江 浩,徐龙河
AuthorsHTML:江 浩，徐龙河
AuthorsListE:Jiang Hao,Xu Longhe
AuthorsHTMLE:Jiang Hao，Xu Longhe
Unit:北京交通大学土木建筑工程学院，北京 100044
Unit_EngLish:School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China
Abstract_Chinese:为验证利用组合碟簧复位、摩擦装置耗能的自复位耗能支撑(DS-SCEDB)工作性能，对一根长为 1.6 m 的 DS-SCEDB 构件进行了拟静力试验，研究了其拉压对称性、耗能以及复位能力，并建立能够考虑初始残余变形的支 撑分段简化模型．采用 LS-DYNA 有限元软件，对该恢复力模型进行二次开发，对比分析支撑有无初始残余变形两 种情况下 DS-SCEDB 钢框架的抗震性能．结果表明，DS-SCEDB 具有稳定且饱满的旗形滞回，复位性能良好，初 始残余变形仅为支撑长度的 0.05%且不随加载幅值增大而增大，加载位移为 12 mm 时其受压恢复力和受拉恢复力之 比为 1.06，具有良好的拉压对称性．分段简化模型与试验得到的滞回曲线吻合程度较高，在地震荷载输入下也能较 为准确地预测支撑的旗形滞回，恢复力模型预测值和试验值最大相对误差为 8.44%．在设计地震激励下，DS\u0002SCEDB 钢框架的最大层间位移角不超过 1.89%，残余位移角小于 0.09%．在 DS-SCEDB 有、无初始残余变形两种情 况下，支撑框架结构层间残余位移角相近，层间位移角沿高度分布趋势相同，并且均满足规范限值要求．震后结构 塑性发展程度低，结构塑性变形耗能平均占比分别为 4.14%和 3.62%．支撑因装配精度和构造尺寸产生的初始残余 变形对结构的复位性能和抗震性能几乎没有影响．
Abstract_English:In order to validate the performance of the disc-spring self-centering energy dissipated brace(DS\u0002SCEDB)with combined disc springs to provide a self-centering behavior and friction devices to provide energy dissi\u0002pation，a DS-SCEDB specimen with a total length of 1.6 m was tested under quasi-static load to study the symmetry in tension and compression，energy dissipation and self-centering behaviors. Moreover，a simplified piecewise model that can consider the initial residual deformation is established. The secondary development of the restoring force model of DS-SCEDB is carried out based on LS-DYNA software，and the seismic performance of the frames using the DS-SCEDBs with or without initial residual deformation is analyzed. Results indicate that the DS-SCEDB exhibits full hysteretic responses with stable energy dissipation and excellent self-centering capabilities. The residual deformation of the DS-SCEDB is only 0.05% of the length and does not increase with the increase of loading ampli\u0002tudes. The ratio between the restoring force in compression and the restoring force in tension is 1.06 when the loading displacement is 12 mm，which indicates that the brace has good symmetry in terms of tension and compression. The hysteretic responses predicted by the proposed simplified piecewise model have a good agreement with the experimen\u0002tal results，and the flag-shaped hysteretic behavior of the brace under seismic loads can also be accurately portrayed，the maximum relative error between calculation and experimental results is 8.44%. Under the design basisseismic excitations，the maximum interstory drift ratio of steel frames with DS-SCEDBs does not exceed 1.89%，and the maximum residual drift ratio is less than 0.09%. In the two cases of the DS-SCEDBs with or without initial residual deformation，the residual interstory drift ratios of braced frame structures are almost the same. The interstory drift ratios have the same distribution trend along the height，and all meet the requirements of the specification limits. The degree of plastic development of the frames is low after the earthquake，and the average proportions of the energy dissipation provided by the plastic deformation of the frames are 4.14% and 3.62%，respectively. Therefore，the ini\u0002tial residual deformation of the braces due to assembly accuracy and component dimensions has little effect on the self-centering and seismic performances of the braced frames.
Keyword_Chinese:支撑钢框架；自复位性能；恢复力模型；滞回特性；拟静力试验；残余变形
Keywords_English:braced steel frame；self-centering performance；restoring force model；hysteretic behavior；quasistatic test；residual deformation

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