【作者】 赵军；

【导师】 卜良桃； 王新夏；

【作者基本信息】 湖南大学 ， 建筑与土木工程（专业学位）， 2017， 硕士

【摘要】 活性粉末混凝土是一种稳定性良好的水泥基复合材料,它克服了普通混凝土抗拉强度低、极限延伸率小、性脆等缺点,具有超高的力学性质,优异的耐久性、较低的收缩和徐变性能。但是,型钢与RPC之间的黏结力较低,而RPC的超高强性质要求与型钢之间要有足够可靠的内力传递,为保证型钢与RPC之间内力的可靠传递,通常需要在沿型钢翼缘外侧或腹板布置一定数量的栓钉。我国两部现行行业规程都仅给出了设置栓钉的构造措施,对于带栓钉连接件型钢混凝土纵向抗剪承载力的设计计算,并没有明确的条文规定,目前国内学者开展了关于带连接件的型钢混凝土组合结构的剪力传递性能的研究,为相关条文的制定提供了一定的理论依据。本文设计了 5个带栓钉连接件的型钢活性粉末混凝土(RPC)短柱在单调荷载下的推出试验及1个自然黏结试件的对比试验,根据带栓钉连接件的型钢RPC构件的受力性能,在型钢的腹板处布置一定数量的栓钉连接件,在腹板和翼缘的一侧布置应变片以研究型钢应力分布,研究了带栓钉连接件的型钢RPC短柱的破坏形态、荷载滑移曲线、型钢应变曲线、抗剪承载力等内容。在试验结果的基础上,以非线性断裂力学思想为基础,通过断裂能推导出计算试件粘结锚固承载力的公式。最后通过实际试验时的荷载,约束,对带栓钉的型钢RPC进行ANSYS建立模型,运算。试验结果表明:带栓钉连接件的型钢RPC推出试件的破坏以RPC劈裂为主,和普通型钢混凝土试件的荷载-滑移曲线一样,大致可分为5个阶段,分别为无滑移段、滑移段、破坏段、荷载下降段及残余段。应力应变曲线也和普通型钢混凝土相似,在荷载较小时,型钢应变曲线成指数形式,在荷载较大时,由于栓钉剪切变形的影响,栓钉根部混凝土受局部承压作用,近栓钉位置的型钢应变会产生突变。最后本文通过ANSYS软件建立构件的模型,引用相关文献中有关RPC的本构关系和界面弹簧单元的本构关系,并且将模型适当的简化,使得模型更加符合实际的效果。结果表明ANSYS运行的结果和试件的实际加载结果较为相似,型钢的应力云图和应力曲线和实际相差不大,且破坏形式也和实际较为接近。将试验结果、计算公式和ANSYS建模结果分析比较,计算结果表明,以断裂能为基础推导出来的计算结果比试验值偏小,说明计算公式较为保守,可用于工程实际。更多还原

【Abstract】 Reactive powder concrete is a kind of cement-based composite material with good stability,it overcomes the defects of low tensile strength,low elongation and brittleness of the common concrete.It has high mechanical properties,excellent durability,low shrinkage and creep properties.However,the bond strength between steel and RPC is low,the high strength properties of RPC requires enough reliable internal force transfer between steel and section steel.In order to ensure the reliable transmission of internal force between steel and RPC,we should layout web in the steel flange surface or a certain number of stud.Our existing two industry rules are only given the construction measures of the stud.There are no rules for calculation of longitudinal shear capacity of steel reinforced concrete with stud.Although domestic scholars have carried out research on shear transfer behavior of steel reinforced concrete composite structures with joints,and they provide a theoretical basis for the formulation of the relevant provisions,in the existing research,the concrete strength grade is lower,and the RPC of super high strength performance is not necessarily applicable.Five ste el reinforced reactive powder concrete(RPC)short columns with stud connectors and one comparative steel reinforced concrete short columns without stud connectors on the surface of shape steel were statically tested to study failure mode,load slip curves,strain curves of steel,shear bearing capacity and other content of steel reinforced RPC short columns with stud connectors.Based on test results,this paper apply the theory of nonlinear fracture mechanics to calculating formula of the bearing capacity.The test shows that the failure mode of steel reinforced RPC take splitting failure as the main,and as the same as the load slip curves of ordinary steel reinforced concrete,the load-slip curve of specimens in this paper can be divided into five stages,they are no slip segment,slip segment,failure segment,load decline segment,residual segment.The strain curves of steels are similar to those of ordinary steel reinforced concrete,the strain curves of steel are in the exponential forms under the less load,when the load becomes larger,steel near the stud position will produce mutation because the deformation of stud connectors lead to the RPC under the local pressure.And the calculation results show that The formula to calculate results are conservative compared with the experimental results.更多还原