Abstract
The measured-to-estimated shear force ratio (Overstrength ratio) is an important metric for the capacity design of a shear link’s adjacent elements and connections. However, some investigations found that short links had an abnormally high overstrength ratio if the shear strength of short links is estimated by the provisions of the American Institute of Steel Construction (AISC 341-16). This study assesses the AISC 341-16 equation’s precision in estimating the shear strength of short links and suggests a Simple Truss Model (STM) for this purpose. The proposed STM considers the strain hardening of flanges and the web due to cyclic loading, where the STM was derived from the end links to reach the plastic moment strength (Mp). An experimental database of 109 specimens from the literature was gathered, screened, and preprocessed to assess the performance of these models. This research found that the overstrength ratio for built-up and rolled W-shape short links is underestimated by the AISC 341-16 provisions; only 4% and 13% of built-up and rolled W-shape specimens, respectively, meet the suggested AISC overstrength value of 1.25. The proposed STM model beat the AISC equation in predicting the overstrength values, with mean values of 1.21 and 1.15 for the built-up and rolled W-shape specimens, respectively. Additionally, for the built-up and W-shape specimens, respectively, 58% and 73% of the overstrength determined by STM conform with the recommended AISC overstrength value of 1.25. Since the STM considers the link length and cross-sectional area, contrary to what the AISC predicted, the calculated overstrength values are less susceptible to the link length ratio, flange width-to-thickness ratio, and the ratio of the flange-to-web areas. This study recommends switching from the current AISC equation to the STM because the STM predictions have statistical metrics that are noticeably better than the AISC equation, with Root Mean Square Error (RMSE) and Mean Absolute Percentage Error (MAPE) of 0.27 and 18.6%, 0.22 and 14.6%, and built-up and rolled W-shape links, respectively.
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