Hi sir, why is the shear diagram 2'-2"/8'8" from the FACE of the support, but in the top diagram, the dimensions are from the CENTRE LINE of the support, thanks
In structural analysis for reinforced concrete structure, the so-called critical shear force location is the most important to be determined by a structural designer. The critical shear is by theory and realistically, a distance away from any support and that distance is approximately from 2' - 3' from the face of the support. It is impposible for the critical shearr to occur right at support since there are two opposing forces at the point of contact between the support and the end reaction of the slab - it's not the breaking point of any horizontal or flexural member. As for the 8'-8'', it is the cut-off location of the 3rd layer of the tensile reinforcement since the shear is very small and no need for that bar to extend up to the support.
And also someone was asking me how to design the support. The support is to be designed same as a reataining wall. The load to be carried by the rataining are: 1. the reaction from the transferred load from the T-girder as a vertical load, 2. the horizontal soil pressure (soil load) from one face of the support, 3. the upward load from the Soil Bearing Pressure where the footing of the retaining wall which is also the support of the bridge, come in contact with the soil at the very bottom of the footing. To design the support is actually designing a wall and combined with the footing as one structure and therefore thorough knowledge in foundation design is required. I have a book coming up and I am still writing it and it is called "Foundation Design in Concrete Strucutre" and will be available at all amazone outlets.
Best informative video for @/roadandbridge. Thanks a lot, sir. Your lectures help us for @/roadandbridge design.
Thank you very much for this effort. I learnt a lot from your video. Looking forward to learn more.
Thanks , bridge construction is interesting .
sir, can you please upload a detailed girder bridge calculation..as per AASHTO.
Hello Sir. Why do you use open U stirrups and not closed stirrups? Is there any benefit besides construction time on bending the bars in place? Thanks
LOTS TO DIGEST
Please do make videos more Clearly...., content n explaination s awesome
Hello sir,please increase your sound quality
Hi sir, why is the shear diagram 2'-2"/8'8" from the FACE of the support, but in the top diagram, the dimensions are from the CENTRE LINE of the support, thanks
In structural analysis for reinforced concrete structure, the so-called critical shear force location is the most important to be determined by a structural designer. The critical shear is by theory and realistically, a distance away from any support and that distance is approximately from 2' - 3' from the face of the support. It is impposible for the critical shearr to occur right at support since there are two opposing forces at the point of contact between the support and the end reaction of the slab - it's not the breaking point of any horizontal or flexural member. As for the 8'-8'', it is the cut-off location of the 3rd layer of the tensile
reinforcement since the shear is very small and no need for that bar to extend up to the support.
And also someone was asking me how to design the support. The support is to be designed same as a reataining wall. The load to be carried by the rataining are: 1. the reaction from the transferred load from the T-girder as a vertical load, 2. the horizontal soil pressure (soil load) from one face of the support, 3. the upward load from the Soil Bearing Pressure where the footing of the retaining wall which is also the support of the bridge, come in contact with the soil at the very bottom of the footing.
To design the support is actually designing a wall and combined with the footing as one structure and therefore thorough knowledge in foundation design is required. I have a book coming up and I am still writing it and it is called "Foundation Design in Concrete Strucutre" and will be available at all amazone outlets.
Please sir can you calculate the details of Girder bridger using NZ and AS STANDARDS?
Thanks