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RIGIDITY EVALUATION OF PRE-STRESSED RUBBER BEARINGS FOR LONG SPAN ROOFS

In this paper, two effective improvements, to prevent pull-out of anchor bolts and crush of base mortar, are to be proposed. The first improvement was to introduce disk springs between the base plate and the anchor bolt nuts, to prevent pull-out of the anchor bolts. The second improvement was to insert an elastic rubber plate between the base plate and mortar, to avoid the crush of mortar. Based on the test results, the evaluation method of the rotational stiffness, which can be calculated by stiffness of pre-stressed-force, disk spring and anchor bolts and rubber rotational spring constant, will be proposed.