Determine if a W27 × 84 beam in an existing building can carry a point load of 120kips in the center of the span. Assume the beam is simply supported and the span is 24ft. Also, assume the top flange is fully braced for the entire span. Use A36 steel and ASD method. If the beam does not have enough capacity, reinforces the beam using a 5/8" thick plate. Determine the width and the length of the plate.

Determine if a W27 × 84 beam in an existing building can carry a point load of 120kips in the center of the span. Assume the beam is simply supported and the span is 24ft. Also, assume the top flange is fully braced for the entire span. Use A36 steel and ASD method. If the beam does not have enough capacity, reinforces the beam using a 5/8" thick plate. Determine the width and the length of the plate.

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

Determine if a W27 × 84 beam in an existing building can carry a point load of 120kips in
the center of the span. Assume the beam is simply supported and the span is 24ft. Also,
assume the top flange is fully braced for the entire span. Use A36 steel and ASD method. If
the beam does not have enough capacity, reinforces the beam using a 5/8" thick plate.
Determine the width and the length of the plate.

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Step 2: Calculation of maximum bending moment and design strength

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Step 3: Step 3 Calculation of plastic section modulus after adding the flange plate

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Step 4: Calculation of plastic centroid

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Step 5: Calculation of b

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