体育场主看台弧形挑篷风振响应分析的极坐标法

根据体育场主看台弧形挑篷的风荷载和振型函数特点,提出并建立了极坐标下计算主看台弧形挑篷风致振动响应的方法。以一实际体育场主看台弧形挑篷为例,根据风洞试验获得的该结构挑篷的非定常风压,用ANY SY时程方法、CQC频域方法和本文方法计算了其风振响应。结果表明,本文方法有足够的工程精度,比在直角坐标下描述荷载分布特性和响应特性有优势。

Polar coordinate method for wind induced dynamic responses of arc grandstand-roofs of large stadiums

Based on the characteristics of wind loads and modal shape of grandstand arc roofs of large stadiums,a polar coordinate method for wind induced dynamic response analysis is proposed in this paper.The arc grandstand-roof of a real large stadium is then taken as an example to verify the accuracy of the presented method.With the non-steady wind pressure distributions on the roof obtained from a wind tunnel test,its dynamic responses are computed with the well-known ANSYS software in time domain,and CQC method in frequency domain and the polar coordinate method.The computed results indicate that the polar coordinate method developed in this paper has satisfied accuracy for practical purpose,and it has the great advantages over the traditional analytic method associated with the rectangular coordinate in the aspects of describing the behaviours of wind loads and dynamic responses.