期刊论文

中文

桥梁建设

1003-4722

2017

47

4

66-71

10.3969/j.issn.1003-4722.2017.04.012

国家重点基础研究发展计划（973计划）项目（2015CB057706） 国家自然科学基金项目（51108046,51678068） 湖南省自然科学基金项目（2017JJ5029）

本校为第一机构

为了解竖向接缝对预应力混凝土箱梁桥抗剪性能的不利影响及改进措施,以七里坪湘江大桥预应力混凝土梁为原型,设计制作4片预应力混凝土模型梁进行跨中单点加载试验,分析各模型梁在试验过程中的裂缝发展情况、破坏形态和抗剪承载力,研究交界面粗糙度和普通钢筋配筋率对抗剪性能的影响。结果表明:各模型梁的裂缝发展过程基本相似,破坏形态均为弯剪破坏;带竖向接缝梁的抗裂性能比整体浇筑梁差,但各梁的抗剪承载力相差不大;带竖向接缝梁的刚度低于整体浇筑梁的刚度;增加接缝处混凝土交界面粗糙度和普通钢筋配筋率可以提高带竖向接缝梁的抗裂性能和刚度。

To investigate the adverse influences of the vertical joints on the shear behavior of prestressed concrete (PC) box girder and the related improvement measures against the influences, the PC box girder of the Qiliping Xiangjiang River Bridge was taken as the prototype, 4 model PC box beams were designed, prepared and the tests of the single point loading at the midspans of the beams were made. The crack propagation, failure modes and shear bearing capacity of the model beams in the tests were analyzed and the influences of the concrete interfac...