Feasibility Assessment of Stiff Seismic Base Absorbers

In this paper, a radically new concept of Stiff Seismic Base Absorber (SBA) is proposed for seismic protection multistory building structures. An inerter first implemented, connecting directly the structure to ground. This results in decrease natural frequency structure, without decreasing its structural stiffness. Parallel, negative stiffness-based absorber used increase apparent damping behavior inerter. The additional mass SBA connected with stiffness (NS) element and base positive one. Also, an artificial damper placed parallel each element. design includes following novel features: (1) foresees variation all elements, (2) optimal system parameters are selected based on engineering criteria proper constraints limitations dynamic responses, (3) earthquake input motion according codes, (4) displacement-dependent non-linear configuration realization NS element, (5) detuning phenomena observed via sensitivity analysis. Compared other vibration absorbers, presents several advantages. improved superstructure combined small displacements, order few centimeters. drastically reduced displacements render implementation feasible using conventional elements. As result, realistic retrofitting option protection.