نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
Background: The stability of the panel zone plays a critical role in the performance of steel moment-resisting beam‑to‑column connections. Continuity plates are commonly used to prevent local instability in the column web and flanges; however, existing design provisions are primarily based on studies of wide‑flange sections, and limited information is available regarding the behavior of double‑IPE built‑up columns under concentrated compression. This study investigates the local load‑bearing capacity and instability mechanisms of double‑IPE built‑up column webs subjected to double compression loading.
Methods: A finite element model was developed to simulate local instability under concentrated load, and its accuracy was validated using available experimental data. The static Riks analysis method was employed to examine buckling behavior, incorporating initial imperfections equal to 0.001% of the first buckling mode shape. Subsequently, the behavior of 15 double‑IPE built‑up column specimens under double compression loading conditions was examined.
Results: The web and continuity plate capacities were evaluated using the AISC 360-22 provisions. The findings indicate that the actual web compression buckling capacity ranges from 132% to 189% of the theoretical predictions for columns without continuity plates, while the effective load‑bearing capacity of continuity plates ranges from 91% to 147% of the theoretical values. Finally, recommendations were developed for determining the capacities of the web and continuity plates in built-up IPE columns.
Conclusion: Current design code criteria are overly conservative in predicting the local capacity of double sections. The proposed coefficients and relations proposed in this study enable a more accurate estimation of the actual capacity of columns.
کلیدواژهها English
