How can the steel structure be divided into Liang Hezhu?
Both have in common is: on the one hand from the perspective of the conceptual design, in the earthquake when they want to appear first in frame beam or beam plastic hinges instead of frame column or shear wall, the so-called "strong column and weak beam" and "strong wall and weak beam"; on the other hand, from the angle of structure, both must meet the seismic structural requirements, specifically to the longitudinal steel frame beams and beams (including steel beam bottom and top beam) must meet the requirements of seismic anchorage length in the anchor into the mount, corresponding to the same level of seismic frame beams and beam stirrup spacing and diameter of encryption area requirements are the same.
Refers to the beam and shear wall are connected with both ends of the beam span ratio is less than 5 (see section 7.1.8 of the specific provisions of the "high regulation"); frame beam and frame column refers to both ends connected with both ends of the beam, or shear wall connected but not less than 5 higher than the cross beam.
The two are not the same, lies in the seismic design, allowing the beam stiffness is greatly reduced, in some cases it can even be allowed to quit the job, but the beam stiffness only allowed to reduce, and not allow it to withdraw from work, so the specification of secondary beam is not resting on the coupling beam however, secondary beams could take on the frame of the. General beam cross height is small (less than 5), with shear transfer, so the specification provides some of the beams and frame beam different in structure, is a requirement of coupling beams is encrypted and frame beam stirrup length can be divided into encryption area and non encrypted area, two is the reinforcement on the beam waist the made clear that "wall horizontal distribution reinforcement should be the waist beams through continuous beam configuration in the range when the beam section height pull; more than 700mm, the two sides of the longitudinal structure of reinforced beam is arranged along the high range (waist band) diameter should not be less than 10mm, the distance should not be greater than 200mm; cross ratio not more than 2.5 of the beam, the longitudinal structure of reinforced beams (on both sides of the waist band) area of the reinforcement ratio should not be less than 0.3%" and will be incorporated into the provisions of a strong, and waist reinforcement in beams as long as the "when the beam web height h W = 450mm, in the two side beams along the height of the longitudinal structure configuration should be reinforced, each side of the vertical reinforcement (not including the upper and lower beam reinforcement and erect steel) 0.1% of the cross-sectional area should not be less than the web section area of bhw, and the distance should be less than 200mm." And not a strong clause.
