SMA节点自回复性能的有限元研究
发布时间：2019-03-15 09:13
【摘要】：已有研究显示,角钢尺寸对SMA节点滞回耗能和自回复性能有很大的影响,施加初始预应变可以显著改善节点小变形下的力学行为。为了进一步讨论螺杆预应变和角钢尺寸对SMA节点自回复性能的影响,分别以螺杆预应变、角钢承载力比为参数设计了一系列SMA节点,采用ANSYS14.5对上述节点进行有限元模拟,并分别从刚度、强度、延性、滞回耗能和自回复性能等五个方面讨论螺杆预应变和角钢承载力比对SMA节点抗震性能的影响。有限元结果表明:SMA节点残余层间位移角和滞回耗能量均与角钢承载力比近似呈线性关系;施加初始预应变可以明显改善节点初始刚度、提高节点极限承载力和自回复性能,但不能保证节点在大层间位移角下的延性。
[Abstract]:Previous studies have shown that the size of angle steel has a great influence on hysteretic energy consumption and self-recovery performance of SMA joints. The mechanical behavior of joints under small deformation can be significantly improved by applying initial pre-strain. In order to further discuss the influence of screw pre-strain and angle size on the self-recovery performance of SMA joints, a series of SMA joints were designed with screw pre-strain and angle steel bearing capacity ratio as parameters, and the finite element simulation of these joints was carried out by ANSYS14.5. The effects of screw pre-strain and bearing capacity ratio of angle steel on the seismic performance of SMA joints are discussed from the aspects of stiffness, strength, ductility, hysteretic energy dissipation and self-recovery performance. The results of finite element analysis show that the residual displacement angle and hysteretic energy of SMA joints are linearly related to the bearing capacity ratio of angle steel. Initial pre-strain can obviously improve the initial stiffness and ultimate bearing capacity and self-recovery performance of the joint, but it can not guarantee the ductility of the joint under the displacement angle between large floors.
【作者单位】： 同济大学土木工程防灾国家重点试验室;同济大学建筑工程系;
【基金】：曙光计划 十二五国家科技支撑计划课题(2015BAL03B01)
【分类号】：TU391
，
本文编号：2440492
[Abstract]:Previous studies have shown that the size of angle steel has a great influence on hysteretic energy consumption and self-recovery performance of SMA joints. The mechanical behavior of joints under small deformation can be significantly improved by applying initial pre-strain. In order to further discuss the influence of screw pre-strain and angle size on the self-recovery performance of SMA joints, a series of SMA joints were designed with screw pre-strain and angle steel bearing capacity ratio as parameters, and the finite element simulation of these joints was carried out by ANSYS14.5. The effects of screw pre-strain and bearing capacity ratio of angle steel on the seismic performance of SMA joints are discussed from the aspects of stiffness, strength, ductility, hysteretic energy dissipation and self-recovery performance. The results of finite element analysis show that the residual displacement angle and hysteretic energy of SMA joints are linearly related to the bearing capacity ratio of angle steel. Initial pre-strain can obviously improve the initial stiffness and ultimate bearing capacity and self-recovery performance of the joint, but it can not guarantee the ductility of the joint under the displacement angle between large floors.
【作者单位】： 同济大学土木工程防灾国家重点试验室;同济大学建筑工程系;
【基金】：曙光计划 十二五国家科技支撑计划课题(2015BAL03B01)
【分类号】：TU391
，
本文编号：2440492
本文链接：https://www.wllwen.com/jingjilunwen/jianzhujingjilunwen/2440492.html
