天津某风貌建筑抗震加固的思考

Reflect on the method of a seismic strengthened historic building

对天津某已加固的风貌建筑加固前、楼板改造后和墙体加固后的抗震性能进行了比较,通过对比分析指出了结构体系性能的变化,详细阐述了加固中对原有木楼板的刚性化改造改变了原结构体系的地震剪力分配,并使得墙体加固后刚度的变化进一步影响墙体的受力,最终导致个别墙体经过加固后依然存在安全隐患。提出对含木结构楼(屋)盖的砖木结构风貌建筑不应改变原有结构体系楼板刚度,而应在不影响刚度的情况下只进行强度的加固处理的建议。

The seismic behavior of a strengthened historic building in three different phrases： before reinforcement,after substitution for floor and after reinforcement,was compared.The analysis results indicate the change of structural performance.The rigidity change of existing wooden floor changes the distribution of shear force in the original system,the further influence of wall stress is caused by wall reinforcement,and they eventually,leads to the security problems of some walls after the reinforcement.A method of strengthening masonry-timber structure with wooden floor is proposed.