BFRPC盖梁模壳结构参数数值分析

Numerical Analysis of Structural Parameters of BFRPC Capping Beam Formwork Shell

为了探讨玄武岩纤维活性粉末混凝土(BFRPC)盖梁模壳结构的可行性,采用Abaqus软件建立有限元模型,分析了模壳厚度、纵筋配筋率和U形箍筋配筋率等参数对模壳后浇混凝土阶段受力特点的影响。结果表明:1)后浇混凝土阶段,20 cm厚的BFRPC模壳承载能力极限状态下的最大主应力和正常使用极限状态下的最大位移均满足规范要求,证明了半预制盖梁施工方式的可行性;2)在其他条件不变的前提下,模壳厚度对结构施工阶段受力的影响最大,纵筋配筋率和U形箍筋间距对其影响较小;3)根据所得应力与位移随结构参数的变化曲线,推断出各参数的合理区间,为实际工程应用提供基础。

In order to explore the feasibility of the formwork shell structure of basalt fiber reinforced reactive powder concrete(BFRPC)capping beam,the finite element model was established by Abaqus software.The effects of the thickness of the formwork shell,the longitudinal reinforcement ratio and the U-shaped stirrup reinforcement ratio on the mechanical characteristics of the post-cast concrete stage of the formwork shell were analyzed.The results show that:1)In the post-pouring concrete stage,the maximum principal stress of the 20 cm thick BFRPC formwork shell under the ultimate state of bearing capacity and the maximum displacement under the normal use limit state meet the requirements of the specification,which proves the feasibility of the construction method of the semi-prefabricated bent cap;2)Under the premise of other conditions unchanged,the thickness of the formwork shell has the greatest influence on the stress of the structure in the construction stage,and the longitudinal reinforcement ratio and the U-shaped stirrup spacing have little influence on it;3)According to the curve of stress and displacement with the change of structural parameters,the reasonable interval of each parameter is inferred,which provides the basis for practical engineering application.