Abstract: Reliability-Based Interaction Curves Forreinforced Concrete Design of Short Columns to Eurocode 2 Pages 1-7 Author Abubakar IdrisMustapha A. Falmat The work presented in this paper examined the criteria of Eurocode 2 (EC 2) (2004) for the design of reinforced concrete short columns subjected to axial loads and bending moments using First Order Reliability method (FORM).Individual design variables of the columns were considered random with known probability distributions. Computations of design safety indices were carried as described by Low and Tang (2007). Interaction curves were plotted considering varying safety indices of the columns. The choice of a target reliability index was made to correspond with values recommended by Joint Committee on Structural Safety (JCSS, 2001). A design example was included to demonstrate the applicability of the developed reliability-based interaction as against the current EC 2 design charts. It was shown that considering the same loading and geometrical conditions of the column, the reliability-based procedure gave higher steel reinforcements at target safety indices of 2.5, 3.0, 4.0 and 5.0; and are safer than the deterministic design. PubDate: 2015-8
Abstract: A Parametric Template Format for Solid Models of Reinforced Concrete Structures Pages 8-16 Author Guillermo A. RiverosKerry T. Slatter The trend in the architecture/engineering/construction industry toward the use of three-dimensional representations of structures in design, analysis, and construction has led to the acceptance of the CIS/2 format for steel structures. This allows all information defining the structural steel to be passed among the structural designer, detailer, fabricator, and erector through a digital data file that eliminates the need for re-entering information. The three-dimensional model also facilitates the task of checking for interferences and inconsistencies. A format is proposed for describing the geometry of typical reinforced concrete structures as a function of user-defined parameters. The structure is constructed from components aligned with a flexible grid; corners are analogous to finite element nodes, while beams and slabs would be one- and two-dimensional elements, respectively, in conventional structural models. The dimensions of the components are defined as functions of parameters listed in the template. A simple application of this approach would be a template to model a multiple-story concrete frame structure, and the basic template can be enhanced to give the designer more flexibility throughout the structure by adding parameters. Two applications of the template format are developed: a simple reinforced concrete frame and a more complex reinforced concrete pumping station. The graphical user interface allows the designer to change any dimensional parameter to immediately update the structure geometry in order to meet the project requirements. The final solid model is then converted to a finite element model and analyzed to determine shear, moment, and axial force in beams, columns, and slabs, which can then be used to design the reinforced concrete members. A sampling of the results of the analyses is presented. PubDate: 2015-8
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