【摘要】 设计和实施支盘桩–土–高层建筑结构动力相互作用体系的振动台试验,再现框架结构和桩基的震害现象。通过振动台试验,研究相互作用体系的地震响应、支盘桩对结构体系的阻抗作用和单、双跨框架结构抗震性能的差异,对该体系的试验现象、基频、阻尼比、振型、位移反应和上部结构顶层加速度反应进行了计算和分析。结果表明:相互作用对结构的动力特性和地震反应均有较大的影响,支盘桩具有较好的抗压、抗拔和抗扭曲作用;相同工况时上海人工波激励下的结构最大位移反应比ElCentro波大,说明结构的破坏除与震级有关外,还与地震波的波形有关;双跨框架结构的抗震性能明显好于单跨,并与汶川地震中很多单跨教学楼倒塌的现象一致。研究结果对抗震设计和防灾减灾具有重要的研究意义。更多还原

【Abstract】 Shaking table test of dynamic interaction of squeezed branch pile-soil-high-rise structure system is designed and carried out,which reproduces the earthquake damage phenomenon of pile foundation and frame structure. The seismic response of dynamic interaction system,the seismic effects of squeezed branch pile and the difference of aseismic capability between single-span and double-span frame structure are studied based on the shaking table test. The test phenomenon,natural frequency,damping ratio,vibration mode,displacement response,acceleration response at the top of superstructure of the system are calculated and analyzed. The test results show that the influence of interaction on structural dynamic characteristics and seismic response is large, the resistant effects of compression,tension and torsion of squeezed branch pile are obvious,the aseismic capability of double-span frame structure is superior to that of single-span frame structure,which is good consistent with collapse phenomenon of many single-span buildings under Wenchuan earthquake. Maximal displacement of structure under excitation of the Shanghai artificial-wave is larger than that of El Centro wave under the same condition,which means the damage of structure not only is related to magnitude but also to the waveform of the seismic waves. The results will have important significance in aseismic design and prevention of seismic disaster.更多还原