采用超高性能混凝土的桥梁承台抗冲切性能数值分析  

Numerical Analysis of Punching Shear Resistance of Bridge Cap with UHPC

作　　者：黄开青 HUANG Kaiqing(Fujian Provincial Fuquan Expressway Co.,Ltd.,Fuzhou 350011)

机构地区：[1]福建省福泉高速公路有限公司,福建福州350011

出　　处：《福建建筑》2025年第2期93-99,共7页Fujian Architecture & Construction

基　　金：福建省科技计划项目-高校产学合作项目(2021H6021)。

摘　　要：研究采用通用有限元软件ABAQUS,建立了局部桩基承台节点精细化实体有限元模型,以桥梁承台的材料和厚度为研究参数,对超高性能混凝土(UHPC)承台和普通混凝土(RC)承台的抗冲切性能进行了对比分析。结果表明:UHPC承台的冲切破坏为脆性破坏,其受力过程可划分为弹性、弹塑性、强化和破坏四个阶段;UHPC承台的抗冲切承载力与承台厚度基本呈线性相关。相较于RC承台,UHPC承台的厚度,可由规范要求的1.5倍桩径优化至1.05倍桩径,可在满足承载要求的同时,最大程度减轻桥梁承台自重。This study establishes a refined solid finite element model of local pile cap nodes using the general finite element software ABAQUS.The material and thickness of bridge pile caps are taken as research parameters,and a comparative analysis of the anti-impact and shear performance of Ultra-High Performance Concrete(UHPC)pile caps and Reinforced Concrete(RC)pile caps is conducted.The results indicate that the failure mode of UHPC pile caps is brittle,and its stress process can be divided into four stages:elastic,elastoplastic,strengthening,and failure.The anti-impact and shear capacity of UHPC pile caps is basically linearly correlated with the thickness of the pile cap.Compared to RC pile caps,the thickness of UHPC pile caps can be optimized from 1.5 times the required pile diameter stipulated by regulations to 1.05 times the pile diameter,which can effectively reduce the self-weight of bridge pile caps while meeting the load requirements to the maximum extent.

关 键 词：桥梁承台 冲切破坏 UHPC 有限元分析 抗冲切性能 

分 类 号：U44[建筑科学—桥梁与隧道工程]