UNIVERSAL EQUIVALENT STATIC WIND LOADS FOR LONG-SPAN ROOFS IN TIME DOMAIN
Long-span roofs are characterized with multimode buffeting responses as well as multiple objectives for equivalent static wind loads.A new method of analyzing universal equivalent static wind loads in time domain is proposed.According to time domain displacement responses,a generalized restoring force was calculated.Then POD analysis was conducted to obtain the eigenmodes,dominating eigen-modes were selected as the basic vectors to express universal equivalent static wind loads.With constraint equations and weight factors,a least-squares method was employed for calculating the combination factors of these basic vectors.Universal equivalent static wind loads were obtained reflecting the characteristics of wind induced response,and to ensure the equivalent accuracy for key objectives.Finally,a long-span roof was considered to verify the validity and accuracy of this method.