钢-混凝土组合式自复位防屈曲支撑性能研究

PERFORMANCE OF THE STEEL-CONCRETE COMPOSITE WITH SELF-CENTERING BUCKLING-RESTRAINED BRACES

防屈曲支撑的滞回曲线饱满,但也存在卸载后构件残余变形大、安装防屈曲支撑的结构体系震后不易修复等问题。因此,文中提出一种新型的钢-混凝土组合式自复位防屈曲支撑,并对构件基于预应力筋的自复位机理进行了研究。首先介绍了自复位防屈曲支撑的钢-混凝土组合式构造方式以及预应力装置的组装方式,并以构件预应力筋的弹性模量为参数对自复位防屈曲支撑性能进行分析。结果表明减小预应力筋的弹性模量时,构件的残余变形会增大,但其滞回曲线会更饱满,即耗能能力越好。选择适当的设计参数,通过预应力筋能够实现钢-混凝土组合式防屈曲支撑的自复位功能,并同时具备很好的滞回耗能能力。

Though the buckling-restrained braces feature full hysteretic curves,the unacceptable residual drift may lead to difficult repair of buckling-restrained bracing frames after an earthquake.A new type of steel-concrete com⁃posite self-centering buckling-restrained braces was proposed,and the self-centering mechanism of components based on the prestressed tendons was studied.The steel-concrete composition of the self-centering buckling-re⁃strained braces(SCBRBs)and assembly methods of the prestressed components were described at first,and then the parameter analysis of the SCBRB was conducted.The elastic modulus of the self-centering tendons was respectively chosen as the analysis parameters.The results show that the residual deformation of the structural components will increase when the elastic modulus of the prestressed tendons is reduced,but the hysteresis curves will be fuller and the energy-dissipation capacity will be better.The self-centering ability of steel-concrete composite SCBRBs with the prestressed tendons can be achieved through the appropriate design parameters,and it has a good energy-dissi⁃pation capability.