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IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century


IASS Symposium 2016

SESSION: Metal Spatial Structures

Experimental study on inelastic response of bearings supporting steel roofs for cyclic loading

< Table of Contents for Metal Spatial Structures
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Metal Spatial Structures
  • Pages: 8
  • Title: Experimental study on inelastic response of bearings supporting steel roofs for cyclic loading
  • Author(s): Naoki Wada, Tetsuo Yamashita
  • Keywords: earthquake damage, roof bearing, anchor bolts, base mortar crush, shear strength
Abstract
This paper is about the cyclic loading tests of conventional pin bearings supporting steel roofs on the concrete lower structures. Such roof bearings suffered severe damage in the Pacific coast of Tohoku Earthquake that occurred in 2011. The typical damage was crack or crush of the base mortar, and break of the anchor bolts. We conducted cyclic tests to observe the fracture behaviour and the load-bearing properties of the bearings. The strength of the bearing was lower than the yield shear strength and the maximum shear strength of the anchor bolts, which was calculated according to the AIJ recommendation. The base mortar was severely crushed before reaching the yield shear strength due to inelastic bending of the anchor bolts. So far shear force has been considered dominant in anchor bolts. But it was found that the restoring force curve could be precisely enveloped by horizontal component of the axial force.

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