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(1 清華大學(xué)土木工程系, 北京 100084; 2 百安力鋼結(jié)構(gòu)應(yīng)用科技有限公司, 珠海 519040)
摘要: 目前鋼-混凝土組合梁的壓型鋼板常作為模板使用,并非受力構(gòu)件. 為達(dá)到防火和受力安全性需求,組合梁須涂裝較厚防火層保護(hù),這使得后期維護(hù)更新存在困難. 高性能耐火鋼的應(yīng)用為組合梁抗火提供了新思路. 對2 個(gè)不同荷載比的無涂裝耐火鋼組合梁主梁試件(壓型鋼板肋平行于鋼梁)和 1 個(gè)次梁試件(壓型鋼板肋垂直于鋼梁)進(jìn)行抗火試驗(yàn). 試驗(yàn)中對爐溫、試件溫度、撓度與應(yīng)變進(jìn)行監(jiān)測. 結(jié)果表明:相同負(fù)載下,主梁試件的抗火性能顯著優(yōu)于次梁試件;試驗(yàn)終止時(shí),組合梁變形未發(fā)生快速變化;相同條件下,組合梁的受力性能和耐火極限與鋼梁、栓釘以及混凝土樓板的溫度發(fā)展密切相關(guān);所有組合梁均發(fā)生整體彎曲變形,且變形速率與豎向荷載大小以及溫度場有關(guān).
關(guān)鍵詞: 耐火耐候鋼; 組合梁; 抗火性能; 閉口壓型鋼板; 抗剪栓釘
中圖分類號:TU398. 7 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2023)12-0001-06
DOI:10. 19701 / j. jzjg. 20210685
Fire-resistant experimental study on fire and corrosion resistant steel-concrete composite beams
WANG Wenhao1, YU Xianglin1, CHENG Yun1, SHI Yongjiu1, PANG Yiukwong2, LIU Guanghui2
(1 Department of Civil Engineering, Tsinghua University, Beijing 100084, China;2 P&Ls′ Steel Structure Applied Technology Co. , Ltd. , Zhuhai 519040, China)
Abstract: The profiled steel deck in steel-concrete composite beams is normally used as formworks instead of compositecomponents. In order to meet the demand of fire and safety, it is necessary to apply thick fire-protection coating whichmakes it difficult to maintain in the life period of composite beam. The application of high performance fire and corrosionresistant steel provides a new solution to improve the fire resistance of composite beams. Fire resistance tests were carriedout on two primary beams where the steel beam is parallel to the rib of profiled steel deck, and one secondary beam wherethe steel beam is perpendicular to the rib of profiled steel deck. The furnace temperature, specimen temperature, deflectionand strain were monitored during the test. The results show that the fire resistance of primary beam is significantly betterthan that of secondary beam under the same load. At the end of the test, the deformation of composite beams did not changerapidly. Under the same conditions, mechanical properties and fire resistance of composite beams are closely related to thetemperature development of steel beams, studs and concrete floors. The overall bending deformation occurs in all compositebeams, and the deformation rate is related to the vertical load and temperature distribution.
Keywords:fire and corrosion resistant steel; composite beam; fire-resistant; encased profiled steel deck; shear stud
∗國家自然科學(xué)基金項(xiàng)目資助(51890903).
第一作者:王文昊,博士,主要從事高性能組合結(jié)構(gòu)抗火性能研究,Email:wh-wang19@ mails. tsinghua. edu. cn.
[引用本文] 王文昊,余香林,程赟,等. 耐火耐候鋼-混凝土組合梁抗火性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),2023,53(12):1-6. WANG Wenhao,YU Xianglin,CHENG Yun, et al. Fire-resistant experimental study on fire and corrosionresistant steel-concrete composite beams[J]. Building Structure,2023,53(12):1-6
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