Abstract
This paper aims to study the deformational behaviour of tensile-type viscoelastic dampers under different earthquake excitation directions. A method for calculating the corresponding equivalent additional stiffness and damping of a self-centring-segment bridge pier is derived. Using the displacement-based seismic design method, a design method for self-centring-segment bridge piers with tensile-type viscoelastic dampers is proposed. Using the proposed method, a self-centring-segment bridge pier is designed. Based on dynamic analysis of the finite element model by OpenSees, the effectiveness of the proposed seismic design method is validated.
Highlights
Et al [1, 2] first proposed the concept of employing unbounded post-tensioned tendons in RC structures in 1993
In view of the complex mechanical properties of precastsegment bridge pier joints, some researchers have carried out related numerical simulation studies on the joints, compared the results with experimental data, and obtained good simulation results
Sideris [5] used Abaqus to simulate the hysteretic performance of precast-segment bridge piers with slide-opening joints and conducted a comparative analysis of the simulation results and experimental data, and the correctness of the finite element simulation results was verified
Summary
Et al [1, 2] first proposed the concept of employing unbounded post-tensioned tendons in RC structures in 1993. Based on the geometric and material symmetry characteristics of precast-segment bridge piers, Wang et al [16, 17] established an equivalent plastic hinge model of posttensioning precast-segment ultrahigh-performance concrete bridge columns and discussed the influences of seven related parameters on the energy dissipation and self-centring capacity of the piers. Is paper aims to study the deformational behaviour of tensile-type viscoelastic dampers under different earthquake excitation directions, and a method for calculating the corresponding equivalent additional stiffness and damping of the self-centring-segment bridge pier is derived. Equivalent Additional Stiffness and Damping Ratio of Tensile-Type Viscoelastic Dampers It is well-known that self-centring bridge piers generally sustain small structural damage owing to the noncontinuous joint between the piers and foundation and the post-tensioned tendons. According to the deformation relationship between the precast-segment concrete pier and viscoelastic damper, the axial deformation of the damper can be expressed as follows: MP
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