PC箱梁桥腹板竖向预应力筋外露段频率特性的实验研究

杨 滔;;钟新谷;沈明燕

振动与冲击 ›› 2011, Vol. 30 ›› Issue (12) : 201-204,.

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (12) : 201-204,.
论文

PC箱梁桥腹板竖向预应力筋外露段频率特性的实验研究

  • 杨 滔 1,2 ; 钟新谷1; 沈明燕1
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Experiment study on frequency properties of uncased part of vertical tendon in webs of prestressed concrete box girder bridges


  • Yang Tao; Zhong Xin-gu; Shen Ming-yan
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摘要

以解决目前普遍存在的大跨度预应力混凝土箱梁桥腹板竖向应力失效问题为目的,在室内建造混凝土箱梁腹板模型,完全按照现场方法安装和张拉竖向预应力筋,运用单点脉冲冲击法,基于在预应力筋外露端安置传感器所拾取的振动信号,对锚固系统外露端频率特性进行了研究,提出竖向预应力筋外露段的固结变刚度的悬臂梁模型,并对模型的螺母锚固区刚度进行了识别,为竖向预应力筋张拉力测试提供了理论依据。

Abstract

In order to solve a widespread problem that the vertical prestress applied widely in the webs of large-span concrete box girder bridges loses efficacy seriously, authors built concert box girder web-models in lab and installed vertical prestressing anchor system as field do. On the basis of the lateral vibration signals when an acceleration sensor was fixed at the tip of the uncased part of vertical tendon, we applied single-pulse-impact method to study the frequency properties of the uncased part of vertical prestressing anchor system in this paper, which proposed a model that takes the uncased part of the bar as a cantilever with fixed end and variational flexural rigidity, and then identified the flexural rigidity of anchorage zone stiffened by nut at uncased part of the bar, moreover, provided theoretical basis for testing effective tension retained in the vertical tendon.

关键词

预应力混凝土箱梁桥 / 竖向预应力筋 / 张拉力测试

Key words

prestressed concrete box girder bridge / vertical tendon / tension test.

引用本文

导出引用
杨 滔;;钟新谷;沈明燕 . PC箱梁桥腹板竖向预应力筋外露段频率特性的实验研究[J]. 振动与冲击, 2011, 30(12): 201-204,
Yang Tao;Zhong Xin-gu;Shen Ming-yan. Experiment study on frequency properties of uncased part of vertical tendon in webs of prestressed concrete box girder bridges[J]. Journal of Vibration and Shock, 2011, 30(12): 201-204,

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