在模型中添加了自动计算地震荷载，出现了警告，请高手帮忙查看一下！
  **WARNING: IF THIS UBC/IBC ANALYSIS HAS TENSION/COMPRESSION
  OR REPEAT LOAD OR RE-ANALYSIS OR SELECT OPTIMIZE, THEN EACH
  UBC/IBC CASE SHOULD BE FOLLOWED BY PERFORM ANALYSIS & CHANGE.

我怎么能让地震荷载作用到每个节点上呢

地震荷载后面加一下命令。。

LOAD 1 LOADTYPE Seismic  TITLE SEISMIC LOAD (EX)
UBC LOAD X 1
PERFORM ANALYSIS
CHANGE
LOAD 2 LOADTYPE Seismic  TITLE SEISMIC LOAD (EZ)
UBC LOAD z 1
PERFORM ANALYSIS
CHANGE

谢谢！