摘要
介绍了消能子结构的研究现状,文中以某小学教学楼抗震加固工程为例,阐述了采用附加消能子结构配合屈曲约束支撑进行抗震加固的设计过程,采用阵型分解反应谱法和时程分析法分析并对比了加固前后结构的抗震性能变化,基于现有研究成果,进行了消能子结构的加固设计和罕遇地震作用下的承载力复核。结果表明:采用附加消能子结构对结构进行抗震加固,在提高建筑抗震性能的同时,可以不影响建筑内部功能。加固后,结构整体刚度增加,自振周期变短,层间剪力增大,整体变形变小,结构的整体受力状态和变形模式得到改善,房屋整体抗震性能提升。罕遇地震作用下,结构整体塑性程度较低,损伤屈服机制更加合理,可以实现“大震不倒”的设防目标。消能子结构为连接消能器和主体结构的关键构件,应重点进行设计,采用柱的N-M曲线进行承载力复核比较便捷。文中设计思路可为类似工程提供借鉴和参考。
The research status of energy dissipation substructures is introduced.Taking the seismic strengthening project of a primary school building as an example,the design process of seismic strengthening with additional energy dissipation substructures and buckling⁃restrained braces was described.The seismic performance differences of the structure before and after strengthening were analyzed and compared using modal decomposition response spectrum method and time history analysis method.Based on the existing research results,the strengthening design of energy dissipation substructure and the recheck of bearing capacity under rare earthquake were carried out.The results show that the additional energy dissipation substructure can improve the seismic performance of the building without affecting the internal function of the building.After reinforcement,the overall stiffness of the structure increases,the natural vibration period becomes shorter,and the inter story shear force increases,but the overall deformation of the structure becomes smaller,the overall stress state and deformation mode of the structure are improved,and the overall seismic performance of the house is improved.Under the action of rare earthquake,the overall plasticity of the structure is low,and the damage yielding mechanism is improved,which can achieve the fortification goal of"no collapse in a rare earthquake".The energy dissipation substructure is a key component connecting the energy dissipator and the main structure,which should be designed with emphasis.It is convenient to recheck the bearing capacity by using the N⁃M curve of the column.The design ideas in this paper can provide reference for similar projects.
作者
侯宏涛
杨立华
王琴
张鑫
Hou Hong-tao;Yang Li-hua;Wang Qin;Zhang Xin(Engineering Research Institute of Appraisal and Strengthening of Shandong Jianzhu University Co.Ltd,Ji′nan 250013,China;Shandong Jianzhu University,Ji′nan 250101,China)
出处
《工程抗震与加固改造》
北大核心
2024年第3期153-160,共8页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金重点项目(52038006)。
