Genetic Programming Based Modeling of Shear Capacity of Composite Beams With Profiled Steel Sheeting

Abstract

This study investigates the availability of Genetic Programming (GP) for modeling the ultimate shear capacity of composite beams with profiled steel sheeting for the first time in literature. Experimental data involving push-out test specimens of 46 composite beams from an existing database in the literature were used to develop GP model. The input parameters affecting the shear capacity were selected as stud position (strong and weak), sheeting type (width of rib of the profiled steel sheeting, depth of the rib), stud dimensions (height and diameter), slab dimensions (width, depth and height), reinforcement in the slab and concrete compression strength. Moreover, a short review of well-known building codes regarding ultimate shear capacity of composite beams is presented. The accuracy of the codes in predicting the ultimate shear capacity of composite beams was also compared with the proposed GP model with comparable way by using same test data. The study concludes that the proposed GP model predicts the ultimate shear capacity of composite beams by far more accurate than building codes.Keywords: Shear connection, composite beams, push-out tests, genetic programming INTRODUCTIONThe composite behavior of two or more structural members joined together by using different materials is called "a composite structure". Each material of a composite structure usually has a superior property effectively used for providing the composite behavior of the materials. Although several materials are used as the shear connector of a composite structure, "headed stud" shear connectors are generally used in constructions due to their practicality.In the composite beams with profiled steel sheeting many factors such as; dimensions and direction of profiled steel sheeting, compressive strength of concrete, reinforcement area and position and also strength, dimension and location of shear connectors affect the behavior of shear connectors. Push out tests is commonly used to determine the capacity of the shear connectors and load-slip behavior of shear connectors. According to Eurocode 4 [1], the push-out specimens consist of a steel beam section held in the vertical position by two identical concrete slabs. The concrete slabs are attached to the beam by shear connectors. The connection is subjected to a vertical load, which produces a shear load along the interface between the concrete slab and the beam flange on both sides. At a specified load or displacement the slip between the slabs and the beam flange is evaluated. The failure load divided by the numbers of the connectors is assumed as the shear connection capacity [2].Composite construction using steel and concrete has been used since the early 1920s. It gained widespread use in bridges in the 1950s and in buildings in the 1960s [3]. Both push-out tests, which were first used in Switzerland in the 1930s [4], and full-scale beam tests have been used to develop shear stud strength prediction expressions. Push-out tests are usually used to evaluate a wide array of parame...

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