带混合暗支撑钢筋混凝土核心筒的弹塑性性能分析

Analysis of Elastic-plastic Performance of Reinforced Concrete Core Tube with Mixed Concealed Bracings

运用ABAQUS软件分别对普通和带混合暗支撑的钢筋混凝土核心筒进行动力弹塑性分析和静力弹塑性分析,并对两者的弹塑性性能进行比较。分析表明:与普通钢筋混凝土核心筒相比,带混合暗支撑钢筋混凝土核心筒的承载力和变形能力显著提高,刚度分布更为均匀,表现出更好的整体性。基于此,进一步研究了连梁跨高比、角柱含钢率以及墙肢斜撑布置形式等因素对带混合暗支撑钢筋混凝土核心筒弹塑性性能的影响,结果表明:随着连梁高度的增大,带混合暗支撑钢筋混凝土核心筒的承载力显著增大,而变形能力则逐渐降低;随着角柱含钢率的增加,带混合暗支撑钢筋混凝土核心筒的承载力同样逐渐增大;与每层仅有一组墙肢斜撑的布置形式相比,每层两组墙肢斜撑的布置形式承载力更高、布置形式更优。

In this paper,dynamic time history analysis and Pushover analysis are carried out to study and compare the elastic-plastic performance of ordinary reinforced concrete core tube and reinforced concrete core tube with mixed concealed bracings.The results indicate that compared with ordinary reinforced concrete core tube,the load-bearing capacity,deformation capacity,and integrity of reinforced concrete core tube with mixed concealed bracings have been improved,and the distribution of stiffness is also more uniform.Then a further study is conducted to research the effect of some parameters on the elastic-plastic performance of reinforced concrete core tube with mixed concealed bracings.The parameters consist of the span-depth ratios of coupling beam,the steel ratio of corner column and the disposal mode of diagonal bracing in wall limb.The results indicate that the load-bearing capacity of reinforced concrete core tube with mixed concealed bracings can be improved by increasing the depth of coupling beam and the steel ratio of corner column,and its deformation capacity is reduced when the depth of coupling beam is increased.Compared with the disposal mode of one group of bracings in each floor,the disposal mode of two groups of bracings in each floor has higher load-bearing capacity.