Dynamic Analysis of Base Isolated Connected Buildings Subjected to Seismic and Blast Induced Vibrations

In the present study, the passive control of closely spaced base isolated buildings is investigated under the effects of earthquakes and blast induced vibrations. The study advocates the installation of fluid viscous dampers to protect the closely spaced buildings against seismic and blast excitations. The performance of base isolated connected buildings is also evaluated under the selected dynamic loadings. The lead rubber isolators are designed and idealized as the Bouc Wen model. The base is dense and the rigidity of the soil, as well as the outflow of energy into the soil, is neglected. A parametric study is also conducted to determine the optimum damper properties for the base isolated connected buildings with viscous dampers. Results exhibit the efficiency of viscous dampers in reducing the structural responses of base isolated buildings. The effectiveness of the passive control technique using fluid viscous dampers in mitigating the bearing displacements of base isolated structures subjected to seismic and blast induced vibrations is also reported.