消能减震加固技术在既有建筑改造工程中的应用

Application of energy dissipation reinforcement technology in an existing building transformation project

既有建筑为原北京市商标厂印刷车间,改造后功能为小学校教学楼,采用黏滞阻尼器进行消能减震加固。对与消能减震部件相连的构件进行加固,其他部位仅需要少量加固即可满足抗震性能要求,减少了对结构构件的直接加固的工作量。采用SAP2000软件对结构进行小震下FNA(快速非线性)时程分析,为校核计算附加阻尼比的准确性,对比了一周能量比法和模态耗能比法的计算结果。采用SUASAGE软件对结构进行大震弹塑性时程分析,验算加固后结构抗震性能,并对子结构进行设计。分析结果表明,设置黏滞阻尼器对既有建筑进行消能减震加固改造,黏滞阻尼器耗能作用明显,避免了大范围的结构构件加固工作;应采用不同计算方法复核,保证附加阻尼比计算的准确性。

The existing building is the printing workshop of Beijing Trademark Factory.After the reconstruction,the function is the primary school teaching building.The fluid viscous damper was used for energy dissipation reinforcement.The members connected to the energy dissipation and damping components were reinforced,and the other parts only need a small amount of reinforcement to meet the seismic performance requirements,reducing the workload of direct reinforcement of structural members.SAP2000 software was used to carry out FNA(fast nonlinear analysis)time-history analysis of the structure under frequent earthquakes.In order to check the accuracy of the calculation of the additional damping ratio,the calculation results of the one-cycle energy ratio method and the modal energy ratio method were compared.SUASAGE software was used to carry out rare occurrence earthquake elastic-plastic time-history analysis of the structure.The seismic performance of the strengthened structure was checked,and the substructure was designed.The analysis results show that the fluid viscous damper has an obvious effect on energy dissipation of existing buildings,which avoids a large range of structural member reinforcement.Different calculation methods should be adopted for recheck to ensure the accuracy of the calculation of additional damping ratio.