具有设计缺陷的装配式剪力墙结构的抗震性能

IF 0.7 Q4 ENGINEERING, MECHANICAL Journal of Vibroengineering Pub Date : 2023-11-04 DOI:10.21595/jve.2023.23508
Hua Yan, Bo Song, Huanhuan Yin
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引用次数: 0

摘要

套筒灌浆连接是装配式施工中预制剪力墙互连的常用方法。在现场施工领域,如何完全避免套筒注浆缺陷仍然是一个挑战。为了研究存在套筒灌浆缺陷的剪力墙结构的抗震性能和随后的损伤进展,利用ABAQUS软件建立了一个两层剪力墙模型。采用低循环往复加载的数值模拟,研究在三种不同的运行环境下进行:无缺陷、局部缺陷和全面缺陷。结果提供了洞察加剧的混凝土损伤所引发的缺陷存在于剪力墙结构。这些缺陷会导致钢筋过早屈服,从而导致钢筋塑性长度的扩大,从而阻碍钢筋与混凝土的协调变形。在初期加载阶段,“夹紧现象”在完全缺陷结构中尤为明显。随着循环荷载的增加,缺陷和无缺陷结构的滞回曲线趋于收敛。无论是否存在注浆缺陷,结构的骨架曲线在反力达到峰值前均表现出显著的均衡性,而存在缺陷的结构在反力达到峰值前表现出过早的衰减。这反过来又降低了结构变形预警的效果,危及安全。综上分析可知,套筒灌浆缺陷的存在对剪力墙结构的抗震性能和后续损伤轨迹有显著影响。因此,在现场施工中解决和减轻这些缺陷是维护结构综合安全和稳定的必要前提。
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Seismic performance of fabricated shear wall structures with design defects
The sleeve grouting connection stands as a customary method for interlinking precast shear walls within assembly construction. In the realm of on-site construction, achieving complete avoidance of sleeve grouting defects remains a challenge. In an endeavor to scrutinize the seismic performance and the subsequent progression of damage within shear wall structures riddled with sleeve grouting defects, a two-story shear wall model was formulated through the utilization of ABAQUS software. Employing numerical simulation of low cycle reciprocating loading, the study was conducted across three distinct operational contexts: absence of defects, localized defects, and comprehensive defects. The outcomes proffer insight into the exacerbated concrete damage triggered by defects present within shear wall structures. These defects contribute to premature yielding of reinforcement and a consequent amplification in the plastic length of the reinforcement, consequently impeding the harmonized deformation of reinforcement and concrete. The “pinch phenomenon” is particularly conspicuous within fully defective structures during the nascent loading stages. As cyclic loads mount, the hysteretic curves of both defective and defect-free structure tend to converge. While the skeleton curve of structures, whether grouting defects are present or not, demonstrates remarkable parity prior to reaching the pinnacle reaction force, the defective structure displays premature waning in reaction force. This, in turn, curtails the efficacy of early warning concerning structural deformation and jeopardizes safety. In light of the foregoing analysis, it is manifest that the presence of sleeve grouting defects significantly impacts the seismic performance and subsequent damage trajectory of shear wall structures. As a corollary, addressing and mitigating these defects during on-site construction emerge as imperative prerequisites for upholding the comprehensive safety and stability of the structure.
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来源期刊
Journal of Vibroengineering
Journal of Vibroengineering 工程技术-工程:机械
CiteScore
1.70
自引率
0.00%
发文量
97
审稿时长
4.5 months
期刊介绍: Journal of VIBROENGINEERING (JVE) ISSN 1392-8716 is a prestigious peer reviewed International Journal specializing in theoretical and practical aspects of Vibration Engineering. It is indexed in ESCI and other major databases. Published every 1.5 months (8 times yearly), the journal attracts attention from the International Engineering Community.
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