CAJ | 학술논문

针对动力场天然无限地基的数值模拟与地震波输入问题进行了一些有意义的研究，评述了现有动力计算常用无限元的优缺点，详细阐述了ABAQUS无限元理论体系框架，并加以改进，提出一种考虑外域地震动影响的ABAQUS动力无限元人工边界。采用等效边界力的叠加原理，对入射波和散射波分开处理，视入射波和散射波在边界上互不影响，将输入地震动转化为作用于有限元无限元交界面上的等效应力的方法来解决外源波的入射问题。算例验证结果表明：内源振动和固定边界会出现失真和扰动现象，同时该计算结果与黏弹性边界的计算结果对比可知，该方法对外行散射波的过滤作用优于黏弹性边界。因此，改进的ABAQUS动力无限元人工边界理论方法有效且具有一定的稳定性。
침대동력장천연무한지기적수치모의여지진파수입문제진행료일사유의의적연구，평술료현유동력계산상용무한원적우결점，상세천술료ABAQUS무한원이론체계광가，병가이개진，제출일충고필외역지진동영향적ABAQUS동력무한원인공변계。채용등효변계력적첩가원리，대입사파화산사파분개처리，시입사파화산사파재변계상호불영향，장수입지진동전화위작용우유한원무한원교계면상적등효응력적방법래해결외원파적입사문제。산례험증결과표명：내원진동화고정변계회출현실진화우동현상，동시해계산결과여점탄성변계적계산결과대비가지，해방법대외행산사파적과려작용우우점탄성변계。인차，개진적ABAQUS동력무한원인공변계이론방법유효차구유일정적은정성。
Some valuable studies have been done in the aspects of numerical simulation of natural infinite foundation and seismic wave input. The thesis comments the advantages and disadvantages of infinite element, and expatiates on the theory system of ABAQUS infinite element which is improved. The artificial boundary of ABAQUS dynamic infinite element considering the impact of outland fluctuations is proposed. Based on the equivalent boundary force superposition principle, the incident and scattered waves are dealt with separately, and assumed that they are independently to each other. The input ground motion is converted to equivalent stress acting on the interface between the finite element and infinite element to solve the problem of exogenous incident wave. Case study results show that:for the calculation results obtained from inside vibration source and the fixed boundary, the distortion and disturbances appear;the results calculated by the method mentioned above are compared with the results of viscoelastic boundary, which make it certain that the filter function of outgoing scattered wave with the method mentioned above is better than viscoelastic boundary. Therefore, the improved ABAQUS dynamic infinite element boundary method is effective and has certain stability.