Design shopping mall columns below the roof and below the floor, assuming the following: • f'c = 30mPa • Use 25M for Longitudinal bars. . Concrete cover = 30mm to ties • Circular shape, select size so it can be designed as short column, Ignore self-weight of columns. Roof Tributary area = 90m2 • • Roof slab thickness is 220mm thick • SDL roof/floor = 1.5kPa • Roof snow = 3.0kPa, floor live load is 4.8kPa • Assume eccentricity = 15% of column diameter. • Assume M1/M2 =0.5, single curvature • Assume column is pin-connected top and bottom. Use 1% vertical steel as a starting point. .

Design shopping mall columns below the roof and below the floor, assuming the following: • f'c = 30mPa • Use 25M for Longitudinal bars. . Concrete cover = 30mm to ties • Circular shape, select size so it can be designed as short column, Ignore self-weight of columns. Roof Tributary area = 90m2 • • Roof slab thickness is 220mm thick • SDL roof/floor = 1.5kPa • Roof snow = 3.0kPa, floor live load is 4.8kPa • Assume eccentricity = 15% of column diameter. • Assume M1/M2 =0.5, single curvature • Assume column is pin-connected top and bottom. Use 1% vertical steel as a starting point. .

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

Lu
4500 mm
TYPICAL
1. Design shopping mall columns below the roof and below the floor,
assuming the following:
•
f'c = 30mPa
Use 25M for Longitudinal bars.
•
Concrete cover = 30mm to ties
• Circular shape, select size so it can be designed as short
column, Ignore self-weight of columns.
•
Roof Tributary area = 90m2
•
Roof slab thickness is 220mm thick
•
SDL roof/floor = 1.5kPa
• Roof snow = 3.0kPa, floor live load is 4.8kPa
• Assume eccentricity = 15% of column diameter.
• Assume M1/M2 =0.5, single curvature
• Assume column is pin-connected top and bottom.
• Use 1% vertical steel as a starting point.
Roof slab
Show your Design Summary in on an
Elevation and a cross section
Determine:
1. Estimate column size based on axial load only
2. Check short column condition
3. Select bar Size of longitudinal bars and calculate gamma
4. Calculate the longitudinal reinforcing with the interaction diagrams......
5. Check Bar Spacing
6. Determine transverse reinforcing ties size and spacing...
Floor slab

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Step 1: Estimation of column size.

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Step 2: Check for Short column condition.

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Step 3: Select bar Size of longitudinal bars.

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Step 4: Calculate the longitudinal reinforcing with the interaction diagrams.

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Step 5: Check bar spacing.

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Step 6: Determine transverse reinforcing ties size and spacing.

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