单跨多层混凝土框架教学楼减震加固设计

摘要

为了解决既有单跨多层混凝土框架存在的结构体系不合理、抗震能力差等问题,以某典型单跨多层混凝土框架为背景,采用防屈曲支撑( buckling-restrained brace,BRB)消能减震加固技术对其进行加固。梳理应用该技术的工程技术条件、减震加固方案的设计流程以及BRB加固连接方式的工程应用条件等,对某单跨教学楼进行直连式减震加固改造,进行非线性推覆分析和时程分析,完成节点构造抗震加固设计。研究结果表明：利用该技术加固单跨框架可行,且能达到较高的抗震设防目标要求。%In order to solve the problems of the existing single-span multi-story concrete frame buildings that the structural system is unreasonable and the seismic capacity is poor, and so on, a typical single-span multi-story concrete frame with energy dissipation and seismic reduction technique by using buckling-restrained braces(BRB) was strengthened. The technical conditions of the technique and the design flow of the strengthening scheme, and the technical applying conditions of the BRB reinforcement methods, etc. was summarized. Then a single-span teaching building was strengthed with the proposed technique of which the BRB was directly connected with the original frame, and the nonlinear pushover analysis and nonlinear time history analysis were made, and the joint seismic strengthening design was completed. It shows that the proposed correlative technique is practicable to strengthen single-span concrete buildings and able to achieve the requirements of higher seismic fortification goal.