采用ECC湿接缝的装配式钢–混组合梁负弯矩区抗弯性能分析

Flexural Performance of Prefabricated Steel-Concrete Composite Beams with ECC Wet Joints in the Negative Moment Region

摘要: 为探究并优化装配式钢–混组合梁负弯矩区的ECC湿接缝构造，开展负弯矩作用下的装配式钢–混组合梁ECC湿接缝抗弯性能分析。建立基于ECC湿接缝的钢–混组合梁有限元模型并验证模型，进而探究了湿接缝宽度、湿接缝截面形式等参数对组合梁抗弯力学性能影响，结果表明：组合梁的各阶段荷载与ECC湿接缝的宽度成正比，且在ECC湿接缝的宽度超过50 mm后增幅提高；相对于T形湿接缝截面形式，采用菱形和燕尾形的湿接缝截面形式可以提高组合梁的开裂荷载和峰值荷载。

Abstract: To investigate and optimize the ECC wet joint configuration in the negative moment region of prefabricated steel-concrete composite beams, a flexural performance analysis was conducted under negative bending. A finite element model of the composite beam incorporating ECC wet joints was established and validated. Based on the validated model, the effects of wet joint width and cross-sectional shape on the flexural behavior of the composite beam were studied. The results indicate that the characteristic loads at various stages are positively correlated with the wet joint width, and the rate of increase becomes more pronounced when the width exceeds 50 mm. Compared with the T-shaped joint, the use of diamond-shaped and dovetail-shaped wet joint sections can significantly enhance both the cracking load and the peak load of the composite beam.