【摘要】 以风敏感度概念为基础,对结构风敏感度计算理论中的若干关键问题进行探讨,并对相关计算方法进行改进,推导了背景效应系数、耦合效应系数以及系统应变能等公式。以单层柱面网壳结构为研究对象,系统研究了跨度、杆件截面、矢跨比、约束形式等参数对结构风敏感度的影响,建立了单层柱面网壳结构风敏感度分级体系。研究发现:单层柱面网壳结构风敏感度主要受结构刚度和振动模式的影响,实际设计中可通过结构自振基频、矢跨比和约束形式三个参数来判断;以结构自振基频等于1.5 Hz作为分界线,小于该值时结构共振响应较大,需进行结构动力分析,大于该值时结构以背景响应为主,据此提出了以背景响应为基础的简化风致振动计算方法。更多还原

【Abstract】 Based on the conception of wind-sensitivity,some key issues of wind-sensitivity theory were discussed in this thesis,and the calculation algorithm of wind-sensitivity was improved.The coefficient of background response effect,coefficient of coupling effect for background and resonance response and calculation formula of strain energy were defined and deduced theoretically.The influence of span,cross-sectional area,rise-span ratio and boundary conditions on the wind-sensitivity of cylindrical shells was studied systematically.Then,the classification system for the wind sensitivity of cylindrical shells was established.The study indicates that,the wind-sensitivity of cylindrical shells is mainly affected by the stiffness and vibration mode,which are expressed by structural basic frequency,rise-span ratio and boundary conditions.When the structural basic frequency is smaller than 1.5Hz,the resonant response can’t be omitted.When the structural basic frequency is larger than 1.5Hz,the wind-induced responses can be calculated by simplified algorithm that merely considers the background response.更多还原