BigH thanks for the reference. I actually have the first edition of the book. It is good to know you can use inner friction factor of the soil at toe side of key to calculate friction which is a great benefit. Just wondering if there is a minimum height requirement for the key in order to take...
When I working on a retaining wall, a key seems necessary for resisting sliding. I am wondering do I need to count the soil pressure on key? I use a software called retainingpro, it doesn't include that force.
the reason I use wall 3 and 4 as shear wall is because wall 2 and wall 6 have too much openings and wall 3 and wall 4 are solid.
JAE, if I add additional rebars for drag force, where should I add them, just the stripe of the roof aligned with wall 3 or 4 with the width of the wall? Do I need...
I am working on a single story masonry building with concrete roof(see attached sketch) . I am wondering do I need to consider drag force when design the roof (e.g. for wall 3).
but i am curious how wide the door and window is. is there a parapet and are all cells solid grouted?
You probably can show him your calculation or let him to see other buildings you designed that similar to this one.
StructuralEngGuy, this thing really makes me confuse. If I don't do the 1/3 increase, I ended up to use twice as much rebar as what needed by doing a strength design.
bnickeson, ibc cbc probably the same thing. For that allowable stress increase, I think if you choose to use the alternative basic load combinations in 1605.3.2, you are permitted to do that.
I am doing a masonry retaining wall design. cbc 2007 section 2107 says for allowable stress design shall use chapter 2 of aci-530 but delete section 2.1.2.1 (load combination) in ACI-530. I am wondering can I still increase allowable stress by one third per aci-530 section 2.1.2.3 for seismic load?
Thanks bnickeson and kslee1000. When I did the calculation I modeled the roof as a continuous beam with 3 supports and the roof will be a monolithic pour concrete roof.
per seismic design requirements (ASCE-7) roof has to be anchored to wall. to my understand, if there has the anchorage, there...
bnickeson:
Thank you for the reply. I am a little confused. If calculation shows that there is moment on wall, can this moment be ignored by using certain connection detailing? Probably I should use two simple span beams instead of using continuous beam with 2 spans if I want to eliminate...
I am designing a building with concrete roof and masonry walls. When I designed the roof I assume the roof is supported by three walls and calculation shows that the middle wall has a moment beside reaction. My question is when I design the middle wall do I need to consider the moment for...
