Design And Performance Of Flexible Seismic Supports And Hangers For Water Supply And Drainage Horizontal Single-pipes

Seismic activity is a kind of sudden,violent,and devastating natural disaster.At the same time,China is one of the most threatened countries in the world by earthquakes.Water supply and drainage pipeline system is an important part of non-structural components,which is of great significance to ensure the basic function of the building.At present,the main anti-seismic measures for water supply and drainage pipelines in China are anti-seismic supports and hangers.The installation of anti-seismic supports and hangers can effectively protect water supply and drainage pipelines,so that the pipeline system could resist horizontal earthquake,then reduce damage.However,the traditional seismic supports and hangers which are widely used have some shortcomings,such as the overly rigid structure,and the brace resists seismic force only by tension and compression deformation.Such supports and hangers are easy to be destroyed during the earthquake,and the maintenance cost is high.Therefore,this paper proposes a new type of flexible seismic supports and hangers for horizontal single-pipes,which focus on optimizing and innovating the traditional seismic brace.The new seismic brace has three sections.Two of them are the inner steel pipes and set at both ends and the middle section is outer steel pipe.Inner and outer steel pipes are connected through the rubber ring,bonded by a thermal vulcanizing agent.The new flexible seismic brace can dissipate energy through dislocation between inner steel pipe,outer steel pipe and rubber ring,thus playing the effect of adaptive resistance to local stress,which embodies the action principle of viscoelastic damper.ABAQUS is used to carry out statics and dynamics analysis of traditional and flexible seismic supports and hangers to analyze the mechanical properties and related parameters of the new seismic supports and hangers.The main research contents are as follows:The static analysis of traditional and new flexible seismic supports and hangers is carried out by using ABAQUS in this paper.The results show that,compared with the traditional antiseismic support hanger,under the same displacement load excitation,the seismic inclined brace in the new flexible anti-seismic support hanger does not have the phenomenon of larger local stress,the overall stress cloud map distribution is more uniform,and the utilization rate of materials is higher.The overall structure is safer.And the hysteretic curve of the new flexible seismic support hanger is relatively full,and the envelope area is larger,indicating that the new flexible seismic support hanger has better energy dissipation and ductility,and is more suitable in practical engineering.The effects of different parameters such as inner steel pipe length,outer steel pipe length,outer steel pipe thickness,rubber ring thickness and flexible inclined brace installation angle on the mechanical performance of the new flexible seismic hanger are analyzed and studied by using ABAQUS.The results show that among these parameters,the installation angle of oblique brace has the greatest influence on the force of anti-seismic support hanger,followed by the thickness of outer steel pipe,and then the thickness of rubber ring.The other parameters(the length of inner steel pipe and the length of outer steel pipe)have no significant effect on the seismic bracing strength and the mechanical properties of the hanger.This paper also makes a comparative analysis of the seismic force loading dynamics of the traditional and new flexible anti-seismic support hanger pipeline system by using ABAQUS.The results show that under the same seismic force,the stress and acceleration of the new flexible anti-seismic hanger pipeline system are lower than that of the traditional hanger pipeline system.The pipeline installed with a new type of flexible seismic support hanger is not easy to crack in practical application,and its life is longer than that of the traditional antiseismic support hanger pipeline system.Compared with the traditional anti-seismic support hanger pipeline system,the pipeline installed with traditional seismic support hanger is more likely to be damaged in practical application.To sum up,compared with the traditional seismic support hanger,the new type of flexible seismic support hanger is softer in structure and better in performance,which is shown in that it does not have the phenomenon of stress concentration and the overall force is more uniform.and it has better energy dissipation and ductility.