(1 清华大学土木工程系，北京 100084； 2 清华大学结构工程与振动教育部重点实验室，北京 100084)

［摘要］通过集中荷载作用下的8根高强轻骨料混凝土简支梁的抗剪试验研究，分析了高强轻骨料混凝土梁的抗剪破坏形态和抗剪性能。结合国外大量砂轻混凝土简支梁抗剪试验结果的分析，提出了砂轻混凝土无腹筋梁斜向开裂荷载和抗剪极限荷载的计算公式，与试验结果符合较好。在此基础上，建议了砂轻混凝土无腹筋梁和有腹筋梁的简化抗剪计算公式。

［关键词］轻骨料混凝土；高强混凝土；简支梁；抗剪承载力

Experimental study on shear strength of lightweight high strength concrete beams

Lu Ye^1,2, Ye Lieping^1,2, Sun Hailin^1,2, Ding Jiantong¹

(1 Department of Civil Engineering, Tsinghua Univ., Beijing 100084, China;2 Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Tsinghua Univ.，Beijing 100084, China)

Abstract:Eight lightweight high-strength concrete beams were tested to investigate the shear strength and failure patterns. Based on the analysis of the experimental results and on numerous shear test results of sand-lightweight concrete beams in literature, formulas for the diagonal cracking and the ultimate shear strength of sandlightweight concrete beams without stirrups are proposed. The results from the proposed formulas are found in good agreement with the experimental ones. Simplified design formulas for the shear strength of sand-lightweight concrete beams with and without stirrups are also suggested.