埋置框架的横向动力特性研究  

Transversal Dynamic Characteristics of Frame Embedded in Soil

作　　者：朱斌[1] 陈仁朋[1] 陈云敏[1] 王宏志[1] 

机构地区：[1]浙江大学岩土工程研究所,杭州310027

出　　处：《振动工程学报》2002年第4期425-429,共5页Journal of Vibration Engineering

摘　　要：提出了一种求解埋置于分层土中的框架结构受侧向瞬态荷载作用时的动力响应的简单方法。通过与其它方法比较可知 ,它具有良好的精度和稳定性。这种方法的桩周土模型采用 Winkler假定 ,它将框架结构的各梁柱单元联结起来 ,从而求得整个结构的动力响应。通过动力分析评价了不同形式的框架结构的动力特性 ,参数研究揭示了框架结构的刚度、框架材料与土的刚度比、冲击力作用时间以及荷载作用位置等因素对框架结构横向振动的影响。由于它克服了传统的静力法不能考虑结构的惯性力以及土的粘滞阻尼和动刚度的缺点 。Adopting Winkler assumption, a simple approach is developed for the flexural response analysis of the framed structure embedded in layered soil under horizontal transient excitation. Good agreement between two computed results validates the present approach. The dynamic response of the frame is obtained by coupling the beams and the piles. The dynamic characteristics of various frames are evaluated through dynamic analysis. Parameter studies reveal the influences of the slenderness ratio of the pile, the pile soil stiffness ratio, the duration of the impact load and the position of the load. The traditional static method can not consider the inertial force of the structure, the dynamic stiffness and the viscous damping of the soil, therefore, the present approach is more suitable for engineering practice.

关 键 词：桩基础 框架结构 横向振动 动力特性 

分 类 号：TU473.1[建筑科学—结构工程]