垂直循环类停车设备的风致响应简化分析

Analysis and Research on Wind-induced Response of Vertical Circulating Mechanical Parking System

垂直循环类停车设备(vertical circulating mechanical parking system,VCMPS),是一种具有广阔应用前景的创新型机械式立体停车库结构,风荷载是VCMPS设计环节中的主要控制荷载。为提高车容量,大型城市中,VCMPS的应用呈现向高柔结构发展的趋势。然而,当前对其设计通常仅考虑第一阶振型对结构响应的贡献,低估了结构的风致响应,进而影响了结构的设计和稳定性;另一方面,基于时域或频域的结构响应分析较为繁琐,难以满足设计人员的简便性需要。为了尽可能合理且高效地对VCMPS进行抗风设计,针对VCMPS的风致响应简化分析开展研究。在现有规范基础上,进一步考虑更高阶振型对结构响应的贡献,实现对VCMPS风荷载标准值的合理确定,从而相对精确且快速计算VCMPS的结构风致响应。最后,将研究应用于一座9层VCMPS。结果表明:通常考虑前两阶振型的贡献,可大幅度提高该类VCMPS风致响应的计算精度,该方法可借鉴用于一般VCMPS的风致响应分析。

Vertical Circulating Mechanical Parking System(VCMPS)is an innovative mechanical parking System with broad application prospects,and wind load is the main control load in its design process.In order to increase vehicle capacity,the application of VCMPS in large cities is showing a trend towards high flexible structures.However,the current design typically only considers the contribution of the first mode of vibration to the structural response,underestimating the wind-induced response of the structure,thereby affecting its design and stability.On the other hand,structural response analysis based on time or frequency domain is relatively cumbersome and difficult to meet the simplicity needs of designers.In order to carry out wind resistant design of VCMPS as reasonably and efficiently as possible,research is conducted on simplified analysis of wind induced response of VCMPS.On the basis of existing specifications,further consider the contribution of higher-order vibration modes to the structural response,and achieve a reasonable determination of the wind load standard value of VCMPS,so as to calculate the wind-induced response of VCMPS relatively accurately and quickly.Finally,the study will be applied to a 9-story VCMPS.The results indicate that considering the contribution of the first two vibration modes can significantly improve the calculation accuracy of the wind-induced response of this type of VCMPS.This method can be used as a reference for the wind-induced response analysis of general VCMPS.