Experimental assessment of reinforced concrete squat walls with high-strength lightweight concrete

IF 3.9 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Karla Patiño-Mora, Hernán Santa María, Rosita Jünemann
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Abstract

This study experimentally evaluates the seismic behavior of reinforced concrete squat walls constructed with high-strength lightweight concrete using expanded clay as lightweight aggregate. Four specimens with identical geometry and reinforcement were tested under monotonic and cyclic loading to assess shear capacity, stiffness degradation, and energy dissipation. Results indicate that the lightweight concrete walls tested exhibited comparable shear strength and cyclic performance to normal-weight concrete walls, despite a 40% lower initial stiffness, but also demonstrated superior behavior compared to other lightweight concrete walls documented in literature with similar characteristics. The experimental shear strength exceeded the nominal capacity predicted by the ACI 318 code, suggesting that the code’s lightweight reduction factor may be overly conservative for high-strength lightweight concrete mixtures. Notably, the results demonstrate the influence of aggregate type on concrete mix in shear response. The study contributes to understanding the nonlinear performance of lightweight concrete walls under lateral loads, providing experimental data that could refine design methodologies for such structures in seismic-prone regions.

Abstract Image

Abstract Image

高强轻量化混凝土钢筋混凝土深蹲墙试验评价
本研究试验评估了用膨胀粘土作为轻骨料的高强轻混凝土建造的钢筋混凝土深蹲墙的抗震性能。四个具有相同几何形状和配筋的试件在单调和循环荷载下进行了测试,以评估剪切能力,刚度退化和能量耗散。结果表明,测试的轻质混凝土墙具有与正常重量混凝土墙相当的抗剪强度和循环性能,尽管初始刚度降低了40%,但与文献中记录的具有相似特征的其他轻质混凝土墙相比,也表现出优越的性能。试验抗剪强度超过ACI 318规范所预测的标称承载力,说明该规范的轻量化折减系数对于高强轻量化混凝土混合物可能过于保守。值得注意的是,研究结果显示了骨料类型对混凝土配合比剪切响应的影响。该研究有助于理解轻型混凝土墙在横向荷载作用下的非线性性能,提供实验数据,可以改进地震易发地区此类结构的设计方法。
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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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