New Structural Seismic Isolation System for Tower Structures

The vulnerable state of the important structures (seismically isolated structures, tall buildings, major pipelines and tunnels, large storage tanks, long-span bridges and others like this) under near-fault and long-period ground motions has been recognized worldwide during numerous strong earthquakes. Because, the assessment of long-period earthquake excitations to important structures has gained growing interest. New generation Structural Seismic Isolation Method (SSIM) and System (SSIS) developed for protecting Highly Reliable Structures (HRS) against strong earthquakes including near-fault and long-period ground motions and it is presented with application to tower structures (Ts). Particularities, assessment and efficiency of this application was illustrated. Results indicate that the responses of the SSIS tower structure (SSIS-Ts) is substantially lower than the existing structure that use the conventional oil dampers after repair (Fb-Ts). Note *1: Highly Reliable Structures (HRS) are classified as follows: 1) Nuclear Containment Structures; 2) High-rise buildings that contain information, operating systems, sensitive instruments, communication systems, routing systems, bank operating systems, data bases, management systems and other such features that are linked to the security and economy of the country; 3) High-rise hospitals; 4) Tower Structures, etc.