提篮式型钢悬挑脚手架受力机理分析

Stress mechanism analysis of basket type steel cantilever scaffold

采用现场原位试验方法对提篮式型钢悬挑脚手架进行加载试验,用试验结果验证有限元方法的有效性。针对影响其受力性能的主要变量,采用单因子变量法,进行多变量有限元分析,以明确各变量对脚手架受力性能的影响。结果表明,有限元计算方法用于提篮式型钢悬挑脚手架的受力是可行的,在2拉杆同时存在的情况下,外拉杆发挥作用远大于内拉杆。主梁工字钢规格尺寸的加大会削弱拉杆的作用;而拉杆直径的加大会增强对主梁的约束作用。实际设计工作对主梁挠度控制要求严格时,建议可以考虑适当加大主梁工字钢规格或加大外拉杆直径;实际施工使用,需定期对拉杆进行检查,尤其是对外拉杆进行检查,保证其发挥作用。

The loading test of basket type steel cantilever scaffold is carried out by using the field in-situ test method,and the effectiveness of the finite element method is verified by the test results.Then,according to the main variables that affect the mechanical performance of the scaffold,the single factor variable method is used to carry out the multivariable finite element analysis to clarify the influence of each variable on the mechanical performance of the scaffold.The results show that it is feasible to apply the finite element method to the stress of the basket type steel cantilever scaffold.When two tie rods exist at the same time,the effect of outer tie rod is much greater than that of inner tie rod.The increase of I-beam size will weaken the role of tie rod,while the increase of tie rod diameter will enhance the restraint effect on the main beam.It is suggested that when the deflection of the main girder is strictly controlled in the actual design work,it is suggested that the I-steel specification of the main girder or the diameter of the outer tie rod should be appropriately increased.In the actual construction,it is necessary to check the pull rod regularly,especially the external pull rod to ensure its function.