Research On Seismic Performance Of Segmented Self-centering Hollow Piers With Rounded Rectangular Cross Section

Segmented self-centering pier with convenient assembly, earthquake is easy to repair, and other prominent advantages, which has been proved is accelerated bridge construction and effective method to reduce the traffic blocking pressure. However, due to the lack of the segmented self-centering pier is located in high seismic risk area of seismic performance cognition and the wide application of this kind of structure system is restricted. The main purpose of this paper is to study the seismic performance of segmented self-centering hollow piers with rounded rectangular cross section.The main work done in this paper is as follows:(1)Based on the comprehensive reading and understanding of related literature, structure types and mechanical characteristics, research status at home and abroad, theoretical and experimental research methods, the application of practical engineering of segmented self-centering hollow piers with rounded rectangular cross section were systematically reviewed and summarized.(2)Four large-scale segmented self-centering hollow piers with rounded rectangular cross section were designed, and the experimental scheme and the processing of the components were completed.Attribute of steel bar, concrete and prestressed reinforcement are described,the dimensions of a member section and connection way and the tension control stress are determined and test loading system and loading scheme design are completed.The processing process of test component is detailed recorded,and the test process and notes is detailed description.(3)The OpenSees software is introduced, and the material constitutive relation, the finite element model and the model element of bridge pier are introduced in detail. The modeling method of the self-centering bridge pier component is determined, and the correctness of the finite element model is verified by the finite element model. A finite element model according to the four large scale model of the design of components, and carries on the numerical pseudo static loading test.The calculation results including hysteretic characteristics, restoring force characteristics, stiffness and energy dissipation are analyzed,The seismic performance of different segmented self-centering hollow piers with rounded rectangular cross section are comprehensive evaluation.(4)Based on one of four large proportion of components, changing the connection structure condition, prestressed condition, I-steel condition and energy dissipating bars condition, the component design is completed. Under different working conditions, the bridge piers are analyzed and calculated, and the hysteretic characteristics, restoring force characteristics and energy consumption performance are compared and analyzed.Which provide constructive reference for the design and improvement of the segmented self-centering hollow bridge piers.