轻型预应力UHPC锚固局压区设计优化与承载能力研究

韩婷婷; 黄家兴; 胡玉庆

文章摘要

韩婷婷,黄家兴,胡玉庆.轻型预应力UHPC锚固局压区设计优化与承载能力研究[J].安徽建筑大学学报,2025,33(4):22-32

轻型预应力UHPC锚固局压区设计优化与承载能力研究

Optimization of the Design and Bearing Capacity of the Local Compressive Zone in Lightweight PrestressedUHPC Anchorage

DOI：

中文关键词: UHPC 锚固局压区轻型承压机理参数研究承载能力

英文关键词: UHPC local anchorage compressive zone lightweight bearing mechanism parametric study load-bearing capacity

基金项目:国家自然科学基金项目（52308129）；安徽省自然科学基金青年项目（2308085QE185）；安徽省BIM工程中心主任基金项目（AHBIM2023ZR01）

作者	单位
韩婷婷	School of Civil Engineering, Anhui Jianzhu University，Hefei 230601，China；BIM Engineering Center of Anhui Province，Hefei 230601，China）
黄家兴	School of civil engineering，Anhui Jianzhu University，Hefei 230601，China
胡玉庆	School of civil engineering，Anhui Jianzhu University，Hefei 230601，China

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中文摘要:

预应力桥梁结构中锚固局压区的受压能力直接关系到预应力结构的体系可靠性与施工安全性。基于力流模型分析锚固局压区的局部承压机理，阐明锚垫板和螺旋钢筋在局部承压中的作用。然后针对预应力UHPC桥梁结构轻量化与薄壁化的特点，简化传统的锚固局压区，提出去锚垫板和附加钢筋的轻型UHPC锚固局压区体系。为验证其可靠性，建立了7根和12根钢绞线锚固的轻型UHPC锚固局压区试件的有限元模型，通过非线性数值试验证明其局压承载能力是设计所需承载能力的2倍以上。为优化锚固局压区设计参数，分析了螺旋筋约束直径、高度、螺距和钢筋直径、UHPC强度、锚板尺寸和UHPC保护层厚度等参数对承载能力的影响，确定了最优UHPC轻型锚固局压区的设计参数，并确定了适用的锚固局压区承载能力计算公式。

英文摘要:

The compressive capacity of the local anchorage compressive zone in prestressed bridge structures is critical to its reliability and construction safety. This paper firstly analyzes the local compressive mechanism of the anchorage compressive zone based on the force flow model, elucidating the role of the anchorage plate and spiral steel bars in local compression. Subsequently, considering the lightweight and thin-walled characteristics of prestressed UHPC bridge structures, the traditional anchorage compressive zone is simplified. A lightweight UHPC anchorage compressive zone system is proposed, which eliminates the anchorage plate and additional reinforcement. To verify the reliability of the proposed zone, finite element models of test specimens with 7 and 12 strands of steel tendons anchored in the lightweight UHPC compressive zone were established. Nonlinear numerical simulations prove that the local compressive bearing capacity is more than twice the required design capacity. To optimize the design parameters of the proposed zone, the effects of various parameters, such as the spiral reinforcement confinement diameter, height, pitch and bar diameter, UHPC strength, anchor plate size, and UHPC protective layer thickness on the bearing capacity were analyzed, and applicable formulas for calculating the compressive capacity of the proposed lightweight UHPC are determined.

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