TITLE: DESIGN OF SINGLY REINFORCED RECTANGULAR BEAMS USING STRENGTH DESIGN METHOD. PROBLEM: Design a rectangular concrete beam section for positive moment and negative moment for the loads (unfactored) and p values given. Show sketch of cross section, including bar size, arrangement and spacing. Use concrete weight = 236 kN/m³, fy = 414 MPa, f`c = 27.6 MPa, p = 0.5Pmax concrete cover = 40 mm, tie bar = 10 mm Ø.Deadload : w₁₁ = 90 kN/m Live Load: WLL = 40 kN/m and PLL = 3kN. Assume beam weight equal to 8 kN/m. PLL W = WDL + WLL +Selfweight of beam 3.5m 7 m 3.5m Use p =Pmax (SUPPORT ONLY) COMPUTATION: Required: 1. Factored Load 2. Required moment Mu, using NSCP 2015 load combination. a. at the left support b. at the mid-span c. at the right support 3. Design a singly reinforced rectangular beam: a. at the left support b. at the mid-span c. at the right support Use b=0.54d and 32-mm diameter bar. 4. Check adequacy: a. at the left support b. at the mid-span c. at the right support SKETCH

What is the main value in pre-stressing pre-cast concrete columns?

A W1422 acts compositely with a 4-inch-thick floor slab whose effective width b is 90 inches. The beams are spaced at 7 feet 6 inches, and the span length is 30 feet. The superimposed loads are as follows: construction load = 20 psf, partition load = 10 psf, weight of ceiling and light fixtures = 5 psf, and live load = 60 psf, A992 steel is used, and fc=4 ksi. Determine whether the flexural strength is adequate. a. Use LRFD. b. Use ASD.

Note For Problems 9.6-1 through 9.6-5, use the lower-bound moment of inertia for deflection of the composite section. Compute this as illustrated in Example 9.7. 9.6-1 Compute the following deflections for the beam in Problem 9.2-1. a. Maximum deflection before the concrete has cured. b. Maximum total deflection after composite behavior has been attained.