Research On Wind Load And Wind-induced Response Of Structure Of Long Span Roof

Recent years, large span roof structures are extensively adopted in public places internal and overseas. This kind of structure has two characters, light mass and small damping. It is always in low atmospheric boundary layer, its wind-induced vibration response is very marked and its wind disaster occurred frequently, so the wind-resistant research and design of this kind of structure become more and more urgent. But the data about its location and whole structure's dynamic wind load is quit little in structure wind load code, and the theory study is in groping phase. In this paper, the wind tunnel test of large span roof structures' dynamic wind loads have been discussed systematically, the modal decomposition method and time domain method, which was combined with the result to calculate the wind-induced vibration responses and equivalent static wind loads of (non-large-deformation) large span roof structures are also studied at the same time, and some engineering-valuable conclusions are summarized.Firstly, the characteristic of interaction between wind and the structure of long-span roofs are simply reviewed. In chapter two, the rigid modal wind is introduced and the characteristic of wind pressures on long span roofs is also investigated. Then in chapter three, the wind-included response of structure of long span roofs are calculated and the mode contribution factor and the cumulate mode contribution factor are proposed to identify the mode which contributes greatly to the wind-induced vibration response and judge the reasonability of the computing modes. In chapter four, the theoretic of the structure of long-span roofs are introduced and the traditional methods to solve the equivalent static wind load of the structure of long-span roofs are ameliorated. At last, the primary conclusions are summarized and further work is prospected.