预制UHPC叠合承压板设计与受力性能分析  

Design and Mechanical Performance Analysis of Prefabricated UHPC Composite Compression Plates

作　　者：秦志清 卢才金 林镇 黄卿维[2] QIN Zhi-qing;LU Cai-jin;LIN Zhen;HUANG Qing-wei(Fujian Transportation Planning and Design Institute Co.Ltd.,Fuzhou 350004,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福建省交通规划设计院有限公司,福州市350004 [2]福州大学土木工程学院,福州市350108

出　　处：《公路》2025年第2期355-365,共11页Highway

基　　金：国家自然科学基金资助项目,项目编号51878178;福建省交通运输科技项目,项目编号202015。

摘　　要：为探讨预制超高性能混凝土(Ultra-high Performance Concrete, UHPC)叠合承压板基本力学性能,开展了UHPC承压板足尺模型试验、数值分析和优化设计。结果表明,UHPC承压板受力全过程分为弹性阶段、弹塑性阶段和破坏阶段,最终因受压区UHPC被压溃而破坏,其破坏模式和裂缝分布与传统RC承压板基本相似,但因UHPC具有较高的抗拉/抗压性能,可有效抑制裂缝的扩展,并显著提升结构承载力;经模型试验验证,基于ABAQUS软件提出的有限元建模方法可较好地模拟UHPC承压板的受力全过程与极限承载力,随着钢筋直径和UHPC抗拉/抗压强度的增大,UHPC承压板极限承载力随之提高,但荷载~位移和钢筋荷载~应变曲线弹性段斜率基本保持不变;在满足结构受力要求的前提下,通过削减叠合承压板数量可进一步减轻自重,优化设计后的UHPC承压板重量较传统RC承压板可降低26.0%,全寿命周期成本可减小7.2%,使用年限可提高1倍。Full-scale model tests,numerical analyses,and optimization designs are conducted to investigate the fundamental mechanical properties of Ultra-high Performance Concrete(UHPC)compression plates.The results indicate that the stress-strain behavior of UHPC compression plates can be categorized into three stages:elastic,elasto-plastic,and failure.Ultimately,failure occurs due to the crushing of UHPC in the compressed places.The failure mode and crack distribution are similar to traditional reinforced concrete compression plates.Due to the high tensile/compressive strength of UHPC,it can effectively suppress crack propagation and significantly enhance the structural load-carrying capacity.The model tests validate that the finite element modeling method proposed based on the ABAQUS software can accurately simulate the complete stress-strain process and ultimate load-carrying capacity of UHPC compression plates.With an increase in the diameter of the reinforcing bars and the tensile/compressive strength of UHPC,the ultimate load-carrying capacity of UHPC compression plates also increases.However,the slope of the loaddisplacement and stress-strain curves remains relatively constant in the elastic range.By reducing the number of overlaid compression plates while meeting the structural strength requirements,the self-weight of the optimized UHPC compression plates is reduced by 26.0% compared to traditional reinforced concrete compression plates.This optimization design also results in a 7.2% reduction in life-cycle costs and a doubling of the service life,demonstrating its significant feasibility for engineering applications.

关 键 词：道路工程 UHPC叠合承压板 优化设计 足尺模型试验 数值分析 受力性能 

分 类 号：U417.1[交通运输工程—道路与铁道工程] TU37[建筑科学—结构工程]