预压弹簧自恢复耗能支撑子结构抗震性能研究

对预压弹簧自恢复耗能支撑进行了低周往复加载试验及数值模拟分析，结果表明，二者滞回曲线吻合较好，自恢复耗能支撑具有稳定的旗形滞回特性、良好的耗能能力和复位能力。对自恢复耗能支撑分别通过刚接和铰接与结构组成的支撑子结构进行了抗震性能数值模拟分析。结果表明：铰接支撑子结构具有更好延性、更稳定旗形滞回性能、更高承载力，对自身残余变形具有更好的控制能力；刚接支撑受力性能受连接板传递弯矩影响较大，铰接支撑耗能能力是刚接支撑的1.4~2.3倍，对结构的耗能贡献比刚接支撑提高了34%~40%，铰接支撑最大残余变形为刚接支撑的25.5%，基本消除了残余变形。

Seismic performance research on substructures with pre-pressed spring self-centering energy dissipation brace

A series of low cyclic reversed loading tests and numerical simulation on the pre-pressed spring self-centering energy dissipation (PS-SCED) brace were carried out. Results indicate that the hysteretic curves of simulations on PS-SCED braces have good agreement with those of tests. PS-SCED braces exhibit stable flag-shaped hysteretic performance with good energy dissipation capacity and self-centering capacity. Seismic performance analyses of the PS-SCED braced substructures with rigid and hinged connections were carried out, and results indicate that the hinged braced substructure has better ductility, more stable flag-shaped hysteretic performance and higher bearing capacity, and has a better ability to control the residual deformations than the rigid connected braced substructure. The mechanical performance of rigid connected brace is greatly influenced by the passing moment of the connecting plate. The energy dissipation capacity of the hinged brace is 1.4-2.3 times of the rigid connected brace, and the energy dissipation contribution of the hinged brace to substructure has increased by 34%-40% compared with that of the rigid connected brace. The maximum residual deformation of the hinged brace is 25.5% of the rigid connected brace, which indicates that the residual deformations are eliminated by the hinged braces basically.