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(1 重慶大學(xué)土木工程學(xué)院, 重慶 400045; 2 重慶大學(xué)山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室， 重慶 400045;  3 中國建筑科學(xué)研究院有限公司， 北京 100013）

［摘要］為了進(jìn)一步評(píng)價(jià)我國現(xiàn)行的《輕骨料混凝土結(jié)構(gòu)技術(shù)規(guī)程》（JGJ 12—2006）中無腹筋梁抗剪承載力計(jì)算公式對(duì)于高強(qiáng)輕骨料混凝土的適用性，收集整理了公開發(fā)表的186根無腹筋輕骨料混凝土梁試驗(yàn)結(jié)果，著重研究了混凝土強(qiáng)度、剪跨比、縱筋率、混凝土密度等因素對(duì)抗剪承載力的影響規(guī)律。在此基礎(chǔ)上，采用中、美、日規(guī)程或規(guī)范提供的抗剪承載力公式以及部分建議公式對(duì)試驗(yàn)結(jié)果進(jìn)行了預(yù)測分析對(duì)比，對(duì)各計(jì)算公式的準(zhǔn)確性進(jìn)行了定量評(píng)價(jià)，提出了修正的無腹筋輕骨料混凝土梁的抗剪承載力計(jì)算公式。結(jié)果表明，修正的公式對(duì)于輕骨料混凝土無腹筋梁抗剪承載力的預(yù)測更加準(zhǔn)確。

［關(guān)鍵詞］高強(qiáng)輕骨料混凝土； 無腹筋梁； 抗剪承載力

中圖分類號(hào)：TU375.1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)10-0070-06

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

Hu Chen1, 2, Zhang Chuan1, 2, Zhu Aiping3

(1 School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2 Key Laboratory of New Technology for Construction of Cities in Mountain Area（Chongqing University）, Ministry of Education, Chongqing 400045, China; 3 China Academy of Building Research, Beijing 100013, China)

Abstract: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.

Keywords:high-strength lightweight concrete; beam without web reinforcement; shear strength

通訊作者：張川，博士，教授，Email: zchuan08@126.com。