采用膜方法的夹紧式 HFR-LWC 梁的阻力特性

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Concrete Structures and Materials Pub Date : 2024-02-22 DOI:10.1186/s40069-023-00652-x
Wanxiang Chen, Jiawen Cai, Junxuan Huang, Xiaoyu Yang, Jianjun Ma
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引用次数: 0

摘要

承受横向荷载和膜力共同作用的梁状构件对渐进挠度表现出特殊的荷载响应。因此,我们开发了一个理论模型来描述试验中观察到的夹紧钢筋混凝土 (RC) 梁的抗力行为。支撑引起的膜效应由纵向弹簧和旋转弹簧模拟。通过对混合纤维加固轻集料混凝土(HFR-LWC)梁进行一系列四点弯曲试验,验证了所提方法的预测准确性。结果表明,膜效应显著提高了夹紧 HFR-LWC 梁的承载能力。夹紧梁的极限荷载范围为 64.0 至 184.0 kN,与简支梁相比承载能力更大。梁的极限荷载是屈服线值的 1.85 至 5.31 倍,因此使用屈服线方法可能会严重低估夹紧梁的极限阻力。尽管较大的纵向约束刚度不可避免地会导致脆性破坏,但强支撑约束有利于提高夹紧式 HFR-LWC 梁的承载能力。预测荷载与测量值之间的相对误差小于 7.23%,这表明所提出的模型是估算夹紧梁状构件极限荷载的一个很有前途的工具。
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Resistance Behaviours of Clamped HFR-LWC Beam Using Membrane Approach

Beam-like members sustaining the combined action of transverse load and membrane force exhibit a special load response to progressive deflection. A theoretical model is therefore developed to depict the resistance behaviours of clamped reinforced concrete (RC) beams observed in tests. The support-induced membrane effects are simulated by a longitudinal spring and a rotational spring. The load responses to progressive deflection are obtained using the membrane approach, and the prediction accuracies of proposed method are validated by a series of four-point bending tests on hybrid fibre reinforced-lightweight aggregate concrete (HFR-LWC) beam. It is illustrated that the bearing capacities of clamped HFR-LWC beam are significantly enhanced by the membrane effect. Ultimate load of the clamped beam ranges from 64.0 to 184.0 kN, and the larger bearing capacity compared with simply supported beam is obtained. An ultimate load of 1.85 to 5.31 times the yield line value is achieved, and thereby, the ultimate resistance of the clamped beam might be seriously underestimated using yield line approach. A strong support constraint is beneficial for increasing the load-carrying capacity of clamped HFR-LWC beam, although the large longitudinal restraint stiffness would inevitably gives rise to brittle failure. The relative errors between predicted load and measured value are less than 7.23%, indicating that the presented model is a promising tool to estimate the ultimate load of clamped beam-like member.

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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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