Splitting limit behavior analysis and model test of subtubecabletopylon anchorage zone(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年06期
- Page:
- 127-134
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Splitting limit behavior analysis and model test of subtubecabletopylon anchorage zone
- Author(s):
- TANG Yingying1; 2; LI Yingshuai1; NIU Yanwei1; HUANG Pingming1
- (1. School of Highway, Changan University, Xian 710064, Shaanxi, China;2. School of Science, Changan University, Xian 710064, Shaanxi, China)
- Keywords:
- bridge engineering; splitting; model test; anchorage zone; subtube saddle
- PACS:
- -
- DOI:
- -
- Abstract:
- Amid at the stress analysis problem in the anchorage zone of an extradosed cablestayed bridge with saddle anchorage. The subtube saddle type cabletopylon anchorage zone in the Nanpanjiang Bridge (108 m+180 m+108 m threespan extradosed cablestayed bridge) was chosen to study the stress distribution and mechanism under the saddle. Firstly, the pressure distribution and friction of cable applied on the saddlewas comprehensive considered， to deduce the formula of cable pressure along longitudinal direction. Then, the ABAQUS solid element model with formula press distribution was developed to analyze the spatial stress distribution. At the end, the fullscale model test was conducted using selfbalanced reaction beam loading method, and the cable force was applied through four level steps, the maximum tension was 1.09 times the design value, and the stress characteristics of concrete under anchorage were observed and verified. The results show that the variation of concrete pressure under the saddle had little effect with the friction and kept uniform distribution along longitudinal direction, and the concrete compression and tension stress in the saddle anchorage zone are less than the specification limit and in the safe working state. Under design loading, the largest splitting stress located at the middle part concrete of two subtube anchorage, but the stress level is relatively small, and outer side of two anchorage and the concrete connected to the anchorage also appeared small splitting stress. The concrete splitting stress under the anchorage bottom decreased rapidly along vertical direction, and the superimposed effect of splitting stress along vertical direction is indistinctive; the finite element model show when cable force reached 25 100 kN, the anchorage concrete reach splitting limit stress and begin to crack. On transversal direction, vertical compression stress decrease from core zone to two outer side, approximately showing parabolic distribution. The finite element model stress distribution results is consistent with model test results and has reliability. 1 tab, 14 figs, 23 refs.
Last Update: 2018-12-18