| The large-span spatial steel structure is significant to temperature effect because of high-order hyperstatic,which leads to a certain difference of strength and stability between the design state and the operational state.To ensure the resistance redundancy of the spatial steel structure,it is necessary to study the temperature effects.Three sections including the mechanism of spatial steel struc ture,force pattern classification of structural members,and key components recognition based on strength and stability will be studied.The details are as follows :The measured temperature data is modified by considering the influence of solar radiation on the temperature of steel components,the method of determination of the refined non-uniform temperature field in different regions is proposed by obtaining the temperature effect of rods in spatial steel structure based on the fixed search radius optimization mode.Moreover,the forcing mechanism of the spatial steel structure under non-uniform temperature fields is revealed through considering the two aspects of structural design and actual service status,setting uniform and non-uniform temperature effects,comparing uniform and non-uniform temperature effects.The mentioned methods above are verified by the measured temperature field of the Shenzhen Bay Sports Center.The building data set of stresses and the first stage classification method are proposed to divide rods into main rods of axial stress,bending stress,and shear stress.Furthermore,the second stage classification method is designed to build the response fluctuation evaluation index of stress variation coefficient according to the response under the different temperature situations.Finally,the method of classification of member force modes of tensile stress,compressive stress,and tensile/compressive stress is suggested,and the member force mode of the steel structure of Shenzhen Bay Sports Center is given to reveal the influence of ambient temperature and closing temperature on the member force mode.A key components recognition method based on strength and stability is proposed.Firstly,taking both the effect of long-term temperature and short-term temperature effect into consideration,the characteristic moment temperature situations are extracted.Then,the tensile stress mode member is designed based on the stress,stress amplitude,maximum value,and the intensity characteristic quantity of the standard deviation,while the maximum stress,intensity characteristic of amplitude,maximum stability index,and intensity characteristic of stability are considered in the compressive stress mode member.The key component classification method based on hierarchical clustering is used to classify the key components of the steel structure of Shenzhen Bay Sports Center. |
