Rigidity evaluation of pre‐stressed rubber bearings of long‐span roofs

When The Great East Japan Earthquake of 2011 occurred, long‐span structures such as gymnasium with long‐span steel ceiling supported by RC columns was damaged as the bearings, which connected the steel roof column and the RC columns, were damaged. In this study, two effective improvements to prevent...

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Bibliographic Details
Published in:Japan architectural review 2020-01, Vol.3 (1), p.77-89
Main Authors: Morita, Akira, Honma, Keiichi, Watanabe, Yasuhiro, Nakamura, Misaki, Yamashita, Tetsuo
Format: Article
Language:English
Subjects:
Anchor bolts
bearing
Bearing steels
Bearings
Bolts
Bridges
Ceilings
Columns (structural)
Crushing
disk spring
Earthquake damage
Earthquakes
elastic rubber
Experiments
long‐span structure
Mortars (material)
Nuts
Plates (structural members)
pre‐stressed
Roofing
Roofs
Rubber
Spring constant
Springs (elastic)
Stiffness
Stress concentration
Test procedures
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Summary:When The Great East Japan Earthquake of 2011 occurred, long‐span structures such as gymnasium with long‐span steel ceiling supported by RC columns was damaged as the bearings, which connected the steel roof column and the RC columns, were damaged. In this study, two effective improvements to prevent the pull‐out of anchor bolts and crushing of base mortar are proposed. The first improvement is to add disk springs between the base plate and anchor bolt nuts, which prevents the pull‐out of anchor bolts. In the second improvement, an elastic rubber plate is inserted between the base plate and mortar to avoid mortar crushing. Based on test results, an evaluation method for rotational stiffness is proposed, which can be calculated from the stiffness corresponding to the pre‐stressed force, disk spring, anchor bolts, and rotational spring constant of the rubber. This manuscript reports constant vertical and cyclic horizontal test of pre‐stressed rubber bearings.
ISSN:2475-8876
2475-8876
DOI:10.1002/2475-8876.12138