Maximum value of slenderness ratio of lacing flats in a steel column is 145.

Explanation:

In steel columns, lacing flats are used to provide stability and support to the column. The slenderness ratio of lacing flats is an important parameter that determines their maximum allowable value.

The slenderness ratio of lacing flats is defined as the ratio of the length of the lacing flat to its least width. It is a measure of how slender the lacing flat is and indicates its ability to resist buckling under compressive loads.

Factors affecting the slenderness ratio:
There are several factors that affect the maximum allowable slenderness ratio of lacing flats in a steel column, including:

1. Material properties: The strength and stiffness of the material used for the lacing flat will determine its ability to resist buckling. Higher strength and stiffness will allow for a higher slenderness ratio.

2. Connection details: The method of connection between the lacing flat and the column will also influence the slenderness ratio. A stronger and more rigid connection will allow for a higher slenderness ratio.

3. Loading conditions: The type and magnitude of the loads applied to the lacing flat will affect its slenderness ratio. Higher loads will require a lower slenderness ratio to ensure stability.

4. Design codes and standards: Different design codes and standards may have specific requirements for the slenderness ratio of lacing flats. It is important to follow these guidelines to ensure the safety and stability of the structure.

Maximum slenderness ratio:
The maximum allowable slenderness ratio for lacing flats in a steel column is typically determined based on the above factors and industry standards. In this case, the maximum value of 145 is determined as per the specific design code or standard applicable to the structure. This value ensures that the lacing flat is adequately stable and can resist buckling under the given loading conditions.

It is important to note that the maximum slenderness ratio may vary for different types of columns and design scenarios. Therefore, it is crucial to consult the relevant design codes and standards to determine the specific maximum slenderness ratio for lacing flats in a steel column.