Papers by Author: Pi Ji Hou

Abstract: The existed research shows that when SRC component is under stress, there is bond-slip happened between shape steel and concrete. And the bond-slip have a certain influence on the bearing capacity of SRC component, when component is loaded to ultimate load, the bearing capacity descends quickly because of the effect of bond-slip between shape steel and concrete. Finite method of fiber finite element is a useful way to simulate this kind of composite components, but it ignores the behavior of bond-slip between shape steel and concrete. So building a bond-slip formula for fiber element to simulate SRC component has a practical significance. It’s not only gets more precisely calculated results, but also make the simulation of failure model close to the practical situation. In this paper, in order to add bond-slip effect into fiber element theory, a formula was set up to adjust stress of steel material, which was based on constitutive equations of our bond-slip tests. The method was programmed in OpenSees and used to simulate tests of SRC frame under cycling load, the simulate results shows that the method suggested in this paper is an effective way to express behavior of bond-slip in SRC component.

Abstract: A macroscopic finite element model and a microscopic one were set up respectively to simulate SRC frame with two bays and three stories under cyclic loading, by comparing the simulation and test results, the authors find that the results obtained from the two finite methods have few differences, and each of them can satisfy the demands of engineering, but the principles established in simulation process were different. The macroscopic finite element model was established by very few elements and the results data were obtained easily and quickly, however, it just attain some macroscopic mechanics data (axial force, bending moment and shearing force etc.). The microscopic finite element model involves complex modeling principle, not only needs more time for dealing with the geometry model, gridding and boundary conditions and so on, but also limited by professional knowledge, which make users establish a correct model hardly. The comparison shows that macroscopic finite element method has many advantages in engineering fields.