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（1 廣西大學(xué)土木建筑工程學(xué)院， 南寧 530004； 2 廣西大學(xué)工程防災(zāi)與結(jié)構(gòu)安全教育部重點(diǎn)實(shí)驗(yàn)室， 南寧 530004；  3 西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055）

［摘要］為研究?jī)?nèi)配PVC管約束高強(qiáng)混凝土（PVC-RHC）短柱的滯回性能及抗剪承載能力，設(shè)計(jì)了5個(gè)試件進(jìn)行擬靜力試驗(yàn)，其中3個(gè)PVC-RHC 試件，內(nèi)配鋼管約束高強(qiáng)混凝土短柱（CST-RHC）、鋼筋高強(qiáng)混凝土短柱（RHC）對(duì)比試件各1個(gè)。試驗(yàn)結(jié)果表明：所有試件均發(fā)生剪切斜壓破壞；與試件RHC相比，內(nèi)配PVC管和鋼管約束高強(qiáng)混凝土短柱的滯回曲線(xiàn)更為飽滿(mǎn)，耗能能力更強(qiáng)，強(qiáng)度衰減緩慢，極限變形大，延性提高；隨著PVC管徑高比和軸壓比的增加，PVC-RHC試件的耗能能力和變形能力降低。采用《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》（GB 50010—2010）對(duì)構(gòu)件抗剪承載力進(jìn)行計(jì)算發(fā)現(xiàn)，計(jì)算結(jié)果偏小，約有30%的安全富裕。最后根據(jù)試驗(yàn)破壞機(jī)理，建立力學(xué)分析模型，推導(dǎo)出構(gòu)件抗剪承載力計(jì)算公式，計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合較好。

［關(guān)鍵詞］PVC； 高強(qiáng)混凝土； 短柱； 滯回性能； 抗剪承載力

中圖分類(lèi)號(hào)：TU398文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)21-0046-06

Hysteric behavior and  shear bearing capacity calculation of embedded PVC pipe confined reinforced  high-strength concrete short columns

Chen Zongping1,2, Ke Xiaojun1,3, Chen Yuliang1, Xue Jianyang3

(1 College of Civil Engineering and Architecture, Guangxi University， Nanning 530004, China;  2 Key Laboratory of Disaster  Prevention and Structural Safety of China Ministry of Education, Guangxi University, Nanning 530004, China; 3 School of Civil Engineering, Xi′an University of Architecture and Technology， Xi′an 710055, China)

Abstract:To study the hysteretic behavior and shear bearing capacity of embedded PVC pipe confined reinforced high-strength concrete (PVC-RHC) short columns, three PVC-RHC short columns specimens, one embedded steel tube confined reinforced high-strength concrete (CST-RHC) specimen and one reinforced high-strength concrete (RHC) specimen were designed for quasi-static test. Test results indicate that all specimens occur shear diagonal compression failure. Comparing with RHC short column, PVC-RHC and CST-RHC short columns have more plump hysteretic loops and better energy dissipation capacity. The bearing capacity degrades slowly, the limit deformation increases, and the ductility was improved. With the increasing of PVC diameter height ratio and axial compression ratio, the energy dissipation capacity and deformation capacity of PVC-RHC short columns decrease. Comparing with test results of the shear bearing capacity, the calculation results using Code for design of concrete structures(GB 50010—2010) have quite large safe factor (about 30%). Finally, the formulas for calculating the shear bearing capacity are derived according to the failure mechanism. The calculation results are in good agreement with test results.

Keywords:PVC; high-strength concrete; short column; hysteretic behavior; shear bearing capacity

*國(guó)家自然科學(xué)基金項(xiàng)目（51268004，51578163），廣西自然科學(xué)基金重點(diǎn)項(xiàng)目（2016GXNSFDA380032），廣西高等學(xué)校高水平創(chuàng)新團(tuán)隊(duì)及卓越學(xué)者計(jì)劃資助項(xiàng)目（桂教人［2017］38號(hào)）。

作者簡(jiǎn)介：陳宗平，教授，博士生導(dǎo)師，Email: zpchen@gxu.edu.cn。