Deflection in load combination is higher than in loads

[WolfgangK]

I have created a simple structural model with timber beams. I am finding however that the deflection in the load combinations is greater than the sum of the deflections in load cases. I have even tried only applying load factors of 1 to eliminate variables, but I am still finding deflections are higher than they should be in the load combinations. Internal forces i.e. shear and bending remain the same. The loading is a vertical member load so there shouldn't be any major second-order effects.

I changed the material of one beam to steel and the problem disappeared.

Any advice is appreciated.

[Frank Faulstich]

Hello WolfgangK,

Have you activated this check box in calculation parameters?



This reduces the stiffness by gamma_M and increases the deflection.

Frank Faulstich