11.1 INTRODUCTION
A strut is a structural member which is subjected to an axial compressive force. A strut may be horizontal, vertical or inclined with any end fixity condition, e.g., connecting rods, piston rods, etc. But a vertical strut is called a column, e.g., a vertical pillar between a roof and a floor in a building.
Sometimes, a compression member like a column may be subjected to an axial load which may not pass through the geometric axis of the member. In that case, the load induces bending and direct stresses. Such members have to be designed based on bending and direct stresses.
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