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钢管混凝土桁式弦杆组合连续梁抗弯性能

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为研究钢管混凝土桁式弦杆组合连续梁的抗弯性能和计算方法，开展了模型试验和理论分析，研究钢管混凝土桁式弦杆组合连续梁正、负弯矩区的应变分布、变形特性、破坏形态和抗弯承载能力，并对正、负弯矩区的抗弯承载能力计算方法进行讨论。结果表明:钢管混凝土桁式弦杆组合连续梁正、负弯矩区的腹杆和节点均具有较高的强度和刚度，能够保证节点破坏不会先于截面整体破坏。截面应变沿高度方向基本呈线性变化，满足平截面假定。正、负弯矩区的抗弯承载能力破坏形态分别是弦杆钢管全截面屈服和混凝土桥面板内部钢筋发生屈服。腹杆对钢管混凝土桁式弦杆组合连续梁正、负弯矩区抗弯承载能力的贡献度分别为12。5%和8。6%。本文提出了考虑腹杆贡献的钢管混凝土桁式弦杆组合连续梁抗弯承载能力的计算方法，其计算结果与试验和有限元分析结果进行对比分析，误差不超过8。1%。
Flexural behavior of composite continuous girders with concrete-filled steel tubular truss chords
To study the flexural behavior and the calculation method of composite continuous girders with concrete-filled steel tubular(CFST)truss chords,model tests and theoretical analysis were carried out.The strain distribution,deformation property,failure mode,flexural bearing capacity of both the positive and negative bending moment area of composite continuous girders with CFST truss chords were studied.The calculation method for the flexural bearing capacity for both the positive and negative bending moment area was also discussed.The brace and the joint in the positive and negative bending moment area of composite continuous girders with CFST truss chords has higher strength and stiffness,and it can make sure that the failure of the joint is not prior to that of the whole section.The strain changes linearly along the depth direction of the cross section,and it meets the plane-section assumption.The flexural bearing capacity failure mode of the positive and negative bending moment area are that the full cross section of the chord and the rebar used in the concrete bridge deck slab yield,respectively.The contributions of the web members to the flexural bearing capacity in the positive and negative bending moment area of composite continuous girders with CFST truss chords are 12.5%and 8.6%,respectively.The calculation method considering the contributions of the web members to the flexural bearing capacity for composite continuous girders with CFST truss chords is put forward.The deviation between the result acquired by the calculation method for the flexural bearing capacity above and that acquired by the test and finite element analysis is less than 8.1%.

bridge engineeringcomposite continuous girdersconcrete-filled steel tubular truss chordsflexural behaviormodel testtheoretical analysiscalculation method

黄汉辉、陈康明、吴庆雄

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福建船政交通职业学院 土木工程学院,福州 350007

福州大学 土木工程学院,福州 350116

桥梁工程 组合连续梁 钢管混凝土桁式弦杆 抗弯性能 模型试验 理论分析 计算方法

国家重点研发计划项目国家自然科学基金项目

2017YFE013030052078137

2024

10.13229/j.cnki.jdxbgxb.20221039

吉林大学学报(工学版)
吉林大学

吉林大学学报(工学版)

CSTPCD北大核心
影响因子：0.792
ISSN：1671-5497
年,卷(期)：2024.54(6)
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