- 摘 要
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（1 華僑大學土木工程學院， 廈門 361021； 2 福建省結構工程與防災重點實驗室， 廈門 361021）
［摘要］對33個Q235鋼材性試件進行單向拉伸與循環(huán)拉伸加載下力學性能試驗，對比試件的應力-應變曲線、荷載-位移曲線、骨架曲線，探討試件在不同加載模式下的破壞機理、延性特征和滯回性能。試驗結果表明，Q235鋼材應力-應變曲線飽滿，表現(xiàn)出良好的延性特征；開孔試件在孔洞周圍應力集中現(xiàn)象明顯；對比無開孔試件，開孔試件的耗能能力、抗拉強度和延性大幅度降低；試件開孔個數(shù)對試驗結果有一定影響，開兩個孔試件的延性及抗拉強度優(yōu)于開一個孔的試件；試件耗能能力與加載模式的應變幅值和滯回圈數(shù)有關，試件耗能能力隨應變幅值和滯回圈數(shù)的增大而增加。
［關鍵詞］Q235鋼； 循環(huán)拉伸； 材性試驗； 骨架曲線； 耗能
中圖分類號：TU391文獻標識碼：A文章編號：1002-848X(2020)02-0107-06
Experimental study on Q235 steel with holes under monotonic and cyclic tensile loading
Xie Caixia1， Li Haifeng1,2， Lü Kunde1， Li Xia1
(1 College of Civil Engineering, Huaqiao University, Xiamen 361021, China; 2 Key Laboratory for Structure Engineering and Disaster Prevention of Fujian Province, Xiamen 361021, China)
Abstract:The mechanical properties of 33 Q235 steel specimens were tested under unidirectional tensile and repeated tensile loadings. The stress-strain curve, load-displacement curve, and skeleton curve of the specimens were compared to explore the failure mechanism, ductility characteristics and hysteresis performance of the specimens under different loading regimes. The experimental results show that the stress-strain curve of Q235 steel is full and shows good ductility characteristics; the stress concentration phenomenon is obvious around the holes of perforated specimens; compared with non-perforated specimens, the energy dissipation capacity, tensile strength and ductility of the perforated specimens were significantly reduced; the ductility and tensile strength of specimens with two holes are better than those with one hole; the energy dissipation capacity of specimens is related to the strain amplitude and hysteresis loop number of the loading regime, and the energy dissipation capacity of specimens increases with the increase of strain amplitude and hysteresis loop number.
Keywords:Q235 steel; repeated tensile loading; material properties test; skeleton curve; energy dissipation
*國家自然科學基金項目（51778248）,福建省自然科學基金面上項目（2018J01075）,華僑大學中青年教師科研提升資助計劃（ZQN-PY312）,華僑大學研究生科研創(chuàng)新基金資助項目（17014086032）。
通訊作者：李海鋒，博士，副教授，碩士生導師，Email：lihai_feng@126.com。
