附着式升降脚手架新型钢结构附着节点应用研究

Research on New Steel Structure Attachment Node Applied on Attached Lifting Scaffold

目的研究附着升降脚手架与钢结构建筑连接节点,为合理评价该类节点受力性能和变形规律提供依据.方法对2个新型附着节点进行3种工况下的有限元模拟,分析节点附着在不同位置、不同钢梁尺寸和不同数量下钢结构建筑和节点本身的受力变形特征,绘制应力位移曲线;在有限元基础上进行架体在升降、使用和防坠过程的现场试验,绘制试验过程应力曲线,并将有限元和试验过程的应力曲线进行对比.结果当节点附着在钢梁端部且梁高较大时,节点和建筑结构的应力变形最小;通过有限元与试验的对比,在升降和坠落的瞬间,节点和钢梁应力激增或骤减,而钢柱应力变化较平缓.结论此类节点本身的受力性能良好,但附着位置和钢梁截面属性对节点受力变形性能有显著影响,钢梁的抗扭性能对节点的破坏有决定性影响.

The connection node between the attached lifting scaffold and the steel structure is studied to provide a basis for the reasonable evaluation of the force performance and deformation law of this type of node.Finite element simulation of 2 new attachment nodes under 3 working conditions was performed,the stress and deformation characteristics of steel structures and nodes under different locations,different steel beam sizes and different numbers were analyzed,and stress-displacement curves were drawn.Based on the finite element method,the field test of the frame during the lifting,using and anti-falling process is carried out.The stress curve of the test process is drawn,and the stress curve of the finite element and the test process are compared.When the node is attached to the end of the steel beam and the beam height is large,the stress deformation of the node and the building structure is the smallest.Through the comparison of the finite element and the test,the stress of the node and the steel beam suddenly increases or decreases at the moment of lifting and falling,but he stress variation of the steel column is gentle.The stress performance of this kind of node itself is good,but the attachment position and the steel beam section property have a significant influence on the force deformation performance of the joint,the failure of the joint is seriously affected by the torsional behavior of the steel beam.