钢-混组合加固梁承载能力试验研究
CSTR:
作者:
作者单位:

1.浙江大学;2.华汇工程设计集团股份有限公司;3.绍兴市基础设施建设投资有限公司

中图分类号:

U448

基金项目:

浙江省建设科研项目(2019K181)


Experimental Study on the Load-bearing Capacity of Steel-concrete Composite Strengthening Beam
Author:
Affiliation:

1.zhejiang university;2.huahui group;3.Shaoxing Infrastructure Construction Investment Company Limited

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    摘要:

    针对外包钢板的钢-混组合结构加固方法中结合面传力机理以及植筋、剪力钉数量对结构承载能力影响问题,开展了6组植筋、剪力钉布置不同的钢板-混凝土组合加固梁弯曲试验,比较了植筋、剪力钉布置间距对构件的力学行为和承载能力的影响;根据试验数据以及构件的破坏形态分析了钢-混结合面的工作机理和破坏机理。试验结果表明:相对于加固结构刚度较大的外包钢板加固法,利用刚度较大的外包钢板对结构进行加固,对结合面的强度要求高,通过灌浆料连接植筋、剪力钉的方式很难满足钢-混结构变形一致的要求,在一定范围内增减剪力钉数量对加固结构的刚度和极限承载力基本没有影响,但可以防止钢板早期发生局部失稳,发挥外包钢板的刚度和承载能力的作用。

    Abstract:

    This paper presents an experimental investigation on the load transition mechanism of the joint surface , and the effects of shearing stud and bar-planted placements on structural capacity for the steel-concrete composite strengthening structure with coated steel plate. 6 groups of steel-concrete composite specimens with various deployments of shearing stud and bar-planted are carried out. The influences of the arrangement interval of shearing stud and bar-planted on the mechanic behavior and load-bearing capacity are compared; the working and damage behavior of the steel-concrete composite joint surface are studied based on the experimental data and failure modes. Results showed that Compared with the steel-enveloped approach with greater rigidity of the reinforced structure, the structure is reinforced by the enveloped steel plate with greater rigidity, and the strength of the joint surface is higher.The grouting-connected pattern of bar-planted and shearing stud cannot satisfy the correspondence deflection requirement of enveloped steel plates and inner-concrete cores due to the stricter strength requirement of the joint surface . Although the changes on number of shearing stud nearly have no effect on the structural stiffness and the ultimate capacity of the enforced components for a certain range, the premature local instability of enveloped steel plates is prevented, by which the plasticity and ductility can be fully utilized.

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  • 收稿日期:2021-01-23
  • 最后修改日期:2021-03-25
  • 录用日期:2021-04-27
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