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
Civil Engineering Construction Quality and Safety Control Laboratory of Hunan University of Science and Technology,Xiangtan 411201, China; Civil Engineering Testing Center of Hunan City University, Yiyang 413000,China
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.
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]. , 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. , 2011, 30(12): 201-204,.
2011, Vol. 30 
