanisms and to engage the whole building box-like structural behaviour. Such interventions are represented by perimeter ties and roof and floor diaphragms. This paper considers the roof diaphragm strengthening solution and investigates the use of stud connections securing the roof thin-folded shell to the perimeter walls. Stud connections serve the dual purpose of collecting and transferring the out-of-plane inertia forces of the masonry walls to the roof diaphragm, as well as transferring the diaphragm reaction forces to the shear walls. Specific detailing of the stud connection and the adoption of an improved lime-mortar overlay on the top of the masonry walls are proposed to improve the connection strength; without such improvements, the connection capacity would be jeopardised by the reduced shear resistance of the masonry wall due to the absence of significant vertical confining action at the roof level. The intervention entirely changes the behaviour of the connection and significantly reduces shear stresses on the masonry wall. The structural behaviour of the connection is analysed and discussed. Emphasis is made on the conceptual design of laboratory and in-field test procedures and testing frames in order to replicate the boundary conditions in real applications. In-situ tests may help during the design of the roof thin-folded shell system and allow for the efficiency assessment of the connections prior to the final intervention, thereby proving the actual feasibility of the retrofit solution.
机译：在现有砌体结构的地震改造中，通常需要全局干预来抑制局部机制的发作，并与整个建筑物盒状结构行为接触。这种干预率由周边和屋顶和地板膜片表示。本文考虑了屋顶隔膜强化解决方案，并研究了将屋顶薄折叠壳固定到周边墙壁的螺柱连接的使用。螺柱连接有助于收集和将砌体壁的外平惯性力的双重目的用于屋顶隔膜，以及将隔膜反应力转移到剪切壁。螺柱连接的具体细节和采用改进的石膏砂浆覆盖层在砌体壁的顶部上被提出以提高连接强度;在没有这种改进的情况下，由于在屋顶水平处没有显着的垂直限制动作，通过砌体壁的剪切电阻减小，连接容量将被危及。干预完全改变了连接的行为，并显着减少了砌体墙上的剪切应力。分析并讨论了连接的结构行为。重点是实验室和现场测试程序和测试帧的概念设计，以便在真实应用中复制边界条件。原位测试可以帮助在屋顶薄折叠壳系统的设计过程中，并允许在最终干预之前进行连接的效率评估，从而证明了改造溶液的实际可行性。

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