钢纤维混凝土板冲切强度及塑性解

Abstract

通过试验，探讨了钢纤维配筋混凝土简支方板的冲切性能，并采用塑性法分析了钢纤维混凝土板的极限强度，理论计算结果与实测值吻合良好.由于钢纤维的增强阻裂的作用，较之普通混凝土板，钢纤维混凝土板的冲切破坏呈现较大的延性，斜裂缝推迟产生，极限荷载得到提高.

SmAlGe was synthesized by arcmelting method and its crystal structure characterized by single crystal method.Crystallographic and reFined structure parameters: chemial Formula SmAlGe, Mr =250.0, orthorhombic,LaPtSi type,(109) I4 1 md, a =0.419 57(3) nm, c =1.458 8(2) nm, V =0.256 79(4)nm 3, Z =4, Dx =6.464 g/cm 3, μ =35.27 mm -1 ( λ MoK=0.071 07 nm), F (000)=428, T =296 K, R =0.030 and wR =0.025 For 12 reFined parameters and 120 contributing independent observed reFlections.The main bonding Feature of this structure is covalent bonding of Al Ge Forming three dimensional network.The Formula may be written as Sm 3+ Al 2- Ge 1- in the classical limit, and the compound may be reFered as “metallic Zintl phase".While in the YAlGe structure the Al Ge pseudo two dimensional zig zag network is characterized by transitional bonds between covalent and metallic.The geometrical Factor played an important role in atom packing.