2. A simply supported beam (Span /=25 ft) has a section as shown below with concrete compressivestrength f=4000 psi (normal weight), and flexural reinforcement strength f,=60,000 psi. The unfactoreddead load is 1.5 kips/ft including its self-weight and the unfactored live load is 2.0 kips/ft.16*21"24"6 No. 8 barswiftMpost2Amid384El48ETFigure P4a) Determine the moment of inertia of cracked section lrb) Determine the effective moment of inertia le for the beamc) Calculate the immediate and long-term deflections at the midspan of the beam, assuming 40% of thelive contribute to the long-term deflection

a) Cracked moment of inertia Icr Icr =b(kd)33+nAsd-kd2n= E1Ec =600004000 =15B=bnAs…

2. A simply supported beam (Span =25 ft) has a section as shown below with concrete compressive strength f=4000 psi (normal weight), and flexural reinforcement strength f=60,000 psi. The unfactored dead load is 1.5 kips/ft including its self-weight and the unfactored live load is 2.0 kips/ft. 16" 21" 24" 6 No. 8 bars

2. A simply supported beam (Span =25 ft) has a section as shown below with concrete compressive strength f=4000 psi (normal weight), and flexural reinforcement strength f=60,000 psi. The unfactored dead load is 1.5 kips/ft including its self-weight and the unfactored live load is 2.0 kips/ft. 16" 21" 24" 6 No. 8 bars

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

Design criteria for structural loading

The different loads such as loads due to self-weight (dead load) and external loads such as live load, wind loads, seismic load, snow load, and other loads and load combinations that influence the design of a building are called structural loading. The nature of the applied load differs from changes in the location, design, and type of materials used. The design criteria require that structures must be designed and constructed to be able to withstand all load types that are expected to act upon the structure and render its usage for the designated purpose. The structural members such as beams, slabs, columns, and foundations help the structure to withstand the applied load. There are different institutes such as ASCE and ACI that provide building design codes to assure minimum safety requirements and quality of the structures.

Question

2. A simply supported beam (Span /=25 ft) has a section as shown below with concrete compressive
strength f=4000 psi (normal weight), and flexural reinforcement strength f,=60,000 psi. The unfactored
dead load is 1.5 kips/ft including its self-weight and the unfactored live load is 2.0 kips/ft.
16*
21"
24"
6 No. 8 bars
wift
Mpost2
Amid
384
El
48
ET
Figure P4
a) Determine the moment of inertia of cracked section lr
b) Determine the effective moment of inertia le for the beam
c) Calculate the immediate and long-term deflections at the midspan of the beam, assuming 40% of the
live contribute to the long-term deflection

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