1.
In the presence of a crane, upper and lower column supports can be installed in the middle of the steel structure building, and upper column supports should also be added at both ends.
When the seismic fortification intensity reaches 7 degrees, the length of steel structure buildings should be greater than 120 meters; When the seismic fortification intensity reaches 8 or 9 degrees, the length of the steel structure building should be greater than 90 meters, and it is best to set up two upper and lower column supports within the middle one-third.
.
