Concept of Stress

Concept of Stress

Many things in civil engineering are expressed in terms of stress, rather than forces (loads). The stress (pressure) is found by dividing the force (load) by area. So, Stress = Force / Area So it has units of Newtons per milimeter square, N/mm2 (Mega Pascal – MPa), or pounds per inch square,  lbs/inch2 (psi) for […]

Strength / Mechanics of Materials

In previous section, we dealt with external forces acting on bodies, but we didn’t care about the actual material itself. We thought about ideally rigid materials. We did not consider how strong were our materials, what happens to materials, when forces act on them, how much they deform or and at what point they break. […]

Types of supports

Types of supports

Although we described the concept already, lets summarize here the three types of supports you see in structures and how they are shown: Note that if in real life the beam had supports like that, in fixed support case, it would not move. In hinge supported case, it would only rotate around hinge, as there […]

Forces

Forces

Forces can be as: Compressive Tensile Shear All loads acting on structures are a combination of these forces. In addition, a force can also create a turning affect around a point, which can be of two types, as: Bending Moment (or simply “Moment” because it is very frequent) Torsional Moment (os simply “Torsion”, because it […]

Structural Basics: Forces and Stresses

Structural  Basics: Forces and Stresses

Introduction As we mentioned before, civil engineering is divided into five main branches. Now we will start to introduce the structural branch, and show the basics of probably the most two fundamental concepts in civil engineering, which are used in all branches of civil engineering as well, and not only structural.  These are forces and […]

Free Body Diagram:

Free Body Diagram:

Let’s introduce the first basic concept in statics, free body diagram. See figure below: as can be seen here, a glass rests on a table. For the purpose of statics, this can equally be represented as on right part of the figure. The weight of the glass exerts a force on the table, plus, there […]