- 摘 要
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（中國建筑科學研究院有限公司， 北京 100013）
［摘要］為研究火災高溫后鋼筋套筒灌漿接頭的力學性能，考慮不同鋼筋直徑、溫度以及高溫持續(xù)時間等因素，對鋼筋套筒灌漿接頭進行了模擬火災高溫試驗，并對高溫后接頭的變形性能及抗拉強度進行了試驗研究。結(jié)果表明，隨火災溫度的升高，接頭的殘余變形增大、抗拉強度降低，接頭破壞狀態(tài)也由鋼筋拉斷逐步向鋼筋拔出轉(zhuǎn)變；當溫度低于600℃時，接頭各項力學性能變化幅度較小，當溫度高于600℃后，接頭各項力學性能退化明顯，且高溫持續(xù)時間越長，接頭各項力學性能退化幅度越大；鋼筋直徑越大，接頭各項力學性能受高溫影響越明顯。研究結(jié)果可為裝配式結(jié)構(gòu)火災后的性能評估提供參考依據(jù)。
［關鍵詞］鋼筋套筒灌漿連接； 高溫； 火災； 殘余變形； 抗拉強度
中圖分類號：TU398-7文獻標識碼：A文章編號：1002-848X(2018)23-0038-05
Experimental study on mechanical properties of reinforced sleeve grouting joint after high temperature
Jin Qingbo, Sun Bin, Cui Dekui, Mao Shiyang, Zhang Jinfeng
(China Academy of Building Research, Beijing 100013, China)
Abstract:In order to study the mechanical properties of the reinforced sleeve grouting joint after fire high temperature, the simulated fire high temperature test was carried out on the reinforced sleeve grouting joint considering the factors of different reinforced bar diameters, temperatures and high temperature durations. The deformation performance and resistance of the joint after high temperature were also tested. The deformation and tensile strength of the joint after high temperature were studied. The results show that with the increase of fire disaster temperature, the residual deformation of the joint increases, the tensile strength decreases, and the joint failure state is also gradually transformed from the steel bar rupture to the steel bar pull\|out. When the temperature is lower than 600 ℃, the variation range of mechanical properties of the joint is small. When the temperature is higher than 600 ℃, the mechanical properties of the joints deteriorate significantly, and the longer the high temperature duration is, the greater the deterioration of the mechanical properties of the joints is. The larger the reinforced bar diameter is, the higher the mechanical properties of the joints are affected by the high temperature. The research results can provide a reference for the performance evaluation of assembled structures after fire disaster.
Keywords:reinforcement sleeve grouting joint; high temperature; fire disaster; residual deformation; tensile strength
*中國建筑科學研究院有限公司青年基金項目（20160112331030066）。
作者簡介：金慶波，學士，工程師，Email:xiaobo147@163.com。
