The steel frame support connections of the multi-story steel structure building can be welded or high-strength bolted connections.

The longitudinal column support arrangement of the plant shall meet the following requirements:

The longitudinal column-to-column support should be placed near the middle of the column;

The longitudinal column-to-column support may be disposed in the same open space and penetrated up and down between the columns;

The horizontal horizontal support of the roof and the inter-column support of the top layer should be arranged in the same column between the ends of the plant unit; when the plant unit is long, it should be set between every 3~5 columns.

When the horizontal stiffness of each frame is large and the vertical support is irregular, the horizontal support of the floor shall be set according to the requirements of Table 6.2.1. The structure shall comply with the following requirements:

The horizontal support may be provided at the bottom of the secondary beam, but the end of the support rod shall be connected to the longitudinal direction of the floor, the web of the beam and the lower flange of the beam;

The horizontal support of the floor should be arranged in coordination with the vertical support position;

The beam of the floor axis can be used as the chord of the horizontal support system, and the angle between the slanted rod and the chord is between 30° and 60°;

When the secondary beam in the column grid area is subjected to large equipment loads, a rigid tie rod should be added to transmit the seismic action of the device gravity to the horizontal support chord (beam on the axis) or node.