Model Test of Large Beam-Type Pile Cap and Simplified Method to Calculate Midspan Deflection

被引：0
|
作者：
Wang J. [1 ]
Huang Y. [1 ]
Hu Z. [2 ]
Li Y. [3 ]
机构：
[1] Yellow River Engineering Consulting Co., Ltd., Zhengzhou
[2] School of Transportation, Wuhan University of Technology, Wuhan
[3] CCCC Second Highway Survey and - Design Institute Co., Wuhan
来源：
Bridge Construction | 2024年 / 54卷 / 01期
关键词：
beam-type pile cap; calculation method; finite element method; mechanical property; midspan deflection; model test; shearing effect;
D O I：
10.20051/j.issn.1003-4722.2024.01.019
中图分类号：
学科分类号：
摘要：
In the reconstruction project of a corridor, large beam-type pile caps are applied. This study investigates the mechanical property of this type of pile caps under varying beam depth to span ratios. 1 : 10 scale-down models were prepared, accompanied with finite element simulation, to analyze the load bearing behavior, failure mode and cracking of the pile caps. The result indicates that when loaded at midspan, the beam-type pile cap sequentially undergoes a linear elastic stage, a crack propagation stage and a yielding stage. In the linear elastic stage, the cross-sectional stress distribution does not comply with a plan assumption, and the influence of shearing effect on the structural deformation should not be neglected. The model finally succumbed to bending failure. The dominant cracks are the bending and oblique cracks at midspan. The smaller the span to beam depth ratio, the greater the shear stiffness of the beam-type pile cap. To examine the influence of shear effect on the deformation of beam-type pile cap, a simplified method to calculate the midspan deflection of the beam-type pile cap is proposed, and the values calculated by the method are compared with the code and test values. It is shown that in the crack propagation stage, there is a big difference between the code and test values, but small difference between the values gained by the proposed method and test values. The method can be used to initially predict the midspan deflection of the beam-type pile cap in the linear elastic and crack propagation stages. © 2024 Wuhan Bridge Media Co., Ltd., MBEC. All rights reserved.
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页码：133 / 139
页数：6
相关论文
共 17 条
  • [1] LAN Xiangang, Design Study on Urban Viaduct Bridge across Metro Station Using Large-Span Platform Beam[j], Railway Engineering, 57, 4, pp. 30-33, (2017)
  • [2] LEI Jie, CHEN Zixia, SHI Ke, Shear Behavior and Bearing Capacity Calculation of Steel Fiber Reinforced High Strength Concrete Two-Pile Caps, Journal of Building Structures, 44, 9, pp. 234-245, (2023)
  • [3] ABDULLAHI Y M., Analytical Investigation on Shear Performance of FRP-Reinforced Concrete Deep Beams, (2020)
  • [4] CHEN Hui, YI Weijian, Evaluation and Modification of Strut-and-Tie Model for Simply-Supported and Continuous Deep Reinforced Concrete Beams without Stirrups, Journal of Building Structures, 40, 7, pp. 154-161, (2019)
  • [5] XU Dongmei, Stress Performance and Thermal Effect Analysis on Short Beam, (2011)
  • [6] XU L H, CHI Y, XIA D T., Flexural Behavior of Hybrid Fiber Reinforced High Performance Concrete Deep Beam, Journal of Civil Engineering and Architecture, 3, pp. 39-47, (2009)
  • [7] WANG Min, GAO Liqiang, WANG Kangning, Et al., Experimental Study on Flexural Behavior and Bearing Capacity of UHPC Beams Reinforced with High-Strength Steel Bars, Bridge Construction, 52, 6, pp. 87-94, (2022)
  • [8] ZHANG Long, TANG Xibiao, Model Tests for Ultimate Bending-Resistant Capacity of Prestressed Beam with External Prestressing Tendons and Glued Joints, World Bridges, 48, 3, pp. 63-68, (2020)
  • [9] ZHANG Honglei, PAN Yong, YUAN Weiwei, Et al., Research on Shear Behavior of Prestressed Hollow Core Beam Bridge Strengthened by Cavity Fill Technique [ J ], World Bridges, 50, 6, pp. 109-115, (2022)
  • [10] ZHANG Long, ZHANG Jiafeng, SUN Ya, Research on the Shear Bearing Capacity of the Prefabricated Pile Caps Joint Surface, Building Structure, 52, pp. 1829-1833, (2022)
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