Deflection of the steel I-sections is an important phenomenon that needs to be taken into account to ensure that the serviceability limit state criteria of the Australian Standards are met. The method that is widely used to calculate the deflection of steel I-sections is by the use of existing formulae that only accommodate the bending stiffness of the beams. A numerical investigation is performed in this study to find the contribution of shear effects in the final deflection of the Welded-Beams (WB) and Welded-Columns (WC). The numerical analyses were carried out in SAP2000 and numerical model was first validated using the experimental results of welded plate girders. The model was then used to analyse simply supported WB and WC sections under uniformly distributed load (UDL) with varying span lengths. The results of the numerical analyses are reported in this study which compare the mid-span deflection values from the simply supported deflection formula with the numerical model deflection values. The data acquired from the numerical analyses were used to establish a span to depth ratio for WB and WC sections below which the shear deflection becomes significant. The analysis of the results obtained from the numerical investigation suggests that a predication error begins to emerge in the result that is acquired from flexure deflection formulae at a certain span-depth ratio.

钢制I型截面的挠度是一个重要的现象，需要考虑到这一点，以确保满足澳大利亚标准的使用寿命极限状态标准。广泛用于计算钢制I型截面挠度的方法是使用现有公式，该公式仅适应梁的弯曲刚度。在这项研究中进行了数值研究，以发现剪切效应在焊接梁（WB）和焊接柱（WC）的最终挠度中的作用。在SAP2000中进行了数值分析，并首先使用焊接板梁的实验结果验证了数值模型。然后，使用该模型分析跨距长度均一的均匀分布载荷（UDL）下简单支撑的WB和WC截面。本研究报告了数值分析的结果，该结果将简单支撑挠度公式的中跨挠度值与数值模型挠度值进行了比较。从数值分析获得的数据用于建立WB和WC截面的跨度与深度之比，在此之下，剪切挠度变得显着。从数值研究获得的结果的分析表明，在一定的跨深比下，从挠曲挠度公式获得的结果中开始出现预测误差。从数值分析获得的数据用于建立WB和WC截面的跨度与深度之比，在此之下，剪切挠度变得显着。从数值研究获得的结果的分析表明，在一定的跨深比下，从挠曲挠度公式获得的结果中开始出现预测误差。从数值分析获得的数据用于建立WB和WC截面的跨度与深度之比，在此之下，剪切挠度变得显着。从数值研究获得的结果的分析表明，在一定的跨深比下，从挠曲挠度公式获得的结果中开始出现预测误差。