Analysis of design requirements for seismic support systems

Update:09 Oct 2019
Summary:

Nowadays, the requirements for seismic resistance of bu […]

Nowadays, the requirements for seismic resistance of buildings are becoming more and more strict, and it is precisely the design specifications of electromechanical anti-seismic bracket systems that are becoming more and more specialized. Today, Qiqi Litai Technology will tell you about the requirements of electromechanical anti-vibration bracket design.
First, the design of the seismic mount must use the finished component material, but not the steel. The C-channel steel used in the bracket shall have a steel yield strength of not less than 250 MPa and a tensile strength of not less than 330 MPa.
In addition, the oblique support of the C-channel steel of the electromechanical anti-vibration bracket requires the use of cold-formed thin-walled finished bracket channel steel. Its cross-section is: 41x41mm, 41x52mm or 41x72mm. The wall thickness is not less than 2.0 mm, and the cross-sectional shape should have a stiffener with a depth of not less than 1 mm to ensure the force. The thickness of the galvanized layer of the electromechanical anti-vibration bracket must be ≥ 20 microns, and the relevant galvanized layer thickness test report and the 240-hour neutral salt spray test report are provided.
For the door type anti-vibration bracket, if the double-sided splicing of the C-shaped channel is required for the force calculation, in order to ensure the overall force performance of the double-sided channel steel, the splicing process should be back-hole punching connection or integral laser welding. Process, can not be connected by discontinuous spot welding.
For electromechanical anti-vibration brackets, C-shaped channel steels must have heat-treated teeth with a depth of not less than 0.9 mm at the inner edge of the bead, and the joint fasteners with the same depth should also have the same depth of the pits to ensure the occlusion. Connection mode can achieve ductile damage when encountering large horizontal loads.
Secondly, in order to ensure reliable installation and connection, the connecting fastener used in the electromechanical anti-vibration bracket system must be an integral connecting fastener, and the joint connection of the bolt and the spring nut cannot be used.
Finally, Zhongqi Litai Technology recommends that in order to ensure the overall safety of the seismic support, all components of the seismic support should be provided by the same manufacturer and must not be purchased separately from different suppliers.