CAJ | 학술논문

为研究邻近结构对土-结构体系动力特性的影响,基于弹性相似律,制作了框架结构在刚性基础( RF)、单一结构土-结构相互作用( SSI)和结构-土-结构相互作用( SSSI)的缩尺模型。采用脉冲激励方法识别出三个模型的频率、模态和阻尼比,并与原型有限元计算结果相比较。实验和数值计算结果表明：相应于SSI体系的模态,SSSI体系的模态成对出现,两阶模态的频率接近而相位相反,且SSI体系相应模态的频率位于这两阶频率之间；由于相邻结构的影响,SSSI体系基础的竖向位移和倾覆转角进一步加强。
위연구린근결구대토-결구체계동력특성적영향,기우탄성상사률,제작료광가결구재강성기출( RF)、단일결구토-결구상호작용( SSI)화결구-토-결구상호작용( SSSI)적축척모형。채용맥충격려방법식별출삼개모형적빈솔、모태화조니비,병여원형유한원계산결과상비교。실험화수치계산결과표명：상응우SSI체계적모태,SSSI체계적모태성대출현,량계모태적빈솔접근이상위상반,차SSI체계상응모태적빈솔위우저량계빈솔지간；유우상린결구적영향,SSSI체계기출적수향위이화경복전각진일보가강。
Based on the elasticity similitude law, three scaled models, including a frame structure with rigid foundation (RF), soil-structure interaction ( SSI) with only one structure and structure-soil-structure interaction ( SSSI) , were constructed to investigate the effects of neighborhood structures on the dynamic characteristics of the soil-structure system. Then, the impulse excitation method was used to identify the frequencies, mode shapes, and damping ratios of the three models. All of the identified parameters were com-pared with those of prototypes by the finite element method. Test and numerical results show that there are two natural modes of SSSI, whose frequencies are close but phases are opposite corresponding to each mode of SSI. Moreover, the natural frequency of SSI will be in the interval of the corresponding two frequencies of SSSI. The vertical and rocking displacements increase in the SSSI system due to the effects of neighborhood structures. The scale factors of frequencies between prototypes and models agree with the similitude law.