Three-dimensional Finite Element Simulation Analysis of Bridge-type Inverted Siphon Structure

Abstract. This paper adopts general finite element software to analyse Lingyun bridge-type inverted siphon structure, researching variation law of the inverted siphon’s stress and displacement in construction process and operational process. Research results further verified rationality and security of the design schemes, which provides reliable reference for construction and operational of inverted siphon structure. Project summary Lingyun inverted siphon engineering is located main canal of Gaoling reservoir irrigation, which is located Muping county in Shandong province. The engineering adopts bridge-type inverted siphon structure form, inverted siphon is cast-in-place reinforced concrete pipe structure, concrete strength grade of inverted siphon is C25, rebar is grade. Inverted siphon according to the different head reinforcement, juncture of inverted siphon adopts flat joint form, rubber ring sealing is adopted. Inverted siphon’s flow rate is 3.7 m3/s, flow velocity is 1.1 m/s, roughness is 0.014, inner diameter of reinforced concrete pipe is 1.6 m, wall thickness is 0.2 m. Inverted siphon’s minimum level is 14.6 m, design level is 16.6 m, maximum level is 18 m, overall length is 813 m. Structure Force Calculatio