|Table of Contents|

Joint rotation model of unbonded posttensioned precast bridge column based on quasi-static cyclic tests(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年6期
Page:
110-120
Research Field:
桥梁工程·交通基础设施智能化运维技术专栏
Publishing date:

Info

Title:
Joint rotation model of unbonded posttensioned precast bridge column based on quasi-static cyclic tests
Author(s):
ZHU Zhao1; 2;  LI Yuan1; 2;  ZHOU Mi1; 2;  HE Shuan-hai1; 2
(1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation, Chang’an University,Xi’an 710064, Shaanxi, China)
Keywords:
bridge engineering;  quasi-static cyclic test;  fiber-element analysis;  precast bridge column;  rotational joint model
PACS:
U443.22
DOI:
10.19721/j.cnki.1671-8879.2022.06.011
Abstract:
To study the seismic performance of precast post-tensioned column(PPTC), quasi-static cyclic tests of cast-in-place(CIP)column and PPTC were conducted. Based on the deformation modes and hysteretic curves, seismic performance analysis of three joint rotation model columns was carried out. With the software OpenSees, the free expansion of unbonded tendons and elastic rotational deformation characteristics of joints were considered. The results show that the deformation mode of the PPTC is mainly controlled by rocking characteristics in joints during cyclic tests. With the displacement increasing, the failure modes are dominated by excessive joint openings and serious decrease of the compression areas. When the horizontal coordinated deformation of prestress is not considered, the calculated value of prestress internal force is too small and the calculated value of joint opening is too large, because it is difficult to include the prestress elongation caused by the overall bending of the column shaft and joint rotation, resulting in low initial stiffness of the column and early degradation of the bearing capacity. Considering the coordinated deformation, the column indicates reduced joint openings and larger prestress forces. However, due to the ignored vertical stiffness supplied by tendons, the calculated values are still larger than the test values. With the free rotational elements, coordinated horizontal deformations and the vertical stiffness using in numerical models, the proposed joint openings, prestress forces and the seismic parameters can be effectively calculated. The method of joint model establishment can be used as a reference for seismic performance research of ‘rocking characteristic’ columns, in order to promote the progress of engineering application of such columns in seismic regions.1 tab, 14 figs, 22 refs.

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Last Update: 2022-12-20