RAM Structural System Help

Models with Hanging Columns

Models which have hanging columns require iteration during the "Design All" process. During this process the calculated self-weight of beams are applied to supporting columns and supporting beams, hence the dead load and self-weight load as calculated for supporting members in RAM gravity need to be updated. This triggers a chain reaction as the supporting member is supported by another member and so on. In situations where hanging columns support steel beam a similar treatment is required. A hanging column can have multiple steel beams framing into it. A part of the self-weight on these framing beams will go to the supporting hanging column. Thus, when the self-weight load of the beam changes during the design process the dead load on the supporting hanging column also changes. The hanging column transfers its load to the level above (and hence differs from standard column which transfers its load to the level below). During "Design All", the beams are designed from topmost story to bottommost story. This requires an iterative analysis as hanging column dead load is not updated until the steel beam member it is supporting is designed. The iteration is only performed between the hanger levels and is terminated when the loads in the hanger load stops changing. Thus the load on the members supporting hanging columns correctly includes the correct self-weight of the members that it supports.