极地低温下栓钉连接件受剪性能试验研究及有限元分析
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摘要
为研究栓钉连接件在极地低温下的受剪性能,利用复叠式低温冷库、自制保温装置和电液伺服压力试验机对12个栓钉连接试件进行了推出试验,同时采用ABAQUS软件对其进行有限元分析,研究了温度、栓钉直径对低温下栓钉连接件受剪性能的影响。通过试验和有限元分析得到了试件破坏模式、荷载-滑移曲线、栓钉受剪承载力及极限滑移量,结果表明:试件在低温下出现栓钉剪断和栓钉剪断-混凝土压坏混合破坏两种破坏形式;在20～-80℃范围内,随着温度的降低,栓钉受剪承载力增大而极限滑移量减小,在-60～-80℃范围内,温度变化对栓钉连接件受剪性能的影响较小;在极地低温下,随着栓钉直径增大,栓钉连接件的受剪承载力和极限滑移量增加。采用ABAQUS软件考虑低温本构的有限元分析结果与试验结果吻合程度较高,通过试验结果拟合出的荷载-滑移曲线效果良好。
Twelve push-out specimens were tested and three-dimensional nonlinear finite element analysis was conducted to investigate the shear behavior of studs under polar temperature. The equipment included large-scale cold storage, insulation box and pressure testing machine. By changing the investigated parameters including temperatures and stud diameters, the failure modes, load-slip curves, ultimate shear capacity and slip were obtained. The results show that two kinds of failure modes including stud shear and mixed failure can be distinguished. In the temperature range from 20 ℃ to-80 ℃, the shear capacity of studs increases and the ultimate slip decreases with the decrease of temperature. In the temperature range from-60 ℃ to-80 ℃, the temperature has slighter influence on the shear behavior of studs. With the increase of the stud diameter, the bearing capacity and the ultimate slip increase under polar temperatures. By using ABAQUS software and adopting cryogenic constitutive relations, the finite element analysis results and regression curves agree well with the test results.
Twelve push-out specimens were tested and three-dimensional nonlinear finite element analysis was conducted to investigate the shear behavior of studs under polar temperature. The equipment included large-scale cold storage, insulation box and pressure testing machine. By changing the investigated parameters including temperatures and stud diameters, the failure modes, load-slip curves, ultimate shear capacity and slip were obtained. The results show that two kinds of failure modes including stud shear and mixed failure can be distinguished. In the temperature range from 20 ℃ to-80 ℃, the shear capacity of studs increases and the ultimate slip decreases with the decrease of temperature. In the temperature range from-60 ℃ to-80 ℃, the temperature has slighter influence on the shear behavior of studs. With the increase of the stud diameter, the bearing capacity and the ultimate slip increase under polar temperatures. By using ABAQUS software and adopting cryogenic constitutive relations, the finite element analysis results and regression curves agree well with the test results.
引文
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[10] 侯文崎,叶梅新.低温下钢-混凝土组合结构疲劳试验和抗剪承载力[J].中南大学学报(自然科学版),2004,35(6):1025-1030.(HOU Wenqi, YE Meixin. Fatigue performance and ultimate capability of steel-concrete composite structures under low temperature[J]. Journal of Central South University (Science and Technology),2004,35(6):1025-1030.(in Chinese))
[11] 沈鹏.美国的极地资源开发政策考察[J].国际政治研究,2012,49(1):97-116.(SHEN Peng. A study of US policy toward the development of polar resources[J]. International Politics Quarterly, 2012, 49(1):97-116. (in Chinese))
[12] BSI. Eurocode 4: design of composite steel and concrete structures: part 1-1: general rules and rules for buildings: BS EN 1994-1-1[S].London: British Standards Institution, 2004.
[13] 刘麟玮.混凝土低温特性引起的预应力损失试验研究[D].天津:天津大学,2015:30- 44. (LIU Linwei. Experimental study on loss of prestress caused by characteristics of concrete under low temperatures[D]. Tianjin:Tianjin University,2015:30- 44.(in Chinese))
[14] XIE J, LI X M, WU H H. Experimental study on the axial-compression performance of concrete at cryogenic temperatures[J]. Construction & Building Materials, 2014, 72:380-388.
