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（哈爾濱工業(yè)大學(xué)建筑設(shè)計(jì)研究院， 哈爾濱 150090）

［摘要］近年來(lái)施工過(guò)程中火災(zāi)頻發(fā)，與已有建筑火災(zāi)相比，施工現(xiàn)場(chǎng)火災(zāi)具有不同的特點(diǎn)，即火災(zāi)時(shí)混凝土多處于較早齡期。針對(duì)建筑物施工期間高溫火災(zāi)致?lián)p后的混凝土結(jié)構(gòu)，考慮混凝土較早齡期和不同冷卻方式等因素的影響，分析了火災(zāi)高溫對(duì)混凝土和鋼材力學(xué)性能的損傷情況，并結(jié)合具體的工程案例，對(duì)施工過(guò)程中建筑火災(zāi)災(zāi)后鑒定評(píng)估的關(guān)鍵問(wèn)題進(jìn)行了討論和分析。研究表明，早齡期混凝土火災(zāi)后的抗壓強(qiáng)度有一定的恢復(fù)發(fā)展；受火構(gòu)件的混凝土真實(shí)殘余抗壓強(qiáng)度，宜采用齡期28d后混凝土，并通過(guò)鉆芯法確定；高溫火災(zāi)致?lián)p后的混凝土結(jié)構(gòu)加固處理，宜保證處理后的結(jié)構(gòu)性能等同于新建建筑。研究結(jié)果可為早齡期混凝土結(jié)構(gòu)火災(zāi)后的災(zāi)害評(píng)估和鑒定修復(fù)提供一些參考。

［關(guān)鍵詞］施工過(guò)程； 火災(zāi)； 力學(xué)性能； 損傷； 早齡期； 鑒定

中圖分類號(hào)：TU312+.3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)12-0018-06

Structural assessment and treatment of post-fire building under construction

Xu Shuquan, Wang Hongguo, Zeng Qinglong, Liu Jingyun， Qu Hao

(The Architectural Design and Research Institute of HIT, Harbin 150090, China)

Abstract:In recent years, fires have occurred frequently during construction. Compared with existing building fires, fires on construction sites have different characteristics, that is the concrete is mostly in the early age when it is on fire. In view of the concrete structure after high-temperature fire damage during the construction of the building, considering the influence of factors such as early age of concrete and different cooling methods, the damage of mechanical properties of concrete and steel at high temperature was analyzed. Combined with specific engineering cases, the key issues of post-fire identification assessment of construction fires were  analyzed. The results show that the compressive strength of early-aged concrete fires has a certain degree of recovery and development. The actual residual compressive strength of concrete subjected to fires should be determined using drill core method after 28 days of age. The reinforcement of concrete structures after high-temperature fire damage should ensure that the structural performance after treatment is equivalent to that of new buildings. The research results can provide some references for disaster assessment and identification of post-fire structure with early-stage concrete structure.

Keywords:construction process; fire disaster; mechanical behavior; damage; early age; identification

作者簡(jiǎn)介：徐樹(shù)全，碩士，工程師，Email:gjggch@163.com。