INSIGHTS INTO STRENGTH OF ARC-TRANSITION REGION IN TRACKS OF HYDRAULIC STEEL GATES
A forged track with I-shape cross-section is the common form used for large-size hydraulic steel gates, in which an arc-transition region exists around the joint of flange and web. At present, only the hearing stress in the thinnest section of the neck of track is calculated to produce limit bearing criteria in track design according to SL74 -95 Hydraulic and hydroelectric engineering specification for design of steel gate. Nevertheless, it is probable that the equivalent stress in the arc-transition region is larger than that distributed at the upper edge of the effective height of web. The reason lies in that the arc- transition region is situated nearer the action spot of the wheel-pressure; moreover, it is under the status of multiaxial stresses. To clarify the possibility, a novel finite element method as well as compression stress diffusion method is proposed to perform insightful investigation on the local bearing stress in arc-transition region. The method is validated by compared to the available outcomes reported in related literatures and experiment reports. The exhaustive comparison demonstrates that the equivalent stress in the arc-transition region is essentially larger than the hearing stress in the neck of track, which verifies the above possibility and reveals a limitation on track design existing in Chinese applicable codes present. The limitation usually results in unsafe design of track. In addition, a technique to determine the location of the largest equivalent stress point in the arc- transition region is explored and the strength calculation is formulized in an explicit expression.
Strength calculation critical bearing stress equivalent stress arc-transition region steel gate tracks
R. B. Bai P. Z. Cao M. S. Cao J. S. Wang
College of Civil Engineering, Hohai University, Nanjing, China College of Civil Engineering, Hohai University, Nanjing, China College of Hydraulic and Civil Engine Construction Design Company of Shandong Taihang, Jinan, China
国际会议
上海
英文
219-228
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）