Steel structure construction drawing review

Oct 16, 2021

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Several issues should be noted in the review:

 

1. The application of special-shaped column frame and frame shear. Based on the fact that jinan area is 6 degrees except for flat Yin area, the limit of 7 degrees is adopted according to Tianjin regulations, and all corresponding structures are adopted, with the height to width ratio of limbs <4, beam height ≥400mm, and load ratio slightly higher than tianjin standard no more than 11KN/m2.


2. About the short shear wall. There must be enough ordinary shear wall, accounting for about 50% of the earthquake-resistant overturning moment, when the height of the beam is higher than 5, according to the specification can be configured according to the frame beam, but it needs to strengthen the force inspection of the wall limb, the structure of the beam extending into the wall limb shall not be less than the structure of the beam.


3. Large space frame support system, pay attention to two aspects:

(1) The selection of conversion layer is reasonable, and high-level conversion needs to be discussed.

(2) The frame support joist cannot be converted to the bearing wall many times. Generally, the third beam is no longer designed as a joist when the second conversion is passed.


4. Lateral control: generally, it is used as post-pouring belt when basement has a skirt house, which can be moved to the side, but the transfer stiffness of the skirt house is guaranteed when the skirt house is larger. Generally, when there is 1/4 local no lateral limit around, it can be satisfied as long as there is this part strengthened.


5. Plate and column seismic wall system: single plate and column system is not allowed, must set up a certain seismic wall, but only the middle column outside the rest of the beam can also be considered not plate and column system.


6. The rules and irregularities of the system are completely in accordance with the requirements of the code, pay attention to the eccentric problem.


7. Systems cannot be mixed.


8. The internal frame can not be a single row of internal column internal frame.


9. The bottom frame brick house must meet the seismic requirements of the vertical and horizontal directions, need to bear their respective seismic forces, and must meet the transverse wall spacing.

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