huangyhg

strut and tie model and punching shear
i have to design a beam to support large point load (column over) which is about 0.5m from the support (column under).
if i use strut and tie model to design this area, am i still required to check for punching shear because the reaction is quite large. (i'm not too familiar with stm method).
thanks
check out our whitepaper library.
i would say that in this case you have to design and check mainly a corbel. there are provisions for designing corbels in the structural journal, and many texts like the one on rc by nawy also has. if there is more concrete than the corbel, you need design for the shear -and any forces- standing in whatever the kind it comes. but you can reinforce the whole thing (with care) as the superposition ot the corbel thing and the rest. if feasible, better to use a deeper thing than a corbel, but more likely is not feasible, from your exposition.
search in the mathsoft mathcad 2000 collaboratory, civil engineering folder
reinforced concrete corbel
i believe the reason for the development of the strut and tie model was to provide a load path which is more accurate than a deep beam model. to this end you have tension and compression forces but no shears.
thanks for both replies. my problem is not really a corbel situation. the beam is just support another column above which slightly offsets from the column below.
will i still have to check for punching shear with stm?
thanks
as stephened signals you need to ensure a load path to the ground for any loads. then, for example, and out of memory since the column has such small offset i think to re
do you have the new aci code? there is a quite extensive appendix having to do with the strut and tie models. no "punching shear" to worry about. it doesn't sound like you have a cantilever or corbel (right?).
there are some special aci provisions for a "regular" beam if the concentrated load is located less than a distance d from the support, but this will not apply in the s and t model.

__________________
借用达朗贝尔的名言：前进吧，你会得到信心!
[url="http://www.dimcax.com"]几何尺寸与公差标准[/url]