MATHEMATICAL MODEL FOR ESTIMATION OF SELF WEIGHT OF FLEXURAL STEEL MEMBERS
عنوان مقاله: MATHEMATICAL MODEL FOR ESTIMATION OF SELF WEIGHT OF FLEXURAL STEEL MEMBERS
شناسه ملی مقاله: JR_IJOCE-7-2_006
منتشر شده در در سال 1395
شناسه ملی مقاله: JR_IJOCE-7-2_006
منتشر شده در در سال 1395
مشخصات نویسندگان مقاله:
P. Markandeya Raju
G. V. Rama Rao
G. Himala Kumari
E. Gowthami
خلاصه مقاله:
P. Markandeya Raju
G. V. Rama Rao
G. Himala Kumari
E. Gowthami
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 ۸۰۰: ۲۰۰۷) 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 -۰.۰۳ to ۲.۲۹ while that from the conventional model is in the range of -۰.۰۴ to ۹.۱۸.
کلمات کلیدی: symmetrical, plate girder, optimization, simply supported, excel solver, self-weight, load carrying capacity, constraints, plastic section, laterally restrained.
صفحه اختصاصی مقاله و دریافت فایل کامل: https://civilica.com/doc/1831349/