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DESCUS I
Design and Analysis of Curved I-Girder Bridge System
| The computer program DESCUS I will perform the complete analysis and partial design of a horizontally curved bridge composed of flanged steel sections which act either compositely or noncompositely with a concrete deck. The program can be run using either Working Stress Design (WSD) method, the Load Factor Design (LFD) method or the Load and Resistance Factor Design (LRFD) method. The bridge may be of arbitrary plan configuration and can be continuous and skewed over supports. The girders may have high degree of curvature, may be nonconcentric, bifurcated, and may contain hinges. |
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The program models the bridge structure as a two-dimensional grid in a stiffness format with three degrees-of-freedom at each nodal point (corresponding torsion, shear, and bending moment). All nodal locations, member connectivities, and section properties are generated internally from basic input. All dead load (DL) computations are performed automatically within the program to satisfy the construction conditions specified by AASHTO. Additional constant dead load is allowed input per girder as a special program option. All live load (LL) computations also are performed automatically where the AASHTO truck and lane loadings are applied to an influence surface previously generated for the entire bridge. Impact (I) effects also are included per AASHTO recommendations. Up to nine arbitrary trucks can also be specified and analyzed concurrently.
Output contains the positive and negative maximum moments, shears, and torsion along with the corresponding primary and warping stresses for each girder and beam or truss diaphragm element. These maxima are given along with all AASHTO group combinations for DL + LL + I. Also output are deformations along each girder for DL and maximum LL + I, along with the allowable recommended by AASHTO. Finally, various tables are output which yield information on the design of the sections including maximum stresses, allowable stresses, shear ranges, shear connector, and stiffener spacings.
The program runs under the WINDOWS NT/2000/XP environments. Single user or Network versions are available
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