新型矩形盾构接头力学性态的有限元分析

发布时间：2018-07-02 09:02

  本文选题：矩形盾构管片接头 + 力学性态　； 参考：《隧道建设》2017年10期

【摘要】：为分析评价带有接头盒的大断面矩形盾构管片接头构造和受力的合理性,基于管片纵缝接头足尺力学试验的结果,采用ABAQUS有限元软件建立该类盾构管片纵缝接头的三维精细化计算模型。通过一些分析指标,定性定量地评价在正常使用条件下各个接头的工作性态,研究正负弯矩工况下接头受力全过程的特征。结果表明:1)正弯矩工况下的接头,弯矩-转角全过程破坏曲线呈现三折线模式,在正常使用条件下各接头均处于第2阶段,转动刚度约为100 MN·m/rad,部件均处于弹性工况,接头设计与位置选择合理;2)负弯矩工况下的接头,弯矩-转角全过程破坏曲线呈现双折线模式,正常使用工况下各接头均处于第1阶段,转动刚度约为276 MN·m/rad,但接头受力处于2阶段的临界位置,所受负弯矩值偏大,安全储备较低,设计时应当注意。
[Abstract]:In order to analyze and evaluate the structure and force rationality of large section rectangular shield segment joint with joint box, based on the results of full-scale mechanical test of segment longitudinal joint, Abaqus finite element software is used to establish the three dimensional fine calculation model of longitudinal joint of shield segment. The working behavior of joints under normal working conditions is evaluated qualitatively and quantitatively through some analysis indexes, and the characteristics of the whole process of joint stress under positive and negative moment conditions are studied. The results show that in the case of positive bending moment, the failure curve of the whole process of bending moment and rotation angle is in the three broken line mode. Under the normal service conditions, the joints are in the second stage, the rotational stiffness is about 100 MN / M / rad, and the components are in the elastic condition. The joint design and position selection are reasonable (2) under the negative moment condition, the failure curve of the whole process of bending moment and angle presents the double broken line mode, and each joint is in the first stage under the normal working condition. The rotational stiffness is about 276MN m / r rad. but the joint is in the critical position of two stages, the negative moment is larger and the safety reserve is lower, so we should pay attention to the design.
【作者单位】： 同济大学土木工程学院地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;上海市城市建设设计研究总院;
【基金】：国家自然科学基金资助项目(51378388) 上海市科委项目(15XD1522500,16DZ1201701,17DZ1203402)
【分类号】：U455.43
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本文编号：2089616