High performance steels for bridges (HSB), as adopted by the Korean Design Standard (KDS), having a yield strength greater than 350 MPa have recently been developed. Notably, HSB460, which has a minimum yield strength of 460 MPa, does not exhibit a yield plateau beyond yielding and exhibits strain hardening. Such characteristics could provide advantages by absorbing the greater strain energy of steel members and increasing the local buckling strength, which may help develop more economic bridge designs. However, the current KDS for compression members of steel tubular columns was established based on the results of axial load tests for conventional structural steel having yield strengths from 250 to 350 MPa, which exhibits a yield plateau. Three-dimensional finite element analyses adopting actual stress-strain curve of HSB460 were subsequently carried out to evaluate the buckling strength, by considering the ovality, welding residual stresses, and the cross-section sizes. It was confirmed that HSB460 steel tubular columns could have larger margins compared to the current KDS, primarily due to advantages from strain hardening with no yield plateau. As such, with regards to local buckling, the proposed design guidelines for HSB460 steel is expected to enable a more economic bridge design.

最近开发了韩国设计标准（KDS）所采用的，屈服强度大于350 MPa的高性能桥梁用钢（HSB）。值得注意的是，最小屈服强度为460 MPa的HSB460不会出现超出屈服的屈服平稳期，并且会出现应变硬化。通过吸收钢构件更大的应变能并增加局部屈曲强度，这些特性可以提供优势，这可能有助于开发更经济的桥梁设计。然而，基于对具有250至350 MPa屈服强度的传统结构钢进行轴向载荷测试的结果，建立了当前用于钢管柱压缩构件的KDS，该屈服强度表现出平稳性。随后，通过考虑椭圆率，焊接残余应力和横截面尺寸，采用HSB460的实际应力-应变曲线进行三维有限元分析，以评估屈曲强度。可以肯定的是，与目前的KDS相比，HSB460钢管柱具有更大的裕度，这主要归因于应变硬化的优势，且无屈服平稳。因此，关于局部屈曲，HSB460钢的拟议设计指南有望实现更经济的桥梁设计。主要归因于应变硬化的优势，没有屈服平稳。因此，关于局部屈曲，HSB460钢的拟议设计指南有望实现更经济的桥梁设计。主要归因于应变硬化的优势，没有屈服平稳。因此，关于局部屈曲，HSB460钢的拟议设计指南有望实现更经济的桥梁设计。