基于损伤的钢筋混凝土锈胀开裂模型
发布时间：2019-01-02 20:20
【摘要】：基于混凝土的各向异性损伤,建立考虑钢筋、腐蚀产物、混凝土三者不同力学性能的钢筋锈胀导致保护层开裂的数学模型。模型考虑了腐蚀产物对钢筋混凝土界面区的孔隙和混凝土开裂裂缝的填充效应,采用非线性分析算法,预测了开裂过程中混凝土构件的应变与位移以及混凝土保护层开裂时间。最后将模型预测值与试验结果进行对比,结果表明:当混凝土出现裂缝之后,混凝土产生软化、腐蚀产物对裂缝进行填充,从而使混凝土环向拉应变的增长速率减缓;在选定钢筋的型号、直径以及混凝土强度之后,可通过增大保护层厚度来减小钢筋锈胀开裂的风险。
[Abstract]:Based on the anisotropic damage of concrete, a mathematical model of the cracking of the protective layer is established, which takes into account the different mechanical properties of steel bar, corrosion product and concrete. The model takes into account the filling effect of corrosion products on the pores and cracks in the reinforced concrete interface area. The nonlinear analysis algorithm is used to predict the strain and displacement of concrete members and the cracking time of concrete cover during the cracking process. Finally, the model prediction value is compared with the test results. The results show that the concrete softens and the corrosion products fill the cracks when the concrete cracks appear, thus slowing down the growth rate of the concrete circumferential tensile strain. After selecting the type, diameter and strength of the steel bar, the risk of corrosion cracking can be reduced by increasing the thickness of the protective layer.
【作者单位】： 浙江大学建筑工程学院;广西壮族自治区住房和城乡建设厅;浙江工业大学建筑工程学院;
【基金】：国家高技术研究发展计划(863计划)(2012AA050903) 国家自然科学基金项目(51178413,51320105013,51308503)
【分类号】：TU528.571
[Abstract]:Based on the anisotropic damage of concrete, a mathematical model of the cracking of the protective layer is established, which takes into account the different mechanical properties of steel bar, corrosion product and concrete. The model takes into account the filling effect of corrosion products on the pores and cracks in the reinforced concrete interface area. The nonlinear analysis algorithm is used to predict the strain and displacement of concrete members and the cracking time of concrete cover during the cracking process. Finally, the model prediction value is compared with the test results. The results show that the concrete softens and the corrosion products fill the cracks when the concrete cracks appear, thus slowing down the growth rate of the concrete circumferential tensile strain. After selecting the type, diameter and strength of the steel bar, the risk of corrosion cracking can be reduced by increasing the thickness of the protective layer.
【作者单位】： 浙江大学建筑工程学院;广西壮族自治区住房和城乡建设厅;浙江工业大学建筑工程学院;
【基金】：国家高技术研究发展计划(863计划)(2012AA050903) 国家自然科学基金项目(51178413,51320105013,51308503)
【分类号】：TU528.571
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