【摘要】：為研究高強(qiáng)再生混凝土板與普通高強(qiáng)混凝土板受彎性能的差異,進(jìn)行了4個(gè)高強(qiáng)再生混凝土板和2個(gè)普通高強(qiáng)混凝土板足尺試件的抗彎性能對(duì)比試驗(yàn)。試件的再生混凝土粗骨料取代率100%、細(xì)骨料用天然砂,混凝土設(shè)計(jì)強(qiáng)度等級(jí)均為C65,加載方式為三分點(diǎn)單向重復(fù)加載。試驗(yàn)分析了各試件的開裂荷載、屈服荷載、極限荷載、撓度、裂縫及破壞過程。研究表明:高強(qiáng)再生混凝土板與普通高強(qiáng)混凝土板相比,受彎破壞過程類似,開裂荷載和極限荷載較接近,跨中撓度略大;設(shè)置鋼筋桁架混凝土板與普通配筋混凝土板相比,開裂后鋼筋桁架對(duì)裂縫有制約作用,板的極限荷載、后期剛度和延性有所提高;高強(qiáng)再生混凝土板承載力可近似采用混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范提供的方法,但應(yīng)乘以與再生粗骨料取代率有關(guān)的折減系數(shù),以考慮其長(zhǎng)期工作性能與短期試驗(yàn)結(jié)果的差異。
[Abstract]:In order to study the difference of flexural behavior between high-strength recycled concrete slab and ordinary high-strength concrete slab, four high-strength recycled concrete slabs and two full-scale specimens of common high-strength concrete slabs were tested. The replacement rate of recycled concrete coarse aggregate is 100%, the natural sand for fine aggregate is used, the design strength grade of concrete is C65, and the loading mode is unidirectional repeated loading at the third point. The cracking load, yield load, ultimate load, deflection, crack and failure process of each specimen are analyzed experimentally. The results show that the flexural failure process of high-strength recycled concrete slab is similar to that of ordinary high-strength concrete slab, the cracking load and ultimate load are close to each other, and the mid-span deflection is slightly larger. Compared with the ordinary reinforced concrete slab, the reinforced truss has restricted effect on the crack after cracking, the ultimate load of the slab, the rigidity and ductility of the later stage have been improved. The bearing capacity of high strength recycled concrete slabs can be approximated by the method provided by the design code for concrete structures, but the reduction factor related to the replacement rate of recycled coarse aggregate should be multiplied to take into account the difference between the long-term working performance and the short-term test results.
【作者單位】： 北京工業(yè)大學(xué)建筑工程學(xué)院;
【基金】：國(guó)家科技支撐計(jì)劃(2011BAJ08B02) 北京市自然科技基金項(xiàng)目(8132016)
【分類號(hào)】：TU375.2

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本文編號(hào)：2447187