Dynamic analysis of prestressed concrete beams in service

Resumo

The study and improvement of research related to the structural dynamics are more relevant to each
development leap of new techniques and materials used in constructing new buildings. These buildings have been
designed with a bolder look due to advanced technical regulations for using concrete and steel with high strength.
These constructions have become more susceptible to actions that can generate significant vibrations in the
structure and make them increasingly efficient, which requires intelligent vibration control. Allied to these factors,
the evolution of theoretical models allows an accurate analysis of the system, which architects and structural
engineers widely explore. The dynamic analysis of concrete beams submitted to these actions is justified because
these elements undergo a high degree of bending during service, resulting in a significant stiffness loss by cracking.
The prestressing applied to these structures has become an effective and widely used technology, avoiding, in most
cases, the development of tensile stresses, allowing the maintenance of stiffness necessary for vibration control
during service. This work investigates the dynamic structural behavior of a reinforced concrete beam during its
service. Its behavior is studied due to vertical loads in operation and axial loads from the prestressing action.
Besides, the influence of the fundamental dynamic parameters in beam behavior is verified due to these actions.
The results obtained are compared with the recommendations prescribed in the national and international codes.