局部穿透腐蚀高强钢管混凝土柱抗冲击性能研究

Anti-impact performance of concrete-filled square steel (CFST) can be obviously affected when local corrosion occurs. Here, the software ABAQUS was used to establish a numerical model of square high-strength concrete filled steel tubular(HSCFST) columns, and effects of parameters of slit angle, slit length, impact surface and impact energy on anti-impact performance of HSCFST columns were considered. The numerical simulation results showed that under effects of local penetrating corrosion, crack of component with horizontal slit under front impact has close phenomenon, while crack of component with horizontal slit under side impact can reveal a "triangle" shape during being damaged; impact force platform value is mainly affected by impact surface, followed by slit angle, and slit length mainly affects components bearing back impact; increase in slit angle and decrease in slit length are proportional to increase in impact force platform value, anti-impact performance of components subjected to front impact is better than that of components subjected to side and back impacts; decrease in slit angle can increase midspan deflection of components, and midspan deflection of components subjected to front impact is smaller than that of components subjected to back and side impacts; energy absorption rate of component is proportional to increase in slit length and inversely proportional to increase in slit angle; energy absorption rate of component subjected to back impact is the highest, while that of component subjected to front impact is the lowest; based on a large number of parametric analysis results, a practical calculation method for the influence coefficient of dynamic bending capacity of HSCFST columns under local penetrating corrosion is proposed.