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Thank you for your reply! This is evidently a not-uncommon way to design mat foundations that reduced the concrete and reinforcement needed by 20-30%. Thus we are using a non-uniform mat foundation to save costs. The non-uniform thickness of the mat will not just be controlled by the thinner...

I need to design a mat foundation, but we want the type of foundation that does not have uniform thickness. Under each column we want the mat to be deeper, and then to be thinner between columns. I am designing this by hand. I have found out how to design mat foundations using the rigid method...

I am running a response spectrum analysis using SAP and trying to determine base shear. However, when I have SAP output the "Base Reactions," and when I sum up all of the "Joint Reactions" SAP outputs for the base points of the structure, I can get very different numbers. For example: Base...

I am fairly new to SAP and am trying to do a seismic analysis on a three-story building with a braced frame seismic force resisting system using a response spectrum analysis. I can run the response spectrum analysis, but once I have I cannot figure out how to get story shear out of the model...

I have been using SAP to analyze a building. I am using a modal response spectrum analysis to do seismic analysis. Given part of the ASCE 7 code, I need a way to get story shear out of my model. I have tried exporting information into excel, such as element joint forces for elements connecting...