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首页> 外文期刊>Journal of structural engineering >Stress-Strain Behavior of C-Shaped Confined Concrete Masonry Boundary Elements of Reinforced Masonry Shear Walls
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Stress-Strain Behavior of C-Shaped Confined Concrete Masonry Boundary Elements of Reinforced Masonry Shear Walls

机译：钢筋混凝土剪力墙C形承压混凝土砌块边界元的应力应变行为

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摘要

Reliable material stress-strain relationship is the cornerstone of any analysis process. Unlike reinforced concrete, limited studies focused on the stress-strain behavior of confined reinforced masonry. Reinforced masonry boundary elements (RMBEs) added at the masonry shear wall ends allow placing of at least four longitudinal reinforcement bars restrained by transverse hoops and thus introducing confinement to the wall's most stressed zone. This study presents the observed stress-strain relationship of 30 C-shaped half-scale fully grouted unreinforced and reinforced masonry boundary element specimens tested under concentric compression loading. The effect of changing hoop spacing, longitudinal reinforcement ratio, and the strength of grout on the axial stress-strain behavior of RMBE is investigated. This study quantifies and correlates the effect of these parameters on the RMBE peak stress, strain corresponding to peak, and postpeak behavior. Finally, this study investigates the capability of three existing stress-strain models in predicting the RMBE stress-strain relationship. Enhancement in both peak and postpeak stress-strain behavior were observed by decreasing the hoop spacing, increasing the longitudinal reinforcement ratio, and increasing the grout strength. The studied models overestimated the enhancement in the RMBE strength, significantly overestimated the enhancement in the RMBE strain capacity, and did not capture the postpeak stress drop. This study emphasizes the need for a new stress-strain model that can predict the RMBE response considering various confinement effects.
机译：可靠的材料应力-应变关系是任何分析过程的基石。与钢筋混凝土不同，有限的研究集中在承压钢筋砌体的应力-应变行为上。在砌体剪力墙末端添加的钢筋砌体边界元素（RMBE）允许放置至少四个受横向箍约束的纵向钢筋，从而将约束限制在墙体应力最大的区域。这项研究提出了在同心压缩荷载下测试的30个C形半尺度全灌浆未加固和加固砌体边界单元标本的观察到的应力-应变关系。研究了改变箍距，纵向配筋率和灌浆强度对RMBE轴向应力-应变行为的影响。这项研究量化并关联了这些参数对RMBE峰值应力，与峰值相对应的应变以及峰后行为的影响。最后，本研究调查了三种现有的应力-应变模型预测RMBE应力-应变关系的能力。通过减小环向间距，增加纵向增强比和增加灌浆强度，可以观察到峰值和峰值后应力应变行为的增强。所研究的模型高估了RMBE强度的增强，显着高估了RMBE应变能力的增强，并且没有捕获峰后应力下降。这项研究强调需要一种新的应力应变模型，该模型可以考虑各种约束效应来预测RMBE响应。

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