Research On Seismic Response Of Indoor Gas Pipeline In RC Frame Structure

Non-structural components refer to all components in the building system except structural components,and indoor pipe system is an important part of non-structural components.Indoor pipe systems include water supply and drainage,gas,ventilation,fire fighting,heating pipe system.For containing a large amount of flammable and explosive gases,leakage of the gas pipeline may cause serious accidents such as fire,poisoning,and explosion.Once the gas pipeline is damaged in the earthquake,it may lead to a secondary disaster with extremely serious consequences.GB50011-2010 stipulates that the seismic fortification target of non-structural components that may cause secondary disasters should not be lower than the main structure.Therefore,in the design of indoor gas pipeline,the seismic design should be paid special attention to ensure that the seismic fortification target should not be lower than the main structure.Reinforced concrete frame structures are widely used in middle and high-rise buildings in China due to their advantages of flexible layout,large indoor space,light weight and mature calculation theory.A full-scale shaking table test and an ANSYS numerical simulation are used to analyze the seismic response of the gas pipeline in the RC frame structure.The main research contents are as follows:1.The design completed a full-scale two-story RC frame structure and indoor gas pipeline shaking table test.Galvanized steel pipe,304 thin-walled stainless steel pipe and PE pipe were selected as the pipes.Epoxy resin,batched jute and asbestos cement were selected as the fillers.El-Centro wave,Chichi wave and San Fernando wave were selected to input ground motion at different levels to the test model.The effect of different combinations of pipes and fillers on the seismic responses of the gas pipeline is studied.2.Analyze and summarize the phenomena of the main structure and the gas pipeline system under various working conditions.The results showed that the damage of the gas pipeline system was mainly affected by the seismic response of the main structure,and there was no obvious damage on the pipe itself.The destruction of the pipeline system was mainly concentrated in the connection between the pipeline and the main structure.The acceleration data and displacement data collected in the experiment were processed and analyzed.The results showed that different combinations of pipes and fillers caused a significant difference on the seismic response of the gas pipeline under strong earthquakes.The seismic response of metal pipes in rigid fillers was greater than that of flexible fillers,and the seismic response of plastic pipes in flexible fillers was greater than that of rigid fillers.3.The numerical model of the test model was established by the finite element software ANSYS,the seismic response results of the test model and the numerical model were compared,and the ANSYS simulation method and shaking table test were mutually verified.Validated numerical model was used to study the effect of the pipe strap on the seismic response of the gas pipeline and the seismic response characteristics of the gas riser.It was found that both the quantity and stiffness of pipe strap can compensate the stiffness of indoor gas pipeline system.The gas riser was a hybrid sensitive component,whose seismic response was affected by inertia force and deformation.