مقاله انگلیسی رایگان در مورد بررسی رفتار مکانیکی ستون های فولادی بخش I – اسپرینگر ۲۰۱۸

I-section steel columns have been widely used in steel structures due to their unique advantages of simple production process, uniform texture, light weight, high strength, perfect ductility and toughness, however steel structures are poor in resistance of fire or high temperature. In the past decades, mechanical behaviors of the steel column after fire or in fire have been extensively studied by different researchers. Tondini et al. [1] carried out a series of tests on samples of high-strength steel circular columns at elevated temperatures. Kervalishvili and Talvik [2] studied the stability of axially loaded steel columns with square hollow sections in fire and developed an alternative approach to calculate its buckling. Yang and Yang [3] used experimental methods to investigate the effect of the load ratios, weld details, and the width to thickness ratios on the fire behavior of welded steel box columns. Fan et al. [4] performed the fire test on eight square sections of stainless steel columns mainly to investigate the effects of the section dimension, load ratio, and eccentricity on the fire performance of the stainless steel column. The test results show that eccentricity and load ratio are the key factors for fire performance of the stainless steel col umn. Feng et al. [5] conducted an experimental study on 52 cold-formed thin-walled short steel channel columns at high temperatures to study the physical behavior and failure modes of this type of columns. Cheng et al. [6] presented a numerical investigation on the buckling behavior of channel-section columns. Scullion et al. [7] performed an experimental study on behavior of elliptical section steel columns in fire. Yang et al. [8] conducted a series of H steel columns under fire load. The tests results show that the slenderness ratios of steel columns and width-to-thickness ratio of steel plates are two key factors linked to global buckling of columns and local buckling, respectively. Yang and Hsu [9] conducted a series of experiments to examine the effect of the slenderness ratio of steel columns, the width-to-thickness ratio of flanges, and residual stresses on the ultimate strength of H steel column at elevated temperature. Ragheb [10] developed an inelastic stability model to investigate the local buckling performance of structural steel I-section columns at high temperatures. On the basis of this model, effects of several parameters on the local buckling capacity of steel I-section columns were also investigated. In order to study the effect of stiffness of the surrounding structure on steel I-section columns at elevated temperatures, Correia and Rodrigues [11] conducted a great many fire resistance tests. The results showed that the column’s critical temperature did not reduce with increasing of the stiffness of the surrounding structure. It was also found that the higher initial load levels in fire resulted in shorter critical temperatures of the steel columns. All these researches as above are investigating the mechanical properties of steel column in fire.