基于剩余使用年限的结构生命周期性能设计方法

基于概率理论结构设计的基本目的是使结构在预定的使用期内满足设计所预期的结构可靠性,包括安全性、适用性、耐久性。影响结构可靠性的荷载效应(直接或间接作用引起的结构的各种内力)与结构抗力(指结构承受荷载和变形的能力)因受到各种因素的影响,都是随时间或空间而变动的随机函数。在目前的超高层建筑结构的设计过程中,有关是否需要考虑作用及抗力的时变性能以及如何考虑的规定十分笼统。为了更加明确考虑时变性能在结构设计中的影响,在引入剩余使用年限的基础上提出了基于剩余使用年限的结构生命周期性能设计方法。并以一个超高层建筑为例,阐述了其具体应用,为今后工程中基于时变性能的结构设计提供参考。

A STRUCTURAL DESIGN METHOD OF LIFE-CYCLE PERFORMANCE BASED ON THE REMAINING SERVICE LIFE

The purpose of structural design method based on probability theory is to make sure the structure in a predetermined period meet the expected structural reliability,including safety,serviceability and durability. Load effects( including various internal force caused by direct or indirect effects) and structural resistance( including the ability to withstand the load and deformation) due to various factors are random function that are changed with time or space. In the current design process of high-rise building structures,whether to consider the time-dependent performance of effects and resistance and how to consider have no specified requirements. In order to solve it,an innovative method based on the remaining service life is proposed in this paper. A super tall building is taken as an example to illustrate the specific use of the proposed structure design method.