組合式箍筋雙筋混凝土梁受力性能試驗研究*
林 峰，張 智，韋 恒
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（同濟大學(xué)建筑工程系，上海200092）[摘要] 組合式箍筋是預(yù)制裝配整體式混凝土結(jié)構(gòu)施工關(guān)鍵技術(shù)之一。為驗證組合式箍筋的上部箍肢是否可有效約束雙筋梁上部受壓鋼筋，制作13根梁進行對比試驗研究。試驗中受壓鋼筋達到或接近屈服。結(jié)果表明，與常規(guī)封閉箍筋相比，采用組合式封閉箍筋的雙筋梁受彎和受剪性能與普通封閉式箍筋梁接近。梁受彎破壞時受壓縱筋被組合式箍筋有效約束，受壓鋼筋沒有發(fā)生失穩(wěn)現(xiàn)象。[關(guān)鍵詞] 組合式箍筋;雙筋梁;受彎性能;失穩(wěn)破壞中圖分類號：TU375 文獻標識碼：A 文章編號：1002-848X(2013)S1-0649-04Experimental study on mechanical behavior of RC beam with compression reinforcement using overlapping hoopsLin Feng, Zhang Zhi, Wei Heng(Department of Building Engineering, Tongji University, Shanghai 200092, China)Abstract: Overlapping hoops are often used in precast concrete structures for the convenience of construction. However, it is not clear whether the steel bars in compression can be effectively constrained by the two separated parts of the hoops. To clarify this, in total 13 concrete beams were casted and experimentally studied with their compression reinforcements almost being of yield. It was found that, the mechanical behavior of the beam with overlapping hoops is almost the same as the ones using normal closed hoops. The steel bars in compression can be effectively constrained by the overlapping hoops, as the steel bars do not fail due to unstability.Keywords: overlapping hoops;RC beams;flexural behavior;local failure modes
