I was thinking about designing the concrete walls to carry 100% of the load (plus torsion) and designing the steel lines to carry say 25% of the of the load (no torsion) and limit their lateral deflection to the allowable story drift given in the Code.Īny thoughts would be appreciated. This article will focus primarily on steel lintels, particularly, inverted C-channel lintels. How do you determine relative stiffness when you combine (in the same direction) concrete walls and some type of steel resisting system such as x-bracing, knee bracing or a moment frame - is it based upon lateral deflection? With something this short, it would seem that lateral deflection of the concrete shearwalls would be next to nothing with no way to match that deflection with the steel. A lintel is a horizontal support member, comprised of stone, masonry, timber, concrete or steel, that’s installed across the top of a door, window or other opening to support the load above the opening, and transfer the load down to the bottom of the wall. Due to architectural constraints, I cannot use X-bracing in these two walls (only moment frames or knee bracing).įor lateral loads, Is there a way to stiffen the steel frames to try to pull the center of rotation (reducing "e")out away from the intersection of the two concrete legs? Should I even try? Supporting the 2nd level, I have concrete walls retaining soil along two of the sides (forming an "L") and steel columns and beams along the other two sides. Specify the yield strength of the base plate material. Select between ASD or LRFD design methods. Determining the bearing pressure by this method might result in thicker plates if bending stress is high between webs or within pipe or tube walls. I have a two story parking structure approximately 100'x100'. Maximum Fp is used to calculate design minimum plate size.
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