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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］通過采用HRB500鋼筋和LC50高強(qiáng)輕骨料混凝土的剪跨比為3的不同受拉縱筋率的無腹筋梁試驗(yàn)，研究了試驗(yàn)梁開裂和極限承載力階段的受力特征，并著重研究了低受拉縱筋率對(duì)梁破壞模式的影響規(guī)律。結(jié)合已有的試驗(yàn)研究結(jié)果，對(duì)我國現(xiàn)行《輕骨料混凝土結(jié)構(gòu)規(guī)程》（JGJ 12—2006）中梁的最小受拉縱筋配筋率取值進(jìn)行了檢驗(yàn)。研究結(jié)果表明輕骨料混凝土梁抗剪承載力計(jì)算時(shí)應(yīng)當(dāng)考慮受拉縱筋率的影響。

［關(guān)鍵詞］高強(qiáng)輕骨料混凝土； 高強(qiáng)鋼筋； 最小配筋率； 破壞模式

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)10-0064-06

Experiments on behavior of high-strength lightweight concrete beams without web reinforcement with low longitudinal reinforcement ratio

Tan Haoyue1, 2,  Zhang Chuan1, 2, Zhu Aiping3, Ji Ke1, 2, Wang Xinlei1, 2

(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:Experiments on light weight concrete beams without web reinforcement with different longitudinal reinforcement ratios were carried out, using HRB500 steel bar and high-strength lightweight concrete LC50. The shear span ratio of these beams is 3. Characteristics of cracking and ultimate strength were investigated. In particular, the influence of low longitudinal reinforcement ratio on failure mode of beams was studied in depth. Based on the obtained experimental results, the codified value of minimum longitudinal reinforcement ratio of lightweight concrete beams in Technical specification for lightweight aggregate concrete structures (JGJ 12—2006) was examined. The findings  show that the effect of longitudinal reinforcement ratio on shear capacity should be considered in shear design equations for lightweight concrete beams.

Keywords:high-strength lightweight concrete; high-strength reinforcement; minimum longitudinal reinforcement ratio; failure mode

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