| 摘要: |
| 对36个Q460高强钢试件进行单调拉伸与循环拉伸下的力学性能试验，探讨开孔数量、开孔位置和加载制度对Q460高强钢试件破坏特征、极限抗拉强度、应力循环特征和耗能能力的影响规律.结果表明：孔洞对Q460高强钢试件的力学性能具有显著影响；开孔试件在孔洞周围出现明显的应力集中现象；未开孔试件的应力-应变曲线更为饱满，且未开孔试件的耗能能力和断后伸长率远大于开孔试件；相较于沿试件长轴方向的孔洞，沿试件短轴方向的孔洞对试件力学性能的影响更为显著；对于相同开孔数量和开孔位置的试件，其耗能能力随加载应变幅值增量的增大而减小. |
| 关键词: Q460高强钢 开孔钢板 循环拉伸 耗能 |
| DOI：10.3969/j.issn.1007-9629.2021.06.022 |
| 分类号:TU391 |
| 基金项目:国家自然科学基金资助项目（51778248）； 福建省自然科学基金资助项目（2018J01075）； 福建省高校杰出青年科研人才培育计划； 华侨大学研究生科研创新基金资助项目（18013086021）. |
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| Mechanical Properties of Q460 High-Strength Steel with Holes under High-Strain Cyclic Tensile Loading |
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LUO Wenwei1, LI Haifeng1,2, CAO Baoan1
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1.College of Civil Engineering， Huaqiao University， Xiamen 361021， China;2.Key Laboratory for Intelligent Infrastructure and Monitoring of Fujian Province， Huaqiao University， Xiamen 361021， China
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| Abstract: |
| The mechanical properties of Q460 high-strength steel specimens were tested under both monotonic and repeated tensile loading. The quantity of holes， the position of holes and the loading patterns were set as the main factors to explore their influence on failure mode， ultimate tensile strength， stress cycling characteristic and energy dissipation capability of specimens. Experimental results show that the opening holes have a significant effect on mechanical properties of Q460 specimen. Specimens with holes present obvious stress concentration phenomenon around the holes. The energy dissipation capacity and elongation of unopened specimens are much greater than those of specimens with holes. Compared with the holes along the long axis of specimen， the holes along the short axis have a more significant effect on mechanical properties of Q460 steel. Furthermore， with the same quantity of openings and opening positions， the strain amplitude of loading pattern has a greater influence on mechanical properties of specimen， and the energy dissipating capacity decreases with the increase of the strain amplitude. |
| Key words: Q460 high-strength steel opening steel plate cyclic tensile loading energy dissipation |
