Influences of Temperature Changes on Behaviors of Large Prestressed Concrete Inverted Siphon

The structure of prestressed concrete inverted siphon is a large-volume concrete structure with complex stresses,and the stress is difficult to be ascertained when the structure is affected by changing temperature.The structure of inverted siphon was analyzed using 3-D finite element method(FEM) to obtain the stress distributions under nine working conditions including no change of temperature,maximum temperature rise,and maximum temperature drop.The results showed that under several working conditions,the structure of prestressed concrete inverted siphon did not produce tensile stress with no change of temperature.The large tensile stress were produced under the working conditions I and III with temperature changes.Under the condition of temperature rise,the tensile stress was 1.53 MPa and 1.72 MPa,respectively,in the bottom surface of base plate for condition I and the top surface of apical plate for condition III.Under the condition of temperature drop,the tensile stress was 1.36 MPa,1.77 MPa,1.85 MPa,and 1.65 MPa,respectively,in the sidewall for condition I,in the bottom surface of apical plate for condition III,in the top surface of base plate for condition III,and in the sidewall for condition III.Therefore,temperature changes had significant impacts on the structure of inverted siphon.