Beam lines are missing

Question

i have done the rcdc, column and slab but when comes to beam are shown the beam lines is missing

Abhisek M · Answer

Hello Zhang, 
 As suggested by Joseph please upload the STAAD file for further investigation. Below are just few suggestions in this case which may be helpful. 
 1. Check if the level selected is actually having beams in STAAD model. In RCDC even if there is no beam and a node exists in a column, it will show that level in beam module. So double check if you are selecting the correct level. 
 2. Check if there is any duplicate or colinear beam in the model. 
 3. Check if the beams are in a single plane.