腐蚀和疲劳耦合作用下Q345角钢拟静力试验研究
|
摘要
基于环境腐蚀和疲劳振动的相互作用,建立了腐蚀疲劳耦合损伤模型,分析Q345角钢力学性能在腐蚀疲劳耦合作用下的退化规律.利用目标地区年降雨时间统计数据建立环境腐蚀模型,并将能量耗散与疲劳裂纹扩展Paris公式相结合给出衡量疲劳损伤的演化模型.与此同时,为有效衡量腐蚀与疲劳之间的相互关系提出耦合因子,并基于该因子将腐蚀和疲劳的损伤模型相结合建立腐蚀疲劳耦合损伤模型.最后,对20根规格为70mm×5mm的Q345等边角钢展开拟静力试验,分析腐蚀、疲劳及其偶合作用对角钢承载能力和耗能性能的影响规律,建立各参数耦合损伤退化模型.结果发现:腐蚀疲劳耦合作用能显著促进构件损伤的发展,但现行设计规范和研究很少考虑这种影响;Q345角钢的承载能力、滞回曲线形状和循环次数等均随腐蚀疲劳耦合作用增加发生了明显变化,加速腐蚀12h和疲劳振动4.0×104次的耦合作用使延性系数和累积耗能参数的退化率比两者单独作用造成的损伤总和多11.1%和7.7%.
The coupling damage model of corrosion and fatigue is established considering the interaction between environmental corrosion and fatigue vibration.This model is applied to study the deterioration law of the mechanical property of Q345 equal angles.Firstly,the environmental corrosion model was established according to the annual rainfall time of the target areas,and the evolutionary model for evaluating fatigue damage was presented by combining energy dissipation model with Paris formula of fatigue crack growth.Then,a coupling factor was proposed to effectively measure the relationship between corrosion and fatigue damage.Based on this coupling factor,the coupling damage model was derived by combining the corrosion and fatigue damage models.Finally,the quasi-static test of twenty Q345 equal angles with 70 mm×5 mm specification was carried out,and the effect laws of the bearing capacity and energy dissipation performance of angle steels under the corrosion,fatigue and corrosion fatigue coupling actions were analyzed,and the coupling damage degradation model of each parameter was established.The results show that the coupling action of corrosion and fatigue promote the development of component damage,but current design specifications and studies rarely consider this effect.The bearing capacity,stiffness,hysteretic curve shape and cycle times of Q345 angle steels changed obviously due to the coupling action of corrosion and fatigue.Moreover,under the coupling action of 12 hours accelerated corrosion and 4.0×104 times fatigue vibration,the degradation rates of ductility coefficient and cumulative energy dissipation parameter were 11.1% and 7.7% more than the total the damage caused by the individual action of corrosion and fatigue damage.
The coupling damage model of corrosion and fatigue is established considering the interaction between environmental corrosion and fatigue vibration.This model is applied to study the deterioration law of the mechanical property of Q345 equal angles.Firstly,the environmental corrosion model was established according to the annual rainfall time of the target areas,and the evolutionary model for evaluating fatigue damage was presented by combining energy dissipation model with Paris formula of fatigue crack growth.Then,a coupling factor was proposed to effectively measure the relationship between corrosion and fatigue damage.Based on this coupling factor,the coupling damage model was derived by combining the corrosion and fatigue damage models.Finally,the quasi-static test of twenty Q345 equal angles with 70 mm×5 mm specification was carried out,and the effect laws of the bearing capacity and energy dissipation performance of angle steels under the corrosion,fatigue and corrosion fatigue coupling actions were analyzed,and the coupling damage degradation model of each parameter was established.The results show that the coupling action of corrosion and fatigue promote the development of component damage,but current design specifications and studies rarely consider this effect.The bearing capacity,stiffness,hysteretic curve shape and cycle times of Q345 angle steels changed obviously due to the coupling action of corrosion and fatigue.Moreover,under the coupling action of 12 hours accelerated corrosion and 4.0×104 times fatigue vibration,the degradation rates of ductility coefficient and cumulative energy dissipation parameter were 11.1% and 7.7% more than the total the damage caused by the individual action of corrosion and fatigue damage.
引文
[1]史炜洲,童乐为,陈以一,等.腐蚀对钢材和钢梁受力性能影响的试验研究[J].建筑结构学报,2012,33(7):53-60.SHI Weizhou,TONG Lewei,CHEN Yiyi,et al.Experimental study on influence of corrosion on behavior of steel material and steel beams[J].Journal of Building Structures,2012,33(7):53-60.
[2]张春涛.腐蚀环境和风振疲劳耦合作用下输电塔线体系疲劳性能研究[D].重庆:重庆大学研究生院,2012.
