HI.......

KINDLY TELL ME ABOUT THE OPTION IS-875 IN WIND LOAD CASE.

IN CAESAR WHEN WE CHOOSE THE IS-875 CASE, WE HAVE TO INPUT ALL DATA SUCH AS " WIND SPEED, ZONE FACTOR, RISK FACTOR, TERRAIN CATEGORY, EQUIPMET CLASS, TOPOGRAPHY FACTOR."

WHEN WE PUT THE WIND SPEED WHICH WILL AFFECT THE SYSTEM AFTER 10 M ELEVATION , IS IT SAME FOR ALL ELEVTAION AFTER 10 M ?.

MEANS SUPPOSE AT 10 M MY SPEED ID 40 M/S SO AT 30 M WIND SPEED WILL REMAIN SAME OR NOT? BECAUSE WE ARE NOT MAKE OR GIVING ANY TYPE OF INPUT IN "USER WIND PROFILE"

Also i explain it in brief

My plant grade level 60m . so if in isometric the cordinates are showing with adding up the grade level means elevation is 75 m (60 m grade level + 15 m actual hight), so what exact elevation i will choose and put in global cordinate to get wind affects.

should i put the difference of grade level and elvetion as per isos (75 - 60= 15 m) ? if yes or no so why it is like this.

The wind codes will adjust the wind speed based on the elevation. Alternatively, you can define either a speed vs elevation or a pressure vs elevation table.