型钢混凝土T形截面剪力墙基于性能的变形限值研究

Study on deformation limit index of steel reinforced concrete T-shaped shear wall based on performance

为更好地评估T形截面型钢混凝土(steel reinforced concrete,SRC)剪力墙变形性能,采用ABAQUS有限元软件对按照规范设计的324个T形截面SRC剪力墙构件的破坏形态和变形性能进行研究,根据收集的试验数据分析构件的破坏形态,提出T形截面SRC剪力墙的破坏形态划分准则;以构件的各材料应变极限值为准则来判别构件的性能状态,考虑轴压比、剪跨比、弯剪比、腹板暗柱配钢率、暗柱纵筋配筋率及箍筋暗柱特征值对构件变形性能的影响。对不同性能状态变形限值和参数进行线性回归分析,得到不同破坏类型下各性能状态位移角限值计算式;按规范ASCE 41修正各性能状态变形限值的失效概率,得到具有15%、20%、35%失效概率保证的各性能状态变形限值取值表。研究表明:剪跨比、轴压比对构件各性能状态位移角限值影响较大,暗柱腹板配钢率、纵筋配筋率及箍筋特征值对构件位移角限值影响相对较小,但能提高其延性。按规范ASCE 41修正后的位移角限值取值较为合理且有一定的安全储备。为T形截面SRC剪力墙基于性能的抗震设计与性能评估提供参考。

In order to better evaluate the T-shaped steel reinforced concrete(SRC)shear walls with the widespread application of steel reinforced concrete members deformation behavior,ABAQUS was used to study the failure morphology and deformation behavior of 324 T-shaped SRC shear wall designed according to specification.Based on to the collected test data,the failure mode of the members is analyzed,and the failure mode division criteria of T-shaped SRC shear wall is proposed.Based on the strain limit value of each material of the member,the component performance is judged,and the influence of axial compression ratio,shear span ratio,flexure shear ratio,steel ratio of the concealed column of the web,longitudinal reinforcement ratio of the concealed column and the characteristic value of the stirrup concealed column on the component deformation performance is considered.Through linear regression analysis of deformation limits and parameters in different performance states,the calculation formula of displacement angle limits in different performance states under different failure types is obtained.The failure probability of each performance state deformation limit is corrected according to ASCE 41,and the value table of each performance state deformation limit with 15%,20%and 35%failure probability guarantee is obtained.The research shows that the shear span ratio and axial compression ratio have greate impact on component displacement angle limit of each performance state,while the steel ratio of the concealed column web,the longitudinal reinforcement ratio and the characteristic value of the stirrup have relatively small impact on the displacement angle limit of the member,but can improve its ductility.The limit value of displacement angle corrected according to ASCE 41 is reasonable and has certain safety reserves.It provides reference for performance-based seismic design and performance evaluation of T-shaped SRC shear wall.