层状地基对脉冲风洞天平基础振动特征影响分析  

Influence analysis of layered subsoil on vibration characteristics of balance foundation in the pulse wind tunnel

作　　者：朱宝龙[1] 李凯 林其[2] 于时恩[2] ZHU Baolong;LI Kai;LIN Qi;YU Shien(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010 [2]中国空气动力研究与发展中心,四川绵阳621000

出　　处：《地震工程与工程振动》2024年第6期125-137,共13页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(41672342)。

摘　　要：由于脉冲风洞天平基础在飞行器风洞试验中起支撑作用,为深入研究层状地基对天平基础振动特性的影响,推导了层状地基上天平基础在脉冲载荷作用下的阻抗函数,利用简化模型建立基础的动态响应方程,并将简化模型的动态阻抗函数与基础-地基系统的动态阻抗函数进行等效处理,求得层状地基上天平基础在脉冲风洞载荷作用下的动力响应,并通过数值模拟进行验证。研究结果表明:随着载荷频率的增大,基础的竖向振幅、水平向振幅和回转角度逐渐减小;荷载幅值的增大导致基础振动最大振幅增大,振动频率保持不变;地基剪切模量的增大导致基础振动最大振幅递减;基础尺寸的增大引起基础振动最大振幅和振动频率的明显下降。另外,基础的竖向振幅随基础层深比的减小而增大,而水平向振幅和回转角度随层深比的减小而减小;地基剪切波速的增大对竖向振幅的影响较小,而对水平振幅和回转角度的影响更为显著。Since the pulsed wind tunnel balance foundation plays a supporting role in aircraft wind tunnel tests,in order to deeply study the influence of the layered subsoil on the vibration characteristics of the balance foundation,the impedance function of the balance foundation on a layered subsoil under impulse load is derived.A dynamic response equation of the foundation is established by using a simplified model,and the dynamic impedance function of the simplified model is equated with that of the foundation-foundation system.The dynamic response of the balance foundation on the laminated foundation under impulsive wind tunnel loading is obtained and verified by numerical simulation.The results show that the vertical amplitude,horizontal amplitude and slewing angle of the foundation gradually decrease with the increase of the loading frequency.The increase of the loading amplitude leads to the increase of the maximum amplitude of foundation vibration,while the vibration frequency remains unchanged.The increase of the shear modulus of the foundation results in the decreasing of the maximum amplitude of foundation vibration.The increase of the foundation dimensions leads to the obvious decreasing of the maximum amplitude of foundation vibration and the vibration frequency.In addition,the vertical vibration amplitude of the foundation increases with the decrease of foundation layer depth ratio,while the horizontal vibration amplitude and slewing angle decrease with the decrease of layer depth ratio.The increase of foundation shear wave velocity has less effect on the vertical vibration amplitude,while the effect on the horizontal vibration amplitude and slewing angle is more significant.

关 键 词：脉冲风洞 层状地基 天平基础 振动特性 阻抗函数 

分 类 号：TU476[建筑科学—结构工程]