structural framing systems

is defined as an enclosed structure for human occupancy, including both the main structure and nonstructural components (e.g., cladding, roofing, interior walls, HVAC systems, electrical systems) that are permanently attached and supported by the main structure.

NEHRP

refers to the load-resisting sub-system of a building or object.

A structural system with bearing walls or bracing systems lacks a complete vertical load-carrying frame for gravity loads. Lateral load resistance is provided by shear walls or braced frames. structural walls offer primary vertical support and lateral resistance. Commonly used in residential construction, warehouses, and low-rise commercial buildings.

Typical materials include concrete, masonry, and wood.

with a complete space frame supports gravity loads, with lateral resistance provided separately by shear walls or braced frames (NSCP Section 208.4.6.2). are commonly used in structures made of structural steel and concrete. weight is supported by vertical columns and horizontal beams.

Lateral resistance is achieved through either diagonal steel braces or concrete, masonry, or timber shear walls, which do not support the building’s weight.

are used in both structural steel and reinforced concrete construction.

In these systems, horizontal beams and vertical columns support the structure's weight and provide strength and stiffness to resist lateral forces.

According to NSCP 2010 Section 208.4.6.3, a structural system with a complete space frame supports gravity loads, with moment-resisting frames providing lateral load resistance through flexural action.

High seismic performance, extensive detailing, suitable for high-risk seismic areas.

Intermediate seismic performance, moderate detailing, suitable for moderate seismic risk areas.

Lower seismic performance, minimal detailing, suitable for low-risk seismic areas.

Stiffness and strength in moment-resisting frame systems are achieved with rigid connections between beams and columns, preventing rotation between these elements.

Moment-resisting frame systems are more costly to construct than bearing wall and braced frame systems.

They are popular because they eliminate the need for braced frames or structural walls, allowing for large open spaces and facades with many unobstructed window openings.