钢板剪力墙钢筋混凝土框架边界元极限剪切承载力和抗弯承载力设计方法的理论模型

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL
Yonghui An, Shentong Lin, Jinping Ou
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引用次数: 0

摘要

钢板剪力墙(SPSWs)已被证明是钢筋混凝土框架(RCFs)中有效的抗侧力结构。尽管钢板剪力墙技术不断进步,但使用当前的简化模型准确预测钢板剪力墙 RCF 的极限抗剪能力仍具有挑战性。此外,在以往的研究中,RCF-SPSW 边界元素(梁和柱)的抗弯承载力设计程序涉及复杂的迭代程序,阻碍了其广泛实施。为了解决这两个问题,本文采用理论和数值方法研究了 RCF-SPSW 系统的推移响应和板框相互作用 (PFI)。本文有三个主要贡献。首先,本文提出了 RCF-SPSW 的极限剪力承载力理论模型,该模型也可用于预测 RCF-SPSW 中边界框架的剪力贡献。与传统模型相比,RCF-SPSW 的极限抗剪承载力和边界框架的剪力贡献计算误差分别仅为 3.7% 和 6.7%,大幅降低。针对 RCF-SPSW 的全局倒塌机制(塑性铰链在结构内部的均匀分布)绘制了简化示意图,以方便计算内功和反作用力。其次,提出了避免跨内塑性铰的边界元素抗弯承载力设计方法。所提出的方法能够直接估算可能引发整体坍塌机制的挠曲需求,而无需复杂的迭代程序。讨论了当前 RCF-SPSW 系统中钢边界框架设计假设的适用性,并提出了工程建议,以确保设计更安全、更经济。对比结果证实了所提设计方法的适用性,可用于实现 RCF-SPSW 系统的全局坍塌机制。第三,阐明了屈服面板作用对 RCF-SPSW 边界元素抗弯能力的影响。比较结果表明,在 RCF 中添加 SPSW 会改变边界元素上的轴向力,并对抗弯能力产生显著影响。设计建议强调了避免边界元件平衡破坏的重要性。所提出的理论模型可用于在地震荷载下精确预测 RCF-SPSWs 系统中边界构件的剪力贡献,从而节约边界构件的截面;所提出的抗弯承载力设计方法可实现全局倒塌机制,从而提高结构安全性和耗能能力;此外,由于避免了复杂的迭代程序,还提高了建筑设计效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Theoretical model of ultimate shear capacity and flexural capacity design method of boundary elements for reinforced concrete frames with steel plate shear walls

The steel plate shear walls (SPSWs) have been proven effective in reinforced concrete frames (RCFs) as a lateral force-resistant structure. Despite of advancements, accurately predicting the ultimate shear capacity of RCFs with SPSWs remains challenging using current simplified models. Additionally, the flexural capacity design procedure for the boundary elements (beams and columns) in previous studies of RCF-SPSWs involved intricate iterative procedures, hindering its widespread implementation. To address the two issues, this paper investigates the pushover responses and the plate-frame interaction (PFI) of an RCF-SPSWs system using theoretical and numerical methods. There are three main contributions. First, a theoretical model of ultimate shear capacity for RCF-SPSWs is proposed, which can also be used to predict shear contributions of boundary frames in RCF-SPSWs. Calculation errors for ultimate shear capacity of RCF-SPSWs and shear contribution from the boundary frame are only 3.7% and 6.7% respectively, which are reduced dramatically compared with the traditional model. A simplified schematic diagram for the global collapse mechanism (uniform distribution of plastic hinges within a structure) of RCF-SPSWs is developed to facilitate the calculation of internal work and reaction forces. Secondly, a flexural capacity design method for the boundary elements to avoid in-span plastic hinges is proposed. The proposed method enables the achievement of direct estimation of the flexural demands that could trigger a global collapse mechanism, all without intricate iterative procedures. The applicability of current assumptions for the design of steel boundary frame in RCF-SPSWs system is discussed, and engineering suggestions are provided to ensure safer and more economic designs. Comparison results confirmed the applicability of the proposed design method, which can be adopted to achieve the global collapse mechanism for RCF-SPSW system. Thirdly, impacts of yielding panel actions on the flexural capacity of boundary elements of RCF-SPSWs are clarified. Comparison results demonstrated that adding SPSWs to an RCF alters the axial force on boundary elements and significantly impacts the flexural capacity. A design suggestion is made to emphasize the importance of avoiding the balanced failure of boundary elements. The proposed theoretical model can be used to economize the cross-section of boundary elements in RCF-SPSWs system under seismic loads due to accurate prediction of their shear contribution; the proposed flexural capacity design method can achieve a global collapse mechanism, and thus the structural safety and energy dissipation capacity are improved; moreover, the building design efficiency is also improved due to avoidance of intricate iterative procedures.

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来源期刊
Earthquake Engineering & Structural Dynamics
Earthquake Engineering & Structural Dynamics 工程技术-工程:地质
CiteScore
7.20
自引率
13.30%
发文量
180
审稿时长
4.8 months
期刊介绍: Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.
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