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（1 廣州城建職業(yè)學(xué)院建筑工程學(xué)院， 廣州 510925； 2 烏海職業(yè)技術(shù)學(xué)院建筑工程系， 烏海 016000； 3 華南理工大學(xué)土木與交通學(xué)院， 廣州 510641）

［摘要］模擬火災(zāi)情況下高強(qiáng)混凝土（HSC）經(jīng)過(guò)高溫處理后的力學(xué)性能，有利于分析和改善HSC的使用性能?；诨炷翐p傷理論，建立高溫處理后混凝土動(dòng)態(tài)損傷的計(jì)算公式。對(duì)25個(gè)HSC棱柱體試件進(jìn)行不同高溫加熱處理，并對(duì)高溫處理后的試件，利用電液伺服壓力試驗(yàn)機(jī)進(jìn)行不同應(yīng)變率下的軸向動(dòng)態(tài)受壓試驗(yàn)。試驗(yàn)結(jié)果表明，200℃以下的HSC棱柱體外觀正常，400～800℃之間的HSC棱柱體開(kāi)始出現(xiàn)裂縫，并隨溫度的升高裂縫不斷增多，溫度越高，裂縫的寬度越大，20℃時(shí)HSC棱柱體的損傷平均值為0-287，溫度越高，損傷平均值越小，800℃的HSC棱柱體的損傷平均值相比20℃的減小47-4%，溫度對(duì)HSC的損傷影響較大，溫度越高，HSC的損傷越大。

［關(guān)鍵詞］高強(qiáng)混凝土； 動(dòng)態(tài)受壓試驗(yàn)； 應(yīng)變率； 損傷

中圖分類(lèi)號(hào)：TU528， TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)09-0055-04

Study on mechanical properties of high-strength concrete subjected to high temperature treatment

Zhou Hui1， Li Jing2， Shi Zenglu2， Gu Renguo3

（1 School of Civil Engineering and Architecture, Guangzhou City Construction College, Guangzhou 510925, China; 2 Department of Architectural Engineering, Wuhai Vocational & Technical College, Wuhai 016000, China； 3 College of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China）

Abstract:It is beneficial to analyze and improve the service performance of high-strength concrete (HSC) to study the mechanical properties of HSC subjected to high temperature treatment under simulated fire. Based on damage theory of concrete, calculation formula of dynamic damage of concrete after high temperature was proposed. Heating treatments on 25 HSC prism specimens were conducted under different high temperatures, and axial dynamic compression tests were conducted on high temperature treated specimens with the use of electro-hydraulic servo pressure testing machine under different strain rates. The test results show that the appearance of HSC prism below 200℃ is normal, and the cracks on HSC prism begin to appear and increase at temperature between 400℃ and 800℃ with increasing temperature. The higher the temperature is, the larger the width of the crack is. The average damage value of HSC at 20℃ is 0-287. The higher the temperature is, the smaller the average damage is. The average damage value of HSC at 800℃ is 47.4% smaller than that at 20℃. The temperature has a great influence on the damage of HSC, and the higher the damage is, the greater the damage of HSC is.

Keywords:high-strength concrete (HSC); dynamic compression test; strain rate; damage

*廣東省高等學(xué)校優(yōu)秀青年教師培養(yǎng)計(jì)劃項(xiàng)目（Yq201462），廣東省品牌專(zhuān)業(yè)建設(shè)項(xiàng)目（2016gzpp016），亞熱帶建筑科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室自主研究課題（2017KB16）。

作者簡(jiǎn)介：周暉，博士，副教授，Email:acl433@163.com。