The Complete Message:
Tie beam dimensions cannot be less than 300 mm. (TBDY 2018 16.8.5.4)
This message is given for the basic coupling beams.
In TBDY 2018 article 16.8.5.4 , the minimum size of coupling beams will be 300 mm × 300 mm, it is stipulated .
Solution
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Give the dimensions of the so-called coupling beam at least 300 mm.
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Select coupling beam, coupling beams
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Enter the properties.
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In the general tab, give the width and height at least 300 mm and click the OK button.