CAJ | 학술논문

近海风力发电结构是由无限域地基、基础及上部结构组成的体系，有限域透射人工边界和地震动输入模式直接影响结构体系的动力响应。首先，建立透射人工边界-地基-基础-塔筒结构和固定边界-地基-基础-塔筒结构的有限元模型；然后，简要澄清了透射边界地震动输入之所以采用外力而不采取地震动物理量（加速度、速度和位移）的原因所在；最后，对给出的3种作用模式：（1）固定边界地震动输入，（2）只考虑外源输入波作用，（3）同时考虑外源输入波和内源振动的散射波作用，分别进行计算分析和比较。通过数值计算并结合理论分析，（1）澄清了对透射边界采用外力进行地震激励输入的方法的原因，这种输入方法合理可靠，符合实际情况；（2）在地震波等效荷载的生成中，针对圆形横截面地基提出了一种阻尼力、刚度力的便捷性生成方法，大大减小了工作量；（3）从自身振动特点及阻尼设置角度，解释了地震作用下采用透射边界比采用固定边界时风电结构响应减小的原因；（4）指出了地震作用下透射边界地基模型在结构动力响应与倒塌计算中内源振动反射的不容忽视性。
근해풍력발전결구시유무한역지기、기출급상부결구조성적체계，유한역투사인공변계화지진동수입모식직접영향결구체계적동력향응。수선，건립투사인공변계-지기-기출-탑통결구화고정변계-지기-기출-탑통결구적유한원모형；연후，간요징청료투사변계지진동수입지소이채용외력이불채취지진동물리량（가속도、속도화위이）적원인소재；최후，대급출적3충작용모식：（1）고정변계지진동수입，（2）지고필외원수입파작용，（3）동시고필외원수입파화내원진동적산사파작용，분별진행계산분석화비교。통과수치계산병결합이론분석，（1）징청료대투사변계채용외력진행지진격려수입적방법적원인，저충수입방법합리가고，부합실제정황；（2）재지진파등효하재적생성중，침대원형횡절면지기제출료일충조니력、강도력적편첩성생성방법，대대감소료공작량；（3）종자신진동특점급조니설치각도，해석료지진작용하채용투사변계비채용고정변계시풍전결구향응감소적원인；（4）지출료지진작용하투사변계지기모형재결구동력향응여도탑계산중내원진동반사적불용홀시성。
Offshore wind power structure is the system of superstructure-foundation-infinite domain soil. Dynamic response of structure system is directly affected by transmitting boundary of the model and seismic motion input mode. Firstly, finite element models of tower tubes-foundation-soil-transmitting boundary and tower tubes-foundation-soil-fixed boundary are established. Then, the reason why force instead of acceleration, velocity and displacement is used for seismic input in the model while transmitting boundary is briefly clarified. At last, the following modes are analyzed, i.e. (1) seismic input of fixed boundary;(2) external source wave motion is considered only; (3) external source wave motion and scattering force caused by endogenous oscillation are both considered. Analysis results show that: (1) the reason why force is used for seismic motion input in the model with transmitting boundary is clarified;and the method of seismic motion input is in accord with the actual situation;(2) a convenient method of the generation of stiffness force and damping force is proposed for the foundation of circular cross-section;and it can greatly reduce the workload;(3) the reason that dynamic response of offshore wind power structure is smaller using transmitting boundary than using fixed boundary is explained from the viewpoint of vibration characteristics of model and the damping; (4) the indispensability of endogenous oscillation in seismic response and failure modes of structure using transmitting boundary is pointed out.