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钢结构抗爆炸或耐冲击设计时,大应变率下钢材的实际性能十分重要。特别地,大应变率下屈服应力大幅提高,可能对钢结构的动力特性产生重要影响。以往主要研究了加强筋、板材、热轧型材等钢材的高应变率性能。旨在补充对冷弯空心型钢的大应变率性能的认识。对采用两种不同冷成型工艺(直接成型和连续成型)制成的4个冷弯矩形空心截面(RHS)型钢进行了研究。为研究RHS试件的动态性能,对分离式霍普金生压杆(SHPB)型钢进行了166次张拉和压缩试验,应变率范围为100~1 000s-1,将其动态屈服应力与静态屈服应力进行了比较,研究荷载作用下冷弯方管强度的提高程度。
Steel structure anti-explosion or impact-resistant design, the actual performance of steel at high strain rates is very important. In particular, a significant increase in yield stress at high strain rates can have a significant impact on the dynamic behavior of the steel structure. In the past, we mainly studied the high strain rate performance of steel such as stiffeners, plates and hot rolled sections. Aiming to complement the understanding of the large strain rate performance of cold-formed hollow sections. Four cold-formed rectangular cross-section (RHS) sections made of two different cold forming processes (direct and continuous forming) were studied. In order to study the dynamic performance of RHS specimens, the split Hopkinson bar (SHPB) beam was subjected to 166 tensile and compression tests with a strain rate range of 100-1 000 s-1. The dynamic yield stress and static state Yield stress were compared to study the strength of cold-formed square tube to enhance the degree of load.