A Study Of Vertically-Loaded Local Transfer RC Joint From Inclined Column To Wall

According to test results of two specimens of local transfer RC joint from inclined column to Beeline-shaped wall under vertical static loads and results of corresponding finite element analysis(ANSYS), fundamental behaviors of the joint are achieved, which include paths of vertical load transfer before and after cracking, stress distributions, occurrence and development of cracks and final failure mode of the joint. In the test, the stress distributions of wall which is upon the transfer beam and square column and the vertical stress distributions of transfer beam and inclined column are specially studied. The result indicate that there is much difference between the hollow inclined column-wall transfer R.C joint and the solid inclined column-wall transfer R.C joint on the mechanism of load transfer. As far as he hollow inclined column-wall transfer R.C joint is concerned, the stress state of transfer beam is very critical, because it bears not only the vertical load transferred from the wall, but also the axial load initiated by the inclined column. The inclined column's failure due to a complex stress state resulted in a dramatic stress redistribution as well as a local compressing failure in the wall, in which its capability was not fully used. The mechanical behaviors of the joint followed obviously the characteristic of truss model. As far as the solid inclined column-wall transfer R.C joint is concerned, the inclined column with a bigger angle,transfer beam and square column work as a whole, and the load transfer mechanism is similar to the transfer beam. The stress state in the wall is much more even, so the effect of transfer is much better than that of the hollow inclined column-wall transfer R.C joint.According to the results of the experiment and finite element analysis, the paper discussed the design method of the two types of R.C joint. As far as the hollow inclined column-wall transfer R.C joint is concerned, the paper introduced the truss model to calculate the internal forces of transfer beam, inclined column and square column. In the paper, the method of equivalent stress is adopted to confirm the outside force of the truss model, and the factor of the angle of inclined column is considered. A design method of the wall was suggested. As far as the solid inclined column-wall transfer R.C joint is concerned, the method of unequal stress based on hypothesis of rigid angle isadopted to calculate capability of the wall and transfer beam. It is also suggested that more researches be done for the inclined column in the solid inclined column transfer joint.