钢管扣件式脚手架半刚性节点多参数模拟法
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摘要
脚手架立杆的6个自由度在扣件节点处受到水平杆和斜杆的约束,该约束强弱是架体稳定承载性能的关键因素。为确定每项约束的作用,运用单参数敏感性分析和特征值屈曲分析方法,对其在架体稳定承载力上的贡献进行测量。基于对其贡献的相对效能分析,揭示出每项约束及对应水平杆、斜杆的作用机制。根据已公布的扣件实验测试数据,进行6项约束的实际效能初步分析,提出半刚性节点的多参数模拟方法。建立不同构造类型的模型,采用长度系数法、二阶线弹性分析法,通过对比扣件的计算受力状况与实验测试时所采用的荷载条件,对多参数模拟法取值方案的前提条件进行验证。在多参数法研究的基础上,列举和分析了半刚性节点常规单参数模拟方法的缺陷和局限。
Upright tube's six degrees-of-freedom are constrained by horizontal tube and diagonal brace at the coupler connection joint,the strength of such constrains is the key factor of the stable bearing capacity of the scaffold.To determine the efficiency of the constraints,single factor sensitivity analysis and eigenvalue buckling analysis methods are applied to measure each constraints' contribution on stable bearing capacity.The efficiency analysis results of their contributions indicated the constraint mechanism of horizontal tubes and bracing tubes.Reasonable effectiveness of six constrains is tentatively researched according to the published experimental data of couplers,and then a multi-parameter simulation method of semi-rigid node is proposed.The premise condition of the multiparameter simulation method is validated by the comparison between the experimental loads and the the inner forces' calculating results of the couplers,in which effective length method and linear elastic second-order analysis method are adopted.Accompanying with the research of multi-parameter simulation method,some common deficiencies or limitations of ordinary methods which are based on single parameter assumption are listed and analyzed.
Upright tube's six degrees-of-freedom are constrained by horizontal tube and diagonal brace at the coupler connection joint,the strength of such constrains is the key factor of the stable bearing capacity of the scaffold.To determine the efficiency of the constraints,single factor sensitivity analysis and eigenvalue buckling analysis methods are applied to measure each constraints' contribution on stable bearing capacity.The efficiency analysis results of their contributions indicated the constraint mechanism of horizontal tubes and bracing tubes.Reasonable effectiveness of six constrains is tentatively researched according to the published experimental data of couplers,and then a multi-parameter simulation method of semi-rigid node is proposed.The premise condition of the multiparameter simulation method is validated by the comparison between the experimental loads and the the inner forces' calculating results of the couplers,in which effective length method and linear elastic second-order analysis method are adopted.Accompanying with the research of multi-parameter simulation method,some common deficiencies or limitations of ordinary methods which are based on single parameter assumption are listed and analyzed.
引文
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[13]建筑施工扣件式钢管脚手架安全技术规范:JGJ 130-2011[S].北京:中国建筑工业出版社,2011.Technical code for safety of steel tubular scaffold with Couplers in construction:JGJ 130-2011[S].Beijing:China Architecture&Building Press,2011.(in Chinese)
[14]GOHNERT M,LI K N,SON K S.Experimental investigation on the load capacity of a scaffolding fram[J].International Journal of Engineering and Technology,2016,8(6):2460-2467.
