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赵帅磊，陈光海，韩雨生

 

 

（中交路桥建设有限公司，北京 100027）

摘要：针对钢-混叠合连续梁桥的负弯矩区容易出现裂缝的问题，以石清路桥钢-混凝土叠合连续梁桥为工程背景，采用有限元软件建立负弯矩区节段模型，用超高性能混凝土(UHPC)代替部分普通混凝土(NC)形成UHPC-NC叠合钢梁，对比分析混凝土类型对叠合钢梁的上表面拉应力以及连接件拉应力的影响，利用正交分析UHPC强度、顶板厚度及宽度对顶板上表面、连接件最大拉应力的影响程度。结果表明:UHPC-NC叠合顶板相较于钢-混顶板，上表面最大拉应力、连接件拉应力分别降低了11.2%、10.1%，UHPC-NC叠合顶板的刚度更强，掺入的钢纤维提高了整体抗变形能力；对上表面最大拉应力影响程度排序为UHPC混凝土强度、顶板厚度、顶板宽度；对连接件拉应力影响程度排序为顶板厚度、UHPC混凝土强度、顶板宽度，优化方案的上表面最大拉应力、连接件拉应力相较于原方案分别降低了4.1%、3.0%。研究结果为UHPC-NC叠合钢梁设计和实际工程应用提供理论支撑。

关键词：UHPC-NC叠合钢梁；负弯矩区；正交分析

中图分类号：U448.38

文献标志码：A

文章编号：1005-8249（2025）06-0123-05

DOI：10.19860/j.cnki.issn1005-8249.2025-06-021

 

 

ZHAO Shuailei,CHEN Guanghai,HAN Yusheng

 

 

(Road & Bridge International Co.,Ltd.,Beijing 100027,China）

 

Abstract：This study addresses the problem of crack formation in the negative moment regions of steel-concrete composite continuous beam bridges,using the Shiqing Road Bridge as a case study.A segment model of the negative moment zone was established using Finite element software,wherein ultra-high performance concrete (UHPC) partially replaces ordinary concrete (NC) to create a UHPC-NC composite steel beam.A comparative analysis was conducted to evaluate the effects of different concrete types on the tensile stresses experienced at the upper surface of the composite steel beam and in the connection components.Through orthogonal analysis,we assessed the influence of UHPC strength,top slab thickness,and width on the maximum tensile stresses at both the upper surface and connection components.The results show that the UHPC-NC composite top slab reduces the maximum tensile stress at the upper surface and in the connection components by 11.2% and 10.1%,respectively,when compared to the traditional steel-concrete top slab.The UHPC-NC composite top slab demonstrates superior stiffness,with the inclusion of steel fibers enhancing its overall resistance to deformation.The impact on maximum tensile stress at the upper surface is ranked as follows:UHPC concrete strength,top slab thickness,and top slab width.In contrast,the tensile stress in the connection components is primarily influenced by UHPC concrete strength and top slab thickness.The optimized design leads to decreases of 4.1% and 3.0% in the maximum tensile stress at the upper surface and the tensile stress in the connection components,respectively,relative to the original design.These research findings provide valuable theoretical support for the design and practical application of UHPC-NC composite steel beams.

 

Key words：UHPC-NC stacked steel beam;negative bending moment zone;orthogonal analysis

 

 

作者简介：赵帅磊（1988—），男，本科，高级工程师，研究方向：桥梁工程。

收稿日期：2024-08-12