超高层强外框(筒)结构风致响应灵敏度分析

Sensitivity analysis of wind-induced response for strong outer frame or tube structural system of super high-rise building

超高层强外框(筒)结构是一种加强外框而弱化内筒或只有内框的新型结构体系,为研究其风致响应对结构外框(筒)和内框(筒)构件的敏感性,以该结构体系为分析对象,针对强外框(筒)结构所涉及的结构构件类型,运用基于虚功原理和功能转换关系建立的结构自振周期和风致响应显式表达式,推导了响应和周期关于构件截面尺寸参数的灵敏度计算公式。将该灵敏度计算方法应用于强外框(筒)体系的案例分析,结果表明:该方法计算结构固有周期和风致响应灵敏度的精度较高;结构自振周期、顶部位移和层间位移角对外框(筒)构件截面参数较为敏感,验证了强外框(筒)体系设计思想的合理性。

Super high-rise strong outer frame tube structure is a new structural system with strengthened outer frame tube and weakened inner tube(or with only the inner frame inside).In order to study the sensitivity of the wind-induced response to the outer frame tube and the inner frame tube members,the structural system was taken as the analysis object,aiming at the types of structural members involved in the strong outer frame tube structure,the virtual work principle and the functional transformation relationship were used to establish the explicit expressions of the natural vibration period and the wind-induced response,and the sensitivity calculation formulas for response and period with respect to component section size parameters were derived.The sensitivity calculation method was applied to the case study of the strong outer frame tube system.The results show that the method’s calculation accuracy of the natural vibration period and wind-induced response sensitivity of the structure is high.The natural vibration period,top displacement and inter-story drift ratio are sensitive to the cross-section parameters of the outer frame tube members,which verifies the rationality of the design of the strong outer frame tube system.