及有限元参数化分析

为研究实腹式型钢混凝土(SSRC)十字形异形柱的抗震性能,对4个不同轴压比、配钢率、加载方向的SSRC十字形异形柱进行了低周反复加载试验,分析了各试件的破坏形态、滞回性能、骨架曲线、位移延性.试验结果表明:当剪跨比较大时,试件发生弯曲破坏;试件的滞回曲线比较饱满;位移延性系数均大于3,破坏位移角在1/28~1/16之间.采用ANSYS对试件进行有限元分析,考虑型钢与混凝土之间的粘结滑移,分析比较了轴压比、配钢率及加载方向三个参数对试件承载力及延性的影响,有限元分析结果与试验结果吻合较好.试验及有限元分析均表明:SSRC十字形异形柱具有良好的延性、塑性变形能力,可以应用于高抗震设防烈度区的多高层建筑中.

Experimental Study and Parametric Analysis on Seismic Behavior of Solid-Web Steel Reinforced Concrete Cross-Shaped Column

The seismic behavior of solid web steel reinforced concrete (SSRC) cross shaped column was investigated through low cycle reversed loading experiment of 4 column specimens with various axial compression ratios, steel ratios and loading directions. The failure process and pattern, load displacement hysteretic curve and skeleton curve of columns together with ductility were analyzed. The experimental results show that the failure mode of SSRC specimens with large shear span ratio is bending failure. The hysteretic curves are relatively plump. The displacement ductility coefficients are larger than 3. The drift ratios vary from 1/28~1/16. Furthermore a finite element analysis (FEA) considering the interfacial bond slip between steel and concrete was carried out to simulate the influence of different parameters including axial compression ratio, steel ratio and loading direction on SSRC bearing capacity and ductility. The numerical analysis results agree well with the experimental results. FEA and Test results indicate that SSRC have favorable ductility and plastic deformation, and can be adopted in the construction of high rise buildings in high seismic fortification zones.