kleinlogel_rigid_frame_formulas_tj v1.0.0

Kleinlogel Rigid Frame Formulas

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when using the kleinlogel rigid frame formulas, the columns above the level of the tie beam are the main columns. so to use the formulas, all of the equations and values must be entered for the columns above the tie beam. remember that the formulas are based on the column being sized as a single unit, even though the beam is bolted to it. the tie beam is treated as a simple column of the same size as the columns above it.

the formulas are accurate enough that they can be used to calculate the needed beam and column sizes for a design that uses the tie beam and cap beam. the formulas are not perfect, however, because the beam sizes are not always linear to the length of the beam. if the beam length is 50 feet, the beam is normally sized to carry 500 pounds per linear foot. if the beam length is 100 feet, the beam is normally sized to carry 1,000 pounds per linear foot. the more the beam is short of the total length, the higher the weight that the beam is sized for.

the formulas can also be used for a design using a reinforced concrete beam and columns. if the columns are deep enough, the beam can be cast out and the columns below the beam can be sized for a full story. the formulas are based on the full story being sized to carry the total dead load. the formulas are based on columns that are sized to carry the weight of the beam. if the columns are too small, the beam will sag and the design will not work. the formulas will not work for buildings that use steel beams with shear connectors.

kleinlogel found that these effects cannot be accounted for by a double-framing approach, and the rigid-frame building was born. a rigid frame is simply a framework composed of perpendicular connecting bars, beams and columns without joints or large deflections. note that a rigid frame supports a load distributed to the outer walls of the building, not directly over the beams and columns. however, the connection of these members to the rigid frame may involve joints that allow for deflections and rotations. the rigid frame can be thought of as a “rigid skeleton”, which is attached to the walls, floors, and ceilings of the building. the building is then held rigidly together by the connections of the rigid frame to the walls, floors and ceilings. the main advantage of a rigid frame is that it is easy to analyze using statics and it has no shear forces. however, the most obvious disadvantage of a rigid frame is that its members cannot transmit loads directly to the load-bearing walls of the building and the load on the foundation must be distributed to the rigid frame. most often the rigid frame is located below the building to reduce the amount of load on the foundation, or the floors are built on top of the rigid frame. 84d34552a1