不锈钢管中管钢管混凝土抗剪性能试验研究
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摘要
冰荷载是严寒地区海洋平台的主控荷载,对海洋平台导管腿抗剪承载力要求较高。为研究影响不锈钢管中管钢管混凝土海洋平台导管腿抗剪承载力的因素,共制作了18根管中管钢管混凝土抗剪构件,研究外钢管材料、混凝土强度、空心率和剪跨比对管中管钢管混凝土抗剪承载力的影响。通过研究不同情况下构件破坏形态、承载能力、局部应变关系来分析试件内部变化情况发现:随着空心率的减小、混凝土强度的增加,构件抗剪强度均有所增大;剪跨比越大,其抗剪强度越小。结合试验情况,提出了管中管钢管混凝土抗剪承载力经验公式,并通过ABAQUS有限元建模软件进行分析验证,结果表明模拟与试验结果吻合良好。
Ice load is considered the design control load in cold regions,which demands a high shear capacity of offshore platform legs to resist shear loads. In the research on the influential elements of concrete-filled double stainless-steel tubular column used as offshore platform legs,18 specimens have been prepared to analyze the influence of the material of the outer tube,the strength of concrete,hollow ratio,and shear span ratio on the shear bearing capacity. The failure mode,bearing capacity and local strain relationship of components were investigated under different situations. The results indicate that the decrease of the hollow ratio and increase of the concrete strength can influence the shear strength of components. The larger the shear span ratio is,the smaller the shear strength. In addition,the empirical equation for calculating the shear bearing capacity of concrete-filled double stainless-steel tubular column is recommended and the finite element analysis utilizing ABAQUS is presented to simulate the specimens. The simulation results are consistent with the test results.
Ice load is considered the design control load in cold regions,which demands a high shear capacity of offshore platform legs to resist shear loads. In the research on the influential elements of concrete-filled double stainless-steel tubular column used as offshore platform legs,18 specimens have been prepared to analyze the influence of the material of the outer tube,the strength of concrete,hollow ratio,and shear span ratio on the shear bearing capacity. The failure mode,bearing capacity and local strain relationship of components were investigated under different situations. The results indicate that the decrease of the hollow ratio and increase of the concrete strength can influence the shear strength of components. The larger the shear span ratio is,the smaller the shear strength. In addition,the empirical equation for calculating the shear bearing capacity of concrete-filled double stainless-steel tubular column is recommended and the finite element analysis utilizing ABAQUS is presented to simulate the specimens. The simulation results are consistent with the test results.
引文
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[2]REN Qingxin,ZHOU Kan,HOU Chao,et al.Dune sand concrete-filled steel tubular(CFST)stub columns under axial compression:experiments[J].Thin-walled structures,2018,124:291-302.
[3]LAI M H,HO J C M.Axial strengthening of thin-walled concrete-filled-steel-tube columns by circular steel jackets[J].Thin-walled structures,2015,97:11-21.
[4]丁敏,汪友弟,代春晖,等.钢管混凝土轴心受压构件的徐变预测模型及其徐变性能分析[J].工程力学,2017,34(6):166-177.DING Min,WANG Youdi,DAI Chunhui,et al.Creep calculation and behavior analysis of concrete-filled steel tubular member under axial compression[J].Engineering mechanics,2017,34(6):166-177.
[5]YANG Youfu,CAO Kai,WANG Tianzheng.Experimental behavior of CFST stub columns after being exposed to freezing and thawing[J].Cold regions science and technology,2013,89:7-21.
[6]HAN Linhai,HUANG Hong,TAO Zhong,et al.Concretefilled double skin steel tubular(CFDST)beam-columns subjected to cyclic bending[J].Engineering structures,2006,28(12):1698-1714.
[7]张扬,陈兵,赵社戌,等.圆钢管粉煤灰混凝土短柱轴压试验的数值模拟[J].上海交通大学学报,2017,51(7):769-773.ZHANG Yang,CHEN Bing,ZHAO Shexu,et al.Numerical simulation of axially loaded circular steel tubular stub columns with fly ash concrete infill[J].Journal of Shanghai Jiao Tong University,2017,51(7):769-773.
[8]HAN Linhai,LI Wei,BJORHOVDE R.Developments and advanced applications of concrete-filled steel tubular(CFST)structures:members[J].Journal of constructional steel research,2014,100:211-228.
[9]肖从真,蔡绍怀,徐春丽.钢管混凝土抗剪性能试验研究[J].土木工程学报,2005,38(4):5-11.XIAO Congzhen,CAI Shaohuai,XU Chunli.Experimental study on shear resistance performance of concrete filled steel tube columns[J].China civil engineering journal,2005,38(4):5-11.
[10]钱稼茹,崔瑶,方小丹.钢管混凝土柱受剪承载力试验[J].土木工程学报,2007,40(5):1-9.QIAN Jiaru,CUI Yao,FANG Xiaodan.Shear strength tests of concrete filled steel tube columns[J].China civil engineering journal,2007,40(5):1-9.
[11]蔡健,梁伟盛,林辉.方钢管混凝土柱抗剪性能试验研究[J].深圳大学学报(理工版),2012,29(3):189-194.CAI Jian,LIANG Weisheng,LIN Hui.Experimental study on shear resistance performance of concrete filled square steel tubular columns[J].Journal of Shenzhen University(science and engineering),2012,29(3):189-194.
[12]余敏,谢佳新,查晓雄,等.实空心钢管混凝土抗剪承载力统一计算方法[J].武汉大学学报(工学版),2017,50(6):829-835.YU Min,XIE Jiaxin,ZHA Xiaoxiong,et al.A unified formula for solid and hollow concrete-filled steel tube columns under shear[J].Engineering Journal of Wuhan University,2017,50(6):829-835.
[13]吉伯海,傅中秋,瞿涛,等.钢管轻集料混凝土抗剪承载力试验研究[J].土木工程学报,2011,44(12):25-33.JI Bohai,FU Zhongqiu,QU Tao,et al.Experimental study of the shear strength of lightweight aggregate concrete filled steel tube[J].China civil engineering journal,2011,44(12):25-33.
[14]张纪刚,王剑阁,韩永力.用于海洋平台结构的钢管混凝土摇摆柱构造性能试验研究[J].北京工业大学学报,2015,41(7):1028-1034,1042.ZHANG Jigang,WANG Jiange,HAN Yongli.Experimental research of CFST rocking columns used in offshore platform[J].Journal of Beijing University of Technology,2015,41(7):1028-1034,1042.
[15]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T 228.1-2010,金属材料拉伸试验第1部分:室温试验方法[S].北京:中国标准出版社,2011:21-25.General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China,China National Standardization Administration.GB/T 228.1-2010,Metallic materials-tensile testing-part 1:method of test at room temperature[S].Beijing:Standards Press of China,2011:21-25.
[16]蔡绍怀.现代钢管混凝土结构[M].2版.北京:人民交通出版社,2007.CAI Shaohuai.Modern steel tube confined concrete structures[M].2nd ed.Beijing:China Communications Press,2007.
[17]张玉芬.复式钢管混凝土轴压性能及节点抗震试验研究[D].西安:长安大学,2010.ZHANG Yufen.Study on axial compressive behavior of the composite CFST and seismic research on RC beam-column connections[D].Xi'an:Chang'an University,2010.