Theoretical Research On The Limit Value Of Width-Thickness Ratio Of The Plate Of H Section Steel Of The Steel Reinforced Concrete Column

The steel reinforced concrete member is a sole structure form composed of H section steel and reinforced concrete. SRC member consists of H section steel, rebar, hoop and concrete. H section steel is in the core of the member and encompassed by reinforced concrete. We can see the limit value of the width-thickness in the code Technical specification for steel reinforced concrete composite structures, include web and flange. However the source of the limit value is multiplied by 1.8～2 on the basis of the limit value of width-thickness ratio, which is regulated in the code Technical specification for steel structure of tall buildings, according to some experiences in Japan. In this paper lots of samples are solved with the finite element program ANSYS. A simple formula is simulated simply from the results of those samples. The primary content of the study includes:(1)The theory analysis of the critical load of the plat of H section steel column is made. And the critical load is solved with FEM ANSYS. Then the two results are compared in order to obtain a correct method making FEM mode with FEM ANSYS.(2)The critical loads of some simple supported rectangular plates on four sides are analyzed with FEM ANSYS and are compared with the theory results. The feasibility of the analysis with FEM ANSYS is appraised. Some plates with different lateral supported situations are analyzed with FEM ANSYS to obtain their critical loads as well as corresponding buckling configurations, in order to make a basis to analyze some SRC members.(3)The stability analyses on the webs of SRC members are made under the consideration of the contact between the H section steel and reinforced concrete. The critical stresses of the webs of SRC members are obtained with the consideration of the contact. The promotional extent of the limit value of the width-thickness ratio is found after they are compared with the code. A simple formula is simulated from the results of those samples, in order to supply a consult to design buildings.(4)Three total ultimate loads of SRC members are made with FEM ANSYS under the consideration of the contact between the H section steel and reinforced concrete. These results are compared with the results of some experiments made by some colleges. Hence the feasibility of the analysis with FEM ANSYS is confirmed.