Experimental Study on Materials and Mechanical Properties of Steel Tube-Confined Coral Concrete Reinforcement Mechanism

Filling steel tubes with coral concrete to form concrete filled steel tube composite structures for compression members can compensate for its low aggregate strength. In order to demonstrate the reinforcement mechanism of coral concrete hoop under steel tube restraint and to propose the strength theory under the hoop effect, it is necessary to obtain the theoretical analysis based on the theory of triaxial compressive bearing theory of normal concrete. Therefore, starting from the failure mechanism of coral concrete under triaxial compression, the hoop reinforcement mechanism of coral concrete under different lateral pressure conditions is studied analytically. By the axial compression bearing capacity comparative test between normal concrete and coral concrete under steel tube restraint, comparative relationship between lateral pressure and circumferential strain is calculated and the conditions for taking values are acquired, which lays the foundation for the calculation theory of the compressive bearing capacity of it.