Determine section and steel for bending and shear.
Design for bending: M_u=0.87f_yA_st d(1-A_st f_y/(b d f_ck)); check shear with stirrups, deflection by span/depth ratio, cracking and cover. Under-reinforced sections yield first, giving warning. Min and max steel limits. Singly and doubly reinforced, T and L beams.
A 230×450 beam with 3 bars of 20 mm carries about 100 kN·m.
Reinforced concrete beams are designed for bending and shear, so the steel and concrete sections must be sized and detailed carefully.
Determine section and steel for bending and shear.
Reinforced concrete beams are designed for bending and shear, so the steel and concrete sections must be sized and detailed carefully.
From the design moment, using the lever arm and the design yield strength, with the concrete compression block and steel tension force in equilibrium.
Concrete alone cannot carry all shear, so stirrups or links are needed to resist diagonal tension cracks.
Typical applications include designing the bottom steel for a simply supported floor beam, adding links for shear near the supports of a beam and checking that a beam section meets the code limits for moment and shear.
Study "Working stress vs limit state" first (topic 51 of 112 in Civil & Structural). It covers the groundwork this topic builds on.
Neutral axis depth. Balanced section. Anchorage.
A 230×450 beam with 3 bars of 20 mm carries about 100 kN·m.
The next topic is "Design of RC slabs", which builds directly on this one.
It is classed as Intermediate in Civil & Structural (topic 52 of 112). It is an intermediate topic. Work through the beginner topics in Civil & Structural first.
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