近海大气环境作用下钢框架节点时变地震损伤研究
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摘要
已服役的结构由于所处的环境作用,其构件力学性能必将随时间不断劣化。基于12个不同锈蚀程度钢框架节点的低周往复试验,分析近海大气环境作用导致钢框架节点构件力学性能的劣化。考虑到钢框架节点在地震作用变形达不到其变形极限,因而不适宜采用变形能力作为参数评价其损伤程度。刚度指标能够反映构件承载力与变形两个性能指标,且构件的变形与其刚度成反比,建立能够考虑构件因环境作用而引起的初始损伤的基于构件刚度与耗能的双参数地震损伤模型。由试验数据回归得到构件的刚度与累积耗能能力与锈蚀率线性相关,并验算损伤模型的计算精度。研究表明:建立的损伤模型具有较高的计算精度,且计算方便,适用于对地震作用下的钢框架节点进行损伤描述。在损伤模型的基础之上,假定构件年锈蚀率相同,建立构件考虑环境作用的时变损伤模型。
Due to environmental effects,mechanical properties of structures deteriorate with time.Based on low cycle tests of 12 steel frames with varying degrees of corrosion,the deterioration of mechanical properties of steel frame joints was analyzed.Considering that the deformation of steel frame joints is less than the deformation limit,it is not suitable to evaluate the degree of damage of the steel frame.The stiffness index can reflect two performance indexes of the bearing capacity and the deformation of the member,and the deformation of the member is inversely proportional to its stiffness.A two-parameter seismic damage model based on component stiffness and energy dissipation was established to consider the initial damage caused by environmental factors.The stiffness of the component and the cumulative energy dissipation capacity were linearly related to the corrosion rate.The computational accuracy of the damage model was checked by the regression of the experimental data.The results showed that the damage model had high computational accuracy and was easy to calculate,and it was suitable for damage description of steel frame joints under earthquake actions.Based on the damage model,it was assumed that the annual corrosion rate of the components was the same,and the time-varying damage model considering the environmental action was established.
Due to environmental effects,mechanical properties of structures deteriorate with time.Based on low cycle tests of 12 steel frames with varying degrees of corrosion,the deterioration of mechanical properties of steel frame joints was analyzed.Considering that the deformation of steel frame joints is less than the deformation limit,it is not suitable to evaluate the degree of damage of the steel frame.The stiffness index can reflect two performance indexes of the bearing capacity and the deformation of the member,and the deformation of the member is inversely proportional to its stiffness.A two-parameter seismic damage model based on component stiffness and energy dissipation was established to consider the initial damage caused by environmental factors.The stiffness of the component and the cumulative energy dissipation capacity were linearly related to the corrosion rate.The computational accuracy of the damage model was checked by the regression of the experimental data.The results showed that the damage model had high computational accuracy and was easy to calculate,and it was suitable for damage description of steel frame joints under earthquake actions.Based on the damage model,it was assumed that the annual corrosion rate of the components was the same,and the time-varying damage model considering the environmental action was established.
引文
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[2]郑山锁,王晓飞,孙龙飞,等.酸性大气环境下多龄期钢框架节点抗震性能试验研究[J].建筑结构学报,2015,36(10):20―28.Zheng Shansuo,Wang Xiaofei,Sun Longfei,et al.Experimental research on seismic behavior of multi-aged steel frame joint under acidic atmospheric environment[J].Journal of Building Structures,2015,36(10):20―28.(in Chinese)
[3]郑山锁,张晓辉,王晓飞,等.近海大气环境下多龄期钢框架柱抗震性能的试验研究[J].土木工程学报,2016,49(4):69―77.Zheng Shansuo,Zhang Xiaohui,Wang Xiaofei,et al.Experimental research on seismic behaviors of multi-aged steel frame columns in the offshore atmospheric environment[J].China Civil Engineering Journal,2016,49(4):69―77.(in Chinese)
[4]刘新,时虎.钢结构防腐蚀和防火涂装[M].北京:化学工业出版社,2005:20―79.Liu Xin,Shi Hu.Anti-corrosive and fireproof paint of steel structures[M].Beijing:Chemical Industry Press,2005:20―79.(in Chinese)
[5]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 steel on influence of corrosion on behavior of material and steel beams[J].Journal of Building Structures,2012,33(7):53―60.(in Chinese)
[6]潘典书.锈蚀H型钢构件受弯承载性能研究[D].西安:西安建筑科技大学,2009.Pan Dianshu.Corrosion of H-Steel components bending load performance[D].Xi’an:Xi’an University of Architecture and Technology,2009.(in Chinese)
[7]钟宏伟.锈蚀H型钢构件偏心受压性能研究[D].西安:西安建筑科技大学,2010.Zhong Hongwei.Corrosion of H-Steel components eccentric compression performance[D].Xi’an:Xi’an University of Architecture and Technology,2010.(in Chinese)
[8]Park Y J,Ang A.Mechanistic seismic damage model forreinforced concrete[J].Journal of Structural Engineering,1985,111(4):740―756.
[9]牛荻涛,任利杰.改进的钢筋混凝土结构双参数地震破坏模型[J].地震工程与工程振动,1996,16(4):44―54.Niu Ditao,Ren Lijie.A modified seismic damage model with double variables for reinforced concrete structures[J].Earthquake Engineering and Engineering Vibration,1996,16(4):44―54.(in Chinese)
[10]王东升,冯启民,王国新.考虑低周疲劳寿命的改进Park-Ang地震损伤模型[J].土木工程学报,2004,37(11):41―49.Wang Dongsheng,Feng Qimin,Wang Guoxin.A model Park-Ang seismic damage model considering low-cycle fatigue life[J].China Civil engineering Journal,2004,37(11):41―49.(in Chinese)
[11]郑山锁,王晓飞,韩言召.酸性大气环境下锈蚀钢框架柱双参数地震损伤模型研究[J].工程力学,2016,33(7):129―135.Zheng Shansuo,Wang Xiaofei,Han Yanzhao.Study on dual-parameter seismic damage model of corroded steel frame columns in acidic[J].Engineering Mechanics,2016,33(7):129―135.(in Chinese)
[12]徐强.既有与改进节点形式的钢框架结构抗震性能评估[D].西安:西安建筑科技大学,2014.Xu Qiang.Seismic performance evaluation of steel frame structures of existing and modidied joints form[D].Xi’an:Xi’an University of Architecture and Technology,2014.(in Chinese)