动力基础频变参数模型及设计  

Frequency Variable Parameters Model and Design of Dynamic Foundations

作　　者：王宏伟[1] 陈啸[1] 刘斌[1] 朱浮声[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004

出　　处：《建筑科学与工程学报》2008年第1期55-59,共5页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50474018)

摘　　要：为了改进现行动力机器基础设计理论模型,结合质量-弹簧-阻尼模型理论和半空间理论的特点,提出了更符合实际的频变参数模型。通过计算推导,获得了该模型的动力解答,进一步分析了模型的特征及其参数的影响;同时,指出现有质量-弹簧-阻尼定参模型在低频段低估了体系的动力响应,在高频段则过高地估计了体系的动力响应,频变参数模型的谐响反应频率与外扰力频率之间存在的差值不大。最后,针对原设计规范存在的不足,提出大而轻的基础形式是一种更值得推荐的设计方案。该文为动力基础设计规范的改进和完善提供了参考。In order to improve the theoretical model of the present dynamic machine foundation design, the characteristics of mass-spring-damper model and half-space model theory were combined, and a frequency variable parameters model with more accuracy was advanced. Through computational deduction, the dynamic solutions of the concerned model were obtained, and the model features and parameter effects were further analyzed. Meanwhile, authors pointed out that the dynamic response of the system was underestimated in low frequency domain, while overestimated in high frequency domain by the present mass-spring-damper parameter fixing model. Considering frequency variable parameters model, there existed a little differential value between harmonic response frequency and corresponding external excitation frequency. At last, according to the shortage of original design code, a design scheme with big and light foundations for the dynamic machines was recommended. It provids some feasible references for modification and improvement of the design code.

关 键 词：动力基础 频变参数 半空间 瞬态振动 

分 类 号：TU311.3[建筑科学—结构工程]