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（同濟(jì)大學(xué)建筑工程系， 上海 200092）
［摘要］對4根體外預(yù)應(yīng)力筋加固的混凝土簡支梁進(jìn)行了單調(diào)靜載試驗，研究了其荷載-撓度曲線、裂縫開展情況以及破壞特征。結(jié)果表明：整個加載過程可分為初期彈性工作階段、帶裂縫工作階段、卸載后張拉預(yù)應(yīng)力鋼筋階段、再加載至原有裂縫重新展開階段和破壞階段；試件的破壞源自非預(yù)應(yīng)力鋼筋的受拉屈服，破壞時變形明顯，為延性破壞；相比加固前，加固后低強(qiáng)度混凝土（C15）梁承載力平均提高了1-08倍，而對比混凝土（C35）梁承載力則平均提高了1-94倍；低強(qiáng)度混凝土梁裂縫開展情況與對比混凝土梁類似。采用預(yù)應(yīng)力筋對低強(qiáng)度混凝土梁進(jìn)行體外預(yù)應(yīng)力加固起到了預(yù)期的加固效果。
［關(guān)鍵詞］體外預(yù)應(yīng)力加固； 低強(qiáng)度混凝土； 試驗研究
中圖分類號：TU375-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)06-0031-04
Experimental study on low strength concrete simply supported beam reinforced by external prestressing
Cai Huiju, Zhou Jianmin
(Department of Building Engineering, Tongji University, Shanghai 200092, China)
Abstract:The monotonic static load test of 4 concrete simply supported beams strengthened with external prestressing tendons was carried out. The load-deflection curve, crack propagation and failure characteristics were studied. The results show that the whole loading process includes the initial elastic working stage, working stage with the crack and the stage when to stretch the prestressed tendons after unloading to redevelop the original cracks in re-loading stage, and failure stage. Specimen damage comes from the tension yield of non-prestressed tendons, and the ductile failure deformation is obvious. Compared with ultimate load before the reinforcement, bearing capacity of low strength reinforced concrote (C15) beams after reinforcement is improved by 1-08 times, while the bearing capacity of concrete(C35) beam is improved by 1-94 times. The crack development of low strength concrete beam is similar to comparison beams. The external prestressing reinforcement on low strength concrete beams realizes the expected reinforcement effect.
Keywords:external prestressing reinforcement; low strength concrete; experimental study
*國家重點(diǎn)研發(fā)計劃項目（2016YFC0700700）。
作者簡介：蔡惠菊,碩士,講師，Email:caihuiju@#edu.cn。
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