strain-hardening steel

Meantime, combined the flexural carrying capacity ultimate state characteristic of concrete thin-walled box girder, when the strain of longitudinal steel at tensile region firstly arrives at 0.01, the ultimate flexural capacity calculated formula and designed formula of concrete thin-walled box girder has been obtained.

同时，结合混凝土薄壁箱梁抗弯承载力极限状态下的特点&以受拉区钢筋应变达到0.01为标志，推导得出了混凝土薄壁箱梁抗弯极限承载力计算公式和设计公式。

The steel tube whose longitudinal tension strain is the biggest has no confinement effect on core concrete.

纵向受拉最大点的钢管对核心混凝土没有套箍作用。

The steel frames began to buckle under the strain.

钢架在重压下开始变形。

AFRP reinforcement have two characteristics of short-term mechanical behavior compared to steel bars: ( 1) Tensile stress-strain curve is close to a straight line and have no yielded point;

与传统的预应力钢筋相比，AFRP筋材的短期力学特性主要有：（1）应力-应变关系近于直线，没有屈服点；

It was pointed out that in tensile test with specimen of C-grade casting steel, the load-halt method or the judgment from the pointer swing of strain instrument could not give clearly the yield point except the graphical analysis method.

指出测定C级钢拉伸试样屈服点时，用载荷停顿法或指针法，屈服现象不明显，只有图解法可一次测出未知屈服指标。