Therefore, even if it is a grade IV steel bar, its strength design value can only reach 360N/mm? (the same as grade ⅲ steel bar), but when it is used for axial tension and small eccentric tension members, it can only be 300N/mm? Take it. Therefore, the anchorage length of steel bars higher than Grade III can be determined according to Grade III steel bars.
Extended data
According to the code for seismic design of buildings, the size of concrete structural members should be reasonably selected, and longitudinal reinforcement and stirrup should be arranged to avoid shear failure before bending failure, concrete collapse before yielding of reinforcement, and anchorage and bond failure of reinforcement before member failure.
The bottom reinforcement of the upper plate of the column without column cap should overlap the anchorage length of the longitudinal reinforcement 2 times away from the column, and the end should have a hook perpendicular to the plate. The main reinforcement and waist reinforcement of the building beam with seismic wall at the bottom frame should be anchored in the column according to the requirements of tensile reinforcement, and the anchorage length of the upper longitudinal reinforcement of the bearing in the column should meet the relevant requirements of reinforced concrete frame-supported beam.
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