EQUIVALENT STATIC WIND LOADS ON LONG SPAN ROOFS
The equivalent static wind loads (ESWL) provide an effective approach to deal with the spatiotemporally varying wind loads for structures with long span roofs. Two schemes for calculating the ESWL have been proposed in this paper. In the first scheme ESWL are formulated in terms of a weighted combination of modal ESWL components. In the second scheme ESWL are expressed in a separated form as the resonant component of modal ESWL and the background component in which the proper orthogonal decomposition (POD) technique can be introduced to simplify the computation of load-response-correlation. The modal coupling effects are considered with the weighting factor in both schemes. Wind tunnel tests of a single-layer latticed cylinder were carried out with the synchronous multi-pressure scanning technique. With the wind-induced responses of the cylinder calculated using approaches of the Complete Quadratic Combination (CQC) and the Square Root Sum of Square (SRSS), it is found that the modal coupling effects may be neglected in this case, and the responses can be obtained with only a few modes. The obtained responses by ESWL are checked by CQC. By comparing the two schemes for calculating ESWL, it can be concluded that the first scheme is an effective and practical method for analysis of the equivalent static wind loads, and the second scheme is useful to investigate background and resonant static loads component respectively.