E.34. The formwork for a 6-in.-thick reinforced concrete floor slab of normal weight consists of4 in. Class II plyform sheathing supported by 2 x 6 in. joists spaced 2 ft. (o.c), which inturn are supported by 2 x 8 in. stringers spaced 4 ft. (0.c). The stringers are themselvessupported by shores spaced 4 ft. on centers.The joists and stringers are constructed with Douglas fir, coastal construction, and are tobe used many times. The allowable flexural stress in the fir members is 1875 psi, theallowable horizontal shear stress is 180 psi, and the modulus of elasticity is 1,760,000 psi.For the plyform the corresponding values are 1330 psi, 72 psi, and 1,430,000 psi, with thestress applied parallel with the face grain. Using a live load of 150 psf, a) Check thebending and shear stresses in the sheathing, joists and stringers; b) Check deflectionsassuming that the maximum permissible deflection of each of these elements is L/360 forall loads.11.2. Redesign the formwork system for Class Exercise E34 and select a new adequate plyformand stringer for this formwork.

Answered: Image /qna-images/answer/f2d235c9-5b59-4de0-b1a0-beea6b6985f1.jpg

E.34. The formwork for a 6-in.-thick reim ¾ in. Class II plyform sheathing su turn are supported by 2 x 8 in. str supported by shores spaced 4 ft. on The joists and stringers are constru be used many times. The allowab allowable horizontal shear stress is

E.34. The formwork for a 6-in.-thick reim ¾ in. Class II plyform sheathing su turn are supported by 2 x 8 in. str supported by shores spaced 4 ft. on The joists and stringers are constru be used many times. The allowab allowable horizontal shear stress is

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Sizing Joists and Rafters

In civil engineering and building construction, joists and rafters are the major components including beams and columns. Almost every structural construction including buildings, skyscrapers, bridges, commercial complexes, and so on makes use of joists and rafters to provide structural integrity to the building. Joists are primarily thick long pieces of metals, concrete, or wood that are used to support the floor and ceiling. On the other hand, rafters form the major component of pitched roofs, which are a series of sloped long pieces extending from a ridged area that makes contact with the plane area of the wall. They account for the load-bearing of the building along with the beams.

Question

E.34. The formwork for a 6-in.-thick reinforced concrete floor slab of normal weight consists of
4 in. Class II plyform sheathing supported by 2 x 6 in. joists spaced 2 ft. (o.c), which in
turn are supported by 2 x 8 in. stringers spaced 4 ft. (0.c). The stringers are themselves
supported by shores spaced 4 ft. on centers.
The joists and stringers are constructed with Douglas fir, coastal construction, and are to
be used many times. The allowable flexural stress in the fir members is 1875 psi, the
allowable horizontal shear stress is 180 psi, and the modulus of elasticity is 1,760,000 psi.
For the plyform the corresponding values are 1330 psi, 72 psi, and 1,430,000 psi, with the
stress applied parallel with the face grain. Using a live load of 150 psf, a) Check the
bending and shear stresses in the sheathing, joists and stringers; b) Check deflections
assuming that the maximum permissible deflection of each of these elements is L/360 for
all loads.
11.2. Redesign the formwork system for Class Exercise E34 and select a new adequate plyform
and stringer for this formwork.

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