Seismic performance of RC frames with masonry infills retrofitted by precast ultra-lightweight insulated cementitious composites plates

IF 3.4 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Ning Ning, Zhongguo John Ma, Jigang Zhang, Yue Ding
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Abstract

This paper presents an investigation on the seismic behavior of RC frames with masonry infills retrofitted by precast Ultra-Lightweight Insulated Cementitious Composites plates under cyclic loading. The objective was to provide an easy retrofit approach for concurrent seismic behavior and energy efficiency upgrading of existing RC frames. Three scaled RC frames were built including a control frame and two frames with different retrofit schemes. The experiments were conducted to investigate the effect of different retrofit schemes over the failure patterns, hysteretic curves, energy dissipation abilities, skeleton curves, and characteristic loads and displacements. The retrofitted RC frames provided higher carrying capacities, energy dissipation abilities, and displacement ductility. Retrofit schemes proposed can prevent severe damage of masonry infills, and alleviate shear failure of columns significantly. Based on the test results, ULICC plates influenced on the flexural moments of columns and beams, and base shear distribution were analyzed. Interactions between retrofitted infills and surrounding frames were discussed. A theoretical model based on equivalent strut was proposed to obtain initial lateral stiffness and carrying capacity of retrofitted RC frames. The experiments have demonstrated that precast ULICC plates retrofit strategy can enhance the seismic performances under low-frequency cyclic loading.

Abstract Image

采用预制超轻保温水泥基复合板加装砌体填充物的 RC 框架的抗震性能
本文研究了在循环荷载作用下,使用预制超轻保温水泥基复合材料板对带有砌体填充物的 RC 框架进行改造的抗震行为。目的是为现有 RC 框架的抗震性能和能效升级提供一种简便的改造方法。研究人员建造了三个不同比例的 RC 框架,包括一个对照框架和两个采用不同改造方案的框架。实验研究了不同改造方案对破坏模式、滞回曲线、耗能能力、骨架曲线以及特征荷载和位移的影响。改造后的 RC 框架具有更高的承载能力、耗能能力和位移延展性。所提出的改造方案可防止砌体填充物的严重破坏,并显著减轻柱子的剪切破坏。根据试验结果,分析了 ULICC 板对柱和梁的弯矩以及基底剪力分布的影响。讨论了加固填充物与周围框架之间的相互作用。提出了一个基于等效支撑的理论模型,以获得加固后 RC 框架的初始侧向刚度和承载能力。实验结果表明,预制超临界承重板的加固策略可以提高低频周期荷载下的抗震性能。
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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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