Experimental investigation of the bond-slip behaviour between corrugated steel plates and concrete in CSRC structures

摘要

Corrugated steel and reinforced concrete (CSRC) composite structures refer to composite structures that contain reinforced concrete and corrugated steel plates as load-bearing components. To study the interfacial bond-slip behaviour between the corrugated steel plate and concrete, a total of sixteen CSRC specimens were designed, and push-out tests were performed. The influences of the concrete strength, the thickness of the concrete protective layer, the stirrup ratio and the embedment length of the corrugated steel plate on the bond-slip behaviour of the CSRC composite structure were analysed. In addition, the contribution of corrugation ridges, corrugation valleys, and the inside and outside of the corrugated steel plate to the bond strength was studied. The results demonstrated that the final failure modes of CSRC specimens could be divided into two types, namely, bondsplitting failure and bond-anchoring failure; the strain of the corrugated steel plate in the CSRC specimen at different positions exhibited an approximately exponential distribution. The four main influencing parameters all had a positive impact on the interfacial bond strength of CSRC. From the perspective of the contribution of different parts of the corrugated steel plate to the ultimate bond strength of the CSRC specimen, the corrugation valley is weaker than the corrugation ridge, and the inside and outside of the corrugated steel plate are approximately the same. Through the method of linear fitting, the calculation formulas for the bond strength of CSRC were obtained. Based on the concept of interface failure energy (Gf), a more accurate bond-slip constitutive model of the CSRC was proposed, which could provide a certain basis for establishing the relevant theoretical calculation methods.