Column Buckling Test
Higher Certificate in Civil Engineering
Subject : Structural Analysis I - Laboratory Report
Laboratory Venue : HKIVE (Tsing Yi), Room CL02
Date & Time : 15 October 2001, 19:00 to 20:15
Experiment No. 1 : Column Buckling Test
Objective:
1. To study the effect of support conditions on the load, carrying capacity of a slender column.
2. To compare the experimental buckling loads Pcr of test specimens with those predicted by the Euler equation.
Apparatus:
1. SM 105 strut apparatus (Issuing Voucher: 0203141 & Inventory Ledger: CN/s/01/10),
2. Aluminum bar specimen (20 x 3 x 600 mm approximate),
3. Measuring ruler,
4. Venier caliper.
Theory:
The factors affecting the column’s load – carrying capacity are the connection between the slenderness of the column and its tendency to buckle, the influence of the ‘fixity’ of the ends of the column, and the shape of its section on that slenderness.
When the line of action of the resultant load is coincident with the centre of gravity axis of the column (Fig. 1a), the column is said to be axially loaded and the stress produced in the material is said to be a direct compressive stress. This stress is uniform over the cross-section of the column. The term concentric loading is sometimes used instead of axial loading.
When the load is not axial, it is said to be eccentric (i.e. off-centre) and bending stress is induced in the column as well as a direct compressive stress (Fig. 1b). It has the effect of increasing the compression on the area to the right and decreasing the compression on the portion to the left.
For design factors, the maximum axial load a column can be allowed to support depends on the material of which the column is made and the slenderness of the column.
The slenderness involves not only the height of the column, but also the size and shape of its cross-section and the manner in which the two ends of the column are supported or fixed. A very short column will fail due to crushing of the material, but
Subject : Structural Analysis I - Laboratory Report
Laboratory Venue : HKIVE (Tsing Yi), Room CL02
Date & Time : 15 October 2001, 19:00 to 20:15
Experiment No. 1 : Column Buckling Test
Objective:
1. To study the effect of support conditions on the load, carrying capacity of a slender column.
2. To compare the experimental buckling loads Pcr of test specimens with those predicted by the Euler equation.
Apparatus:
1. SM 105 strut apparatus (Issuing Voucher: 0203141 & Inventory Ledger: CN/s/01/10),
2. Aluminum bar specimen (20 x 3 x 600 mm approximate),
3. Measuring ruler,
4. Venier caliper.
Theory:
The factors affecting the column’s load – carrying capacity are the connection between the slenderness of the column and its tendency to buckle, the influence of the ‘fixity’ of the ends of the column, and the shape of its section on that slenderness.
When the line of action of the resultant load is coincident with the centre of gravity axis of the column (Fig. 1a), the column is said to be axially loaded and the stress produced in the material is said to be a direct compressive stress. This stress is uniform over the cross-section of the column. The term concentric loading is sometimes used instead of axial loading.
When the load is not axial, it is said to be eccentric (i.e. off-centre) and bending stress is induced in the column as well as a direct compressive stress (Fig. 1b). It has the effect of increasing the compression on the area to the right and decreasing the compression on the portion to the left.
For design factors, the maximum axial load a column can be allowed to support depends on the material of which the column is made and the slenderness of the column.
The slenderness involves not only the height of the column, but also the size and shape of its cross-section and the manner in which the two ends of the column are supported or fixed. A very short column will fail due to crushing of the material, but