Research On Failure Mode Of Round Section Composite Pipe Gallery Structure Under Earthquake

At present,the construction of The Underground Comprehensive Pipe Gallery plays a more and more important role in urban infrastructure construction.The construction of underground comprehensive corridors started late in China.Compared with foreign underground comprehensive corridors,domestic corridors still exist Many deficiencies,compared with developed countries in the construction of underground comprehensive corridors,such as Japan,there is still a lot of room for improvement in the regulations on the construction of corridors in our country.Is at the peak of construction.At present,there are relatively few studies on the seismic response of comprehensive pipe corridors in China.Based on the existing research results,this paper combines the existing theories to study the damage of round section underground comprehensive pipe corridors during earthquakes.The main content of the paper is as follows:First of all,numerical modeling is performed on the concrete pipe gallery with circular cross section,which includes sorting out the existing data of the pipe gallery,such as the selection of material parameters,artificial boundaries,the selection of contact surface attributes,and the selection of seismic waves.Established,the model is divided into two types: non-branched pipe gallery and unilateral expenditure pipe gallery.Secondly,the mechanical performance of the circular section concrete composite pipe gallery under unidirectional ground motion is analyzed.The unidirectional ground motion input direction is divided into two directions: parallel pipe gallery direction and vertical pipe gallery direction.The main research contents include: Based on the displacement time history curves of the circular concrete concrete pipe gallery at the three positions of the arch shoulder,arch waist,and arch foot during the earthquake,the position where the pipe gallery has a large displacement change during the earthquake is determined;through the same vertical direction,The law of acceleration change at different depths of the soil layer,and the influence of the change in soil depth on the acceleration of the soil body during the earthquake is obtained.By comparing and analyzing the three directions of the pipe gallery along the X direction,Y direction and Z direction during the earthquake The internal force changes on the slice,and it is proposed that the design of the pipe gallery plays an important role in controlling the internal force;the stress changes of the joint bolts at the joints during the earthquake are analyzed to determine whether the joint bolts at the joints are still well preserved during the earthquake.Performance;comparative analysis of the performance of the pipe gallery under the ground motion in the parallel pipe gallery direction and the vertical pipe gallery direction,respectively,and from which direction the earthquake is input Damaging effects on the pipe rack more serious.Finally,the mechanical performance of the circular section concrete comprehensive pipe gallery branch openings with different angles under bidirectional ground motion is analyzed,and the arch shoulders,arch waists,and arch feet of the pipe gallery at the variable section of the pipe gallery branch openings are compared and analyzed.At the position,the time-history curve of displacement,acceleration,and stress change under two-way ground motion(in which the angle of the pipe gallery branch opening is divided into 30 degrees,60 degrees,and 90 degrees),the number of angles of the pipe gallery branch opening is obtained.The effect of the change on the stress of the branch of the pipe gallery during the earthquake.