Seismic Response And Reliability Analysis Of Buried Isolated Rectangular Concrete Liquid Storage Structures

In the modern time,with the scale development of underground engineering,a large number of buried rectangular concrete liquid storage structures play an important role in industrial production and daily life.However,the damage of structures which are under the earthquake has caused losses to industrial production,people's lives and property safety.Therefore,it is quite necessary to grasp seismic response law of buried rectangular concrete liquid storage structure,carry on the corresponding isolation measures to reduce the risk of damage under the earthquake.Besides,for concrete liquid storage structure,especially the ground type concrete storage structure with poor seismic performance,it is significant to analyze the reliability of the structure under the earthquake,put forward the main factors that affect the reliability of the structure and strengthen the safety performance of the structure in the course of using.In this paper,using the finite element software ADINA to carry out fluid-structure coupling dynamic time history calculation on the half-buried rectangular concrete liquid storage structure,the whole buried rectangular concrete liquid storage structure,the foam concrete isolated rectangular liquid storage structure and the foam concrete isolated rectangular liquid storage structure with sand cushion isolation,the seismic response law is analyzed.In addition,the ANSYS software is adopted to calculate and analyze the reliability of the ground type rectangular concrete liquid storage structure and buried isolated rectangular concrete liquid storage structure when the wall thickness and internal liquid depth are random.The results are as follows:(1)Under the same earthquake,the effective stress and the wall displacement deformation of rectangular concrete liquid storage structure decrease with the increase of buried depth.In summary,the whole buried rectangular concrete liquid storage structure has higher safety and stability;(2)The peak values of the effective stress,wall displacement and the liquid sloshing height of the foam concrete isolated rectangular liquid storage structure are all less than the peak values of no-isolation buried rectangular concrete liquid storage structure,and the vibration intensity of the wall is more moderate than no-isolation liquid storage structure.It suggests that the isolation method of applying the principle of seismic wave attenuation when it spreads in random space medium to the underground hydraulic structure is effective.The foam concrete liquid storage structure with sand cushion isolation protects the wall,weakens the earthquake effect on liquid storage structure bottom,reduces acceleration of the liquid storage structure,and improves the security of the buried rectangular concrete liquid structure under the earthquake.(3)The reliability of the rectangular concrete liquid storage structure increases with the increase of the wall thickness,and decreases with the increase of the liquid depth.Among two random factors,the reliability of the structure is more sensitive to the change of the wall thickness.Compared with the ground type rectangular concrete liquid storage structure,the buried isolated rectangular concrete liquid structure has better reliability.In addition,the increase of the seismic intensity reduces the reliability of the structure,and the increase of the concrete strength has a significant effect on increasing reliability of the structure.