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An upper bound method of triaxial fluxional function velocity field is used to analyse thick slab rolling in this paper. Some main factors affected to broadening ratio and rolling pressure are considered in this analysis. The factors include the deformation habit of broabening and side bulge, slab broadness-thickness ratio roller radius, frictional factror and compression rate. The results is basically consistant with experiment. It provides a theory basis and calculation method for making reasonable... An upper bound method of triaxial fluxional function velocity field is used to analyse thick slab rolling in this paper. Some main factors affected to broadening ratio and rolling pressure are considered in this analysis. The factors include the deformation habit of broabening and side bulge, slab broadness-thickness ratio roller radius, frictional factror and compression rate. The results is basically consistant with experiment. It provides a theory basis and calculation method for making reasonable rolling-technology and broadening estimation 采用三维流函数速度场按上界法解析了厚件平辊轧制问题。解析中考虑了宽展和侧鼓形的变形特点,以及坯料的宽厚比、辊径、摩擦因子、压下率等主要因素对宽展率和相对单位力的影响。解析结果与实验结果基本相符合。为制订合理的轧制工艺,以及对宽展的估计提供了理论依据和计算方法。 In this paper,a finite strip method is suggested for the analyses of reinforced concreteslabs and shells with varying thicknesses and arbitrary steel reinforcements. For the analy-ses,a quadratic three-dimensional degenerated thick slab strip or shell strip with discretizedlayers through the thickness is established and the Simpson′s integration technique along thestrip span is used,with which arbitrary steel reinforcement may be treated easily. To facili-tate the computation,an efficient formula choosing... In this paper,a finite strip method is suggested for the analyses of reinforced concreteslabs and shells with varying thicknesses and arbitrary steel reinforcements. For the analy-ses,a quadratic three-dimensional degenerated thick slab strip or shell strip with discretizedlayers through the thickness is established and the Simpson′s integration technique along thestrip span is used,with which arbitrary steel reinforcement may be treated easily. To facili-tate the computation,an efficient formula choosing the number of points in the Simpson′s in-tegration is proposed.To improve the efficiency of the finite strip method for materially non-linear analysis,authors suggest a“quasi-stiffness-matrix method”which gives higher preci-sion and quicker convergency than the traditional FSM. Two numerical examples are given to manifest the effectiveness and precision of themethod of this paper. 本文发展了变厚度任意配筋的钢筋混凝土板壳问题中考虑材料非线性分析的有限条法。文中建立了沿厚度方向作分层离散的三维蜕化二次厚壳条,而在计算上,沿壳条跨度方向采用Simpson积分技术可以方便地处理该方向的任意配筋并给出了满足精度要求的选取Simpson积分点数的表达式。文中提出的“拟刚度矩阵”法大大简化了非线性有限条法的求解过程。给出两个数值算例表明了理论方法的有效性及其精度。 The thick raft foundation rested on densely distributed piles for tall building structures in Wuhan region have been studied in this paper. A calculation method of thick slab theory is proposed and a numerical example is shown to provide reference in designing. 本文结合武汉地区在超高层建筑中采用的密桩—厚筏基础进行分析研究后,提出一个厚板理论的计算方法,以供设计参考.
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