GFRP圆管脚手架节点承载能力试验与有限元研究
|
摘要
要将复合材料圆管用于脚手架结构必须解决杆件与杆件之间的连接问题,由于GFRP圆管横向强度低,因此需要研究将传统钢扣件应用于GFRP圆管连接时杆件节点的力学性能。本文首先通过不加垫层扣件和加垫层扣件对GFRP圆管施加预紧扭矩,得出GFRP圆管在两种不同扣件下的承载规律;其次在预紧力试验基础上进行抗滑移试验,研究了垫层对节点抗滑承载能力的影响;最后建立了节点有限元模型,通过建立的有限元模型对中间垫层的厚度进行优化。研究表明:增加半圆形钢垫层可以大幅度提高GFRP圆管可承受的预紧扭矩,并改善GFRP圆管的受力分布,并且抗滑移承载力提高约26. 3%。同时通过有限元可得垫层厚度取3. 5 mm较为适宜。
To apply composite tubes to the scaffolding structure,the problem of connection between members should be settled. Seeing the low transverse strength of GFRP tubes,we need to study the mechanical properties of member nodes when applying traditional steel fasteners to GFRP tube connection. In this paper,the author first imposed preload torque on GFRP tubes with cushion-free fasteners and cushioned fasteners and obtained therefrom the rules of bearing of GFRP tubes with two different fasteners. After that,based on the pretension test,the author performed the anti-slide test and studied the influence of cushions on the anti-slide bearing capacity of the nodes. In the end,the author established a finite element model of the nodes and optimized the thickness of the middle-layer cushions with the model built. The research demonstrated that: the increase in semicircular steel cushions could noticeably enhance the preload torque bearable for GFRP tubes,improve the distribution of force in GFRP tubes and better the anti-slide bearing capacity by about 26. 3%. In the meantime,the finite element model indicated the appropriate cushion thickness to be 3.5 mm.
To apply composite tubes to the scaffolding structure,the problem of connection between members should be settled. Seeing the low transverse strength of GFRP tubes,we need to study the mechanical properties of member nodes when applying traditional steel fasteners to GFRP tube connection. In this paper,the author first imposed preload torque on GFRP tubes with cushion-free fasteners and cushioned fasteners and obtained therefrom the rules of bearing of GFRP tubes with two different fasteners. After that,based on the pretension test,the author performed the anti-slide test and studied the influence of cushions on the anti-slide bearing capacity of the nodes. In the end,the author established a finite element model of the nodes and optimized the thickness of the middle-layer cushions with the model built. The research demonstrated that: the increase in semicircular steel cushions could noticeably enhance the preload torque bearable for GFRP tubes,improve the distribution of force in GFRP tubes and better the anti-slide bearing capacity by about 26. 3%. In the meantime,the finite element model indicated the appropriate cushion thickness to be 3.5 mm.
引文
[1]高峰,赵鹏.我国钢管脚手架的应用现状与存在问题[J].钢结构,2017(5):97-100.
[2]冯鹏.复合材料在土木工程中的发展与应用[J].玻璃钢/复合材料,2014(9):99-104.
[3]沈观林,胡更开.复合材料力学[M].第2版.北京:清华大学出版社,2013:15-17.
[4]甘春诚,边晓艳,赵玉英.玻璃纤维树脂基复合材料的研究分析[J].中国科技投资,2018(17):253.
[5]Keller T.Recent all-composite and hybrid fiber-reinforced polymer bridges and buildings[J].Progress in Structural Engineering&Materials,2010,3(2):132-140.
[6]区志刚,周庆辉.10 kV带电作业专用快装绝缘脚手架的应用[J].广东输电与变电技术,2010,12(4):53-55,59.
[7]金荣,刘幸,代涛.扣件式钢管模板支架节点半刚性模型研究[J].工业建筑,2018,48(4):153-159.
[8]胡东晋,王振山,刘云贺,等.玻璃纤维复合材料构件抗压性能研究[J].西安理工大学学报,2015,31(2):207-213.
[9]Carlos G,Llorca J.Mechanical behavior of unidirectional fiber-reinforced polymers under transverse compression:Microscopic mechanisms and modeling[J].International Journal of Solids&Structures,2007,67(13):2795-2806.
[10]钢管脚手架扣件:GB15831-2006[S].北京:中国标准出版社,2006.
[11]建筑施工扣件式钢管脚手架安全技术规范:JGJ130-2011[S].北京:中国建筑工业出版社,2011.
[12]蔡雪峰,周继忠,庄金平.钢管扣件节点抗滑性能研究[J].土木工程学报,2009,42(3):60-64.
[13]肖炽,周观根,杨乾慧.钢管支架用直角扣件抗滑移试验研究[J].施工技术,2010,39(4):85-86,93.
[14]Salehi M,Sobhani A R.Elastic linear and non-linear analysis of fiber-reinforced symmetrically laminated sector Mindlin plate[J].Composite Structures,2003,65(1).
[15]鞠苏,肖加余,江大志,等.复合材料管接头与钢管间摩擦力及其对管接头强度的影响---数值分析[J].复合材料学报,2007(3):167-172.
[16]闻邦椿.机械设计手册:第一卷[M].第5版.北京:机械工业出版社,2014:25-26.
[2]冯鹏.复合材料在土木工程中的发展与应用[J].玻璃钢/复合材料,2014(9):99-104.
[3]沈观林,胡更开.复合材料力学[M].第2版.北京:清华大学出版社,2013:15-17.
[4]甘春诚,边晓艳,赵玉英.玻璃纤维树脂基复合材料的研究分析[J].中国科技投资,2018(17):253.
[5]Keller T.Recent all-composite and hybrid fiber-reinforced polymer bridges and buildings[J].Progress in Structural Engineering&Materials,2010,3(2):132-140.
[6]区志刚,周庆辉.10 kV带电作业专用快装绝缘脚手架的应用[J].广东输电与变电技术,2010,12(4):53-55,59.
[7]金荣,刘幸,代涛.扣件式钢管模板支架节点半刚性模型研究[J].工业建筑,2018,48(4):153-159.
[8]胡东晋,王振山,刘云贺,等.玻璃纤维复合材料构件抗压性能研究[J].西安理工大学学报,2015,31(2):207-213.
[9]Carlos G,Llorca J.Mechanical behavior of unidirectional fiber-reinforced polymers under transverse compression:Microscopic mechanisms and modeling[J].International Journal of Solids&Structures,2007,67(13):2795-2806.
[10]钢管脚手架扣件:GB15831-2006[S].北京:中国标准出版社,2006.
[11]建筑施工扣件式钢管脚手架安全技术规范:JGJ130-2011[S].北京:中国建筑工业出版社,2011.
[12]蔡雪峰,周继忠,庄金平.钢管扣件节点抗滑性能研究[J].土木工程学报,2009,42(3):60-64.
[13]肖炽,周观根,杨乾慧.钢管支架用直角扣件抗滑移试验研究[J].施工技术,2010,39(4):85-86,93.
[14]Salehi M,Sobhani A R.Elastic linear and non-linear analysis of fiber-reinforced symmetrically laminated sector Mindlin plate[J].Composite Structures,2003,65(1).
[15]鞠苏,肖加余,江大志,等.复合材料管接头与钢管间摩擦力及其对管接头强度的影响---数值分析[J].复合材料学报,2007(3):167-172.
[16]闻邦椿.机械设计手册:第一卷[M].第5版.北京:机械工业出版社,2014:25-26.