[15] YAN J B, LIEW J Y R, ZHANG M H, et al. Mechanical properties of normal strength mild steel and high strength steel S690 in low temperature relevant to arctic environment[J]. Materials & Design, 2014, 61(9):150-159.
[2] OLLGAARD J G, SLUTTER R G, FISHER J W. Shear strength of stud connectors in lightweight and normal-weight concrete[J]. AISC Engineering Journal, 1971, 8(2): 55- 64.
[3] SHIM C S, LEE P G, TAE-YANG YOON. Static behavior of large stud connectors[J]. Engineering Structures, 2004, 26(12): 1853-1860.
[4] KARL V D. The strength of stud shear connectors at low temperatures[J]. Canadian Journal of Civil Engineering, 1988, 15(3): 117-126.
[5] LAM D. Behavior of headed stud shear connectors in composite beam[J]. Journal of Structural Engineering, 2005, 131 (1): 96-107.
[6] XUE W C, DING M, WANG H, et al. Static behavior and theoretical model of stud shear connectors[J]. Journal of Bridge Engineering, 2008, 13(6):623- 634.
[7] 丁敏, 薛伟辰, 王骅.钢-高性能混凝土组合梁栓钉连接件抗剪性能的试验[J].工业建筑,2007,37(8):9-13.( DING Min, XUE Weichen, Wang Hua. Experiment on stud shear connectors in steel-high performance concrete composite beams[J]. Industrial Construction, 2007, 37(8):9-13.(in Chinese))
[8] 丁发兴,倪鸣,龚永智,等.栓钉剪力连接件滑移性能试验研究及抗剪承载力计算[J].建筑结构学报,2014,35(9):98-106. (DING Faxing, NI Ming, GONG Yongzhi, et al. Experimental study on slip behavior and calculation of shear bearing capacity for shear stud connectors[J]. Journal of Building Structures, 2014, 35(9):98-106. (in Chinese))
[9] 陈玲珠,李国强,蒋首超,等.高温下栓钉剪力连接件抗剪性能试验[J].同济大学学报(自然科学版),2013,41(8):1151-1157.(CHEN Lingzhu, LI Guoqiang, JIANG Shouchao, et al. Experimental studies on behavior of headed stud shear connectors at elevated temperatures[J]. Journal of Tongji University (Natural Science), 2013, 41(8):1151-1157. (in Chinese))
[10] 侯文崎,叶梅新.低温下钢-混凝土组合结构疲劳试验和抗剪承载力[J].中南大学学报(自然科学版),2004,35(6):1025-1030.(HOU Wenqi, YE Meixin. Fatigue performance and ultimate capability of steel-concrete composite structures under low temperature[J]. Journal of Central South University (Science and Technology),2004,35(6):1025-1030.(in Chinese))
[11] 沈鹏.美国的极地资源开发政策考察[J].国际政治研究,2012,49(1):97-116.(SHEN Peng. A study of US policy toward the development of polar resources[J]. International Politics Quarterly, 2012, 49(1):97-116. (in Chinese))
[12] BSI. Eurocode 4: design of composite steel and concrete structures: part 1-1: general rules and rules for buildings: BS EN 1994-1-1[S].London: British Standards Institution, 2004.
[13] 刘麟玮.混凝土低温特性引起的预应力损失试验研究[D].天津:天津大学,2015:30- 44. (LIU Linwei. Experimental study on loss of prestress caused by characteristics of concrete under low temperatures[D]. Tianjin:Tianjin University,2015:30- 44.(in Chinese))
[14] XIE J, LI X M, WU H H. Experimental study on the axial-compression performance of concrete at cryogenic temperatures[J]. Construction & Building Materials, 2014, 72:380-388.
[15] YAN J B, LIEW J Y R, ZHANG M H, et al. Mechanical properties of normal strength mild steel and high strength steel S690 in low temperature relevant to arctic environment[J]. Materials & Design, 2014, 61(9):150-159.