Title Day 57 - RCD 1 Annotated.pdf ✅

Working Stress Design Modulus of Rupture In structural design, concrete is assumed to have no tensile resistance. Research has shown that the concrete tensile strength has a significantly negligible tensile strength defined as the modulus of rupture. For NSCP 2015 419.2.3, the modulus of rupture is defined as fr = 0. 62λ fc ′ Where fc ′ is the 28-day compressive strength of concrete. The value of λ is based on the composition of aggregate in the concrete mixture. Based on NSCP 2015 419.2.4.2, the usual values are: For working stress design, to determine whether of not concrete is to be analyzed as cracked or uncracked, the first step is to compute the UNCRACKED moment of inertia, then solve for fr . Set fc ’ as the stress in tension concrete. DAY 57: REINFORCED CONCRETE DESIGN 1 Like steel reinforcement in concrete, your hard work strengthens your success! A logo with a white letter Description automatically generated
Working Stress Design: SRB Moment of Inertia Recalling composite members, steel and concrete have different properties, especially elastic properties. To analyze a beam with different materials, the modular ratio is used. For steel, the usual modulus of elasticity is Es=200 GPa. For concrete, refer to NSCP 419.2.2.1 Here, wc is the density of concrete. Modular Ratio From the NSCP 2001 code (updated provision was omitted in latter codes), the modular ratio used is n = Es Ec Where n should be rounded off to the nearest integer. DAY 57: REINFORCED CONCRETE DESIGN 1 Like steel reinforcement in concrete, your hard work strengthens your success! A logo with a white letter Description automatically generated