基于软化拉-压杆模型的小跨高比钢板-混凝土组合连梁受剪承载力分析

钢板-混凝土组合(PRC)连梁由于内嵌钢板的作用可显著提高连梁的抗剪承载力和延性耗能能力,但目前对其受剪承载力理论分析研究较少。该文应用软化拉-压杆模型方法对小跨高比PRC连梁进行了受力分析,并结合条带模型,建立了小跨高比PRC连梁受剪承载力分析模型和计算方法,进一步提出了小跨高比PRC连梁受剪承载力简化软化-拉压杆模型计算方法,通过国内外37个小跨高比PRC连梁试验结果对模拟计算建议模型的合理性进行了验证,并与国内外相关规程计算结果进行对比。结果表明:软化拉-压杆模型方法计算值与试验值吻合较好,该方法有明确的力学计算模型,能较为合理的反映跨高比不大于2.5的小跨高比PRC连梁的受剪机理。

Shear strength of plate-reinforced composite coupling beams with small span-to-depth ratio using softened strut-and-tie model

Plate-reinforced composite (PRC) coupling beams can significantly improve the shear strength and energy dissipation capacity of beams, due to the role of embedded steel plate, but theoretical analysis of shear strength for PRC coupling beams is deficient. In this research, the shear strength of PRC coupling beams with small span-to-depth ratio is calculated by using softened strut-and-tie model. In addition, a shear mechanical model and calculating method are established in combination with a multi-strip model. Furthermore, a simplified formula for calculating the shear strength of PRC coupling beams with small span-to-depth ratios is proposed. The suggested analytical model is verified using test data from 37 PRC coupling beams with small span-to-depth ratios. The theoretical results are compared with those of the softened strut-and-tie model and those of the code method. Good agreement between test results and prediction results is achieved. This method has a definite mechanical model and can reasonably reflect the failure mechanisms of PRC coupling beams with span-to-depth ratios no greater than 2.5.