A reinforced concrete beam 300 mm width has an effective depth of 450 mm. It is reinforced with 6 –32 mm Ф at the tension side and 2 – 28 mm Ф at the compression side located at 65 mm from the top. Fy = 345 MPa, fc’ = 34.5 MPa. Assume all steel yields and the contribution of compression steel may not be neglected.

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 12.7P: Estimate the transverse tensile strength of the concrete in Problem 12.6.

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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

A reinforced concrete beam 300 mm width has an effective depth of 450 mm. It is reinforced with 6 –32 mm Ф at the tension side and 2 – 28 mm Ф at the compression side located at 65 mm from the top. Fy = 345 MPa, fc’ = 34.5 MPa. Assume all steel yields and the contribution of compression steel may not be neglected.
1. Which of the following gives the balance steel ratio?
a. 3.8%
b. 5.3%
c. 4.5%
d. 8.4%
2. Which of the following gives the depth of compression stress block?
a. 163 mm
b. 123 mm
c. 134 mm
d. 145 mm
3. Which of the following gives the nominal moment capacity of the beam?
a. 734.5 kN – m
b. 324.6 kN - m
c. 631.2 kN – m
d. 543.4 kN - m

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