水利水电技术2018，Vol.49Issue(3)：46-52,7.DOI:10.13928/j.cnki.wrahe.2018.03.007
基于扩展有限元法的混凝土三点弯曲梁裂缝扩展模拟研究
Study on X-FEM-based simulation on crack-propagation of three-point bending concrete beam
摘要
Abstract
The full-cracking process of three-point bending concrete beam is simulated with the extended finite element method (X-FEM),and then the load-displacement curves (P-CMOD) of the beam under the conditions of different crack-height ratios,different specimen thicknesses are obtained.Combined with both the principle of linear superposition and the double-K fracture criterion,the fracturing parameters are calculated,while these parameters are comparatively analyzed at the same time as well.Numerical simulations are made on the three-point bending concrete beams with different distance-offset cracks,and then the influences from cracking development law and bearing capacity on the initial cracking locations are analyzed.Through the comparing with the fracturing law obtained from the existing experiment concerned,the results show that the cracking load and the instability load decrease with the increase of the crack-depth ratio.The cracking load and the instability load increase with the increase of the thickness of the samples,but there is no obvious change in the crack toughness and the instatility toughness.Its fracturing law that accords with the experiment is found out,thus the reasonability of the extended finite element method (X-FEM) is verified.关键词
扩展有限元/三点弯曲/断裂参数/双K断裂准则Key words
extended finite element method (X-FEM)/three-point bending concrete beam/fracturing parameter/double-K fracture criterion分类
建筑与水利引用本文复制引用
覃源,易勇生,柴军瑞,张鲜维..基于扩展有限元法的混凝土三点弯曲梁裂缝扩展模拟研究[J].水利水电技术,2018,49(3):46-52,7.基金项目
国家自然科学基金青年基金项目(51409208) （51409208）
