超高性能混凝土（UHPC）简支板受弯承载力计算方法研究

肖传平; 李亚; 王平山; 李进军; 吴学淑

doi:10.3724/j.gyjzG26013003

超高性能混凝土（UHPC）简支板受弯承载力计算方法研究

doi: 10.3724/j.gyjzG26013003

肖传平¹,
李亚^1, ,,
王平山^2,3,
李进军^2,3,
吴学淑^2,3

1. 上海师范大学建筑工程学院, 上海 201418;
2. 华东建筑设计研究院有限公司, 上海 200011;
3. 上海装配式建筑技术集成工程技术研究中心, 上海 200011

基金项目:

“十四五”国家重点研发计划（2022YFC3801400）；国家土建结构预制装配化工程技术研究中心开放课题（2024CPCCE-K06）。

详细信息

作者简介:
肖传平，学士，主要从事装配式混凝土外挂墙板研究。

通讯作者:
李亚，博士，副教授，主要从事装配式混凝土结构研究，liya@shnu.edu.cn。

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出版历程
- 收稿日期: 2026-01-30
- 网络出版日期: 2026-04-11
- 刊出日期: 2026-02-20

Research on the Calculation Method for the Flexural Capacity of Ultra-High Performance Concrete Simply-Supported Slabs

XIAO Chuanping¹,
LI Ya^{1
, ,},
WANG Pingshan^2,3,
LI Jinjun^2,3,
WU Xueshu^2,3

1. School of Civil Engineering, Shanghai Normal University, Shanghai 201418, China;
2. East China Architectural Design and Research Institute Co., Ltd., Shanghai 200011, China;
3. Shanghai Engineering Research Center of Assembly Building Technology Integration, Shanghai 200011, China

摘要

摘要: 超高性能混凝土（UHPC）凭借其卓越的抗拉强度与应变硬化特征，为无配筋轻量化结构设计提供了可能。然而，现行设计规范往往低估了其受拉贡献，且传统分析方法难以准确量化不同纤维对构件抗弯承载力的复杂影响。在薄壁构件或窄截面的浇筑过程中，模具边界对纤维取向产生显著的约束作用，即“壁效应”，导致纤维分布呈现各向异性特征，进而显著影响构件的抗弯性能。为此，开展了3块无筋UHPC板的抗弯性能试验，并与前期试验展开对比，结果表明：随着截面尺寸的减小，壁效应对纤维取向的作用增强，显著提升了构件的名义抗弯强度，特别是对于窄高型截面，侧壁效应使有效抗拉强度较基体提升了30%以上。在此基础上系统研究了无配筋UHPC简支板的极限抗弯机理，通过引入等效矩形应力块模型，并针对3种不同纤维类型的UHPC简支板提出了受弯承载力计算方法。所提出的理论模型能够较好地预测不同几何尺寸下UHPC板的极限承载力。
- 超高性能混凝土（UHPC） /
- 尺寸效应 /
- 纤维取向 /
- 抗弯承载力
Abstract: Ultra-high performance concrete （UHPC）， with its exceptional tensile strength and strain-hardening characteristics， offers the possibility of designing non-reinforced lightweight structures. However， current design codes often underestimate its tensile contribution， and traditional analytical methods struggle to accurately quantify the complex influence of different fibers on the flexural capacity of members. During the casting of thin-walled elements or narrow cross-sections， the mold boundaries impose significant constraints on fiber orientation—a phenomenon known as the “wall effect”—leading to anisotropic fiber distribution and consequently a substantial impact on the flexural performance of the element. In this study， flexural performance tests were conducted on three non-reinforced UHPC slabs and compared with prior experimental results. The findings revealed that as the cross-sectional size decreased， the influence of the wall effect on fiber orientation intensified， significantly enhancing the nominal flexural strength of the element. Particularly for narrow and deep cross-sections， the side-wall effect increased the effective tensile strength by more than 30% compared to that of the matrix. Building on this， the ultimate flexural mechanism of non-reinforced UHPC simply-supported slabs was systematically investigated. By introducing an equivalent rectangular stress block model， a calculation method for the flexural capacity of UHPC simply-supported slabs with three fiber types was proposed. The theoretical model presented in this paper can effectively predict the ultimate bearing capacity of UHPC slabs across various geometric dimensions.
- ultra-high performance concrete （UHPC） /
- size effect /
- fiber orientation /
- flexural capacity

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参考文献(23)

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