Deep embedment strengthening of full-scale shear-deficient reinforced concrete beams
Deep embedment strengthening of full-scale shear-deficient reinforced concrete beams
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发表时间：
2015-12
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通讯作者：
Yaser Jemaa;Connah Jones;S. Dirar
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作者：
Yaser Jemaa;Connah Jones;S. Dirar
深埋（DE）技术是最近开发的针对现有钢筋混凝土（RC）结构的抗剪加固方法。大多数采用 DE 方法加固的 RC 梁的有效深度小于 400 mm。这并不代表 RC 梁/梁具有明显更高有效深度的几种实际情况。本文研究了全尺寸未加固和加固的 RC 梁的剪切性能。梁的有效深度约为600毫米，剪跨与有效深度之比约为3.0，并采用内部剪力钢筋进行加固。 DE 抗剪加固系统由每个剪跨内的 6 个直径为 12 毫米的涂砂玻璃纤维增强聚合物 (GFRP) 钢筋组成。 DE GFRP筋使加固梁的抗剪力能力提高了约96%。由于 DE GFRP 钢筋的存在，加固梁的抗裂刚度略高，可以抵抗倾斜裂缝张开，从而控制挠度。加固梁中的主剪裂坡度较陡。对于采用轻钢抗剪钢筋的加固梁，结果表明总剪力能力可以计算为混凝土、钢材和 FRP 贡献的总和。
The deep embedment (DE) technique is a recently developed shear strengthening method for existing reinforced concrete (RC) structures. The majority of RC beams strengthened using the DE method had effective depths of less than 400 mm. This is unrepresentative of several practical situations where RC girders/beams have significantly higher effective depths. This paper examines the shear behaviour of full-scale unstrengthened as well as strengthened RC Tbeams. The beams had an effective depth of about 600 mm, a shear span to effective depth ratio of about 3.0, and were reinforced with internal steel shear reinforcement. The DE shear strengthening system consisted of six 12 mm diameter sand-coated glass fibre reinforced polymer (GFRP) bars in each shear span. The DE GFRP bars enhanced the shear force capacity of the strengthened beam by about 96%. The strengthened beam had a slightly higher cracked stiffness due to the presence of the DE GFRP bars which resisted inclined crack opening and consequently controlled deflection. The main shear crack in the strengthened beam had a steeper inclination. For strengthened beams with light steel shear reinforcement, the results suggest that the total shear force capacity can be calculated as the sums of the concrete, steel, and FRP contributions.