粘弹性消能支撑的试验研究

Experimental research on damping of structure with energy dissipation brace

对空框架以及附加单向斜撑、小八字撑、小八字曲拐撑的4种结构进行自由振动试验和正弦稳态激振试验,比较这4种消能支撑的消能能力.在正弦稳态激振试验中,分别对这4种结构施加不同的柱端位移,测试其在不同频率下框架及阻尼器的力-位移滞回曲线,并进行比较分析.结果表明:附加粘弹性消能支撑后,结构整体刚度改变不大,阻尼有所增大;框架结构本身的消能能力有限;与单向斜撑和小八字撑相比,小八字曲拐撑有着较好的消能能力,更为有效地保护主体结构在地震中免遭破坏.

The natural vibration experiment and steady-state sinusoidal excitation experiment of the frames without energy dissipation braces and those with attached energy dissipation brace in forms of single inclined brace, double inclined braces, and double inclined toggle-braces were introduced, and their capa- bility of energy dissipation was compared to each other. In the latter experiment, different displacements were applied to the column end, the force-displacement hysteresis curves of the frames and their viscoelastic dampers were tested with different frequency. The result indicated that the stiffness of the structure changed a little but its damping and energy dissipation capability were increased, so that the brace protected the structure from destruction. In contrast, the energy dissipation capability of double toggle-brace was stronger than the other two kinds inclined braces that it deserved to be generalized into application.