This paper briefly describes commonly used methods of determination of shear strength of reinforced concrete beams. Classical method, Eurocode 2 approach and most complex approach proposed by P. D. Zararis in a series of papers are depicted and compared. Experimental tests of RC beams shown in the subsequent paper (Part II) are confronted with the model predictions.
The designers of civil engineering structures often have to face the problem of the reliability of complex computational analyses performed most often with the Finite Element Method (FEM). Any assessment of reliability of such analyses is difficult and can only be approximate. The present paper puts forward a new method of verification and validation of the structural analyses upon an illustrative example of a dome strengthened by circumferential ribs along the upper and lower edges. Four computational systems were used, namely Abaqus, Autodesk Robot, Dlubal RFEM, and FEAS. Different models were also analyzed—two-dimensional (2D) and three-dimensional (3D) ones using continuum, bar, and shell finite elements. The results of the static (with two kinds of load—self-weight and load distributed along the upper ring) and modal analyses are presented. A detailed comparison between the systems’ and models’ predictions was made. In general, the spatial models predicted a less stiff behavior of the analyzed dome than the planar models. The good agreement between different models and systems was obtained for the first natural frequency with axisymmetric eigenmodes (except from the Autodesk Robot system). The presented approach to the verification of complex shell–bar models can be effectively applied by structural designers.
This paper describes differences between models of a rectangular shaped reinforced concrete floor with ribs, commonly used by structural designers. Comparison analysis proves significant differences in result obtained from different models. Incompatibility is shown both in static as well as in modal analysis.
Impact of bar incompressibility assumption on frames has been analysed in this paper. It has been shown, that in some cases of high buildings, where rigid core is surrounded by set of bars, assumption of columns incompressibility is justified. With compressible bars, significant bending moments occurs on beams connected to core of the building.
FEM models of axi-symmetrical reinforced concrete dome with two rings have been analysed. Different complexity level of computational models (2D and 3D), geometry simplifications and FEM codes (Abaqus, FEAS, ARSAP) have been compared. Assessment of building structure deflections has been performed with several approaches, which gave opportunity to confront them and estimate mistakes of most commonly used models.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.