A roller type base isolation device with tensile strength

Numerical Study on Seismic Response of Steel Storage Racks with Roller Type Isolator

“…Each of the racks shown above ( Figure 1) was analyzed fixed at its base and with base isolation. For the latter, a base isolation device of the rolling type with tensile strength was considered [25]. For each of the racks with base isolation, five different isolation periods were considered: T I = 3, 3.5, 4, 4.5 and 5 s. To evaluate the effect of the dissipation capacity of the isolation device on the response of the rack, three friction coefficients were considered on the device's ball joint (Figures 2 and 3), where µ = 0.2, 0.4 and 0.6.…”

“…In this way, the weight or vertical load transmitted by the structure to the isolator does not interact with the device's lateral stiffness, since it does not affect its lateral balance. Therefore, the lateral stiffness is defined only by the tension of the post-tensioned elastic element [25], corresponding to the compressed air piston that forms the body of the isolator (Figure 2).…”

“…Considering the approximation R = H, the elongation of the elastic element inside the isolator is defined by the following equation [25]:…”

“…Finally, the effect of nonuniform bending on the lateral torsional buckling of steel beams with slender crosssection at elevated temperatures was studied by Couto et al [24]. In this research, the influence of fire in local buckling using a numerical model obtained a new factor for design procedure according to Eurocode 3. In this research, the seismic behavior of base isolated racks is studied using a rollertype device with tensile strength [25,26]. This device is connected at the base of the structure by means of a flexible cable attached to a post-tensioned element inside the device, which gives it lateral stiffness.…”

“…The device is vertically very rigid, and its lateral stiffness is controlled by the tension of a post-tensioned element inside it. The evaluated device offers baseline isolation in both directions of analysis [25]. The main objective of this research is to evaluate the effectiveness of the use of base isolation in reducing seismic demand, through a numerical study of racks with both fixed and isolated bases subjected to Chilean earthquakes.…”