既有框架结构基于构件的抗震加固细部构造研究

Study on Detail Structure of Component-based Seismic Strengthening of Existing Frame Structures

为解决既有框架结构基于构件的抗震加固时钢筋过密、混凝土浇筑不密实、抗剪不足、纵向受力钢筋锚固不足等节点区出现的问题,提出节点区扩大、节点区打开、节点区预制包钢、节点区新增柱帽等措施,以提高框架结构节点区抗震能力,技术简单易实施,能有效解决框架结构抗震加固中细部构造难问题,对同类的既有框架结构抗震加固具有较大的借鉴意义。研究结果表明:框架结构节点区细部构造被大大简化,且明显提高了抗震能力,满足现行规范。

To solve the problems in the joint area of the existing frame structure during the component-based seismic reinforcement, such as over dense reinforcement, non-dense concrete pouring, insufficient shear resistance, and insufficient anchorage of longitudinal force-bearing reinforcement, the measures such as expansion of the joint area, opening of the joint area, prefabrication of steel cladding in the joint area, and addition of column caps in the joint area are proposed to improve the seismic capacity of the joint area of the frame structure. The technique is simple and easy to implement, which can effectively solve the problem of difficult details in the seismic strengthening of frame structures, and has great reference significance for the seismic strengthening of similar existing frame structures. The results show that the detail structure of the joint area of the frame structure is greatly simplified, the seismic capacity is significantly improved, and the current specifications are met accordingly.