赵兴雅¹，朱世峰¹，徐  勇²
    (1 中铁大桥局集团武汉桥梁科学研究院有限公司，武汉430034; 2 西南交通大学土木工程学院，成都630034)

[摘要] 钢筋混凝土构件一般均为带裂缝工作，当其出现宏观裂纹后，随着荷载的增加，裂纹迅速发展，导致构件力学性能逐渐恶化并最终破坏。根据钢、混凝土的各自优点，提出了在混凝土结构的受拉侧局部设置增强钢板的构想。并依据重庆万盛藻渡大桥主拱拱脚区段受力特点对此种结构进行了试验研究。结果表明，混凝土结构的受力性能得到了明显改善，具有了良好的延性，且有方便施工、经济省材等优点。
[关键词] 局部增强；钢-混凝土组合结构；受力性能；试验研究

    Experimental research on local strengthening of steel-concrete composite structure
    Zhao Xingya¹, Zhu Shifeng¹, Xu Yong ²
  (1 Bridge Science Research Institute, China Zhongtie Major Bridge Engineering Group, Wuhan 430034, China; 2 School of Civil Engineering, Southwest Jiaotong University, Chengdu 400074, China)

Abstract: The reinforced concrete member is always working with cracks, which developing rapidly with the increased external load, and then failure at last. According to the individual advantages of the steel and the concrete, a new conception was proposed that the enhancing steel plate was locally set at the tensile side of the concrete structure. An experimental scheme was given based on the skewback stress characteristics of the Zaodu Arch Bridge in Wansheng of Chongqing. The results show that the mechanical behavior is improved and the structure owns other characteristics such as good tensility, convenience, economy and so on.
Keywords: local strengthen; steel-concrete composite structure; mechanical behavior; experimental research