884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

(1 湖南大學(xué)， 長沙 410000； 2 中南建筑設(shè)計(jì)院股份有限公司， 武漢 430071)

［摘要］完成了9個(gè)沖跨比為7的鋼筋混凝土板柱節(jié)點(diǎn)受沖切破壞試驗(yàn),得到了荷載-撓度曲線、應(yīng)變及破壞形態(tài)等信息。根據(jù)本試驗(yàn)結(jié)果和歷史試驗(yàn)數(shù)據(jù),分析了混凝土強(qiáng)度、縱向配筋率、縱筋屈服強(qiáng)度等因素對(duì)試驗(yàn)板破壞形態(tài)及受沖切承載力的影響,并將受沖切承載力試驗(yàn)值與我國混凝土規(guī)范GB 50010—2010、美國規(guī)范ACI 318-08、歐洲規(guī)范EN 1992-1-1∶2004和CEB-FIP Model Code 2010規(guī)范的計(jì)算值進(jìn)行了對(duì)比。結(jié)果表明: 相對(duì)于普通強(qiáng)度混凝土板柱節(jié)點(diǎn)，高強(qiáng)混凝土板柱節(jié)點(diǎn)的破壞特征對(duì)配筋情況并不敏感；混凝土強(qiáng)度和配筋率的變化將影響構(gòu)件的破壞模式；我國混凝土規(guī)范計(jì)算得到的高強(qiáng)混凝土板柱節(jié)點(diǎn)受沖切承載力比普通強(qiáng)度混凝土板柱節(jié)點(diǎn)的計(jì)算結(jié)果保守；我國混凝土規(guī)范中的混凝土抗拉強(qiáng)度不能很好地反映混凝土強(qiáng)度對(duì)受沖切承載力的影響；縱筋配筋率對(duì)受沖切承載力有較大影響。

［關(guān)鍵詞］高強(qiáng)混凝土； 混凝土板； 抗沖切承載力

中圖分類號(hào)：TU375-2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2016)15-0011-08

Experimental investigation of punching shear failure of reinforced concrete slab-column connections

Yi Weijian1, Hong Feng1, Peng Jian2

(1 Hunan University, Changsha 410000, China；2 Central-South Architectural Design Institute Co., Ltd., Wuhan 430071, China)

Abstract:A total of 9 reinforced concrete slab-column connections with punching-span ratio equal to 7 were tested, key information such as the load-deflection curves, strains and failure modes were obtained. Based on the test results and previous data, the effects of concrete strength, ratio and yield strength of longitudinal reinforcement on the failure modes and punching shear capacity were analyzed. Then, the experimental punching shear capacity of all slabs were compared with the calculating values of Chinese concrete code GB 50010—2010, American code ACI 318-08, Euro code EN 1992-1-1∶2004 and CEB-FIP Model Code 2010. The results indicate that failure characteristics of high strength concrete slab-column connections are not sensitive to the reinforcement ratio, when compared to specimens with normal strength concrete. The failure modes are affected by concrete strength and reinforcement ratio. The calculated punching shear capacity of high strength concrete slab-column connections based on the Chinese concrete code are more conservative than that of  specimens with normal strength concrete. The tensile strength of concrete in Chinese concrete code can’t abundantly reflect the effect of concrete strength on punching shear capacity and the longitudinal reinforcement ratio shows great influence on the punching shear capacity.

Keywords:high-strength concrete； concrete slab； punching shear capacity

*國家自然科學(xué)基金項(xiàng)目資助（51338004，51178175）。

作者簡介：易偉建，博士，教授，博士生導(dǎo)師，Email：wjyi@hnu.edu.cn。