消能减震技术在北京工业大学图书馆加固中的应用

Application of energy dissipation technology in reinforcement of Library of Beijing University of Technology

北京工业大学图书馆因周边扩建拆除了原有结构的部分柱子和墙体,保留结构的层间刚度不满足现行抗震设计要求,采用在结构中增设板式铅剪切型阻尼器的加固方法来提高其抗震性能。首先利用SAP2000建立结构有限元模型并对其进行多遇地震下的弹性时程分析,在此基础上确定了消能减震方案;进一步对该结构在多遇及罕遇地震作用下的减震效果进行分析验证。结果表明,经消能减震加固后的结构,其层间位移角、基底剪力等指标明显降低,层间刚度满足现行规范要求;阻尼器耗能充分,减震效果明显,结构的抗震性能显著提高,为既有框架结构消能减震加固提供了设计参考和实际案例。

Some columns and walls of the original structure are removed due to the surrounding expansion of the library of Beijing University of Technology,and the story stiffness of the retained structure does not meet the current seismic design requirements.Therefore,the structure is equipped with plate lead shear damper to improve its seismic performance.The finite element model of the structure is firstly established by SAP2000,and the elastic time history analysis subjected to small earthquakes is carried out.On this basis,the energy dissipation scheme is determined.Then,the seismic performance of the energy-dissipated structure subjected to small and rare earthquakes is further analyzed.The results show that the drift story and base shear force of the energy-dissipated structure are significantly reduced,and its story stiffness meets the requirements of existing codes.The damper has sufficient energy dissipation,obvious damping effect,and significantly improved the seismic performance of the structure.The research of this paper also provides a design reference and practical case for energy dissipation and damping reinforcement of existing frame structures.