钢筋铁尾矿砂混凝土受力性能及设计方法研究

Aiming to promote comprehensive utilization of ferrous mill tailings, this project is planed to study mechanical properties and design methods of reinforced ferrous mill tailings concrete. Ferrous mill tailings concrete is formed through replacing natural sand aggregate of concrete with ferrous mill tailings. The contents of this project are as foloowings: (1) based on steel bar pullout experiments from ferrous mill tailings concrete and comparison with bar pullout experiments from common concrete, the bonding and anchoring mechanism of steel bars in ferrous mill tailings concrete will be revealed.Then, the steel bars' anchorage requirement in ferrous mill tailings concrete will be put forward. (2) Series tests of reinforced ferrous mill tailings concrete simply supported beams under flexture loading will be carried out to study concrete cracking mechanism, cracks width, cracks spaces and fluxture displacement properies.Simultaneously, common reinfored concrete beams tests are excuted for comparison. Then, the calculation methods of fluxture stiffness,crack width and crack spaces of this type beams are mapped out. (3) series tests of reinforced ferrous mill tailings concrete columns under lateral loading along with various axial compressive ratio will be carried out to study seismic behaviour, including seismic strength,ductility and energy dissipating capacity, of this type of columns. (4) Through elastic-plastic time-history response analyses on reinforced ferrous mill tailings concrete frame structures, the deformation capacity requirement in such frame structures, and seismic design methods to achieve these required deformation capacity will be put forward. The research results of this project can reveal the mechanical mechanism, improve the design approach and calculation methods, of reinforced ferrous mill tailings concrete components and structures, aiming to provide technical support for the wide application of ferrous mill tailings in reinforced concrete structures.

用铁尾矿砂代替混凝土中的天然砂可称为铁尾矿砂混凝土。本项目以提高铁尾矿综合利用为目标，对钢筋铁尾矿砂混凝土的受力性能及设计方法进行研究。本项目:（1）通过钢筋在铁尾矿砂混凝土的拔出试验并与钢筋在普通混凝土中的拔出试验对比，揭示钢筋与铁尾矿砂混凝土的粘结与锚固机理，提出钢筋在尾矿砂混凝土中的锚固要求；（2）通过钢筋铁尾矿混凝土梁受弯试验，研究其受弯裂缝开展与变形性能，提出该类梁的弯曲刚度与裂缝宽度计算方法；（3）通过不同轴压比情况的钢筋铁尾矿砂混凝土柱在水平往复荷载作用下的试验，研究钢筋铁尾矿砂混凝土柱抗震强度与延性性能；(4) 通过钢筋铁尾矿砂混凝土框架结构的弹塑性时程反应分析，提出该类框架结构的变形能力需求以及达到所需变形能力的抗震构造措施。本项目的研究成果可揭示钢筋铁尾矿砂混凝土构件与结构的受力机理，完善其设计理论和计算方法，为铁尾矿砂在钢筋混凝土结构中的广泛应用提供技术保障。

用铁尾矿砂代替天然砂制备的混凝土可称为铁尾矿砂混凝土。本项目以提高铁尾矿综合利用为目标，对钢筋铁尾矿砂混凝土的受力性能及设计方法进行研究。本项目(1)通过钢筋在铁尾矿砂混凝土的拔出试验并与钢筋在普通混凝土中的拔出试验对比，揭示了钢筋与铁尾矿砂混凝土的粘结性能，给出了钢筋在铁尾矿砂混凝土中粘结滑移曲线；(2)通过钢筋铁尾矿混凝土简支梁受弯试验，研究了其受弯裂缝开展与变形性能，提出了该类梁受弯承载力、短期刚度与裂缝最大宽度计算方法；(3)通过不同轴压比的钢筋铁尾矿砂混凝土柱在水平往复荷载作用下的试验，研究了钢筋铁尾矿砂混凝土柱抗震承载力与延性性能；(4) 通过钢筋铁尾矿砂混凝土短柱轴心受压性能试验，探讨了钢筋铁尾矿砂混凝土短柱轴压的破坏形态，给出箍筋约束铁尾矿砂混凝土短柱轴压承载力计算公式；(5) 通过铁尾矿砂混凝土棱柱体抗拉试验，得到了铁尾矿砂混凝土受拉应力-应变曲线及铁尾矿砂混凝土受拉峰值应变和混凝土受拉弹性模量；(6)通过铁尾矿砂混凝土四点受力等高变宽梁的受剪性能试验，得到了铁尾矿砂混凝土受剪破坏形态，探讨了不同强度等级的铁尾矿砂混凝土抗剪强度与变形性能。.本项目的研究成果揭示了钢筋铁尾矿砂混凝土基本力学性能，得到了钢筋铁尾矿砂混凝土构件受压、受弯和压弯受力机理，提出了相应的设计理论和计算方法，为铁尾矿砂在钢筋混凝土结构中的广泛应用提供技术保障。