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为了获得侧面粘贴预应力碳纤维板加固混凝土梁正截面承载力的计算式,提出加固梁的破坏分为混凝土压碎和碳纤维板拉断两种模式以及相应的判别方法。分析两种破坏模式下的截面极限状态,并考虑侧面粘贴对碳纤维板加固面积的折减,提出了相应的受弯承载力计算方法。为了验证提出的计算式的正确性,在自主研发碳纤维板张拉及锚固设备的基础上完成4根预应力碳纤维板侧面加固混凝土梁试验,试验梁的破坏模式与试件设计目标相符。用所提出的计算式计算试件的受弯承载力,与试验结果相比,二者吻合较好。最后,提出侧贴预应力碳纤维板加固混凝土梁实用设计方法,可应用于实际工程的加固设计,尤其是当构件底面有管道等障碍物时。
In order to obtain the formula of the bearing capacity of the normal section of prestressed carbon fiber reinforced plastic (CFRP) reinforced concrete beams, the damage of the reinforced concrete beams is divided into two modes: concrete crushing and carbon fiber plate pull-off, and the corresponding discriminating methods. The ultimate state of the cross section under the two failure modes is analyzed, and the reduction of the reinforcement area of the carbon fiber reinforced plastic is considered, and the corresponding calculation method of the flexural capacity is proposed. In order to validate the correctness of the proposed formulas, four prestressed carbon fiber reinforced plastic (CFRP) reinforced concrete beams were completed on the basis of self-developed carbon fiber sheet tensioning and anchoring equipment. The failure mode of the test beam was in accordance with the design goals of the specimens. Calculated by the proposed calculation of flexural capacity of the specimen, compared with the test results, the two agree well. Finally, the practical design method of reinforced concrete beam with prestressed carbon fiber reinforced plastic (CFRP) is put forward, which can be applied to the reinforcement design of practical engineering, especially when there are obstacles such as pipelines on the bottom of the component.