# TR.37.7.3.1 Program Defined Push Load Distribution Pattern

If `LOADING PATTERN` is 0 (i.e., STAAD.Pro internally calculates the lateral push load), you are required to define following two inputs.

For all analyses, at least two vertical distributions of lateral load shall be applied. One pattern shall be selected from each of the following two groups. Therefore, two different input files are to be generated. One analysis is to be performed by selecting any one method from Group 1. Another separate analysis is to be performed by selecting Method 3 from Group 2.

## Group 1

- Method 1
- A vertical distribution proportional to the value of C
_{vx}given in Equation (3-12) of FEMA 356 : 2000 is performed. Use of this distribution shall be permitted only when more than 75% of the total mass participates in the fundamental mode in the direction under consideration, and the uniform distribution is also used. - Method 2
- A vertical distribution proportional to the shape of the fundamental mode in the direction under consideration is performed. Use of this distribution shall be permitted only when more than 75% of the total mass participates in the fundamental mode in the direction under consideration, and the uniform distribution is also used.