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针对某钢筋混凝土框架加固案例,基于有限元软件ANSYS建立两组有限元模型,其中一组为普通钢筋混凝土框架结构,另一组对其进行抗震加固。通过CFRP加固钢筋混凝土梁,采用加大截面法加固钢筋混凝土柱,对该结构加固前后的有限元模型进行动力时程分析,对比加固前后结构的承载能力、变形能力、动力特性以及抗震性能。结果表明:加固后结构的梁板挠度小于加固前,满足结构新功能的正常使用要求;加固结构的整体楼层侧移均小于未加固结构,加固提高了结构的侧向刚度。加固后各层的层间位移角满足钢筋混凝土框架在罕遇地震作用下的层间位移角限值的要求,具有一定的安全储备。
Aiming at the reinforcement case of a reinforced concrete frame, two finite element models were established based on the finite element software ANSYS, one of them was a common reinforced concrete frame structure and the other was reinforced by aseismic reinforcement. The reinforced concrete beams strengthened by CFRP and the reinforced concrete columns strengthened by the enlarged section method were used to analyze the dynamic time-history of the finite element model of the structure before and after reinforcement. The bearing capacity, deformation capacity, dynamic characteristics and seismic performance of the structure before and after reinforcement were compared. The results show that the deflection of the slab of the strengthened structure is less than that before the reinforcement, which meets the normal requirements of the new structure of the structure. The lateral displacement of the reinforced structure is smaller than that of the unreinforced structure, which improves the lateral stiffness of the structure. After the reinforcement of the layers of the drift angle to meet the reinforced concrete framework of rare earthquakes under the action of the drift angle limit requirements, with a certain safety reserves.