预应力钢棒加固T梁桥横隔板试验研究
Experimental Study of T-type Beam Bridge Transverse Diaphragm Reinforcement by Prestressed Steel Bar
Received: August 26, 2016  Revised: October 11, 2016
DOI:10.7520/1001-4888-16-157
中文关键词:  T梁桥  横隔板  预应力钢棒  横向分布系数  加固
英文关键词:T-type beam bridge  transverse diaphragm  prestressed steel bar  transverse distribution coefficient  reinforcement
基金项目:湖南省交通科技项目(201434)
Author NameAffiliation
DENG Ming* 1.School of Civil Engineering & Architecture, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 2.Transportation Research Institute of Tianjin, Tianjin 300074, China 
ZHANG Jian-ren School of Civil Engineering & Architecture, Changsha University of Science & Technology, Changsha 410114, Hunan, China 
WANG Lei School of Civil Engineering & Architecture, Changsha University of Science & Technology, Changsha 410114, Hunan, China 
HE Li-zhong Transportation Research Institute of Tianjin, Tianjin 300074, China 
DAI Li-zhao School of Civil Engineering & Architecture, Changsha University of Science & Technology, Changsha 410114, Hunan, China 
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中文摘要:
      针对T梁桥横隔板开裂、破损的问题,采用预应力钢棒对T梁横隔板进行加固。本文根据T梁桥的结构特点,提出了预应力钢棒的张拉位置及张拉力大小的确定原则,对横隔板的受力进行了分析。加固过程对横隔板裂缝宽度、张拉力进行了监测;对加固前后相同位置的受力情况进行了对比分析。结果表明:预应力钢棒加固T梁后,横隔板储备的压应力可以抵消活载产生的拉应力,横隔板裂缝宽度大大减小,且在荷载作用下裂缝不再扩展;桥梁横向分布性能大大改善,主梁挠度最大可以减少20%以上。采用预应力钢棒加固T梁横隔板效果良好。
英文摘要:
      In order to solve the problem of T beam transverse diaphragm cracking and damage, the T beam transverse diaphragm is reinforced by prestressed steel bar. In this paper, according to the structural characteristics of T beam bridge, determination principle of the tension position and the tensile force size of prestressed steel bar are put forward, then, force analysis of transverse diaphragm is carried out. During the process of reinforcement, the crack width and tensile force size of transverse diaphragm were monitored, and the stress at the same position before and after reinforcement was comparatively analyzed. Results show after the reinforcement of T beam bridge by prestressed steel bar, the residual compressive stress in transverse diaphragm can cancel the tensile stress produced by live load, the crack width of transverse diaphragm is greatly reduced, and the crack no longer propagates under the loading action. The lateral distribution of bridge is greatly improved, and the deflection of main beam reduces more than 20%. So, the effect of T beam transverse diaphragm by prestressed steel bar is good.
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