新型切口厚壁钢管耗能支撑抗震性能研究及参数分析  

SEISMIC PERFORMANCE AND PARAMETER ANALYSIS OF A NOVEL ENERGY-DISSIPATION BRACE WITH NOTCHED THICK-WALLED STEEL TUBE

作　　者：郑国足[1,2] 韩建平 ZHENG Guo-zu;HAN Jian-ping(School of Civil Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou,Gansu 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《工程力学》2024年第9期201-213,共13页Engineering Mechanics

基　　金：甘肃省重点研发计划项目(22YF7GA161);国家自然科学基金项目(51578273);教育部长江学者和创新团队发展计划项目(IRT_17R51);甘肃省科技计划项目(20JR5RA439)。

摘　　要：为了解决现有金属耗能装置连接复杂或容易发生非预期破坏等问题,提出了一种新型切口厚壁钢管耗能支撑(energy-dissipation brace with notched thick-walled steel tube,EDB-NTWST)。该支撑主要依靠首次提出的切口厚壁钢管(notched thick-walled steel tube,NTWST)耗能,震后仅需更换NTWST即可完成修复,因而可提高结构震后修复速度。针对切口厚壁钢管的不同布置方式,给出了两种支撑的构造形式,并推导了NTWST简化力学分析方法。通过试验研究,验证了理论计算及数值模拟的准确性。采用参数化分析方法,设计了16个NTWST试件,在单调加载和循环荷载下分别对其进行了有限元分析。结果表明:EDB-NTWST的滞回曲线饱满,变形能力强,延性高,可将损伤集中于NTWST上,能够实现可重复使用的目标;简化力学分析方法与试验结果吻合较好,可用于EDB-NTWST的初步设计;NTWST的力学性能能够通过调整其设计参数进行改变,承载力的提高可通过加大耗能环厚度来实现,增加耗能环的数量可以显著提高其变形能力,增加耗能环的宽度并减小中径,是提高NTWST延性的有效方法。A novel energy-dissipation brace with a notched thick-walled steel tube(EDB-NTWST)was proposed to solve the problems of complex connections or unexpected damage in existing metal energy-dissipating devices.The EDB-NTWST was designed to dissipate energy through a notched thick-walled steel tube(NTWST),which was proposed for the first time.Only the damaged NTWSTs need to be replaced rather than the entire brace after a major earthquake,which is beneficial for rapid post-earthquake restoration.Two structural configurations of the EDB-NTWST were presented based on different configurations of the NTWST.A simplified mechanical analysis method for the NTWST was derived.The accuracy of the theoretical analysis and numerical simulation was verified by experimental investigation.The parametric study on 16 NTWST specimens based on finite element analysis was conducted under monotonic and cyclic loads.The results show that the EDB-NTWST exhibits full hysteresis curve,excellent deformation capacity and high ductility.In addition,the damage is concentrated on the NTWST and the goal of reusability is achieved.The analytical prediction and experimental data agree well with each other.This indicates that the simplified mechanical analysis method is reliable and can be applied to the preliminary design of EDB-NTWSTs.The mechanical properties of NTWSTs can be adjusted by changing their design parameters.For instance,the thickness of the energy-dissipation ring can be increased to enhance the bearing capacity,while increasing the number of energy-dissipation rings can significantly improve the deformation capacity.Additionally,widening the energy-dissipation ring and reducing its middle diameter are effective for enhancing the ductility of NTWST.

关 键 词：切口厚壁钢管 耗能支撑 抗震性能 试验研究 有限元分析 ABAQUS 

分 类 号：TU352.1[建筑科学—结构工程]