摘要
为提高装配式钢结构梁柱节点的抗震性能,首先通过熔融共混法制备高阻尼性能纳米偏高岭土/氟橡胶(Nano-metakaolin/Fluororubber,NMK/FKM)复合材料,并对该新型材料进行4种频率下的动态力学性能试验和静态力学试验,然后以NMK/FKM纳米复合材料为核心耗能材料,对所提出的直角型黏弹性阻尼器进行ABAQUS有限元模拟分析。研究结果表明:当频率为1.5 Hz时,NMK/FKM纳米复合材料宽阻尼温域和TA值皆达到峰值,该工况下材料的阻尼性能最佳;直角型黏弹性阻尼器表现出刚度随位移幅值的增大而增大的动力特性;当频率为0.5、1.0和1.5 Hz时,阻尼器滞回特性表现出非线性特征,当频率升至2.0 Hz时,滞回特性则为线性。随着黏弹性材料层厚度的增大,滞回环面积、阻尼器刚度和最大阻尼力逐渐减小;随着高跨比的增大,阻尼器耗能性能提升。通过调整阻尼器的高跨比和阻尼材料层厚度,可以进一步提高直角型阻尼器的动态响应。
To improve the seismic performance of beam-column joints of assembled steel structures,nano-metakaolin/fluororubber(NMK/FKM)composites with high damping performance were first prepared in this study by melt blending method,and then dynamic and static mechanical properties of the new material were tested at four frequencies.Taking NMK/FKM nanocomposites as the core energy dissipation material,a simulation analysis of the right-angle viscoelastic damper proposed in this paper was performed using finite element software ABAQUS.Results show that when the frequency is 1.5 Hz,the wide damping temperature range and TA value of NMK/FKM nanocomposites reach the peak,demonstrating the best damping performance of materials.The stiffness of the right-angle viscoelastic damper increases with the displacement amplitude.The hysteretic performance of the right-angle viscoelastic damper shows nonlinear characteristics under frequencies of 0.5,1.0,and 1.5 Hz;when the frequency rises to 2.0 Hz,the hysteresis performance shows linear characteristics.The hysteresis loop area,damper stiffness,and maximum damping force gradually decrease as the thickness of viscoelastic material layers increases.The energy dissipation performance of the damper is improved as the height-span ratio increases.The dynamic response of the right-angle damper is further enhanced by adjusting the height-span ratio of dampers and the thickness of damping materials.
作者
许俊红
朱哲雨
李爱群
XU Junhong;ZHU Zheyu;LI Aiqun(School of Civil Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,China;School of Civil Engineering,Southeast University,Nanjing 210096,Jiangsu,China;School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《地震工程学报》
CSCD
北大核心
2022年第6期1345-1356,共12页
China Earthquake Engineering Journal
基金
北京建筑大学大型多功能振动台阵实验室重点课题(2022MFSTL02)
江苏省自然科学基金(BK20180776)
住房和城乡建设部科学技术项目(2018-K9-068)。
