Simplified design of composite beams with large web openings to Eurocode 4

Static loading tests were conducted on 16 steelconcrete composite beams and two steel beams to investigate shear resisting mechanisms and the strength of composite beams. The main experimental para...

Experimental Studies on Shear Strength of Steel¿Concrete Composite Beams

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii ACKNOWLEDGEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv SECTION 1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SECTION 2.0 STRENGTH DESIGN PROCEDURES 2.1 Overview of Design Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Interaction Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.3 Forces at the Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.4 Shear Capacity Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.5 Moment Capacity Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.6 Redwood Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 SECTION 3.0 ANALYSIS AND RESUILTS 3.

Steel and Composite Beams With Web Openings

Deep beams are more susceptible to shear failure, and therefore reparation is a crucial for structural reinforcements Shear failure is structural concrete failure in nature It generally occurs without warning; however, it is acceptable for the beam to fail in bending but not in shear The experimental study presented the structural behavior of the deep beams of reinforced concrete (RC) that reinforces the web openings with externally connected carbon fiber reinforced polymer (CFRP) composite in the shear zone The structural behavior includes a failure mode, and cracking pattern, load deflection responses, stress concentration and the reinforcement factor were investigated A total of nine reinforced concrete deep beams with openings strengthened with CFRP and one control beam without an opening have been cast and tested under static four-point bending load till failure The experimental results showed that the increase the size of the opening causes an increase in the shear strength reduction by up to 30% Therefore, the larger the openings, the lower the capability of load carriage, in addition to an increase in the number of CFRP layers that could enhance the load carrying capacity Consequently, utilization of the CFRP layer wrapping technique strengthened the shear behavior of the reinforced concrete deep beams from about 10% to 40% It was concluded that the most effective number of CFRP layers for the deep beam with opening sizes of 150 mm and 200 mm were two layers and three layers, respectively

https://www.mdpi.com/1996-1944/13/12/2804/pdf

Strengthening the Structural Behavior of Web Openings in RC Deep Beam Using CFRP.

Analysis of deflections of composite slabs with profiled sheeting up to the ultimate moment

Procedures for calculating the deflections of composite beams with web openings are described. Initially, a matrix formulation is used. Modeling assumptions are verified by comparison with experimental data, and recommendations for practical application of the matrix analysis procedures are made. The results of the comparison are used to develop a design aid for estimating the maximum deflection of beams with web openings and an expression for calculating the deflection across a web opening. The work demonstrates that, in most cases, a single web opening often has little effect on the total deflection of a composite beam. There are, however, important cases where the effect can be significant. The effects of an opening and of shear deflections are of the same order. Ignoring both the web opening and shear deformation can lead to significant error. The matrix stiffness method, the design aid, and closed form equations provide reasonable estimates of both total deflection and deflection across an opening.

/pdf/deflections-of-composite-beams-with-web-openings-50zo5ulfbw.pdf

Manuel A. Benitez

Papers

Deflections of composite beams with web openings