用PVELITE计算耳式支座设备，地震载荷一定要选择G LOADING选项吗？

这个警告是什么意思？耳式支座设备地震载荷一定要选择G LOADING选项吗？
Note: Lug supports should be modeled on an element of their own
   whose length is just slightly greater than the height of the lug
   assembly.  The vessel does not have to be constructed with this extra
   element, just modeled this way.  This is to insure there is proper
   mass distribution for these types of models.
                                                                                 
   Warning:
   This is a vertical vessel on support lugs and the earthquake type selected
   is a building code.  Building codes assume all of the mass is located above
   the point of support.  This makes their use on lug supported vessels
   questionable.  It is strongly suggested that based on the seismic zone
   and applicable parameters, an appropriate lateral (Gx) and (+-) vertical
   (Gy) acceleration be applied using the G loading option.

1。按照客户的标准要求计算。

G load 是什么东西？？

G load就是地震时水平和垂直方向的加速度。

LZ的情况应该用客户提供的地震规范，算出水平和垂直地震加速度，在用软件算时把这两个加速度输进去。