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دانلود رایکان مقاله انگلیسی ISI با موضوع آنالیز حساسیت و مقاومت خمشی جانبی – پیچشی تیرهای فولادی

عنوان فارسی مقاله:

آنالیز حساسیت و قابلیت اطمینان مقاومت خمشی جانبی – پیچشی تیرهای فولادی

عنوان انگلیسی مقاله:

Sensitivity and reliability analyses of lateral-torsional buckling resistance of steel beams

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بخشی از مقاله انگلیسی :

4. Modelling of random imperfections

The load carrying capacity of a hot-rolled steel IPE-beam is generally a random variable, which is a function of random geometric and material characteristics. Stochastic analysis of the load carrying capacity can be performed on the computer using Monte Carlo based virtual simulations. The evaluation of MR using the close-form equation (20) is fast and thus suitable for sampling based SA methods, which require repeated evaluation of MR. Theprofile IPE220chosenfor thepresent studyhasbeenused extensively in previous reliability studies [8,10] of structural ultimate limit state. Geometric characteristics depicted in Fig. 1 are random variables obtained from results of experimental research [25], apart from the radius of curvature r, which was not measured. It was assumed that random variable r had mean value equal to the characteristic value of 12 mm. The variation coefficient r was considered the same as the value of the flange as 0.046, i.e. standard deviation is 0.552 mm.