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提出了一个有关组合梁结构性能的全面数值分析,针对剪切变形效应、不同施工方法、不同程度的钢构件截面应变硬化等情况下,对简支组合梁结构性能进行了一系列的数值分析。使用先进的三维有限元方法,模拟输入特定的材质、几何尺寸、非线性的界面,分析和讨论了24组简支组合梁的承载能力和变形特性。通过分析和考虑两种不同的施工方法,包括混凝土浇筑组合梁时仅采用端部支撑及混凝土浇筑组合梁时采用全支撑,发现剪切连接件滑移的要求在前者的情况下相对较小。另外,若同时考虑欧洲规范第3及第4部分中提及的钢构件截面应变硬化效应后,在全剪切连接情况下,组合梁承载能力有8.5%的显著提升。然而,随着剪切连接程度的减少,截面应变硬化作用减弱,同时,对剪切连接件滑移的要求也会随之减少,因此这样的变化对于组合梁里允许应变而非延性的剪切来说是非常重要的。
A comprehensive numerical analysis on the structural performance of composite beams is presented. A series of numerical analyzes are performed on the structural performance of simply supported composite beams under the conditions of shear deformation effect, different construction methods, and different degrees of strain hardening of the steel members. Using the advanced three-dimensional finite element method, the input materials, geometrical dimensions and non-linear interfaces were simulated. The bearing capacity and deformation characteristics of 24 simply supported composite beams were analyzed and discussed. By analyzing and considering two different construction methods, including full support of end beams and concrete beams when concrete beams are used in concrete beams, it is found that the requirements of shear connections are relatively small in the former case. In addition, the load-carrying capacity of composite beams is significantly increased by 8.5% under full-shear connection, taking into account the strain-hardening effect of the cross-section of steel members referred to in Parts 3 and 4 of the European Code. However, as the degree of shear connection decreases, the strain hardening effect of the cross-section weakens and the requirement for slippage of the shear connector decreases. Therefore, such a change is of great importance to allow the shear rather than the ductile shear in the composite beam It is very important.