WELDED ASSEMBLY H-SECTION STEEL AND METHOD FOR MANUFACTURING WELDED ASSEMBLY H-SECTION STEEL

摘要

Provided is a welded assembly H-section steel which has a high degree of freedom in cross-section design of welded assembly H-section steel, has a high buckling resistance, and can exert a high vertical support force even with less steel material.　The welded assembly H-section steel is made of steel with a yield strength of 325 N/mm2 or more, and a length in the longitudinal direction: L, web height: H, flange width: B, flange thickness: tf, web thickness: tw, α defined as L/(H-tf), β defined as B/(H-tf), γ defined as tf/B, and δ defined as tw/tf satisfy the following conditions (1) to (8). H ≥ 400 mm ... (1); B ≥ 400 mm ... (2); H ≤ B ... (3); α 10 ... (4); B/16 tf H/4 ... (5); max{tf/3, H/37} tw min{tf, tf×δreq(γ=1/16)} ... (6); 1.0 ≤ β ≤ 1.6 ... (7); δ δreq ... (8), where δreq is defined by the following equation (9), and δreq(γ=1/16) indicates the value of δreq when 1/16 is substituted for γ. δreq = (2.58β - 1.12) + (17.2β² - 52.8β + 18.0) × γ ... (9)