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(1 清華大學(xué)土木工程系，北京 100084； 2 清華大學(xué)結(jié)構(gòu)工程與振動(dòng)教育部重點(diǎn)實(shí)驗(yàn)室，北京 100084)

［摘要］通過(guò)集中荷載作用下的8根高強(qiáng)輕骨料混凝土簡(jiǎn)支梁的抗剪試驗(yàn)研究，分析了高強(qiáng)輕骨料混凝土梁的抗剪破壞形態(tài)和抗剪性能。結(jié)合國(guó)外大量砂輕混凝土簡(jiǎn)支梁抗剪試驗(yàn)結(jié)果的分析，提出了砂輕混凝土無(wú)腹筋梁斜向開裂荷載和抗剪極限荷載的計(jì)算公式，與試驗(yàn)結(jié)果符合較好。在此基礎(chǔ)上，建議了砂輕混凝土無(wú)腹筋梁和有腹筋梁的簡(jiǎn)化抗剪計(jì)算公式。

［關(guān)鍵詞］輕骨料混凝土；高強(qiáng)混凝土；簡(jiǎn)支梁；抗剪承載力

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.