Research On Mechanical Properties And Local Optimization Analysis Of Single-layer Cable-suspended Photovoltaic Support

With the rapid development of photovoltaic power generation industry,in response to the new development concept of “Carbon Peakand,Carbon Neutrality” in China,distributed photovoltaic power generation projects that are not constrained by site conditions have better application pros pects than large photovoltaic power plants.Different from the traditional rigid photovoltaic support,the single-layer cable-suspended photovoltaic support structure,as a new structural form,uses prestressed cables instead of the traditional beam-purlin system to fix and support photovoltaic panels,and then transfers the load to the lower supports and foundations on both sides.Single-layer cable-suspended photovoltaic support has obvious advantages in large-span areas that the traditional photovoltaic supports can’t meet,such as strong adaptability,beautiful structure,high space utilization rate and economy.At present,the projects of flexible photovoltaic supports at home and abroad are still in the initial stage with little theoretical research.There are a lot of problems to be solved urgently.In order to fully grasp the static and dynamic performance of the structure and the stress state of local joints.The main work of this paper is as follows:(1)The finite element models of single-layer cable-suspended flexible photovoltaic support were established by using SAP2000 finite element software,and the static performances of the whole structure were studied when the single-layer cable-suspended flexible photovoltaic support and photovoltaic modul es act together.Through the parameters of photovoltaic module size,cable pre-tension,steel frame spacing and photovoltaic module support form,the variation rules of the static performances of the structure with each parameter were studied.(2)The basic dynamic characteristics of the whole structure of single-layer cable-suspended flexible photovoltaic support were studied,and the influence of the lower steel frame on the dynamic performance of the structure was analyzed,and the variation rules of the natural vibration characteristics of the whole structure under different parameters were compared.Then,the appropriate seismic waves were selected,and the dynamic responses of the structure under different dimensions of earthquake waves were studied by time history analysis method.(3)The local entity modeling analysis of the lower horizontal force bearing joints in the single-layer cable-suspend photovoltaic support were carried out by using ABAQUS finite element software,and the stress analysis of t hree types of joints were carried out according to the method of first whole and then local;For the optimal beam-column-tie-rod joints,some optimization measures were put forward,such as adding stiffeners and reducing the grade of high-strength bolts at beam-column joints,so that the tie-rod stress,side column stress and the maximum stress of high-strength bolts are reduced by 47.2%,14.1% and 19.9% respectively.Then,the size of the joint is optimized,and the amount of steel used in the structure is reduced by 25.5% after optimization.