拉索预应力球面网壳的风振性能研究

针对拉索预应力球面网壳在风荷载作用下的动力响应做了系统分析.介绍了拉索预应力球面网壳的结构特点以及风振分析的频域方法,分别从拉索设置、预应力数值的角度比较了其与常规球面网壳在动力特性上的差异.通过大量的算例,分析和考察了布索方式、预应力数值、结构跨度、矢跨比以及屋面荷载等参数对拉索预应力球面网壳风振性能的影响.计算结果表明,拉索预应力球面网壳的风振效应敏感性比普通球面网壳要小,且风振系数分布均匀.

Study on wind-induced dynamic behaviours of pretensioned spherical latticed shells

Deals with the dynamic responses of pretensioned spherical latticed shells (PSLS) under wind loads. Basic structural characteristics of PSLS and a frequency-domain method for their wind-induced vibration analysis were introduced. Structural dynamic properties of PSLS were compared with those of conventional spherical latticed shells in the aspects of layout of tendons and magnitude of pretensioning forces. Wind-induced dynamic behaviors of PSLS relating with some important structural parameters, including layout of tendons, magnitude of pretensioning forces, span, rise-span ratio and roof load, were analyzed in detail. The results indicated that the sensitivity of dynamic response of PSLS to turbulent wind is less than that of conventional spherical latticed shells, and that the distribution of nodal wind-induced dynamic coefficients is even on the whole.