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| Discussion on strength criterion used in the meso-failure of concrete under multi-axial loading conditions |
| Received:April 26, 2014 Revised:June 08, 2014 |
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| DOI：10.7511/jslx201503005 |
| KeyWord:concrete meso-scale complex loading strength criterion failure simulation |
| Author | Institution |
| 金浏 |
北京工业大学 城市与工程安全减灾教育部重点实验室, 北京 |
| 杜修力 |
北京工业大学 城市与工程安全减灾教育部重点实验室, 北京 |
| 黄景琦 |
北京工业大学 城市与工程安全减灾教育部重点实验室, 北京 |
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| Abstract: |
| Concrete engineering structures often work under biaxial or tri-axial stress states,and most of the existed efforts were mainly concerned with the uniaxial mechanical properties of concrete.So far,little work has been conducted on the mechanical behavior of concrete under biaxial or tri-axial loadings.In the simulations for the meso-failure of concrete under complex loading conditions,whether the selected strength criterion is reasonable or not,will become a key factor that the numerical results of the failure modes and the macro-mechanical properties of concrete are accurate or not.The objective of the present study is to judge the rationality of the uniaxial strength criterion used in the meso-failure of concrete subjected to complex or multi-axial loadings,for instance,the maximum tensile strain criterion.In light of this,a two-dimensional random aggregate structure of concrete was established at meso-scale.An elastic damage model and a plasticity damage model were employed respectively to describe the mechanical performances of the concrete meso constituent (i.e.mortar matrix),and the aggregate was set as elastic.Subsequently,the meso-scale failure processes of concrete under biaxial loading conditions were investigated.Moreover,a comparison was made between the failure paths and macroscopic mecha-nical properties of concrete obtained on the basis of the uniaxial strength criterion and the multi-axial strength criterion.The numerical results indicate that the uniaxial strength criterion is hard to describe the stress state complexity of concrete under biaxial loadings,and thus the uniaxial strength criterion is not suitable for description of the failure mechanism of concrete under complex loading conditions. |
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