Vibration Resistance Characteristics Of Seismic Bracing System For Building Pipeline

The damage of building structure and non-structural components in earthquake can lead to the decline and loss of the building function.In modern public buildings,the economic loss caused by the destruction of non-structural components have been higher than structural components.Pipeline-seismic bracing system is an important non-structural component,whose function is to limit the pipeline displacement during earthquake and reduce the probability of pipeline functional failure after earthquake.Once the pipeline-seismic bracing system is damaged,it is often apt to induce secondary disasters such as pipe network leakage,gas leakage and fire.At present,the seismic research of building structure is in the mature stage of development,and the seismic research of non-structural components is still in the stage of development.Therefore,it is important to study the vibration resistance and resilience of pipeline-seismic bracing system.In this paper,from the common rigid seismic bracing and flexible seismic bracing,the simulation experiments were carried out to study its anti-vibration performance and mechanism,and the post-earthquake recoverable evaluation index of pipeline-seismic bracing system was established on the basis of vulnerability analysis,to explore the resilience of pipeline-seismic bracing system.The main research includes the following aspects:1.Taking the common lateral rigid seismic bracing of clamp tube hoop as the research object,the modal analysis and seismic analysis were carried out by using the vibration decomposition surface reaction spectrum method by the finite element simulation software ANSYS,and the seismic performance of the seismic bracing and the influence degree of the components of the bracket on the overall performance were studied respectively.The results show that seismic bracing can slow down the seismic response by changing the modal frequency of the pipeline system,and the seismic displacement response of the pipeline system with seismic bracing will be effectively alleviated.In addition,the installation specification of the seismic bracing will also have an impact on its seismic performance.The fastening C-type groove steel at the suspension rod can effectively increase the seismic performance of the boom and alleviate the displacement response at the pipe clamp.The mounting length of the boom has a certain influence on the suspension part of the seismic bracing.The change of mounting dimension of C-type groove steel fastened at the hanging rod only affects the seismic displacement response of the boom and tube clamp in the bracket to a certain extent.But these installation factors do not affect the seismic displacement response of the pipeline.2.Taking the four-way flexible seismic bracing of wire rope as the research object,the equivalent model was carried out,and the vibration simulation test of the equivalent model,2D Roberts Linkage,was carried out to study its vibration isolation mechanism.The results show that the four-way flexible seismic bracing of wire rope can effectively slow down the vibration in the horizontal direction.Under exterior excitation,the four-way flexible seismic bracing of the wire rope can achieve the purpose of low-frequency vibration isolation by the flexible effect of wire rope and the symmetrical structure which can realize the physical pendulum function.And the position of the connecting point between the screw and the ceiling in the four-way seismic bracing have effect on the natural frequency of the bracket.3.The damage degree,recoverable degree,importance coefficient,recovery sequence coefficient,recovery difficulty coefficient and post-earthquake recovery reinforcement of pipeline-seismic bracing system were defined,based on the vulnerability analysis.And the post-earthquake recoverable evaluation system of pipeline-seismic bracing system was established to provide theoretical guidance for the post-earthquake recovery and reinforcement of non-structural components.