[3]徐善华,王皓,薛南.锈蚀钢材偏心受压钢柱承载性能退化规律[J].哈尔滨工业大学学报,2016,48(6):157-163.XU Shanhua,WANG Hao,XUE Nan.Deterioration law of bearing properties of corroded eccentric steel columns[J].Journal of Harbin Institute of Technology,2016,48(6):157-163.
[4]BERETTA S,CARBONI M,CONTE A L,et al.An investigation of the effects of corrosion on the fatigue strength of AlN axle steel[J].Proceedings of the Institution of Mechanical Engineers,Part F,2008,222(2):129-143.
[5]李强,周昌玉,黄文龙,等.加载频率变化的腐蚀疲劳裂纹扩展速率数学模型[J].南京化工大学学报,2000,22(1):32-36.LI Qiang,ZHOU Changyu,HUANG Wenlong,et al.Mathematic model of corrosion-fatigue crack growth rate under consideration of frequency altering[J].Journal of NanJing University of Chemical Technology,2000,22(1):32-36.
[6]郑战光,蔡敢为,李兆军.一种新的疲劳损伤演化模型[J].工程力学,2010,27(2):37-40.ZHENG Zhanguang,CAI Ganwei,LI Zhaojun.A new model of fatigue damage evolution[J].Engineering Mechanics,2010,27(2):37-40.
[7]GHOBARAH A,ABOU-ELFATH H,BIDDAH A.Response-based damage assessment of structures[J].Earthquake Engineering&Structural Dynamics,2015,28(1):79-104.
[8]吴荫顺.金属腐蚀研究方法[M].北京:冶金工业出版社,1993:94-96.
[9]李正良,张春涛,范文亮,等.薄壁方钢管新型梁柱节点抗震性能试验研究[J].工程力学,2013,30(2):72-81.LI Zhengliang,ZHANG Chuntao,FAN Wenliang,et al.Experimental research on seismic behavior of a new type of thin-walled square steel tube beam-column connection[J].Engineering Mechanics,2013,30(2):72-81.
[10]贾斌,张其林,杨彬,等.预制框架内嵌竖缝剪力墙体系抗震性能试验[J].上海交通大学学报,2014,48(11):1580-1587.JIA Bin,ZHANG Qilin,YANG Bin,et al.Experimental study of seismic behavior of prefabricated reinforced concrete frame with infill slit shear walls[J].Journal of Shanghai Jiao Tong University,2014,48(11):1580-1587.
[2]张春涛.腐蚀环境和风振疲劳耦合作用下输电塔线体系疲劳性能研究[D].重庆:重庆大学研究生院,2012.
[3]徐善华,王皓,薛南.锈蚀钢材偏心受压钢柱承载性能退化规律[J].哈尔滨工业大学学报,2016,48(6):157-163.XU Shanhua,WANG Hao,XUE Nan.Deterioration law of bearing properties of corroded eccentric steel columns[J].Journal of Harbin Institute of Technology,2016,48(6):157-163.
[4]BERETTA S,CARBONI M,CONTE A L,et al.An investigation of the effects of corrosion on the fatigue strength of AlN axle steel[J].Proceedings of the Institution of Mechanical Engineers,Part F,2008,222(2):129-143.
[5]李强,周昌玉,黄文龙,等.加载频率变化的腐蚀疲劳裂纹扩展速率数学模型[J].南京化工大学学报,2000,22(1):32-36.LI Qiang,ZHOU Changyu,HUANG Wenlong,et al.Mathematic model of corrosion-fatigue crack growth rate under consideration of frequency altering[J].Journal of NanJing University of Chemical Technology,2000,22(1):32-36.
[6]郑战光,蔡敢为,李兆军.一种新的疲劳损伤演化模型[J].工程力学,2010,27(2):37-40.ZHENG Zhanguang,CAI Ganwei,LI Zhaojun.A new model of fatigue damage evolution[J].Engineering Mechanics,2010,27(2):37-40.
[7]GHOBARAH A,ABOU-ELFATH H,BIDDAH A.Response-based damage assessment of structures[J].Earthquake Engineering&Structural Dynamics,2015,28(1):79-104.
[8]吴荫顺.金属腐蚀研究方法[M].北京:冶金工业出版社,1993:94-96.
[9]李正良,张春涛,范文亮,等.薄壁方钢管新型梁柱节点抗震性能试验研究[J].工程力学,2013,30(2):72-81.LI Zhengliang,ZHANG Chuntao,FAN Wenliang,et al.Experimental research on seismic behavior of a new type of thin-walled square steel tube beam-column connection[J].Engineering Mechanics,2013,30(2):72-81.
[10]贾斌,张其林,杨彬,等.预制框架内嵌竖缝剪力墙体系抗震性能试验[J].上海交通大学学报,2014,48(11):1580-1587.JIA Bin,ZHANG Qilin,YANG Bin,et al.Experimental study of seismic behavior of prefabricated reinforced concrete frame with infill slit shear walls[J].Journal of Shanghai Jiao Tong University,2014,48(11):1580-1587.