摘要
钢板-混凝土组合剪力墙由钢框架、内嵌钢板及一侧通过螺栓与之连接的混凝土板组成,其中传统组合剪力墙中混凝土板四边与钢框架直接接触,而改进组合剪力墙中二者之间有一定间距,以避免其在结构侧移较小时发生接触。采用ABAQUS有限元软件分别建立了组合剪力墙的精细有限元模型,研究了其受力性能以及板框相互作用全过程,分析了钢板高厚比对组合剪力墙整体承载力、抗侧刚度以及板框剪力分配等的影响。研究表明:组合剪力墙中混凝土板有效抑制钢板弹性屈曲,钢板主要以剪切屈服承载,对框架柱的附加弯矩较钢板剪力墙明显降低;相比钢板剪力墙,传统组合剪力墙承载力提高25%,抗侧刚度提高10%,混凝土板承载近30%;改进组合剪力墙承载力提高10%,抗侧刚度提高5%,混凝土板基本不承担剪力;随着钢板高厚比的减小,组合剪力墙的承载力与抗侧刚度提高,但两类组合剪力墙之间的差别变小;钢板承载比例不断增大,当钢板过厚时需要防止底层框架过早屈服。
The steel-concrete composite shear wall system studied herein consists of a steel boundary frame,a steel infill wall with a reinforced concrete wall attached to one side by bolts. In the traditional system the reinforced concrete wall is in direct contact with the boundary steel frame,while in the innovative system there is a gap in between to prevent contact when lateral displacement is small. ABAQUS was used to establish refined finite element models of these two types of composite shear wall systems,and analyses were conducted to reveal the whole process of the lateral force resisting mechanism and the wall-frame interaction. Parametric studies were conducted on the influence of heightto-thickness ratio of the infill wall on the overall capacity,lateral stiffness,shear force distribution between wall and frame of the composite shear walls. Results show that the concrete wall can effectively prohibit elastic buckling of the steel wall; shear yielding is the main lateral load resisting mechanism of the steel wall; and the additional bending moment on the boundary column is obviously reduced as compared to steel shear walls. Bearing capacity and lateral stiffness of the traditional composite shear wall are increased by 25% and 10% respectively compared to steel plate shear wall. The concrete wall carries nearly 30% of the total lateral load,which may cause more severe damage to it in later stages. Bearing capacity and lateral stiffness of the innovative composite shear wall are increased by 10% and 5%respectively compared to steel plate shear wall,with the concrete wall carrying the minimum lateral load. As height-tothickness ratio of the steel plate is decreased,the bearing capacity and the lateral stiffness of the composite shear wall systems are increased,while the difference between the two systems is reduced,and the portion of lateral load resisted by the steel wall is increased. When the steel plate is too thick,the bottom portion of the frame may yield prematurely.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2017年第S1期98-104,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51678406
51378340)
关键词
钢板-混凝土组合剪力墙
抗侧机理
板框相互作用
非线性推覆分析
steel-concrete composite shear wall
lateral-load resisting mechanism
wall-frame interaction
nonlinear push-over analysis
