各工程作业考虑下简支组合梁结构性能的数值分析(英文)

Numerical Investigation into the Structural Behaviour of Simply Supported Composite Beams with Various Practical Considerations

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。

This paper presents a comprehensive numerical investigation into the practical structural behaviour of simply supported composite beams,and the effects of deformable shear studs,different construction methods and different levels of strain hardening in steel sections are examined in details.Based on advanced three dimensional finite element models with material,geometrical and interfacial non linearity,both the load carrying capacities and the deformation characteristics of a total of 24 simply supported composite beams are presented and discussed.By considering two different construction methods,it is shown that the structural demand on the shear connectors in those beams which are end supported during concrete casting is considerably smaller than that in those beams which arc fully supported during concrete casting.Moreover,by incorporating strain hardening in the steel sections as recommended in Eurocodes 3 and 4,it is found that the load carrying capacities of those composite beams with full degree of shear connection may be increased by 8.5％ significantly.However,the effect of strain hardening tends to be less pronounced when the degree of shear connection is reduced.Meanwhile,the structural demand on the shear studs is found to be decreased accordingly,and this is very important for composite beams with deformable but non ductile shear connectors.