Approach to the Unified Evaluation of Ultimate Strength of Steel Framed Structures

通过1987 - 1989年三年的合作研究工作，取得了以下主要成果：(1)研究了SGSR格式作为钢结构构件极限状态设计的设计公式。各构件的标称强度和阻力系数由实验数据或数值计算得到。(2)对实验数据库中的压板基本强度进行了改进，并通过数值分析验证了修正后的压板基本强度曲线。(3)提出了薄壁截面在合力作用下的板强度和局部屈曲强度的统一表达式。(4)提出了加筋板在单轴压缩、弯曲、剪切和合力作用下的极限强度评定方法。(5)通过试验数据与数值模拟的对比，讨论了柱、梁的基本强度曲线，提出了按截面形状和制造工艺分类的3种柱曲线和2种豆曲线。(6)通过数值和实验研究，提出了单轴和双轴弯曲下梁柱相互作用强度公式的合适表达式。(7)建立了框架结构、拱、平面框架、梁格梁的极限强度评定方法。(8)提出了一种新的板梁强度设计方法。这包括对加强筋的最佳位置和刚度的建议。(9)按SGST格式对构件极限状态设计的建议进行了审核。

By the co-operative research works during three years from 1987 to 1989, the following major results are obtained; (1) The SGSR format is examined as the design formula for the limit state design of steel structural members. The nominal strength and resistance factor for each member are obtained by the experimental data or numerical calculations. (2) The basic strength of compression plates from experimental data-base was improved and the revised basic strength curve is verified by the numerical analysis. (3) The unified expressions on the plate strength under combined forces and the local buckling strength of thin-walled sections are suggested. (4) The evaluation methods on the ultimate strength of stiffened plate under uniaxial compression, bending, shearing and combined forces are also proposed. (5) The basic strength curves for columns and beams are discussed by the comparison between the experimental data-base and the numerical simulation, and three column curves and two bean curves classified by cross-sectional shape and manufacturing process are proposed. (6) The appropriate expressions on the interaction strength formula of beam-colons under both uniaxial and biaxial bendings are proposed by the numerical and experimental investigations. (7) The evaluation methods on the ultimate strength of framed structures, arches, plane frames and grillage girders are developed. (8) A new method for the strength design of plate girders is developed. This includes the proposal on the optimum location and rigidity of stiffeners. (9) A proposal to the provisions on the limit state design of structural members is examined in accordance with SGST format.