EQUIVALENT STATIC WIND LOADS ON LARGE SPAN ROOFS

摘要

Large span roofs are vulnerable to wind actions, and it is important to study equivalent static wind loads (ESWL)rnon these structures, which is convenient to be used during the structural design stage. ESWL of large span roofsrnis characterized as complex fluctuating wind loads, multimode dynamic vibration and multiple equivalentrnobjectives. In order to reflect these main characteristics, this paper presents a framework for evaluating ESWLrnon large span roofs. Wind-induced response and ESWL are divided into three components, including the mean,rnthe background and the resonant component. Ritz-POD method is employed to choose dominating vibrationrnmodes of wind-induced response. Load-response correlation method (LRC) combined with POD technique givesrnbackground component of ESWL in form of eigenmodes of fluctuating wind load. Resonant component ofrnESWL is formulated in terms of combination of inertial loads of dominating vibration modes. This methodrnrelates ESWL to main eigenmodes of fluctuating wind load and dominant vibration modes of wind-inducedrnresponse, and endows ESWL with more physical meanings. Based on this framework, ESWLs of single layerrnreticular dome shells are studied, and the results validate the proposed methods.