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Why do centers of gravity and mass differ?
- Thread starter ersandrn
- Start date
Re: WHY CENTERS OF WEIGHT AND MASS LOOK DIFFERENT Hello
As can be seen in the appendix, these are: The center of gravity and the rigidity center of the floor are different. The calculation forms are different. The building must be symmetrical in both directions in order to overlap."ersandrn":20ts4kvs" said:As far as I know, the centers of gravity and mass must be in the same positions. As a result, gravity affects the center of mass. What is the reason?
Re: WHY CENTERS OF WEIGHT AND MASS LOOK DIFFERENT Mr. Ünver Thank you for your reply; What I want to ask exactly is why are the ROI and PM Values different. One is the center of gravity of the floor and the other is the center of mass of the floor, as you said, the calculation method of the center of stiffness is different. Why did he give the center of gravity and the center of mass in different positions? The center of gravity passes through the center of mass, it must be the same, change?
Ismail Hakki Besler
Administrator
Re: WHY CENTERS OF WEIGHT AND MASS LOOK DIFFERENT Center of Mass: (Xm,Ym) Katin is the center of mass. It is calculated from the mass distribution of the floor. Self-weights, wall loads, moving loads affect the location of the center of mass. Center of gravity : (Xg,Yg) It is the geometric center of the floor calculated from the column and curtain dimensions. Center of stiffness : (Xr,Yr) These are the point coordinates calculated from the column and wall shear forces as a result of horizontal loading. If your structure is the same in terms of both geometry and mass distribution, the center of gravity and center of mass are calculated at the same point. Think of the center of gravity as the geometric center. Design a fully symmetrical structure in terms of column and beam geometries. But let moving loads or wall loads break the symmetry in a corner and get more. While the center of mass of the floor shifts towards that corner, the center of gravity will remain at the center of symmetry. The expression Center of Gravity that appears in the help of the program will be changed to Geometric Center in the next version.