用改良模型分析缺陷混凝土梁的动强度

覃源; 柴军瑞; 党发宁

doi:10.11835/j.issn.1674-4764.2012.04.014

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用改良模型分析缺陷混凝土梁的动强度

更新时间：2023-11-28

- 用改良模型分析缺陷混凝土梁的动强度
- Numerical Analysis on the Modified Model to the Dynamic Strength of Defective Concrete Beam
- 土木与环境工程学报（中英文） 2012年34卷第4期页码：85-90
- 作者机构：
  
  1. 西安理工大学水利水电学院,西安,710048
  2. 三峡大学土木水电学院,湖北,宜昌,443002
- 作者简介：
- 基金信息：
  
  国家自然科学基金面上项目(50679073);国家自然科学基金重点项目(90510017)
- DOI：10.11835/j.issn.1674-4764.2012.04.014
  中图分类号：
- 纸质出版：2012
- 稿件说明：
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覃源, 柴军瑞, 党发宁. 用改良模型分析缺陷混凝土梁的动强度[J]. 土木与环境工程学报（中英文）, 2012,34(4):85-90.

QIN Yuan, CHAI Junrui, DANG Faning. Numerical Analysis on the Modified Model to the Dynamic Strength of Defective Concrete Beam[J]. Journal of Civil and Environmental Engineering, 2012, 34(4): 85-90.
覃源, 柴军瑞, 党发宁. 用改良模型分析缺陷混凝土梁的动强度[J]. 土木与环境工程学报（中英文）, 2012,34(4):85-90. DOI： 10.11835/j.issn.1674-4764.2012.04.014.

QIN Yuan, CHAI Junrui, DANG Faning. Numerical Analysis on the Modified Model to the Dynamic Strength of Defective Concrete Beam[J]. Journal of Civil and Environmental Engineering, 2012, 34(4): 85-90. DOI： 10.11835/j.issn.1674-4764.2012.04.014.

摘要

改进了传统的数字混凝土建模方法，利用新方法建立了存在初始缺陷的混凝土梁三点弯数值试验模型，随后对所建立的模型进行了3种工况的数值模拟。分析了初始缺陷的存在对混凝土动强度的影响规律，结果显示：在加载初期，加载速率越高，初始缺陷对材料动强度的影响越明显，但是在加载后期此影响减弱；当荷载达到材料的强度点时，不同的加载速率下，初始缺陷对混凝土材料动强度影响均不显著。通过与试验结果的对比，发现改进后的模型计算精度高于传统模型，计算结果更加合理，在工程实际当中能够取代传统的数字混凝土模型。

Abstract

By improving the traditional digital concrete modeling method

the new defective concrete model was established. Three cases were simulated based on this model. The influence of initial defectiveness on the dynamic strength was investigated. The result shows that: 1) At initial stage

the influence of the initial defectiveness on the dynamic strength becomes more obviously with the increasing of the loading speed; 2) Regardless of the same loading speed

the influence becomes less obviously when the load reaches the strength point of the concrete; 3)The simulation result is compared with the test result

and it is deduced that the new model has higher computational accuracy and the result is more rational

and it can take the place of the traditional digital concrete model in practice.

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