考虑混凝土损伤效应的销栓作用承载力计算模型

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清华大学辅仁网/2017-07-07

李鹏飞¹, 安雪晖¹, 何世钦², 陈宸²

1. 清华大学水沙科学与水利水电工程国家重点实验室, 北京 100084;
2. 北方工业大学土木工程学院, 北京 100144

Mathematical model for dowel bearing capacity considering the effect of concrete damage

LI Pengfei¹, AN Xuehui¹, HE Shiqin², CHEN Chen²

1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
2. College of Civil Engineering, North China University of Technology, Beijing 100144, China

摘要:

输出: BibTeX | EndNote (RIS)

摘要在已有钢筋销栓作用承载力计算模型的基础上，该文提出了考虑混凝土损伤效应的承载力计算模型，进行了11个试件的直接剪切实验，研究钢筋直径、混凝土抗压强度和保护层厚度对销栓作用承载性能的影响。基于实验和数值分析结果，率定混凝土局部受压损伤效应所造成的承载性能衰减并对常用模型进行修正。通过对不同保护层厚度试件的数值模拟，率定出破坏形态转化的关键影响因子，并在计算模型中加以考虑。将直接剪切实验和文献实验的结果与修正后的模型计算结果进行对比发现：该文提出的考虑损伤效应的计算模型可以准确地预测不同破坏模式下钢筋销栓作用的承载性能。

关键词 ：销栓作用,损伤效应,计算模型,混凝土保护层,有限元法

Abstract：The measured bearing capacities of dowels embedded in concrete were compared with existing formula for various conditions. A total of 11 specimens were tested to failure to investigate the effect of the bar diameter, concrete strength and concrete cover on the dowel bearing capacity. The effect of localized crushing of the concrete found from the experiment and numerical results was used to improve the formula accuracy. Specimens with different concrete covers were simulated to study the key parameters affecters the failure mechanisms. Comparisons of the analytical results with experimental data showed that the model gives good predictions for both failure mechanisms.

Key words：dowel action damage effect mathematical model concrete cover finite element method

收稿日期: 2016-02-01 出版日期: 2016-12-20

ZTFLH:	TU312
	TV32

通讯作者:安雪晖,教授,E-mail:anxue@tsinghua.edu.cnE-mail: anxue@tsinghua.edu.cn

引用本文:

李鹏飞, 安雪晖, 何世钦, 陈宸. 考虑混凝土损伤效应的销栓作用承载力计算模型[J]. 清华大学学报（自然科学版）, 2016, 56(12): 1255-1263.
LI Pengfei, AN Xuehui, HE Shiqin, CHEN Chen. Mathematical model for dowel bearing capacity considering the effect of concrete damage. Journal of Tsinghua University(Science and Technology), 2016, 56(12): 1255-1263.

链接本文:

http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.25.035或 http://jst.tsinghuajournals.com/CN/Y2016/V56/I12/1255

图表:

图1 实验方案设计及试件破坏照片

表1 混凝土配合比

表2 实验参数及最终承载力

图2 混凝土的耦合损伤效应及有限元模拟结果

表3 直接剪切实验计算结果对比

表4 DeiPoli实验^[17-18]计算结果对比

图3 承载力计算结果对比

图4 损伤因子与材性因子的相关关系

表5 不同保护层厚度试件的模拟结果

图5 保护层影响因子的率定

表6 文献实验参数和破坏模式

图6 模型计算结果与实验结果对比

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