Abstract: The model tests of a new type of arch components of underground supporting structure with corrugated steel webs were carried out to study the local stability performance． The model tests included six semicircular arch supports models，and the effects of width to thickness ratio of the flange and height to thickness ratio of the web on the local stability of corrugated steel webs were analyzed． Then the local buckling performance of the test bracket was calculated and analyzed by finite element software ANSYS，at the same time，compared with the test results． Finally， the elasto-plastic local buckling numerical analysis of arch structure was conducted． The results show that the local stability capacity of the arch component greatly increased with the decrease of the width to thickness ratio of the flange，and the local buckling of flange can lead to the increase of global deformation of the component and then cause the global buckling of the arch component． The local stability capacity of the arch component also increased with the increase of the height to thickness ratio of the web． The local buckling of the webs may lead to the local buckling of the flange，which induce larger deformation and speed up the global buckling of the component． The experiment results of the support were in good agreement with the results of the finite element model，so the finite element model was verified． The increase of web height and thickness， flange width or thickness can increase the local stability capacity of corrugated steel webs． With the increase of the arch angle ( rise to span ratio) ， the local buckling capacity of the flange decreases gradually， the arch angle has little effect on the local stability bearing capacity of corrugated steel webs． 

Key words:  corrugated steel webs, arch structure, local stability, width to thickness ratio, height to thickness ratio