基于不同剪跨比的生态复合墙体抗震性能及受剪承载力分析

THE SEISMIC PERFORMANCE AND SHEAR CAPACITY ANALYSIS OF ECO-COMPOSITE WALL BASED ON DIFFERENT SHEAR SPAN RATIO

通过1/2比例内填秸秆泥坯砌块生态复合墙体(ECW-4)的低周反复荷载试验,研究其破坏形态、承载能力、变形、延性、耗能等抗震性能,并在前期试验研究的基础上,对不同剪跨比的生态复合墙体抗震性能进行对比分析;针对不同剪跨比墙体建立非线性有限元模型,对其破坏模式及受剪承载力进行分析。结果表明:随着剪跨比的增大墙体受剪承载力下降明显,但变形能力及耗能能力有所提高;基于合理破坏模式(剪切型破坏)提出剪跨比的合理取值范围(1.0≤λ≤1.8);并提出基于不同剪跨比的生态复合墙体极限受剪承载力修正公式,其计算结果与试验值的误差较小,满足工程精度要求。

A group of 1/2 scale model of ecological composite wall with straw mud billet block was tested under low- frequency cyclic loading. The seismic performance of the specimen, such as failure mode, shearing capacity, deformation, ductility, energy dissipation and so on, was mainly researched. And the seismic performance comparative analysis of the ecological composite wall with different shear span ratio was made base on the pre- experimental study. A non-linear finite element model was established to analyze its failure mode and shear capacity with different shear span ratio. The results showed that with the increase of the shear span ratio, the shear capacity of wall was decreased significantly, but deformation capacity and energy dissipation capacity were increased. Based on reasonable failure mode（ shear type failure） the rational value ranges （1.0 ≤ λ ≤〈 1.8 ）about shear span ratio were put forward, and the ultimate shearing capacity modified formula for eco-composite wail based on different shear span ratio was proposed. The error of calculation results was small is compared with test value, which satisfied the engineering precision.