Sliding pendulum bearing and method of dimensioning such a bearing

A method for dimensioning a sliding pendulum bearing for protecting a construction against dynamic stresses from predominantly horizontal earthquake excitation, having at least a first sliding plate, a second sliding plate and a slider movably arranged between both sliding plates, wherein each of the two sliding plates has a curved main sliding surface and the slider is in surface contact with a first main sliding surface of the first sliding plate and with a second main sliding surface of the second sliding plate, wherein the first main sliding surface is designed for a first load case and the second main sliding surface is designed for a second load case which differs from the first load case, wherein the first and the second load cases represent specific peak ground acceleration values of corresponding earthquakes, and wherein the first main sliding surface has a first effective radius of curvature Reff,1 and the second main sliding surface has a second effective radius of curvature Reff,2, wherein the sum of Reff,1 and Reff,2 is at least 1.4 times the effective radius of curvature of a sliding pendulum bearing having only one curved main sliding surface.

A sliding pendulum bearing for protecting a construction against dynamic stresses from predominantly horizontal earthquake excitation, having a first sliding plate, a second sliding plate and a slider movably arranged between both sliding plates, wherein each of the two sliding plates has a curved main sliding surface and the slider is in surface contact with a first main sliding surface of the first sliding plate and with a second main sliding surface of the second sliding plate, wherein the first main sliding surface is designed for a first load case and the second main sliding surface is designed for a second load case which differs from the first load case, wherein the first and the second load cases represent specific peak ground acceleration values of corresponding earthquakes, wherein a first effective radius of curvature Reff,1 of the first main sliding surface in metres corresponds approximately to 0.25 times the square of a desired isolation cycle duration TISO in seconds of the construction to be protected with sliding pendulum bearing.

A sliding pendulum bearing for protecting a construction against dynamic stresses from predominantly horizontal earthquake excitation, having a first sliding plate, a second sliding plate and a slider movably arranged between both sliding plates, wherein each of the two sliding plates has a curved main sliding surface and the slider is in surface contact with a first main sliding surface of the first sliding plate and with a second main sliding surface of the second sliding plate, wherein the first main sliding surface is designed for a first load case and the second main sliding surface is designed for a second load case which differs from the first load case, wherein the first and the second load cases represent specific peak ground acceleration values of corresponding earthquakes, wherein the first main sliding surface has a first coefficient of friction μ1 for the friction with the slider which is approximately as large as for a sliding pendulum bearing having only one curved main sliding surface, and the second main sliding surface has a second coefficient of friction μ2 which is lower than μ1 and which is in the range from about 0.2% to 1.7% when the second main sliding surface is lubricated and in the range from about 2% to 3.5% when the second main sliding surface is not lubricated.

A sliding pendulum bearing for protecting a construction against dynamic stresses from predominantly horizontal earthquake excitation, having a first sliding plate, a second sliding plate and a slider movably arranged between both sliding plates, wherein each of the two sliding plates has a curved main sliding surface and the slider is in surface contact with a first main sliding surface of the first sliding plate and with a second main sliding surface of the second sliding plate, wherein the first main sliding surface is designed for a first load case and the second main sliding surface is designed for a second load case which differs from the first load case, wherein the first and the second load cases represent specific peak ground acceleration values of corresponding earthquakes, wherein the second main sliding surface has a limitation means for limiting the displacement capacity of the slider on the second main sliding surface, wherein the limitation means is designed in particular as an annular abutment and the limitation means does not limit the total displacement capacity of the bearing.