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In-plane Strength Of Unreinforced Masonry Piers

机译：无筋砌体墩的面内强度

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摘要

The definition of adequate simplified models to assess the in-plane load-bearing capacity of masonry piers, in terms of both strength and displacement, plays a fundamental role in the seismic verification of masonry buildings. In this paper, a critical review of the most widespread strength criteria present in the literature and codes to interpret the failure modes of piers (rocking, crushing, bed joint sliding or diagonal cracking) are proposed. Models are usually based on an approximate evaluation of the stress state produced by the external forces in a few points/sections and on its assessment with reference to a limit strength domain. The aim of the review is to assess their reliability by discussing the hypotheses, which they are based on (assumed stress states; choice of reference points/sections on which to assess the pier strength; characteristics of the limit strength domain) and to verify the conditions for their proper use in practice, in terms of both stress fields (depending on the geometry of the pier, boundary conditions and applied loads) and types of masonry (i.e. regular brick masonry vs rubble stone masonry). In order to achieve these objectives, parametric nonlinear finite element analyses are performed and different experimental data available in the literature are analysed and compared.
机译：在强度和位移方面，评估适当的简化模型以评估砌体墩的平面承载能力的定义在砌体建筑物的地震验证中起着基本作用。在本文中，对文献中存在的最广泛的强度标准和解释桥墩的破坏模式（摇摆，压碎，床缝滑动或对角裂缝）的规范进行了严格的审查。模型通常基于外力在几个点/部分中产生的应力状态的近似评估，并基于极限强度域进行评估。审查的目的是通过讨论它们所基于的假设（假设应力状态；选择用于评估墩强度的参考点/截面；极限强度域的特征）来评估其可靠性，并验证其可靠性。在应力场（取决于墩的几何形状，边界条件和施加的载荷）和砌体类型（即普通砖砌体还是碎石砌体）方面，它们在实践中的适当使用条件。为了实现这些目标，进行了参数非线性有限元分析，并对文献中可用的不同实验数据进行了分析和比较。

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