1. Questions – Elasticity and Plasticity
Elasticity and plasticity in building engineering, the initial presumptions of the clasic linear elasticity.
The term of the plasticity, the small deformation theory, the theory of the II.order. Stress, state of stresses of a member.
Relations between stresses and internal forces in a member. The main types of stresses – simple and combined. Saint – Venant principle of local effect.
Deformations and displacement of a member, Hook´s law, linear elastic material, physical constants.
Stress-strain diagrams of building material, non-elastic and ideal elastic-plastic material, ductility, deformations from temperature change.
Stress at axial loading (tension, compression), deformation of tensile or compressed members, design and assessment of axial loaded member.
Simple torsion, determining of stress and deformation of a circle and a pipe cross section bar.
Torsion at the noncircular members and torsion at thin – walled profiles.
Bending of members in elastic state, bending stress, neutral axes, section modulus, bending of the members at non-symmetrical sections, design and the assessment of bending members.
Eccentric tension and compression and the core of the section.
Shear stress in bending of rectangular cross sections, shear stress in bending of thin-walled members, shear centre.
Schwedlers relationship, differential equation of elastic curve.
Stability and members in buckling - Euler´s formula for the critical load of columns, critical lenght of column for various end conditions, Euler´s curve.
Stresses in splay cut in plane stress, principal stresses in plane stress, directions of principal stresses, graphic solution of principal stresses by the Mohr´s circle.