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What is a Moment Frame?

Special Moment Frame are box-shaped frame, with special joints or moment connections which aid in the resistance of earthquakes and wind. The frame allows a structure to bend as required to ensure the building's stability. There are three kinds of frames for momentary use: normal moments frames (OMF) as well as intermediate moments frames (IMF) as well as special moments frames (SMF).

The term "moment" within the sense of moment frame, also known as joint refers to the force that a structure encounters when it is under weather conditions such as earthquakes or wind. If the force is applied in such a manner to a structural component that it bends, it is referred to as bending moment. The structure has to contend with two major kinds of force. The first is the outer force, which is resulted by the force of wind.

It is the same force on a person when they're in the midst of the midst of a powerful wind. Another type of inner force, similar to that of an earthquake, that comes from the ground. One can experience something similar while standing on a train which takes off in a hurry and then they are shaking from the feet upwards.

The purpose of buildings is to bend under moderate force and then return to their original condition. This is referred to as elastic. Like any rubber band structure must not undergo any permanent changes due to being bent or stretched slightly and for a short time.

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To withstand in the event of a major earthquake however, the reverse is valid. A structure that is constructed correctly must be in a state of repair following the occurrence of a major earthquake. The frame must be flexible and absorb energy with no fall. If the frame is not constructed correctly, it can become fragile and break under extreme conditions. This was the case in Northridge, California in 1994 after a devastating earthquake destroyed buildings and led to the adoption of modern moments frame construction techniques.

The Federal Emergency Management Agency (FEMA) has rules in place to safeguard structures from major destruction. They have established the standards structures in seismically active regions are expected to maintain in place, which includes the construction frame systems for momentary frames. Frame systems are divided into three kinds.

A normal Moment frame (OMF) is utilized in low seismic areas and is believed to be elastic in regular conditions. They don't possess the strict standards which a moment frame that is used in high seismic regions must meet. They're not designed to manage any interstory shift and, therefore, the floors shouldn't move in relation to one another.

A Intermediate Moment Frame (IMF) is commonly used in mid- to low-seismic zones. They are designed to withstand some damage that is permanent after a certain amount of force. They are designed to endure the slightest interstory drift.

A specific Moment frame (SMF) is utilized in high-seismic and mid-seismic regions. They are designed to endure massive permanent damage resulting from extreme forces. They are required to withstand a large amount that is interstory drift.

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Moment Frames

A fundamental element of engineering called the frame is a two-dimensional set of interconnected parts joined. The members aren't necessarily straight and could be joined at any point across their entire length. In real-world constructions, moments frames that span 2 orthogonal direction are typically joined to create an equilateral frame made composed of beams and columns.

Moment frames are made to carry horizontal and vertical loads within the same plane but they may also be drawn upon to resist horizontal loads that are outside the frame's plane. They are found in many different materials as well as application in the building industry.

Moment frames are specific type of frame that has rigid connections between its members. This design is able to be able to resist overturning and lateral forces due to the bending force and shear strength inherent in its members as well as the joints connecting them. Thus the strength and stiffness that the seismic moment frames have is dependent on the strength and stiffness that its components.

Because moment frames are less flexible than some alternatives such as wall shears, they can accommodate greater movement during earthquakes. The non-flexible components that are attached to the frame like the cladding should be constructed to accommodate the extra movement in order to prevent injury.

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