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| Tests for effects of lateral tenon and mortise tightness on aseismic performance of step through tenon joints |
| SU Haihong1,2, GAO Yonglin2,3, TAO Zhong3, SU Hexian3, ZHANG Qing3 |
1.Faculty of Management and Economics, Kunming University of Science and Technology, Kunming 650500, China;
2.Faculty of Architecture and Urban Planning, Kunming University of Science and Technology, Kunming 650500, China;
3.Earthquake Engineering Institute, Yunnan province, Kunming 650500, China |
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Abstract Through controlling constant width mortise,and change width tenon of step through tenon node model,make three models,which are loose nodetight node,moderate node, tight node loose node. Research on lateral closeness between mortise and tenon of joints effects on the seismic performance by low-cyclic reversed loading tests.At the same time, through use of the simple moire technique (5mm x 5mm grid), the phenomenon and process of insertion of tenon during tests are observed. The results show: The lateral closeness has great influence on node energy consumption, ultimate bearing capacity, initial stiffness and ductility, and the closer of mortise-tenon, the more obvious of the brittle character. Ultimate bearing capacity relationships: Tight node model > Moderate node model > Loose node model; Initial stiffness size relationships: Tight node model > Moderate node model > Loose node model; Equivalent viscous damping coefficient size relationships: Moderate node model > Tight node model > Loose node model；Tight node model ductility is bad, brittleness is obvious, the positive limit angle was only 0.08rad and the reverse limit was 0.06rad, and the minimum limit angle of both loose and moderate node models reached 0.12rad .easy ductility is good.
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Received: 21 March 2019
Published: 28 July 2020
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