SOLIDITY RATIO IN STEEL STRUCTURE

It is a matter of concern that, in staad pro, the features available for applying wind load is not fully automatic (unlike other design softwares) , but there is much more lacking in it, which is briefly described as below, There is automatic application of wind load only for few types/shapes of roofs/structures ,like rectangular building,pitched roof, mono slope roofs. For many other types of roofs, like saw toothed roof,cantilever roof,multispan pitched roof, combined roof, inverted pitched roof, inverted mono slope roofs, cylindrical shaped structures etc, the automation of wind load is not available, (or available partly). Moreover, automatic wind load for all types and shapes of "ROOF PURLINS", "COMMUNICATION TOWERS", wind load on circular or elliptical shaped column is not available in staad, local wind coefficient (for corner pressures) is not available, AutoWind load application is available only for global X and Z directions, but wind load in angles like 45⁰,135⁰,225⁰,270⁰,315⁰ needs to implement. It is very demanding that wind load in staad should be available for all types of roofs and purlins with Full automation and can be applied with few clicks, For illustration, refer "TABLE NO. 04 to 24" of IS 875 part -3", refer following snaps 1st snap: wind load on roof purlins 2nd snap: wind load on frames.

Solidity ratio of steel structure has been tagged with status as "ALREADY EXIST", but in fact, it is not exist as it is not fully automatic as expected, because as shown in marked area in atteched image,solidity ratio needs to calculate manually and input the same in the table, solidity ratio calculation is tedious,time consuming and trial-error based process, if any of member/s gets fail,then solidity ratio has to calculate repeatedly, Thus It should be fully automatic. Code priority: IS :800 2007

Code for priority to implement IS 875 part-3 2015, for this IDEA.

Automation of solidity ratio in steel structure as per IS:875 2015 (part-3) for wind load application, has given status of "ALREADY EXIST", But indeed it is not automatic,but input required in table like,solidity ratio, shielding(H),force coefficient(Cf), frame spacing ratio etc, this should be automatic , If implementation of all of these parameters not possible at a sime time, at least solidity ratio/effective solidity ratio should be automatic, as once wind load applied for same member property and the members failed in design, then member property needs to revise and for that member property , the solidity ratio needs to recalculate, this these parameters are time consuming, tedious and trial & error based process. If these parameters are automatically calculated by staad itself ,then it would be better. Similarly, automatic solidity ratio and force coefficient needs to incorporate for the structures like "LATTICE TOWER" ," HORDINGS" and "SIGN BOARD". Code: IS 875 2015 part 3.

Thank you for providing this information. However the solution already exists. If you want to limit the zone over which the loading is applied, then the it is possible to use the XRANGE, YRANGE and ZRANGE options.

Not the original poster but just an idea, maybe provide an option that wind doesn't have to be applied generically. Maybe a similar model that you have created for the new enclosed zone model. you define an enclosed area that the wind would be applied to. Then you got the total area of the enclosed area, the member sizes, their beta angles relative to that plane. Which would be enough to determine solidity.

Just a crazy idea.

Thank you for posting this idea, however, can you elaborate on the concept that you think STAAD.Pro could implement? How are you suggesting the ratio should be calculated when wind is applied a generic model?