无腹筋轻骨料混凝土梁抗剪承载力的计算  

Evaluation of shear strength of lightweight aggregate concrete without shear reinforcement

作　　者：丁雅博 易伟建[1] 陈晖[1] 

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《中国科技论文》2016年第13期1465-1469,共5页China Sciencepaper

基　　金：国家自然科学基金资助项目(51338004)

摘　　要：为研究无腹筋轻骨料混凝土梁的抗剪承载力,完成了集中荷载下的16根无腹筋混凝土简支梁的受剪承载力试验,得到无腹筋轻骨料混凝土梁抗剪破坏形态和抗剪承载力。根据试验结果与收集的试验数据,对多个抗剪计算模型进行模型误差分析。结果表明:Zararis的预测结果最差,美国规范ACI 318-11和加拿大规范CSA A23.3-04偏于保守,Muttoni和我国轻骨料规范的预测值偏于不安全,Zsutty拟合度最高,但预测值过于不安全。为提高轻骨料混凝土无腹筋梁抗剪计算的准确性和安全性,对试验数据进行非线性拟合,得到无腹筋轻骨料建议计算公式,该公式的计算结果与试验结果吻合较好。In order to investigate the shear strength of lightweight aggregate concrete beams, 16 simply supported beams were tested to shear failure under point load. From the test, the shear failure patterns and the ultimate shear strength of the specimens were obtained. Based on the test data in this study and those collected from other published papers, several shear strength models were analyzed. The results showed that the model by Zararis had the poorest performance. The models by ACI 318-11 and CSA A23. 3-04 underestimated the test shear strength while the predictions of the models by Muttoni and Chinese Specification for Design of Lightweight Aggregate Concrete Structures might be unsafe. The equation proposed by Zsutty most accurately predicted the test shear strength but not conservative enough. To improve the accuracy and safety for predicting of the shear strength of lightweight aggregate concrete beams , a new equation was proposed by using nonlinear regression based on the test data.

关 键 词：无腹筋梁 轻骨料混凝土 抗剪承载力 模型误差分析 

分 类 号：TU37[建筑科学—结构工程]