(1. School of Civil Engineering，Hefei University of Technology，Hefei，Anhui 230009，China；2. Key Laboratory for Disaster Reduction in Civil Engineering，Tongji University，Shanghai 200092，China)
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.
