The seismic hazard of vulnerable regions warrants the investigation of new technologies, such as base level isolation by lead rubber bearing (LRB) devices, that can help to mitigate structural damage on seismic prone buildings. The behavior adopting such technologies can be dynamically observed in simulated environments and thus serves as a valuable metric for their feasibility. LRB base isolators are incorporated into the design of buildings to better understand how they affected a building’s seismic response while also providing information on the structural parameters. The system of each model high-rise building can be represented by the finite element package. Static as well as dynamic analysis can be conducted using response spectrum analysis (RSA) based on the seismic excitation to determine the influence of the model type in the a seismic design and the alteration in superstructure behavior. The LRB isolators can potentially diminish respective story accelerations, story inertia, and base shear. Use of LRB isolators in buildings can result in a 10–20% reduction in base shear compared to buildings. In a high-rise building between 10- to 20-story the reduction of story acceleration for response spectrum can vary between 30% on lower stories up to 70% on upper stories. The LRB systems with higher characteristic strength and relatively less isolation periods shows better productivity to minimize displacements in the bearing face for dropping structural shift. However, the LRB with comparatively lower characteristic strength and high isolation periods shows the most efficiency in controlling base shear, offering least story accelerations and consenting lower story inertia forces.

The main design parameter that controls the response of buildings with base-isolators is the lateral stiffness of the isolators (k-base). You need to conduct a trial and error analysis of your building with various k-base levels until you can get the required response (base-shear and maximum drift). The analysis can be conducted by modal analysis procedure with the design response spectrum. You may need to add viscous dampers with the isolators to reduce the maximum drift response of the structure.

Hamdy Abou-Elfath thanks for exact ans which i needed.... can you help me out with vertical load carring capacity of the isolator. .... My exact question would be, how will we understand that the selected LRB will be able to withstand the vertical load imposed on it due to the structure ?

Thank you so much for valuable infotmation

Thank you so much for valuable infotmation