Because composite beams are not calculate their elastic stre

Because composite beams are not calculate their elastic stresses. 1. , we need transformed sections to 2. What is the state of a composite section when the corresponding stress distribution is called a plastic stress distribution? a. For positive bending moment, the entire steel cross section yields and the concrete breaks in tension. For negative bending moment, the entire steel cross section yields and the concrete crushes in compression. For negative bending moment, the concrete yields and the entire steel cross section crushes in compression. For positive bending moment, the entire steel cross section yields and the concrete crushes in compression. b. c. d. 3. Shored construction is more efficient than unshored construction because in unshored construction, the steel shape alone must have sufficient strength to resist all loads applied before concrete cures. un shered mere commcn a. True False Because of the large moment of inertia of the transformed section, deflections in composite beams are larger than in noncomposite beams. 4. a. Trueb False A W14x22 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-80 psf. A992 steel is used, and f\'c=4 ksi a. How many inch ½-inch stud anchors are required for full composite behavior in 5. Determine available flexural strength of the beam Before the concrete cures: After the concrete cures:_ b. Determine ultimate bending moment of the beam under service loads (after construction), Mu. us and Mue Is the composite beam adequate for flexural moment under final loads? c. d.

Solution

1. Because composite beams are not HOMOGENEOUS, we need to transform the sections.