吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (4): 1090-1096.doi: 10.13229/j.cnki.jdxbgxb201604012

• 论文 • 上一篇    下一篇

基于应变监测的连续梁支承差异沉降识别

王少杰1, 2, 徐赵东3, 李舒1, 王凯洋1 ,Dyke Shirley J2   

  1. 1.东南大学 混凝土及预应力混凝土结构教育部重点实验室,南京 210096;
    2.普渡大学 土木工程学院,美国 西拉斐特 47907;
    3.南京东瑞减震控制科技有限公司,南京 210033
  • 收稿日期:2015-03-05 出版日期:2016-07-20 发布日期:2016-07-20
  • 通讯作者: 徐赵东(1975-),男,教授,博士生导师.研究方向:结构健康监测,结构抗震及减振.E-mail:zhdxu@163.com
  • 作者简介:王少杰(1985-),男,博士研究生.研究方向:结构检测、监测与车桥耦合振动.E-mail:tumuwsj@163.com
  • 基金资助:

    江苏省杰出青年基金项目(BK20140025); 江苏省自然科学基金项目(BK20151092); 科技部中青年科技创新领军人才项目; 江苏省普通高校研究生科研创新计划项目(CXLX13_102,CXZZ12_0108); 中央高校基本科研业务费专项资金项目(3205004907)

Differential settlement identification of pier for continuous beam based on strain monitoring

WANG Shao-jie1, 2, XU Zhao-dong3, LI Shu1, WANG Kai-yang1, Dyke Shirley J2   

  1. 1.Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China;
    2.School of Civil Engineering, Purdue University, West Lafayette 47907, USA;
    3.Nanjing Dongrui Damping Control Technology Co.,Ltd.,Nanjing 210033,China
  • Received:2015-03-05 Online:2016-07-20 Published:2016-07-20

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摘要：

首先,运用基本力学原理,以三跨相等连续梁为对象,推导了梁体应变改变量与支承差异沉降量之间的解析式;并以某刚性轻轨桥为例,证明了微小支承差异沉降导致的应变改变量是可测的。其次,通过三跨不等连续梁模型试验,采用顶升方法模拟差异沉降,深入分析了梁底应变改变量与顶升量之间的关系,同时验证了FBG新型传感器的优越性能。再次,推导了与试验模型对应的梁底应变改变量与桥墩差异沉降之间的关系式,对两种模式(边墩顶升、中墩顶升)在不同差异沉降下的理论解与试验测试结果进行比较分析,结果表明二者吻合程度较高。最后,对识别基本流程与策略作了简要叙述。

关键词: 结构工程, 应变, 差异沉降, 连续梁, 模型试验

Abstract:

Based on measured strain data, a method of differential settlement identification of piers for continuous beam is proposed using theoretical and experimental analysis. First, the analytical formula with respect to the Variation of Strain Value (VSV) of the beam and the differential settlement identification of piers is derived by employing a three-equal-span continuous beam for instance. Also it is proved that the VSV result from minor differential settlement of piers is measureable in the case of a certain rigid light railway bridge. Second, the relationship between the VSV obtained from the bottom of the beam and the upright rectification value is analyzed using a three-unequal-span continuous beam for verification, where the settlement is simulated using the upright rectification method. Meanwhile, the performance of the new type Fiber Bragg Grating (FBG) sensors is demonstrated as well. Third, for the experimental model, the expression of the relationship between the VSV on the bottom of the beam and the differential settlement of the piers is derived, which reflects a well consistency between theoretical and experimental results in both cases (differential settlement of side pier and mid pier) under the condition of various degrees of differential settlement. Finally, the identification procedure and strategy are briefly clarified.

Key words: structure engineering, strain, differential settlement, continuous beam, model experiment

中图分类号: 

  • TU997
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