厦门市某中学教学楼首层柱顶隔震抗震加固设计研究

Design and Sdudy on Seismic Strengthening with First-floor Isolation of a Teaching Building in Xiamen

底层大空间的框架结构是中小学、幼儿园及医院等生命线工程常见的结构形式,首层柱顶隔震由于其减震效果好、对原结构构件的加固量小,因此其是这类结构抗震加固的一种较好的方式,但其实际应用较少,为较为全面地阐述其在抗震加固中的应用,对厦门某首层架空的10层中学教学楼进行隔震设计与分析,同时对有关的结构、构造设计进行讨论。时程分析表明:相对抗震结构,隔震结构基本周期显著延长;在7度地震作用下,结构受到的地震作用效应大幅降低。下部结构按7度罕遇地震内力进行设计,保证其在大震下具有一定的安全储备,验证了底层为薄弱层的该框架结构应用首层柱顶隔震在技术上可靠,工程上可行。

Frame structure with large space in first floor is a common structure form in the lifeline projects such as schools, kindergartens and hospitals. Due to the good damping effect and the small reinforcement amount to the original elements and structure, first floor isolation is a better way of such structure in seismic reinforcement. But its engineering application is rare, in order to make a more comprehensive description of it in seismic reinforcement, isolation design and analysis on a 10 -floor teaching building with large space in first floor are carried out, meanwhile, related structural and constructional designs are discussed. Results of time - history analysis show that, compared with the seismic structure, the fundamental period of the isolated structure is significantly extended; under the earthquake of 7 degree, seismic reactions of structure are reduced significantly. The substructure are designed according to the internal forces under the rare earth- quake of 7 degree, which ensure the substructure have certain safety redundancy. Analysis also shows that first -floor isolation technology appfied to the weak first -floor frame structure is reliable and feasible.