基于扩展有限元进行钢筋混凝土柱捏拢效应的机理分析
发布时间：2019-02-22 13:18
【摘要】：预测地震荷载下钢筋混凝土柱的力学性能,对评估震后混凝土结构的安全性和震害损失具有重要意义。由于混凝土材料在受力过程中的复杂性,目前对钢筋混凝土结构力学性能的模拟主要依靠数值方法。已有的数值模拟方法大都基于有限元法,将混凝土视为连续体,通过人为定义参数来指定混凝土的滞回本构,因此存在一定的主观性与局限性。该文结合扩展有限元法与断裂准则,直接模拟混凝土裂缝的开展与闭合,并考虑钢筋和混凝土的粘结滑移作用,通过数值计算,直接再现了钢筋混凝土结构在低周反复荷载下的力学行为。模拟方法得到了试验的验证,与结果吻合较好。该文进一步分析了钢筋混凝土柱的滞回行为中混凝土、钢筋的各自作用和相互抵消行为,从细观的角度,在机理上揭示了捏拢效应出现的三个主要原因。
[Abstract]:It is important to predict the mechanical properties of reinforced concrete columns under earthquake load and to evaluate the safety and damage loss of post-earthquake concrete structures. Because of the complexity of concrete material in the process of loading, the numerical method is used to simulate the mechanical properties of reinforced concrete structures. Most of the existing numerical simulation methods are based on finite element method, the concrete is regarded as a continuum, and the hysteretic constitutive structure of concrete is determined by defining parameters artificially, so it has some subjectivity and limitation. Combined with the extended finite element method and fracture criterion, this paper directly simulates the development and closure of concrete cracks, and considers the bond-slip effect of steel bar and concrete. The mechanical behavior of reinforced concrete structures under low cyclic loading is directly reproduced. The simulation method is verified by experiments and the results are in good agreement. In this paper, the respective action and counteracting behavior of reinforced concrete columns in hysteretic behavior of reinforced concrete columns are further analyzed. From the viewpoint of meso, three main reasons for the occurrence of pinch effect are revealed from the point of view of meso.
【作者单位】： 同济大学结构工程与防灾研究所;
【基金】：国家自然科学基金项目(51008235,51378397) 上海市工程结构新技术重点实验室开放课题项目(2013-KF03)
【分类号】：TU375.3
[Abstract]:It is important to predict the mechanical properties of reinforced concrete columns under earthquake load and to evaluate the safety and damage loss of post-earthquake concrete structures. Because of the complexity of concrete material in the process of loading, the numerical method is used to simulate the mechanical properties of reinforced concrete structures. Most of the existing numerical simulation methods are based on finite element method, the concrete is regarded as a continuum, and the hysteretic constitutive structure of concrete is determined by defining parameters artificially, so it has some subjectivity and limitation. Combined with the extended finite element method and fracture criterion, this paper directly simulates the development and closure of concrete cracks, and considers the bond-slip effect of steel bar and concrete. The mechanical behavior of reinforced concrete structures under low cyclic loading is directly reproduced. The simulation method is verified by experiments and the results are in good agreement. In this paper, the respective action and counteracting behavior of reinforced concrete columns in hysteretic behavior of reinforced concrete columns are further analyzed. From the viewpoint of meso, three main reasons for the occurrence of pinch effect are revealed from the point of view of meso.
【作者单位】： 同济大学结构工程与防灾研究所;
【基金】：国家自然科学基金项目(51008235,51378397) 上海市工程结构新技术重点实验室开放课题项目(2013-KF03)
【分类号】：TU375.3
【参考文献】
相关期刊论文 前7条
1 汪训流;陆新征;叶列平;;往复荷载下钢筋混凝土柱受力性能的数值模拟[J];工程力学;2007年12期
2 聂建国;王宇航;;基于ABAQUS的钢-混凝土组合结构纤维梁模型的开发及应用[J];工程力学;2012年01期
3 聂祺;唐曹明;林春哲;;基于纤维梁元模型的钢筋混凝土框架结构弹塑性时程分析[J];工业建筑;2011年S1期
4 程翔云 ,邹银生;在循环荷载作用下钢筋混凝土压弯构件的试验和滞回模型[J];湖南大学学报;1981年01期
5 陈适才;陆新征;任爱珠;江见鲸;;基于纤维梁模型的火灾下多层混凝土框架非线性分析[J];建筑结构学报;2009年06期
6 姜庆远;叶燕春;刘宗仁;;弥散裂缝模型的应用探讨[J];土木工程学报;2008年02期
7 赵冠远;安明U，
本文编号：2428268
本文链接：https://www.wllwen.com/guanlilunwen/chengjian/2428268.html
