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Bearing capacity of embedded channel-shaped steel connections at precast concrete beam end

机译：预制混凝土梁端部嵌入式槽形钢连接的承载力

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摘要

Embedded channel-shaped steel (ECS) connection at precast concrete beam-end proposed in this paper is a kind of novel connection. To study the performance of ECS connection, experiments on 12 specimens were carried out. The embedded length of the ECS, the stirrup spacing, the cavity in the mid-span of the beam and the eccentricity of the ECS were taken into account. Two kinds of failure modes were observed: lever-out of ECS and crushing of the beam-end concrete. The experimental results indicate the following: (1) as the length of ECS increases, the bearing capacity of the ECS connection increases; (2) the stirrup densification could significantly improve the bearing and deformation capacity; (3) the mid-span cavity of the beam has limited influence on the bearing and deformation capacity of the connection; (4) the eccentricity of ECS could slightly reduce the bearing capacity owing to the additional torsion. Subsequently, finite element (FE) models were developed using ABAQUS and validated by the test results. The FE simulations show good agreement with the test results. Based on the verified FE models, a parametric study was conducted, considering different ECS properties including embedded length, section and eccentricity, various stirrup spacing at the beam-end, concrete grade and the distance between cavity and ECS. Finally, to prevent the lever-out of ECS, the optimum design of the ECS connection was proposed according to previous discussion.
机译：本文提出的在预制混凝土梁端的嵌入式槽形钢（ECS）连接是一种新颖的连接。为了研究ECS连接的性能，对12个样本进行了实验。考虑了ECS的嵌入长度，箍筋间距，梁中跨中的空腔以及ECS的偏心距。观察到两种破坏模式：ECS破坏和梁端混凝土的破碎。实验结果表明：（1）随着ECS长度的增加，ECS连接的承载力增加； （2）箍筋的致密化可以显着提高承载力和变形能力； （3）梁的中跨腔对连接的承载和变形能力的影响有限； （4）由于额外的扭转，ECS的偏心可能会略微降低承载能力。随后，使用ABAQUS开发了有限元（FE）模型，并通过测试结果进行了验证。有限元仿真结果与测试结果吻合良好。基于已验证的有限元模型，进行了参数研究，考虑了不同的ECS特性，包括埋入长度，截面和偏心率，梁端的各种箍筋间距，混凝土坡度以及型腔与ECS之间的距离。最后，为防止ECS失效，根据先前的讨论提出了ECS连接的最佳设计。

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