Q7/ A precast beam is to be used as a bridge over a small roadway. Concrete dimensions are b= 500 mm, and h = 700 mm. The effective depth d = 600 mm. Concrete and steel strengths are 42 MPa and 420 MPa, respectively. Using approximately one-half the maximum tensile reinforcement permitted by the ACI Code (select the actual size of bar and number to be used), determine the design moment capacity of the girder. If the beam is used on a 9 m simple span, and if in addition to its own weight it must support railings, curbs, and suspended loads totaling 7 kN/m, what uniform service live load limit should be posted?

Q7/ A precast beam is to be used as a bridge over a small roadway. Concrete dimensions are b= 500 mm, and h = 700 mm. The effective depth d = 600 mm. Concrete and steel strengths are 42 MPa and 420 MPa, respectively. Using approximately one-half the maximum tensile reinforcement permitted by the ACI Code (select the actual size of bar and number to be used), determine the design moment capacity of the girder. If the beam is used on a 9 m simple span, and if in addition to its own weight it must support railings, curbs, and suspended loads totaling 7 kN/m, what uniform service live load limit should be posted?

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

Q7/ A precast beam is to be used as a bridge over a small roadway. Concrete
dimensions are b= 500 mm, and h = 700 mm. The effective depth d = 600 mm.
Concrete and steel strengths are 42 MPa and 420 MPa, respectively. Using
approximately one-half the maximum tensile reinforcement permitted by the ACI
Code (select the actual size of bar and number to be used), determine the design
moment capacity of the girder. If the beam is used on a 9 m simple span, and if in
addition to its own weight it must support railings, curbs, and suspended loads
totaling 7 kN/m, what uniform service live load limit should be posted?

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drawing stress strain distribution

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determining depth of neutral axis

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determining design moment capacity

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determination of uniform service load limit

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