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Analysis of failure patterns of doublecolumn bridgepiers subjected to vessel collision(PDF)

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

Issue:
2018年06期
Page:
146-154
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Analysis of failure patterns of doublecolumn bridgepiers subjected to vessel collision
Author(s):
ZHANG Jingfeng1;  ZHAN Gangyi2;  JING Yuan1;  LI Xiaozhen3
(1. School of Highway, Changan University, Xian 710064, Shaanxi, China; 2. Nanchang Railway Survey andDesign Institute Co Ltd., Nanchang 330002, Jiangxi, China; 3. School of Civil Engineering,Southwest Jiaotong University, Chengdu 610031, Sichuan, China）
Keywords:
bridge engineering;  vesselbridge collision;  doublecolumn bridge pier;  failure pattern;  reinforced concrete (RC);  numerical simulation
PACS:
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DOI:
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Abstract:
To investigate the damage and failure mechanisms of bridge doublecolumn piers subjected to vessel collision, the material constitutive models of the reinforced concrete (RC) structure and the modeling approach of bond effects were discussed. The concrete material in RC piers was simulated with a concrete continuoussmoothcapmodel (CSCM), and the longitudinal reinforcement and stirrup were modeled with a kinematic hardening plastic model, including the strainrate effect. The explicit dynamic finite element software LSDYNA was employed to conduct the numerical simulation of barge doublecolumn pier collision, considering the influences of longitudinal reinforcement ratio and soilpile interaction. The results show that the failure process of the doublecolumn could be classified into 4 stages， initial contact and collision, collided column failure, noncollided column failure, and joint between tie beam and column failure stage，under the vessel impact loading . The contacted area of the pier suffered the first local damage. Then, both the collided and noncollided pier columns, as well as the tie beam joints is damaged by a rupturefailure pattern. The barge bow endured the loadingunloading process twice. Around 76% of the vessel kinetic energy is transformed into the internal energy of the barge bow and structure during the collision process. The ratio of longitudinal reinforcement affects the failure patterns of the bridge pier significantly. The damage pattern of the bridge pier transferred from the flexural failure to a few transverse cracks as the reinforcement ratio increases. No flexural failure occurred as the reinforcement ratio is reach to 2%, whereas the joint between the contacted column and tie beam suffered severe rupture failure under various reinforcement ratios. The soilpile interaction has a significant influence on the failure pattern of bridge pier, which should be considered in the structural design. Shear failure occurs as the pier bottom is fixed rigidly. 2 tabs, 11 figs, 25 refs.

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Last Update: 2018-12-18