基于风振舒适度的高层建筑生命周期费用模型

Human Comfort Performance based Life Cylcle Cost Model of High rise Structures Under Wind Load

摘要:

根据感知结构在风荷载作用下振动的人数所占比例，将超高层建筑舒适度性能水平划分为5个等级，并以结构水平振动加速度作为控制指标，建立了超高层建筑舒适度性能的评价方法.通过虚拟激励法进行频域分析，求得结构在随机风荷载作用下的响应特性，获得1次强风作用下结构各性能水平的可靠度；考虑工程场地可能出现的风荷载水平，得到建筑生命周期内各舒适度性能水平的可靠度；同时，根据投资收益准则，建立基于舒适度性能的超高层建筑生命周期费用模型；该模型可以考虑不同设计方案下的生命周期费用，并可依据生命周期费用最小原则进行投资决策，是基于性能的抗风设计的具体应用.利用该方法对某超高层建筑调频质量阻尼器(TMD)安装与否进行了投资决策，说明了本方法的适用性.

Abstract:

Based on the percentage of human perception of the vibration of the building under wind load, the human comfort performance of the building was classified into five levels. The maximum acceleration was adopted as the quantitative index of the performance. Pseudo excitation method was employed in the frequency domain analysis for the calculation of the reliabilities of each performance of the super tall building under random wind force. The randomness of the wind speed being taken into consideration, the failure probabilities of the human comfort levels were obtained for the whole life cycle. A failure model for the wind induced human comfort of super tall buildings was derived base on the cost effectiveness criterion. This model evaluated the life cycle cost of the different design schemes, which could help make design choice based on the minimum life cycle cost criteria. It is of great significance to the performance based wind resistant design. The proposed method was applied to the human comfort design choice of a super tall building with tuned mass damper (TMD) device to illustrate its effectiveness and applicability.