Good morning everyone,
Currently working on a concrete structure. Mostly CIP beams and columns, with shear walls as my lateral system. I am currently calling for 6000 psi concrete for the shear walls. Due to building and architectural constraints, I am limited in the width of my concrete beams. My question for the community is this. If/when you have a concrete beam framing perpendicular to the concrete shear walls, how do you typically deal with the required development length for your concrete beam hooked bars into the shear walls? These beams are going to help transfer my lateral loads to the shear wall system.
In my situation, I currently would need #7 bars for my beam design. I thought of trying to use a smaller size bar to ensure my development length into the shear wall is adequate, but due to the limited width of my concrete beam, I can only physically fit a certain number of bars to ensure proper concrete placement. This means that I currently would need a minimum hook length of 9.5" to get proper development. I've thought about multiple top and bottom layers of longitudinal reinforcing, but was hoping to avoid that if possible.
All this being said, say you had a 10" shear wall. For the sake of conversation, lets assume 1.5" of cover. That would leave us with 8.5" available for your ldh for any reinforcing being hooked into the shear wall. What methods can be done to ensure that the beam reinforcing placed into the shear wall achieve the necessary development length?
I know the easy answer would be to say to increase the shear wall thickness or beam dimensions, but I was hoping to start a conversation about other possible alternatives. Or even see if anyone has any other ways around this predicament. Any thoughts, comments, or input are greatly appreciated!
Currently working on a concrete structure. Mostly CIP beams and columns, with shear walls as my lateral system. I am currently calling for 6000 psi concrete for the shear walls. Due to building and architectural constraints, I am limited in the width of my concrete beams. My question for the community is this. If/when you have a concrete beam framing perpendicular to the concrete shear walls, how do you typically deal with the required development length for your concrete beam hooked bars into the shear walls? These beams are going to help transfer my lateral loads to the shear wall system.
In my situation, I currently would need #7 bars for my beam design. I thought of trying to use a smaller size bar to ensure my development length into the shear wall is adequate, but due to the limited width of my concrete beam, I can only physically fit a certain number of bars to ensure proper concrete placement. This means that I currently would need a minimum hook length of 9.5" to get proper development. I've thought about multiple top and bottom layers of longitudinal reinforcing, but was hoping to avoid that if possible.
All this being said, say you had a 10" shear wall. For the sake of conversation, lets assume 1.5" of cover. That would leave us with 8.5" available for your ldh for any reinforcing being hooked into the shear wall. What methods can be done to ensure that the beam reinforcing placed into the shear wall achieve the necessary development length?
I know the easy answer would be to say to increase the shear wall thickness or beam dimensions, but I was hoping to start a conversation about other possible alternatives. Or even see if anyone has any other ways around this predicament. Any thoughts, comments, or input are greatly appreciated!
