基于超载法计算大跨度钢纤维混凝土结构的安全系数

Calculation of safety factor of long-span steel fiber reinforced concrete structure based on overload method

纤维混凝土在大跨度结构中的采用愈来愈广泛,因此如何有效地分析大跨度钢筋纤维混凝土结构的受力特点以及采取合理方式计算其安全系数显得尤为关键。本文基于大型有限元软件ANSYS,以某生物医药产业基地不规则连廊结构为背景,建立了大跨度钢纤维混凝土结构和大跨度普通钢筋混凝土结构的非线性有限元模型。采用重力超载法分别计算两种模型在正常使用条件下以及极限使用条件下的安全系数,并将二者的计算结果进行对比分析。结果表明:钢筋钢纤维混凝土结构相较于普通钢筋混凝土结构可以承受更大的应力及变形,且极限使用条件下的安全系数提高了44%左右。该研究成果可以为类似大跨度钢筋纤维混凝土结构的应力、应变研究以及利用重力超载法计算其安全系数提供参考和借鉴。

Fiber concrete is more and more widely used in long-span structures,so how to effectively analyze the mechanical characteristics of long-span reinforced fiber reinforced concrete structures and calculate the safety factor in a reasonable way is particularly critical.Taking the irregular corridor structure of a biomedical industrial base as the background,this paper establishes the nonlinear finite element model of the large-span steel fiber reinforced concrete structure and the long-span ordinary reinforced concrete structure based on the large-scale finite element software ANSYS.The gravity overload method was used to calculate the safety factors of the two models under normal and extreme conditions,and the calculation results of the two models were compared and analyzed.The results show that the reinforced steel fiber reinforced concrete structure can withstand greater stress and deformation than the ordinary reinforced concrete structure,and the safety factor under the ultimate service condition is increased by about 44%.The research results can provide reference for the stress and strain research of similar large-span reinforced fiber reinforced concrete structures and the calculation of the safety factor using the gravity overload method.