CAJ | 학술논문

采用整体有限元法分析土-结构动力相互作用（SSDI）下网架的动力性能。以大型有限元软件ABAQUS为平台，结合FORTRAN程序实现粘弹性动力人工边界精确施加、土体自重应力平衡及粘弹性边界条件下地震动输入，并通过算例验证有限元计算过程的有效性与合理性；建立地基土-支承体系-网架屋盖相互作用的三维整体模型，分析SSDI对网架结构动力性能影响。研究表明，SSDI使网架结构自振周期较刚性地基下延长且地基土越软周期越长，网架结构自振频率随地基土变软更密集；SSDI使基础底面峰值加速度较自由场地表峰值加速度增大5％！30％，且地基土越软增大幅度越大；SSDI效应可增大网架结构节点加速度及节点水平相对位移，且使网架结构节点水平相对位移随地基土的变软逐渐增大。
채용정체유한원법분석토-결구동력상호작용（SSDI）하망가적동력성능。이대형유한원연건ABAQUS위평태，결합FORTRAN정서실현점탄성동력인공변계정학시가、토체자중응력평형급점탄성변계조건하지진동수입，병통과산례험증유한원계산과정적유효성여합이성；건입지기토-지승체계-망가옥개상호작용적삼유정체모형，분석SSDI대망가결구동력성능영향。연구표명，SSDI사망가결구자진주기교강성지기하연장차지기토월연주기월장，망가결구자진빈솔수지기토변연경밀집；SSDI사기출저면봉치가속도교자유장지표봉치가속도증대5％！30％，차지기토월연증대폭도월대；SSDI효응가증대망가결구절점가속도급절점수평상대위이，차사망가결구절점수평상대위이수지기토적변연축점증대。
A grid structure ’s dynamic performance considering soil-structure dynamic interaction (SSDI )was analyzed using the integral finite element method.ABAQUS and FORTRAN programs were adopted to realize applying accurately viscoelastic artificial boundaries,developing the geostatic procedure for obtaining stress equilibrium state of soil self-weight and ground motion input under viscoelastic artificial boundaries.A numerical example was used to verify the validity and rationality of finite element calculation process.Then,a three-dimensional finite element integral model was established to analyze the effect of SSDI on a grid structure's dynamic performance.The integral model consisted of a grid dome,a support structure and foundation soil.The results showed that the natural periods of the grid structure are longer with soil layer becoming softer considering SSDI,and its natural frequencies become more intensive compared to the rigid foundation assumption;the peak acceleration of foundation bed increases 5% !30% compared to the free field peak acceleration,and the softer the soil layer the higher therising level;furthermore,the node acceleration and horizontal relative displacement of the grid structure increase considering SSDI,and the node horizontal relative displacement of the grid structure increases gradually with soil layer becoming softer.