APPLYING DIFFERENT DECENTRALIZED LOADINGS ON RC CONTINUOUS DEEP BEAMS USING STM

This research presents strut and tie modeling for the reinforced concrete continuous deep beams that are subjected to different types of decentralized loadings The different types of loadings area single concentrated force, two concentrated forces, and a uniformly distributed load. internal shear span to the effective depth r current questions are presented besides the detailed numerical examples. It is concluded that, in case of single concentrated force, reducing a/d from 1.36to 1.09, 0.81, and then to 0.54, increased the ultimate respectively. It is also concluded that, in cases of two concentrated forces and uniformly distributed load, reducing a/d from 1.09 to 0.81, 0.54 and then to 0.27, increased the ultimate capacity by about 12%, 17% and 21% respectively increment in the ultimate capacity occurred because upon moving the load from span center toward the inner support, the length of the inner strut shortens and the dimensions of its section increase significantly which leads to more strength It is true that, in contrast, the length of the external strut increases and its dimensions decrease, but this decrease in its dimensions is slight, making the weakness cause is due to that, ineffective and therefore, indecisive.