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满堂脚手架在桥梁施工中已被广泛应用,但由于对此结构体系各构造因素及荷载作用形式与承载性能之间的关系尚缺乏详细了解,导致近些年桥梁满堂脚手架倒塌事故频发.现有各种满堂脚手架承载力计算方法中,没有考虑满堂脚手架中上部荷载通过顶层水平杆“偏心传递”给立杆、扣件的“偏心连接”而导致的立杆与横杆不在同一平面内的影响以及架体顶部在受到偏心施加的局部堆积荷载不利情况下承载能力的降低(以上3种偏心作用可以统称为偏心荷载).针对上述情况,在分析桥梁满堂脚手架结构体系特点的基础上,进行了5组原型试验,提出了考虑偏心荷载作用下的桥梁满堂脚手架数值计算模型,并对其进行了参数化分析,找出了偏心荷载对不同搭设参数桥梁满堂脚手架承载性能的影响规律.结果表明,偏心荷载将对满堂脚手架的承载性能产生不利影响,较大的偏心局部堆积荷载容易造成桥梁满堂脚手架局部杆件失稳,进而引起架体整体倒塌.
Full-scale scaffolding has been widely used in the construction of bridges, but due to the lack of detailed understanding of the structural factors and the relationship between load forms and bearing properties, the collapse of full-scale scaffolding in bridges has been frequent in recent years. Various full-scale scaffolding bearing capacity calculation method, did not account for the full house scaffolding in the upper load through the top horizontal rod “eccentric transmission ” to the pole, the fastener “eccentric connection ” caused by the pole and the bar is not the same The influence of the plane and the decrease of bearing capacity of the top of the frame under the adverse local stacking load imposed by the eccentricity (the above three kinds of eccentricity can be collectively referred to as eccentric loads) .According to the above analysis, based on the analysis of the characteristics of the full-scale scaffolding structure of the bridge , Five sets of prototype tests were carried out and the full-scale scaffolding numerical calculation model considering the eccentric load was proposed. Parametric analysis was carried out to find out the influence of eccentric load on the load-carrying capacity of full-span scaffolding bridge with different parameters The results show that the eccentric load will have an adverse effect on the carrying capacity of full scaffolding, and the larger eccentricity Partial stacking load easily lead to partial failure of the full span of the bridge scaffolding, which in turn led to the overall collapse of the frame body.