Abstract
The article analyses the impact of the live load position on the surface of a reinforced concrete flat slab floor of 32.0 m × 28.8 m. Four variants of a live load position are investigated: located on the entire concrete slab, set in a chessboard pattern, applied by bands and imposed separately in each of the slab panels. Conclusions are drawn upon differences in bending moments, the time of calculation and the size of output files. The problems in the interpretation of results are presented too. A procedure is presented to model the reinforced concrete structures in computational programs. The recommendations of the Eurocodes are presented regarding to load combinations in the Ultimate Limit State (ULS). Convergence analysis of the finite element mesh is carried out to verify the obtained results. The law status on the implementation of the Building Information Modelling (BIM) technology in Poland points out significant time savings in the application of this technology.
Highlights
Structural design is generally based on virtual mapping of a real object
For the sake of comparative analysis four variants were considered to locate the load on a slab-column structure: 1) variant 1 - live load located on an entire surface of the slab; 2) variant 2 - live load set in a chessboard pattern load; 3) variant 3 - live load set by bands; 4) variant 4 - live load applied separately in each panel of slab
The imposed live load applied in the chessboard pattern gives similar results for Mxx (0.65%), it underestimates the bending moment Myy as well as the load applied by bands (3.30%) in the variant 3
Summary
Structural design is generally based on virtual mapping of a real object. The designer is supported by a number of computational tools to complete the task. In the design process the task of a structural designer is to determine the static model and the load layout, to verify the results These tasks include: definition of the structure (dimensions, types of finite elements, material data, support types), determining of finite element mesh (FE), load application, load combination statement, verification of the FE mesh and the final internal forces. These steps are necessary for the designer of reinforced concrete structures to determine the required reinforcement due to an entirety of Ultimate Limit States (ULS) and Serviceability Limit States (SLS). The factors affecting the design efficiency are the calculation time, simplicity in the interpretation, accuracy of the solution
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