Aerodynamic Effect And Fatigue Research Of Vehicle-induced Wind Of Metro Station On Platform Screen Doors

The objective of this work is to analyze the aerodynamic loads from a non-stop train over a semi-closed PSD and full-closed types,considering different train speeds and different positions of the PSD fa(?)ade from the track center.The work was supported by CFD software study of pressure variations in 57 points of measurement,distributed in 19 points in the length of the PSD,in the heights of 900,1650 and 2600 mm from the floor of underground station equipped with semi-closed type PSD and tunnels at the entrance and exit of the station,the study also verified the effects of the PSD fa(?)ade being positioned at the dimensions of 1620,1680 and 1750 mm from the center of the track with the train passing at 120km/h.Another support study is an experimental test measuring the pressure of the piston wind over the PSD in 5 longitudinal positions from a non-stop train of 8 type A cars passing at 45,50 and 60km/h,performed in elevated(PSD type semi-closed)and underground(PSD full-closed)stations of Line 11 Shenzhen Province(China).Based on the CFD estudy and the experimental tests,the aerodynamic loads from trains at 160km/h were estimated considering different configurations of pressures distribution and applied over a PSD designed for trains with conventional speed,where the highest peak-to-peak pressure variation value was 4,2k Pa.The effects on the PSD main structure using FEA software for static structural and fatigue analysis showed a stress reduction of 44% in the structure from worst to the lightest scenario.The PSD of Adolfo Pinheiro station of line 5 S(?)o Paulo subway(Brazil)was chosen for the studies.Positioning the PSD further away from the platform edge reduces the effects of the train piston wind.Other alternatives studied for tunnel region also is applicable to PSD,for example limiting train speed on the station perimeter,reduced blockage ratio,ventilation channels adjacent to the station,sharp nose of the train,short train lenght.The full-closed type PSD has superior performance over the semi-closed type to withstand high aerodynamic loads.To estimate the loads to aerodynamics in the passage of the train at higher speeds,the characteristic curves of pressure variation were raised as a function of the speed of the train of each locality studied.The analysis of the coefficients of log curves allowed to better identify the influence of each infrastructure characteristic in relation to the analysis of the coefficients of the exponential curves.Each project needs a specific detailed verification,but in view of the results obtained in this study,the PSD equipment showed be compatible with fast trains because it can resist to high aerodynamic loads and can count with alternatives to effects reduction.