李艷艷 李曉清 蘇恒博
摘要:
為研究600 MPa高強鋼筋與混凝土粘結錨固性能,設計了72個棱柱體試件進行拉拔試驗,對600 MPa高強鋼筋粘結錨固的破壞形態及粘結應力分布進行分析,通過建立基本粘結滑移關系及位置函數,確定600 MPa高強鋼筋在混凝土結構中的粘結滑移本構關系。采用一次二階矩法進行可靠度分析,提出錨固長度設計建議。研究表明:600 MPa高強鋼筋粘結錨固的破壞形態及粘結應力分布與普通鋼筋類似且粘結錨固性能良好,《混凝土結構設計規范》(GB 50010—2010)基本錨固長度計算公式依然適用于600 MPa高強鋼筋。
關鍵詞:
高強鋼筋;粘結性能;本構關系;錨固長度
中圖分類號:TU511.32
文獻標志碼:A文章編號:16744764(2017)02001907
Abstract:
Pullout tests were carried out on 72 concrete specimens reinforced with 600 MPa high strength reinforcement to investigate the bondanchorage properties between 600 MPa high strength reinforcement and concrete. Failure pattern and bond stress distribution of specimens were studied, respectively. The bondslip constitutive relations of 600 MPa high strength reinforcement were established through basic form of bondslip and position function. Through establishing the calculation formula of ultimate bonding strength for 600 MPa high strength reinforcement, bondanchorage length was established via reliability analysis of JC. The results showed that the failure pattern, bond stress distribution between 600 MPa high strength reinforcement and other strength reinforced bars no obvious difference. Basic anchorage length formula of GB500102010 still can be applied to 600 MPa high strength reinforcement.
Keywords:
high strength reinforcement; bond properties; constitutive relations; anchorage length
鋼筋混凝土共同受力的基礎是兩者共同協調發揮作用,而共同協調的關鍵就在于粘結錨固作用。粘結錨固作用是混凝土結構研究的基本問題,隨著建筑材料及理論研究的不斷發展,鋼筋與混凝土粘結錨固問題的研究也在不斷深入。近年來,關于再生混凝土、陶粒混凝土等特殊混凝土與普通鋼筋及銹蝕鋼筋等特殊鋼筋的粘結錨固問題成為研究熱點。Prince等[1]、王晨霞等[2]研究了再生混凝土與鋼筋的粘結性能,Zhang等[3]、張歡歡等[4]研究了陶粒混凝土與鋼筋的粘結性能。同時,反復荷載、重復荷載等特殊工況以及凍融、火災等特殊環境作用下鋼筋與混凝土的粘結性能備受關注。冀曉東等[5]、Rania等[6]、Huang等[7]研究了周期荷載作用下鋼筋與混凝土的粘結退化機理,Arel等[8]、Khalaf等[9]對高溫、火災環境下鋼筋與混凝土的粘結性能進行了試驗研究。……