钢管再生骨料混凝土柱的基本力学性能及抗震性能研究

Utilize of building waste is one of the important aspects of building industry. Anti-seismic property of structures is one of the key problems of structural safety. This project focuses on the research of columns, filled with recycled concrete aggregates and confined with steel tubus, which stand for a new material structure. The practical purpose of the research is the high value utilize of waste concrete aggregates. Based on the research foundation obtained up to now, the research work of this project includes the optimal selection of gemetic and material parameters, the analysis and test of basic mechanical properties, the analysis of anti-seismic property, the analysis of nonlinear calculation model of steel tubular columns filled with recycled aggregates. The research results will give out the rules of optimal selection for gemetric and material parameters, revel the strength, stiffness, viscosity property, strain and fracture modes. The effects of geometric and material parameters on load bearing capacity, stiffness and duribility of recycled aggregate columns confined with steel tubes will be presented. Both the stress distribution of steel tube as well as concrete and the interaction of them will also be studied in this project. The power dissipation and damping characteristic of the recycled aggregate columns under seismic action will be studied. The calculation method of stiffness of steel confined recycled aggregate columns will be presented. the performance index of the columns will be given in quantity. The perpose of the research work is provide theoretical basis for anti-seismic design of recycled aggregate columns confined with steel tubes.

建筑废弃物利用是建筑业节能减排的一个重要方面，结构的抗震设计是结构安全的核心问题之一。本项目的研究对象为一种再生材料结构，即废旧混凝土填充的钢管柱结构体系，其重要特点是废旧混凝土高附加值再生利用。在现有研究基础上，开展钢管再生骨料混凝土柱材料和几何参数的优选原则研究、基本受力性能分析和试验研究、抗震性能研究、非线性计算模型分析等。给出钢管再生骨料混凝土柱材料和几何参数的优选原则，研究钢管再生骨料混凝土柱的强度、刚度、滞回特征、应变和破坏模式等性能，研究各几何参数、材料参数等对钢管再生骨料混凝土柱承载力、刚度和延性等的影响，研究钢管和再生骨料混凝土的应力状态以及其相互作用，研究钢管再生骨料混凝土柱在地震作用下的耗能性能和阻尼特性，分析钢管再生骨料混凝土柱不同受力阶段的刚度计算方法，定量分析钢管再生骨料混凝土柱的性能指标，为钢管再生骨料混凝土柱结构的抗震设计提供理论依据。

建筑废弃物的再利用是节能减排的一个重要内容和领域。项目研究了再生骨料混凝土材料及混凝土柱的基本力学性能、FRP约束混凝土柱的力学性能、橡胶改善混凝土及橡胶改性再生骨料混凝土材料的动态力学性能及优缺点；用万能抗震试验机对钢管再生骨料混凝土柱这类组合构件进行了拟静力低周往复加载试验, 探讨了组合构件及其材料的抗震性能及宏观损伤、精确建模及受力性能分析，研究其在地震荷载作用下的破坏机制和特征、滞回性能、耗能能力、变形能力、承载能力和刚度退化特征等抗震性能，考察了含钢率、钢管强度和轴压比三个参数对其抗震性能的影响及其规律，研究组合构件在地震作用下的耗能性能和阻尼特性，分析了组合构件在不同受力阶段的刚度计算方法，定量分析组合构件的力学和抗震性能指标。对钢管再生混凝土柱的非均匀轴向受压进行了精确建模与有限元仿真，通过分析轴向均匀和非均匀受压条件下的力学性能，构建了组件的三维模型，给出了均匀轴压、非均匀的轴压和偏心轴压的轴向力分布图；并通过万能试验机的试验和仿真技术对钢管再生混凝土柱的力学响应进行分析，验证了所建模型的有效性；预研和创新开发了钢管再生混凝土柱三维变形的非接触式检测装置。成果为建筑废弃物再利用提供了一个新的理论方法和应用途径。