[15]陆征然,陈志华,王小盾,等.基于三点转动约束单杆稳定理论的扣件式钢管满堂支撑架承载力研究[J].土木工程学报,2012,45(5):104-113.LU Z R,CHEN Z H,WANG X D,et al.Study of the bearing capacity of fastener steel tube full hall formwork support using the theory of stability of pressed pole with three-point rotation restraint[J].China Civil Engineering Journal,2012,45(5):104-113.(in Chinese)
[16]胡长明,董攀,沈勤,等.扣件式钢管高大模板支架整体稳定试验研究[J].施工技术,2009,38(4):70-72.HU C M,DONG P,SHEN Q,et al.Experimental research of global stability of fastener-style steel tubular high-formwork-support[J].Construction Technology,2009,38(4):70-72.(in Chinese)
[2]胡长明.扣件联接钢结构的试验及其理论研究[D].西安:西安建筑科技大学,2008.HU C M.Studies on experiment and theory of steel construction connected with fasteners[D].Xi'an:Xi'an University of Architecture and Technology,2008.(in Chinese)
[3]陈志华,陆征然,王小盾.钢管脚手架直角扣件刚度的数值模拟分析及实验研究[J].土木工程学报,2010,43(9):100-108.CHEN Z H,LU Z R,WANG X D.Numerical analysis and experimental study of the stiffness of right-angle couplers in tubular steel scaffolds[J].China Civil Engineering Journal,2010,43(9):100-108.(in Chinese)
[4]朱启新,万雨辰,张其林,等.钢管脚手架扣件节点的转动刚度试验和计算模型[J].山东建筑大学学报,2010,25(5):499-502,518.ZHU Q X,WAN Y C,ZHANG Q L,et al.Rotational stiffness test and calculation model of steel scaffolds coupler connections[J].Journal of Shandong Jianzhu University,2010,25(5):499-502,518.(in Chinese)
[5]贾莉,刘红波,陈志华,等.扣件式钢管满堂脚手架整体稳定试验与有限元分析[J].建筑结构学报,2017,38(6):114-122.JIA L,LIU H B,CHEN Z H,et al.Experimental research and FEA on bearing capacity of full hall steel tube and coupler scaffold support system[J].Journal of Building Structures,2017,38(6):114-122.(in Chinese)
[6]JIA L,LIU H B,CHEN Z H,et al.Mechanical properties of right-angle couplers in steel tube-coupler scaffolds[J].Journal of Constructional Steel Research,2016,125:43-60.
[7]庄金平,蔡雪峰,吴建亮.周转后直角扣件钢管节点抗滑性能的试验研究[J].福州大学学报(自然科学版),2013,41(3):374-379.ZHUANG J P,CAI X F,WU J L.Turnover experimental research on slip performance of right-angle coupled steel pipe joints[J].Journal of Fuzhou University(Natural Science Edition),2013,41(3):374-379.(in Chinese)
[8]郑莲琼,蔡雪峰,庄金平,等.旋转扣件钢管节点抗滑性能的试验研究[J].河南大学学报(自然科学版),2013,43(6):711-715.ZHENG L Q,CAI X F,ZHUANG J P,et al.Experimental research on anti-slipping performance of steel pipe joints with swivel coupler[J].Journal of Henan University(Natural Science),2013,43(6):711-715.(in Chinese)
[9]蔡雪峰,庄金平,周继忠.直角扣件钢管节点抗扭性能试验研究[J].工程力学,2012,29(2):107-113.CAI X F,ZHUANG J P,ZHOU J Z.Experimental research on torsional performance of right-angle coupled steel pipe joints[J].Engineering Mechanics,2012,29(2):107-113.(in Chinese)
[10]钢结构设计规范:GB 50017-2017[S].北京:中国建筑工业出版社,2017.Standard for Design of Steel Structures:GB 50017-2017[S].Beijing:China Architecture&Building Press,2017.(in Chinese)
[11]Code of practice for falseuorlc:BS 5975-1996.[S].Britain:GB-BSI,1996.
[12]PRABHAKARAN U,BEALE R G,GODLEY M HR.Analysis of scaffolds with connections containing looseness[J].Computers&Structures,2011,89(21/22):1944-1955.
[13]建筑施工扣件式钢管脚手架安全技术规范:JGJ 130-2011[S].北京:中国建筑工业出版社,2011.Technical code for safety of steel tubular scaffold with Couplers in construction:JGJ 130-2011[S].Beijing:China Architecture&Building Press,2011.(in Chinese)
[14]GOHNERT M,LI K N,SON K S.Experimental investigation on the load capacity of a scaffolding fram[J].International Journal of Engineering and Technology,2016,8(6):2460-2467.
[15]陆征然,陈志华,王小盾,等.基于三点转动约束单杆稳定理论的扣件式钢管满堂支撑架承载力研究[J].土木工程学报,2012,45(5):104-113.LU Z R,CHEN Z H,WANG X D,et al.Study of the bearing capacity of fastener steel tube full hall formwork support using the theory of stability of pressed pole with three-point rotation restraint[J].China Civil Engineering Journal,2012,45(5):104-113.(in Chinese)
[16]胡长明,董攀,沈勤,等.扣件式钢管高大模板支架整体稳定试验研究[J].施工技术,2009,38(4):70-72.HU C M,DONG P,SHEN Q,et al.Experimental research of global stability of fastener-style steel tubular high-formwork-support[J].Construction Technology,2009,38(4):70-72.(in Chinese)