COMPUTATIONAL MODELING OF SHRINKAGE INDUCED CRACKING IN EARLY-AGE CONCRETE BASED ON THE UNIFIED PHASE-FIELD THEORY1)
Wu Jianying,*,?,2), Chen Wanxin?, Huang Yuli***State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China ?Department of Civil Engineering, South China University of Technology, Guangzhou 510641, China **Department of Civil Engineering, Tsinghua University, Beijing 100084, China
Abstract During curing of concrete, hydration and thermal transfer inevitably result in expansion and shrinkage and hence, large tensile stresses in early-age concrete structures. As the mechanical properties of young concrete are still very low, structures are vulnerable in the construction stage to defects induced by crack nucleation, propagation and evolution, severely threatening the integrity, durability and safety of concrete structures and infrastructures like nuclear containment vessels, bridges and tunnel linings, hydraulic and off-shore structures. In order to predict the fracture property of early-age concrete and quantify its adverse effects on structural performances, it is pressing to investigate the computational modeling of early-age cracking in concrete structures under the chemo-thermo-mechanically coupled environment. To the above end, in this work we propose a multi-physically coupled phase-field cohesive zone model within our previously established framework of the unified phase-field theory. The interactions between the crack phase-field with the hydration reaction and thermal transfer are accounted for, and the dependence of the characteristics of crack phase-field evolution, e.g., the strength-based nucleation criterion, the energy-based propagation criterion and the variational principle based crack path chooser, etc., on the hydration degree and/or temperature, are quantified. Moreover, the numerical implementation of the proposed model in the context of the multi-field finite element method is also addressed. Representative numerical examples indicate that, with the couplings among hydration, thermal transfer, mechanical deformations and cracking as well as the competition between thermal expansion and autogenous shrinkage both properly accounted for, the proposed multiphysical phase-field cohesive zone model is able to reproduce the overall cracking process and fracture property quantitatively. Remarkably, the numerical predictions are affected by neither the phase-field length scale nor the mesh discretization, ensuing its promising prospective in fracture control of early-age concrete structures. Keywords:concrete;early-age cracking;multi-physics;phase-field theory;phase-field cohesive zone model
PDF (4207KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 吴建营, 陈万昕, 黄羽立. 基于统一相场理论的早龄期混凝土化-热-力多场耦合裂缝模拟与抗裂性能预测1). 力学学报, 2021, 53(5): 1367-1382 DOI:10.6052/0459-1879-21-020 Wu Jianying, Chen Wanxin, Huang Yuli. COMPUTATIONAL MODELING OF SHRINKAGE INDUCED CRACKING IN EARLY-AGE CONCRETE BASED ON THE UNIFIED PHASE-FIELD THEORY1). Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(5): 1367-1382 DOI:10.6052/0459-1879-21-020
Fig.10Restrained concrete ring test: Specimen geometry and environment conditions[68]
混凝土圆环试件的厚度为75 mm, 内直径为150 mm, 外直径为300 mm. 试验中考虑了3.1 mm, 9.5 mm和19.0 mm 3种厚度的约束钢环(其中, 3.1 mm厚度圆环试件由于刚度较小、约束效应较低, 混凝土试件并未开裂, 故这里仅考虑后两种厚度情况), 并通过贴在钢环中部位置的4个应变片监测钢环应变. 所采用的材料(水灰比$w/c = 0.3$的砂浆)和模型参数见表2; 混凝土水化反应演化函数如图11所示.
Table 2 表2 表2受约束圆环试验收缩开裂试验参数取值 Table 2Model parameters for the cracking analysis of a constrained concrete ring
Fig.12Restrained concrete ring test: Predicted contours of the crack phase-field at various time instants for different length scale parameters (thickness of the steel ring: 19 mm)
Fig.13Restrained concrete ring test: Predicted contours of the crack phase-field at various time instants for different length scale parameters (thickness of the steel ring: 9.5 mm)
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