In most of researches on soil-structure systems, it is assumed that the foundation is bonded to the ground where no foundation uplift is allowed. Uplifting makes changes in force–displacement behavior of the soil-structure systems, which in turn alters structural demands. In this research, a set of non-dimensional parameters is considered which controls the behavior of uplifting systems. The effects of foundation uplift on response of soil-structure system are investigated parametrically through time history analysis for a wide range of systems subjected to harmonic excitation and also ground motions recorded on soft soil with predominant period. It is seen that the response of systems with more dominant soil-structure interaction effects will influenced more by foundation uplift. It is shown that the period of soil-structure systems to the predominant period of ground motion has an important rule on the response of uplifting systems. While this period ratio is greater than one, the total displacement of uplifting soil structure systems almost equals to elastic soil-structure system when uplifting is prevented but the drift of the structure as a part of soil-structure system while uplifting is permitted decreases in comparison with corresponding systems which foundation uplift is prevented. If the period ratio becomes smaller than one, systems which are allowed to uplift experience larger displacements in comparisons with corresponding case which foundation uplift is prevented. It is shown that neglecting the influence of foundation uplifting in seismic performance assessment procedure of stiff and squat structures located on soft soil is not conservative, because in this situation structures can experience larger drift due to foundation uplift in comparison with the case that uplifting is prevented while subjected to excitation with long predominant period. Also for nonlinear soil-structure systems it is shown that foundation uplifting and soil yielding can reduce the ductility of the structure as a part of soil structure system. It is observed that traditional structures with longer period of vibration which are designed based on conventional spectra will be influenced less by foundation uplifting and soil yielding.

在大多数关于土壤-结构系统的研究中，都假定地基粘结在不允许地基隆起的地面上。隆起改变了土壤-结构系统的力-位移行为，从而改变了结构要求。在这项研究中，考虑了一组控制提举系统行为的无量纲参数。通过时程分析，对受谐波激励作用的各种系统以及主要周期在软土上记录的地震动进行了时程分析，从参数上研究了地基隆起对土壤-结构系统响应的影响。可以看出，具有更大支配性的土壤-结构相互作用系统的响应将受到基础抬升的更多影响。结果表明，土壤结构系统的周期到主要的地面运动周期对提升系统的响应有重要的规定。当该周期比大于1时，在防止隆起的情况下，隆起的土壤结构系统的总位移几乎等于弹性土壤-结构系统，但在允许隆起的情况下，该结构作为土壤-结构系统的一部分的漂移相比减小了使用相应的系统可以防止基础抬升。如果周期比小于1，则与防止基础隆起的相应情况相比，允许隆起的系统将经历更大的位移。结果表明，在软土地基上的刚性和蹲式结构的抗震性能评估过程中，忽略基础隆起的影响并不保守，因为与防止隆起的情况相比，在这种情况下结构会因基础隆起而经历较大的漂移长时间处于激发状态。同样对于非线性土壤-结构系统，研究表明基础抬升和土壤屈服会降低结构的延性，作为土壤结构系统的一部分。可以看出，基于常规频谱设计的具有较长振动周期的传统结构受地基抬升和土壤屈服的影响较小。因为在这种情况下，与在较长的主要周期内受到激励而防止隆起的情况相比，由于基础隆起，结构可能会出现较大的漂移。同样对于非线性土壤-结构系统，研究表明基础抬升和土壤屈服会降低结构的延性，作为土壤结构系统的一部分。可以看出，基于常规频谱设计的具有较长振动周期的传统结构受地基抬升和土壤屈服的影响较小。因为在这种情况下，与在较长的主要周期内受到激励而防止隆起的情况相比，由于基础隆起，结构可能会出现较大的漂移。同样对于非线性土壤-结构系统，研究表明基础抬升和土壤屈服会降低结构的延性，作为土壤结构系统的一部分。可以看出，基于常规频谱设计的具有较长振动周期的传统结构受地基抬升和土壤屈服的影响较小。同样对于非线性土壤-结构系统，研究表明基础抬升和土壤屈服会降低结构的延性，作为土壤结构系统的一部分。可以看出，基于常规频谱设计的具有较长振动周期的传统结构受地基抬升和土壤屈服的影响较小。同样对于非线性土壤-结构系统，研究表明基础抬升和土壤屈服会降低结构的延性，作为土壤结构系统的一部分。可以看出，基于常规频谱设计的具有较长振动周期的传统结构受地基抬升和土壤屈服的影响较小。