土工基础

›› 2016, Vol. 30 ›› Issue (2): 274-280.

• 工程实录 • 上一篇    

薄壁U型钢-混凝土组合梁抗剪性能的试验研究

赵庆龙1，王 伟1，沈建华2   

  1. (1.中国电力工程顾问集团中南电力设计院有限公司，武汉 430071;2.中国科学院武汉岩土力学研究所，武汉 430071）
  • 收稿日期:2016-02-25 出版日期:2016-04-20 发布日期:2016-04-27
  • 作者简介:赵庆龙(1981-)，男，高级工程师，研究方向为岩土工程及水文地质。

Experimental Study on the Shear Behavior of the U-section Thin-walled Steel-Concrete Composite Beams

ZHAO Qinglong1, WANG Wei1, SHEN Jianhua2   

  1. (1.Central Southern China Electrical Project Power Design Institute, Wuhan, 430071；
    2.Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071)
  • Received:2016-02-25 Online:2016-04-20 Published:2016-04-27

摘要： 钢与混凝土组合梁因承载力高等特性在工程中得到了广泛的应用，薄壁U钢-混凝土梁正是其中一种特殊构件。为综合分析不同条件下薄壁U型钢的剪切性能、屈曲破坏模态等，观察梁随着荷载的施加受力的传递过程及破坏特征，进行了8根简支组合梁的抗剪性能的试验研究。结果表明，相对于普通混凝土组合梁及纯钢梁，薄壁U钢-混凝土梁剪切破坏有较好的延性，钢梁腹板因内填混凝土屈曲模态由三个屈曲半波变成一个屈曲半波，承载力得到大幅度提高；与普通钢-混凝土组合梁相比，薄壁U型钢-混凝土组合梁在剪跨比小于2时即会发生弯曲破坏。

关键词: 薄壁U型钢-混凝土简支组合梁, 抗剪性能, 屈曲模态

Abstract: Comparative studies were performed to analyze the mechanical properties, flexural failure modes, distribution of the load-displacement and cross sectional stress of the mid-span as well as the changes of the shear stress-strain of the composite beams. A total of eight (8) U-section thin-walled steel-concrete composite beams were tested for the shear resistance behavior. The results indicates that, compared with the steel beams and the other concretesteel composite beams, a better ductility can be found in the U-section thin-walled steel-concrete composite beams under the shear failure mode. Since it is filled with the concrete in the web, the beam web's buckling mode changes from the three half-buckling wave to one half-buckling wave, the load carrying capacity of the composite bean was improved significantly compared with the steel beam. The flexural failure of the U-section thin-walled steel-concrete composite beam occurred when the shear span ratio is less than 2. At the flexure failure, the shear span ratio of U-section composite beam is less than that of the conventional steel-concrete composite beam.

Key words: U-section Thin-walled Steel-Concrete Composite Beam, Shear Behavior, Failure Modes, Experimental Studies