# What is structural load in construction?
**A structural load is any force, weight, or pressure applied to a building or structure that its components must be designed to resist. Structural loads are the starting point of all structural engineering calculations — every beam, column, foundation, and connection in a building must safely transfer these loads to the ground. Failing to account for all relevant loads can lead to structural failure, excessive deflection, or collapse.**
## Application
Structural loads are generally classified into several categories:
– **Dead loads (permanent loads)** — the self-weight of the structure and all permanently attached components, including walls, floors, roofing, finishes, and fixed installations. Dead loads remain constant over the life of the building and are relatively easy to calculate.
– **Live loads (imposed loads)** — variable loads caused by the use and occupancy of the building, such as people, furniture, stored goods, and movable equipment. Building codes specify minimum live load values for different types of occupancy.
– **Wind loads** — lateral forces caused by wind pressure acting on the exterior surfaces of the building. Wind loads can be particularly critical for tall buildings, lightweight structures, and buildings in exposed locations.
– **Snow loads** — the weight of accumulated snow and ice on roofs and other horizontal surfaces. Snow loads vary greatly depending on geographic location, altitude, and roof shape.
– **Seismic loads** — dynamic forces generated by earthquakes that cause lateral and vertical movement of the structure. Buildings in seismically active regions must be specifically designed to resist these forces.
– **Thermal loads** — stresses caused by temperature changes that cause materials to expand or contract.
Structural engineers use load combinations prescribed by building codes to determine the most critical loading scenarios. These combinations apply safety factors to each load type to ensure the structure can withstand the worst-case conditions with an adequate margin of safety.
Understanding structural loads is fundamental not only for engineers but also for anyone involved in construction, renovation, or DIY projects that affect load-bearing elements.
## Related terms
– Dead load
– Live load
– Wind load
– Roof loads
– Load-bearing wall
– Foundation
– Structural engineering
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