混凝土受拉动态破坏过程的细观数值方法研究

尹相振; 王立成; 鲍玖文

doi:10.13409/j.cnki.jdpme.2015.03.014

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混凝土受拉动态破坏过程的细观数值方法研究

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- 混凝土受拉动态破坏过程的细观数值方法研究
- Mesoscale Modeling of the Dynamic Failure Process of Concrete under Tensile Loading
- 防灾减灾工程学报 2015年35卷第3期页码：365-372
- 作者机构：
- 作者简介：
- 基金信息：
  
  中央高校基本科研业务费专项（DUT14LK23）资助
- DOI：10.13409/j.cnki.jdpme.2015.03.014
  中图分类号： U528
- 纸质出版：2015
- 稿件说明：
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[1]尹相振,王立成,鲍玖文.混凝土受拉动态破坏过程的细观数值方法研究[J].防灾减灾工程学报,2015,35(03):365-372.

尹相振, 王立成, 鲍玖文. Mesoscale Modeling of the Dynamic Failure Process of Concrete under Tensile Loading[J]. 2015, 35(3): 365-372.
[1]尹相振,王立成,鲍玖文.混凝土受拉动态破坏过程的细观数值方法研究[J].防灾减灾工程学报,2015,35(03):365-372. DOI： 10.13409/j.cnki.jdpme.2015.03.014.

尹相振, 王立成, 鲍玖文. Mesoscale Modeling of the Dynamic Failure Process of Concrete under Tensile Loading[J]. 2015, 35(3): 365-372. DOI： 10.13409/j.cnki.jdpme.2015.03.014.

摘要

混凝土在宏观层次上属于各向同性材料

但在细观层次上可视为由粗骨料、砂浆以及二者界面组成的三相非均质复合材料。混凝土是一种典型的率敏感材料

不同应变率水平下存在不同的强度增长机制。从混凝土细观结构出发

提出了混凝土动态受力分析的刚体弹簧元（Rigid Body Spring Model

RBSM）方法

通过建立混凝土细观各相组成材料的粘弹塑性损伤本构模型

充分考虑Stefan效应在中低应变率水平下对混凝土力学性能的影响

模拟了混凝土的强度增长规律。对砂浆、混凝土试件的单轴受拉动态破坏分析表明

本文建立的动态弹簧元模型能较好地模拟混凝土强度随应变率增长而提高的规律

而且能够跟踪加载过程中混凝土内部的裂缝开展过程和最终破坏形态。

Abstract

Concrete is an isotropic material at macro level

but at the meso level

it is usually treated as a heterogeneous material consisting of coarse aggregate

mortar and the interfacial transition zone（ITZ）between coarse aggregate and mortar.Moreover

as a typical rate-sensitive material

there are various physical mechanisms that shape the strength increasing behaviour of concrete.In the current paper

considering the influence of Stefan effect on the concrete subjected to intermediate loading rate

the Rigid Body Spring Model（RBSM）in mesoscale development simulates the dynamic failure process of concrete

in which a visco-elastic and visco-plastic damage model is applied to describe the rate dependency.Numerical modeling of mortar and concrete under uniaxial dynamic tension illustrates the capabilities of the proposed model in simulating the dynamic behavior of materials with respect to the strength increasing

crack developing and the final failure patterns.

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Keywords

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