高强轻骨料混凝土无腹筋梁抗剪承载力研究

Shear strength of high-strength lightweight concrete beams without web reinforcement

为了进一步评价我国现行的《轻骨料混凝土结构技术规程》(JGJ 12—2006)中无腹筋梁抗剪承载力计算公式对于高强轻骨料混凝土的适用性,收集整理了公开发表的186根无腹筋轻骨料混凝土梁试验结果,着重研究了混凝土强度、剪跨比、纵筋率、混凝土密度等因素对抗剪承载力的影响规律。在此基础上,采用中、美、日规程或规范提供的抗剪承载力公式以及部分建议公式对试验结果进行了预测分析对比,对各计算公式的准确性进行了定量评价,提出了修正的无腹筋轻骨料混凝土梁的抗剪承载力计算公式。结果表明,修正的公式对于轻骨料混凝土无腹筋梁抗剪承载力的预测更加准确。

In order to further evaluate the adaptability of the shear strength equation of lightweight concrete beams without web reinforcement in current Technical specification for lightweight aggregate concrete structures(JGJ 12—2006)to high-strength lightweight concrete,the test results of 186 lightweight concrete beams without web reinforcement were collected and sorted out,and the effect of parameters such as concrete strength,shear span ratio,longitudinal reinforcement ratio and concrete density on shear strength was investigated in detail.Comparison and analysis of test results prediction using the shear strength equations provided by the Chinese,American,Japanese specifications or codes and some proposed equations with the test results was presented.On this basis,accuracy of these equations was evaluated quantitatively,and a modified calculation equation of the shear strength of such beams was proposed.The results show that the modified equation is more accurate in predicting the shear strength of lightweight concrete beams without web reinforcement.