新型自恢复耗能支撑框架结构抗震性能分析
Seismic Performance Analysis of New Self-Centering Energy Dissipation Braced Frame Structure

提出了一种新型支撑构件――预压弹簧自恢复耗能支撑(PS-SCEDB)，对其构造形式及自恢复原理进行了 介绍，并对采用预压弹簧自恢复耗能支撑和普通防屈曲支撑(BRB)的 20 层 Benchmark 钢框架结构的抗震性能进行 了对比分析．结果表明，在具有不同 PGA 的 3 种地震波作用下，与 BRB 框架结构相比，PS-SCEDB 框架结构层间 位移角峰值、有效值及基底剪力均减小．此外，PS-SCEDB 框架结构残余变形相比原钢框架结构减小了 80%，相比 BRB 框架结构减小了 50%，且 PS-SCEDB 具备良好的耗能能力和自恢复性能．
A new type of bracing device，pre-pressed spring self-centering energy dissipation brace(PS-SCEDB)，is proposed in this paper ， and the configuration and self-centering mechanics of this system are described. Furthermore，using a 20-story benchmark steel frame structure as numerical example，comparisons of the seismic performances between structure with PS-SCEDBs and structure with buckling restrained braces(BRBs)are conducted. Results indicate that the peak interstory drift，the normed interstory drift，and the base shear of frame structure with PS-SCEDBs are all obviously reduced compared with those of structure with BRBs due to three kinds of earthquake records with different PGAS. Additionally，the residual deformations of frame structure with PS-SCEDBs are reduced by 80% compared with the original frame structure，and 50% compared with the frame structure with BRBs， and the PS-SCEDB system exhibits full hysteretic performances with good energy dissipation capacity and selfcentering behavior