![]() ![]() The aim of the concrete coating is to provide adequate weight to overcome buoyancy. Mohamed Abdallah El-Reedy Ph.D., in Offshore Structures (Second Edition), 2020 9.5 Concrete coating However, due to the better performance of the concrete in compression than the tension, the concrete compressive strength is more influential on the pure ultimate axial load than the pure bending moment. Besides, pure ultimate axial load, ultimate bending moment, and ultimate pure bending moment are enhanced by increasing the concrete strength. The interaction curve is enlarged by increasing the concrete strength. It can be seen that the concrete compressive strength has significant impacts on the interaction curves of beam-columns. Fig. 2.68 shows the schematic view of beam-column interaction curves with different concrete compressive strengths ( ( f c ′ ) 1 < ( f c ′ ) 2 < ( f c ′ ) 3 < ( f c ′ ) 4 ) while other parameters are constant. The effect of the concrete strength is the most when the slenderness ratio is L r < 10, whereas its influence reduces with increasing L r.Ĭoncerning the axial load–moment interaction diagrams of CFST/CFDST beam-columns, increasing the concrete compressive strength reduces the distance between Points C and D in Fig. 2.66 and hence, shifts the position of balanced point inwards and downwards. The incremental influence of the concrete strength on the ultimate axial strength of beam-columns depends on the slenderness ratio of the member L r. By contrast, the ductility of beam-columns declines with increasing the concrete compressive strength due to the brittle behavior of the HSC. Consequently, the use of HSC in very slender CFST/CFDST columns is not efficient. However, its effect reduces with increasing the slenderness of the member. ![]() The compressive strength of the concrete has the most pronounced effect on the ultimate axial load than the bending capacity. Similarly, the ultimate axial strength enhances as the concrete strength increases. Under the same circumstances, the flexural stiffness of the beam-column improves with increasing the concrete strength. The concrete compressive strength affects the fundamental behavior of beam-columns. Bo Yang, in Single Skin and Double Skin Concrete Filled Tubular Structures, 2022 2.11.3 Effects of the concrete compressive strength ![]()
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