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(1 湖北建科國際工程有限公司, 武漢 430070; 2 西悉尼大學(xué)基礎(chǔ)工程中心, Penrith NSW 2751;3 清華大學(xué)土木工程系, 北京 100084; 4 福州大學(xué)土木工程學(xué)院, 福州 350108)
摘要: 型鋼混凝土構(gòu)件的粘結(jié)滑移性能是型鋼與混凝土兩種性質(zhì)完全不同的材料能夠共同受力協(xié)同工作的基礎(chǔ)。 高溫后型鋼混凝土試件粘結(jié)性能的研究比較少。 為了研究火災(zāi)作用后型鋼混凝土的粘結(jié)滑移性能,進(jìn)行了 8個(gè)標(biāo)準(zhǔn)火災(zāi)(ISO ̄834)作用后型鋼混凝土試件及 3 個(gè)常溫對比試件的推出試驗(yàn)。 通過試驗(yàn)考察了混凝土強(qiáng)度等級(jí)、混凝土保護(hù)層厚度、橫向配箍率和受火時(shí)間等因素對粘結(jié)滑移性能的影響。 結(jié)果表明:常溫工況型鋼混凝土的粘結(jié)力中,化學(xué)膠結(jié)力貢獻(xiàn)較大;而受火后型鋼混凝土的粘結(jié)力中,化學(xué)膠結(jié)力貢獻(xiàn)明顯減小。 受火作用后,各試件剛度和極限荷載大幅降低,但是隨著受火時(shí)間的增長,極限荷載反而有所增加。 常溫工況下,混凝土強(qiáng)度等級(jí)、混凝土保護(hù)層厚度、橫向配箍率三個(gè)因素與粘結(jié)強(qiáng)度呈正比例關(guān)系。 受火作用后,橫向配箍率對極限粘結(jié)強(qiáng)度的影響顯著,而其他各參數(shù)的影響則不明顯。
關(guān)鍵詞: 標(biāo)準(zhǔn)火災(zāi); 型鋼混凝土; 粘結(jié)滑移性能; 推出試驗(yàn); 粘結(jié)強(qiáng)度
中圖分類號(hào):TU398. 7 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002 ̄848X(2022)06 ̄0111 ̄08
DOI:10. 19701 / j.jzjg.20200582
Experimental study on bond ̄slip behavior of steel reinforced concrete members after standard fire
ZHANG Huajun1, TAO Zhong2, HAN Linhai3, WANG Zhibin4
(1 Hubei Jianke International Engineering Co., Ltd., Wuhan 430070, China; 2 Western Sydney University Centrefor Infrastructure Engineering, Penrith NSW 2751, Australia; 3 Department of Civil Engineering, Tsinghua University,Beijing 100084, China; 4 College of Civil Engineering, Fuzhou University, Fuzhou 350108, China)
Abstract: The bond ̄slip behavior of steel reinforced concrete members is fundamental for two materials with completelydifferent properties, steel and concrete, to achieve work together under force. There are few studies on the bond propertiesof steel reinforced concrete specimens after high temperature. In order to study the bond ̄slip properties of steel reinforcedconcrete after fire, the push ̄out tests of 8 standard steel reinforced concrete specimens after fire ( ISO ̄834) and 3 normaltemperature comparison specimens were carried out. The effects of concrete strength grade, concrete protective layerthickness, transverse hoop ratio and fire exposure time on the bond ̄slip properties were investigated through experiments.The results show that the chemical bonding force contributes more to the bonding force of the steel reinforced concrete undernormal temperature conditions, while the chemical bonding force contributes significantly reduced to the bonding force ofthe steel reinforced concrete after fire. After being exposed to fire, the stiffness and ultimate load of each specimendecreased significantly, but with the increase of fire time, the ultimate load actually increased. Under normal temperatureconditions, the three factors of concrete strength grade, concrete protective layer thickness, and transverse hoop ratio areproportional to the bond strength. After being exposed to fire, the transverse hoop ratio has a significant effect on theultimate bond strength, while the effects of other parameters are not obvious.
Keywords:standard fire; steel reinforced concrete; bond ̄slip behavior; push ̄out test; bond strength
第一作者:張華軍,碩士,高級(jí)工程師,注冊土木工程師(巖土),主要從事建筑結(jié)構(gòu)、地下空間、地鐵、基坑、邊坡、隧道、地基處理等方面的研究,Email:56277949@ qq.com。
[引用本文] 張華軍,陶忠,韓林海,等. 標(biāo)準(zhǔn)火災(zāi)作用后型鋼混凝土構(gòu)件的粘結(jié)滑移性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),2022,52(6):111 ̄118,110. ZHANG Huajun,TAO Zhong,HAN Linhai,et al. Experimental study on bond ̄slip behaviorof steel reinforced concrete members after standard fire[J]. Building Structure,2022,52(6):111 ̄118,110.
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