Honeycomb panels enable the use of popular high-quality building materials, and their applications are ubiquitous. China is also vigorously developing the application of honeycomb panel materials. Today we will understand the formula for the bending section coefficient of the honeycomb panel.
The equivalent bending section factor We and the equivalent bending stiffness De of the honeycomb panel will be briefly described below.
First, the calculation formula for the maximum stress design value of the bending section of the honeycomb panel is
σ=(m qL2/W)η≤fa ............................................................ (1)
In formula (1), σ—the maximum normal stress of the plate surface (N/mm2);
m — bending moment coefficient, which can be found from the relevant table, and is related to the ratio of the short side to the long side of the board area;
q — load perpendicular to the deck (N/mm2);
L — the short side length (mm) of the board grid;
We — equivalent bending section factor (mm3/mm);
η - reduction factor, which can be found from the relevant table, and is related to the parameter θ (ratio of deflection to thickness);
Fa— Honeycomb panel strength design value.
It is not difficult to see from equation (1) that the equivalent bending section coefficient We is inversely proportional to the maximum normal stress σ of the plate surface, that is, when the plate area and the load perpendicular to the plate surface are constant, We are large and σ is small. The safer it is. In other words, the large honeycomb panel can withstand a larger load perpendicular to the panel surface when the maximum normal stress of the panel does not exceed the panel strength design value fa and the panel region. Or, in the case where the load design value perpendicular to the board surface is constant, the board area of the Wed honeycomb panel can be designed to be larger (ie, the reinforcing ribs are reduced), the profile and the labor cost.
Second, the calculation formula of the maximum deflection of the honeycomb panel under wind load is
Df=(μWKL4/ De)η ............................................................ (2)
In formula (2), df—the maximum deflection (mm) under wind load;
Μ-deflection coefficient, which can be found from the relevant table, and is related to the ratio of the short side to the long side of the panel;
WK—wind load perpendicular to the deck (N/mm2);
De—equivalent bending stiffness (Nmm2/mm);
The meaning of the remaining symbols is the same as in equation (1).
It can be known from formula (2) that the equivalent bending stiffness De is inversely proportional to the maximum deflection df under the wind load, that is, when the plate area and the wind load perpendicular to the plate surface are constant, De is large and df is small, that is, the plate The bending deformation is small. Or, in the case of the same plate area and deflection, the large honeycomb panel can withstand greater wind loads. Or, in the case where the wind load standard value and the design deflection maximum are constant, the panel area of the large honeycomb panel can be designed to be larger (ie, the reinforcing ribs are reduced), the profile and the labor cost.
The above is the formula for the bending section coefficient of the honeycomb panel. It may not be that professionals can't read these things, but knowing more about them will help you when you buy them.
