冲击荷载作用下含裂纹的钢筋混凝土梁动力响应及裂纹扩展分析  

Analysis on dynamic response and crack development of reinforced concrete beams with crack under impact loading

作　　者：王天奇 付朝江 林悦荣 杨绵越 WANG Tianqi;FU Chaojiang;LIN Yuerong;YANG Mianyue(College of Civil Engineering,Fujian University of Technology,Fuzhou 350108,China;Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fuzhou 350108,China;College of Civil Engineering,Fuzhou University,Fuzhou 350106,China)

机构地区：[1]福建工程学院土木工程学院,福建福州350108 [2]福建省土木工程新技术与信息化重点实验室,福建福州350108 [3]福州大学土木工程学院,福建福州350106

出　　处：《混凝土》2020年第8期41-45,共5页Concrete

基　　金：国家自然基金面上项目(51378124)。

摘　　要：含裂纹的钢筋混凝土梁在冲击荷载作用下的冲击响应是一个复杂的非线性过程。采用最大主应力准则作为混凝土的开裂准则。利用ABAQUS建立了冲击荷载下含裂纹的钢筋混凝土梁的三维模型,其中,混凝土梁采用三维实体单元,钢筋采用桁架单元,不考虑钢筋与混凝土之间的黏结滑移。通过沙漏能控制确保数值模拟方案的精确性与合理性。通过改变冲击速度、冲击块质量和配筋率等参数,得到这些参数对冲击作用下含跨中裂纹的钢筋混凝土梁的动力响应与裂纹扩展的影响,揭示冲击响应与裂纹扩展随参数变化规律。结果表明:随着冲击速度、冲击块质量的增大,钢筋混凝土梁激起的响应越剧烈;配筋率的提高可以增加钢筋混凝土梁的抗冲击性能;裂纹为非均速发展,前期裂纹发展速度较快,后期扩展速率较慢;提高配筋率可以抑制裂纹的发展。The impact response of reinforced concrete beams with cracks subjected to impact is a complex nonlinear process.The maximum principal stress criterion is adopted to simulate cracking behavior of concrete.A three-dimensional model of reinforced concrete beams with cracks under impact load is established using ABAQUS finite element analysis software.The concrete beam is composed of three-dimensional solid elements and the steel bars are composed of truss elements,without considering the bond slip between the steel bars and the concrete.By investigating the proportion of the hourglass energy,the accuracy and rationality of the numerical simulation scheme are verified.By changing the impact speed,impact mass and reinforcement ratio,the effects of these parameters on the dynamic response and crack development of reinforced concrete beams with cracks are investigated,and the distribution regularity of the dynamic response and crack development with different parameters are explained.The results show that the increase of impact speed and impact mass will intensify dynamic response of reinforced concrete beam.The increase of reinforcement ratio can increase impact resistance of reinforced concrete beam.Fractures do not develop at a uniform rate.The growth rate of fractures is faster in the early stage and slower in the later stage.The increase of reinforcement ratio can restrain the development of cracks.

关 键 词：冲击荷载 动力响应 裂纹扩展 参数分析 

分 类 号：TU528.01[建筑科学—建筑技术科学]