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Why do we need to reduce the live load when we design the structure?

Posted on August 14, 2022 by Author

Why do we need to reduce the live load when we design the structure?

Live load reduction is applied to account for the lower probability that all floors above the column will be fully loaded at the same time. The probability decreases as the number of floor increases which is why there is a larger reduction for larger number of floors above.

What loads does an engineer consider when designing a structural member?

The main types of load which a structure must be able to resist are: Dead loads: Such as the fixtures and structural elements. Live loads: Such as occupants, furniture, traffic. Environmental loads: Such as wind, snow, earthquake, settlement.

What is a live load?

Live load is a civil engineering term that refers to a load that can change over time. The weight of the load is variable or shifts locations, such as when people are walking around in a building. Anything in a building that is not fixed to the structure can result in a live load, since it can be moved around.

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Can you reduce roof live load?

Reduction in roof live loads is allowed per the 2012 International Building Code (IBC), section 1607.12. 2 for ordinary flat, pitched and curved roofs, and awnings and canopies other than of fabric construction supported by a skeleton structure.

Is it required to reduce live load?

Live loads that exceed 100 psf (4.79 kN/m2) shall not be reduced. Exceptions: The live loads for members supporting two or more floors are permitted to be reduced by not greater than 20 percent, but the live load shall be not less than L as calculated in Section 1607.11.

What is live load reduction factor?

The live load reduction factor is defined according to the number of floors supported by the columns, shear walls and footings. Apply values between 0.4 and 1.0 as specified in the “Regulations related to structural criteria in the KS code”.

What loads are considered when designing a building?

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The types of loads acting on structures for buildings and other structures can be broadly classified as vertical loads, horizontal loads and longitudinal loads. The vertical loads consist of dead load, live load and impact load. The horizontal loads comprises of wind load and earthquake load.

What is a live load in construction?

Live loads are those loads produced by the use and occupancy of a building or structure and do not include construction loads, environmental loads (such as wind loads, snow loads, rain loads, earthquake loads and flood loads) or dead loads (see the definition of “Live Load” in IBC 202).

What is a live load in engineering?

Live loads refer to the transient forces that move through a building or act on any of its structural elements. They include the possible or expected weight of people, furniture, appliances, cars and other vehicles, and equipment.

Why are live loads important?

These loads acting on the building structure and increase the dead and self-weight of the structure. It can be assumed by the designer because they live load is one of the major loads in structural design. Those loads are acting uniformly over the whole floor area for the purpose of design.

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When can you reduce live load?

A reduction shall not be permitted where the live load exceeds 100 psf (4.79 kN/m2) except that the design live load for members supporting two or more floors is permitted to be reduced by not greater than 20 percent.

Is snow a dead load?

Live loads are temporary loads; they are applied to the structure on and off over the life of the structure. The most common types of live loads are occupancy (floor) load, workers during construction and maintenance, snow, wind and seismic.

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