1. Calculate the compressive stress, which is the compressive stress generated by the vertical pressure acting on the cross section of the rectangular tube. The pressure (in N) divided by the cross-sectional area of the rectangular tube (in m squared). As long as the compressive stress is less than the allowable stress of the material.

2. The stability must be calculated when the square tube is under pressure. It depends on whether the connection method is fixed at both ends or fixed at one end and hinged at the other end. Simple calculation of critical pressure: P=(4*n*Pi^2*E*I)/[(L/2)^2]. The number of n columns, pi^2 is the second power of the shot, E modulus of elasticity, I moment of inertia, and L column length.

They are simple calculations. Safety factors and seismic loads also should be considered. You need to analyze it in different specific situation and look for professional advise.

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