A Modeling Method for Concrete-Filled Steel Tube Frame-Multi- Ribbed Reinforcement Concrete Wall System

The multi-ribbed composite wall is a new type of seismic wall formed by concrete ribbed beams and ribbed columns, and filled with light weight materials in the grid. It has the advantages of light weight, good seismic performance, convenient construction and low cost; hence, having a promising future in multi-level buildings. The concrete-filled steel tube frame-multi-ribbed reinforced concrete shear wall structure system is formed by combining multi-ribbed composite walls with the concrete-filled steel tube frame structure system, which makes the seismic performance of the structure system better and saves the construction cost. However, there is no modeling method for concrete-filled steel tube frame-reinforced concrete multi-ribbed shear wall structure system for designers, which restricts the practical application of this kind of structure system. Because of this, the experiments on two multi-ribbed composite walls under lateral monotonic loading were carried out. The force-lateral deformation curves of the walls were obtained. Based on the test results, two equivalent modeling methods were compared, and an equivalent modeling method for multi-ribbed composite wall was proposed. Based on the equivalent modeling method, the comparative studies were conducted for concrete-filled steel tube frame-multi-ribbed composite wall structure system with different methods. The effects of the equivalent modeling method on the mechanical properties were investigated.