Concrete Short Columns - Design Practices

An example of a slab on a concrete short column
A short concrete column used in freeway design

Short Column Criteria:

To check if a short column is present then the following conditions must be met. Otherwise check to see if you fit under the Concrete Long Column Design type procedure. Ideally, solving for a short column will be easier than a long column.

If the structure is part of a braced system then:

{kl_u\over{r}}\le 34-12{M_1\over{M_2}}\le 40

If the structure is part of a unbraced system then:

{kl_u\over{r}}\le 22

where:

k = the effective length factor (can be conservatively taken as 1.0 [1])
lu = clear height of the column
M1 = the smaller absolute value of the two end moments acting on the column
M2 = the larger absolute value of the two end moments acting on the column
r = radius of gyration

Concrete Short Column Analysis

Several methods for concrete short column design have been provided below including:

References:

  1. American Concrete Institute, "Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (ACI 318R-05)", 2005
    1. From Section 10.12.2

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