本文根据Vlasov的薄壁杆件翘曲理论,采用有限元和解析相结合的分析方法,研究了四周与楼板连接的开口薄壁核芯筒的扭转刚度,考察了楼板出平面刚度对核芯筒受力性能的影响,提出楼板有效宽度的概念,推导出相应的计算公式。在实际工程设计计算中,可考虑楼板对核芯筒约束扭转的制约作用。 Based on Vlasov’s theory of thin-walled rod warping, a finite element analysis method combined with analytic analysis was used to study the torsional stiffness of the open-ended thin-walled core barrel connected to the floor, and the plane stiffness of the floor was examined for the core barrel. With the influence of the mechanical properties, the concept of the effective width of the slab was proposed and the corresponding calculation formula was deduced. In practical engineering design calculations, the constraining effect of the floor on the restraint and torsion of the core barrel can be considered.