动载作用下钢筋混凝土梁的自振特性与动力响应

利用ABAQUS对钢筋混凝土梁进行模拟，比较了前5阶固有频率，得知不同配筋情况下梁固有频率所差百分比皆小于5%，故配筋对混凝土梁固有频率的影响可忽略不计，介绍了混凝土损伤塑性本构模型和有限元建模Embedded技术，模拟了4种不同动载作用下不同配筋情况的梁的力学响应，得知梁受载时的危险部位均在支座处，故在实际中应该注意在梁柱节点处加强其刚度和整体性。通过比较3种不同配筋情况的梁在不同动载作用下的力学响应，得知钢筋对于混凝土梁的应力变形等都有较大的影响，钢筋起到了分担混凝土梁应力及减小梁变形的作用。

Natural vibration characteristics and dynamic response of reinforced concrete beam under the effect of dynamic load

In this paper，the writers used ABAQUS to proceed simulation of these beams，and the first five order natural frequencies were compared. Through comparing and analyzing，it can be obtained that，the difference of natural frequency of these beams are less than five percent with different reinforcement conditions. Therefore rebar＇s effect on natural frequency of the concrete beam can be neglected. In this paper，the authors introduced the concrete damage plasticity constitutive model and the technology of embedded about finite element modeling. The writers simulated mechanical response of the beam in the case of different reinforcement condition with the four different dynamic loads，and the conclusion can be drawn that，the beam support is the most dangerous place through the above simulation，so we should pay attention to strengthen its rigidity and integrity in the beam-column node in practice. By comparing mechanical response of three beams of different reinforcement condition under different dynamic loads，it was proposed that rebar has a considerable effect on the stress and deformation of concrete beam. As a matter of fact，rebar plays a role to share the stress of concrete beam and reduce the deformation of beam.