mathematical model for estimation of self weight of flexural steel members
نویسندگان
چکیده
the first step in the design of plate girder is to estimate the self-weight of it. although empirical formulae for the same are available, the level of their accuracy (underestimate or overestimate) with respect to actual self-weight is not known. in this paper, optimized sections are obtained for different spans subjected to different live load carrying capacities and self-weights are estimated. excel solver, which adopts reduced gradient method (rgm) was applied for optimization. the objective function was chosen as cross-sectional area with twelve constraints based on lrfd (is 800: 2007) design specification for safety and serviceability. simply supported (laterally restrained) plastic symmetric cross section without stiffeners is adopted for study. a mathematical model was developed based on best-fit curves between self-weight, span and live load carrying capacity and their trend line equations are obtained. the study revealed that, the ratio of self-weight to load carrying capacity was parabolic for a given span. the results from this equation are compared with the conventional formula and the standard deviation of the proposed model with respect to actual self-weight is in the range of -0.03 to 2.29 while that from the conventional model is in the range of -0.04 to 9.18.
منابع مشابه
MATHEMATICAL MODEL FOR ESTIMATION OF SELF WEIGHT OF FLEXURAL STEEL MEMBERS
The first step in the design of plate girder is to estimate the self-weight of it. Although empirical formulae for the same are available, the level of their accuracy (underestimate or overestimate) with respect to actual self-weight is not known. In this paper, optimized sections are obtained for different spans subjected to different live load carrying capacities and self-weights are estimate...
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عنوان ژورنال:
international journal of optimaization in civil engineeringجلد ۷، شماره ۲، صفحات ۲۴۱-۲۵۵
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