Load-Carrying Capacity Analysis of RC Slab Culvert Reinforced with Grouted CSP Based on Plastic Theory: Fid-Bau Portal

Load-Carrying Capacity Analysis of RC Slab Culvert Reinforced with Grouted CSP Based on Plastic Theory

Li, Bai-jian / Zhu, Ya-qiao / Fu, Xin-sha

To develop a load-carrying capacity calculation method for reinforced concrete (RC) slab culverts reinforced with a grouted corrugated steel plate (CSP), a numerical equivalent model was established in this paper. Compared with the laboratory test results, the availability of the numerical model was verified. In addition, 21 numerical models of reinforced system were established, and their ultimate load-carrying capacities were obtained. Based on the plasticity theory, a mechanical model and load-carrying capacity estimation method of RC slab culverts rehabilitated with grouted CSP was proposed and verified. It was concluded that when the radii of the sidewall and crown of CSP remained constant, the load-carrying capacity of the reinforced system increased upon increasing the haunch radius. When the haunch radius of the CSP remained constant, the load-carrying capacity of the V system increased upon decreasing the radii of the sidewall and crown. At a constant rise-span ratio, a skene arch provided the maximum load-carrying capacity for the V system. The most important function of the grout was to provide strong lateral restraint for the CSP, which reduced the effective span and improved the load-carrying capacity of the CSP. This also indirectly improved the load-carrying capacity of the reinforced system. In addition, the grout contributed its shear strength to the reinforced system, which caused the grout to exert an arch effect or undergo shear failure. This also greatly improved the load-carrying capacity of the reinforced system. The error between the calculated results and numerical results was in the range of -27-12%. The findings of this paper provide a reference and guidance for engineers to design similar rehabilitated systems.