方钢管再生混凝土长柱理论分析结构工程专业论文.docxVIP

Theoretical Theoretical Analysis of Recycled Aggregate Concrete-filled Square Steel Tube Long Column Author：ZhangDan Major：constructional engineering Supervisor：Du Xikai Abstract Recycled concrete．compared with natural concrete。has some characteristies：lOW bearing capacity,poor durability,brittleness and high water absorption．Composite structures，formed by steel pipes filled with recycled concrete，enable both materials to play their advantages and make up disadvantages，and provide a good solution to the growing problem of construction waste as well．Currently,more research lies in recycled concrete steel tubular short columns．while less in the long．When long columns are pressed．slenderness ratio and second．order effects should be taken into account．SO research results of short columns can not be directly used in the long ones； therefore．further research iS needed． 111is paper has designed and tested 24 recycled concrete square steel tube long columns under axial compression and bias load test．and respectively uses five domestic and foreign steel concrete specifications to calculate the ratio of capacity calculation value and test value of these specimens and other recycled aggregate concrete．filled square steel tube long column specimens．and finally draws the conclusion that the formula of the regulations”Technical Specification for Concrete Filled Steel Tubular Structure”CECS28：201 2 iS the closest to capacity calculation value of these specimens． Based on the experimental study,this paper uses ABAQUS finite element software to simulate 24 specimens and the simulated load．10ngitudinal cross．strain curve is consistent with the experimental results．On the basis of finite element analysis results， it draws specimen stress．strain curve．and analyzes the main factors affecting the beating capacity of recycled aggregate concrete filled square steel tube long columns； among them，the influence of recycled aggregate replacement ratio on bearing capacity value is less；with e