既有多层砌体结构隔震加固数值模拟分析

Numerical simulation analysis of seismic isolation and reinforcement of existing multilayer masonry structures

以某4层砌体结构教学楼一层楼盖下部隔震加固工程实例为研究对象,使用SAP2000有限元软件建立该教学楼3种情况下的模型,即原有结构、1层楼盖下部隔震结构及基础隔震结构的模型,进行数值模拟,运用模态分析法和动力时程分析法对结构进行对比分析。结果表明,2种方式隔震加固后的砌体结构在地震动作用下抗震性能均明显改善,隔震装置布置合理,并且在实际应用中,结构基础不适合做基础隔震的情况下,将隔震装置布置在一层楼盖下部,同样会获得良好的隔震效果,且便于实施。

Isolation reinforcement has been widely used in Multilayer Masonry Structure to improve the seismic performance.A four-layer masonry structure in the schoolhouses＇ first-floor isolation reinforcement underneath was studied in this paper.Three types of models were developed,including the original structure,first-floor isolation reinforcement underneath and basic isolation reinforcement,The numerical simulation was performed with SAP2000.The structure was evaluated through modal analysis and dynamic time-history analysis.The result demonstrated that the structures seismic performance has been improved distinctly under the earthquake action after isolation reinforcement.Isolated bearing was posed reasonably.In addition,was compared with basic isolation,arrangement of the isolated bearing under the first floor will not only gain excellent performance of seismic isolation,but it is also convenient to implement efficiently and frugally in the practical application.