This topic will cover the fundamental principles of structural systems in architecture, including the role of structures in supporting buildings, basic terminology, and the relationship between form and structure.
Introduction to Structural Systems
Key concepts, classifications, and design considerations
| Aspect | Description |
|---|---|
| Definition | An arrangement of interconnected members that transfers loads from the point of application to the supports, ensuring stability, strength, and serviceability. |
| Purpose | - Safely carry dead, live, environmental, and accidental loads. - Provide rigidity (resistance to deformation). - Allow controlled movement (thermal expansion, seismic drift). |
| Components | - Primary structural elements (beams, columns, walls, slabs, foundations). - Secondary elements (bracing, ties, connections). - Load‑path (the route loads travel from application to ground). |
| Load | Typical Sources | Effect on Structure |
|---|---|---|
| Dead load | Self‑weight of structural members, permanent finishes, fixed equipment | Constant, predictable; governs size of members. |
| Live load | Occupants, furniture, movable equipment | Variable; design based on occupancy category. |
| Environmental loads | Wind, snow, rain, temperature, humidity | May cause lateral forces, uplift, or differential movement. |
| Seismic load | Ground motion during earthquakes | Inertial forces; requires ductility and energy‑dissipation mechanisms. |
| Other | Impact, blast, fire, settlement | Special design provisions (e.g., impact factors, fire resistance). |
| System | Typical Materials | Main Load‑Carrying Mechanism | Common Applications |
|---|---|---|---|
| Frame (Beam‑Column) System | Steel, reinforced concrete, timber | Bending of beams and axial/compression in columns | Office buildings, warehouses, residential high‑rise |
| Shear‑Wall System | Reinforced concrete, masonry, steel plate | In‑plane shear resistance, vertical load transfer | High‑rise residential, schools, hospitals |
| Braced Frame | Steel, timber | Diagonal bracing carries shear; columns resist axial loads | Industrial facilities, warehouses |
| Moment‑Resisting Frame | Steel, reinforced concrete | Rigid connections develop bending moments at joints | Seismic‑resistant buildings, high‑rise towers |
| Truss System | Steel, timber, aluminum | Axial tension/compression in members; negligible bending | Roofs, bridges, long‑span arenas |
| Space Frame | Steel, aluminum, composite | 3‑D network of members; distributes loads in multiple directions | Airports, exhibition halls, stadiums |
| Load‑Bearing Wall System | Masonry, concrete block, timber | Walls directly support vertical loads | Low‑rise residential, small commercial |
| Hybrid Systems | Combination of above | Tailored to performance, cost, and architectural needs | Modern high‑rise, mixed‑use towers |
| Element | Role | Typical Shapes / Sections |
|---|---|---|
| Beam | Transfers loads horizontally to columns or walls; resists bending and shear. | I‑section, rectangular, T‑beam, box, flanged, T‑shaped. |
| Column | Carries axial compression (and sometimes bending) from upper elements to foundations. | Square, rectangular, circular, I‑shaped, tapered. |
| Slab | Provides floor/roof surface; distributes loads to beams/walls. | One‑way, two‑way, flat plate, ribbed, waffle. |