Preliminary Study On Comprehensive Evaluation Framework Of Joints Of Lightweight Steel Structure

In the process of promoting building industrialization and reducing energy consumption and CO₂emission of the construction industry,lightweight steel structures have been widely used in residential buildings,industrial buildings and post-disaster construction due to the fast construction,lightweight,short construction period,little environmental impact and good thermal performance.As the key point of the lightweight structure design,the analysis of the joint has become a research hotspot.The researchers,such as structural engineers,architects and project management engineers,have carried out the research on the mechanical properties of the joints,the characteristics of appearance,construction evaluation and cost analysis.However,current research don’t fully understand the importance and complexity of the joint of lightweight structures.The lack of cooperation methods and comprehensive evaluation methods in various disciplines leads to the failure of current design of lightweight structures.It is an obstacle to the improvement of current design level of lightweight structures.In view of this,this paper studies the comprehensive evaluation system of joint in lightweight structures.The main research contents are as follows:（1）to sort out the types and characteristics of joints in lightweight structures,to analyze various factors that affect the structure,appearance,economy and construction of the joints,and to lay a foundation for the comprehensive and systematic analysis of joints in lightweight structures.It is necessary to start with the analysis of all the factors and conclude the complete impact index of joints.（2）based on the finite element analysis,analytic hierarchy process and fuzzy comprehensive evaluation,a comprehensive,concise,scientific and operational lightweight steel structure joint evaluation system is established.Fuzzy comprehensive evaluation method is used to quantify all kinds of complex factors,and according to the weight coefficient,the indicators of different levels are aggregated and unified to get the final result.（3）to take two lightweight structures housing products with different joints developed by Southeast University as examples,the final evaluation results are calculated by the evaluation system,and the evaluation results can be used to improve the node system and to provide a solution to the lightweight structures design problem.Based on above research,this paper aims to provide scientific basis and application basis for the design,production,construction and application of lightweight steel structure buildings.