Civil engineering

Structural loads, stress and strain, trusses, and the Tacoma Narrows collapse

What is civil engineering?

Civil engineering is the branch of engineering concerned with designing, building, and maintaining the physical structures and infrastructure that society depends on — buildings, bridges, roads, dams, and water systems.

Structures and loads

Every structure a civil engineer designs must safely support the forces acting on it, called loads. Dead loads are the structure's own permanent weight; live loads are variable weights like people, vehicles, or furniture; and environmental loads come from wind, earthquakes, and snow. Structural engineering, a core part of civil engineering, is fundamentally about designing a structure strong and stiff enough to safely carry all the loads it might realistically experience.

Materials engineers rely on

Civil engineers work primarily with a handful of core materials: concrete (strong under compression, meaning being squeezed together, but weak under tension, meaning being pulled apart), steel (strong under both compression and tension, but more expensive), and reinforced concrete (concrete strengthened with embedded steel bars, combining the useful properties of both materials). Choosing the right material and structural design for a given situation is central to safe, cost-effective construction.

Infrastructure beyond individual buildings

Civil engineering also covers infrastructure serving entire communities: road and rail networks, water supply and wastewater treatment systems, dams and flood control, and large-scale earthworks. These systems must be planned not just for individual safety and function, but for how they'll perform reliably over decades of continuous, heavy use.

Why civil engineering matters

Civil engineering makes possible the buildings, bridges, roads, and water systems that modern society depends on every single day, and it directly protects public safety by ensuring these structures can withstand the loads and conditions they will realistically face throughout their working lifetime.