Research On Vulcanization Temperature Field Of SVED And Seismic Performance Of Reinforced RC Frame Structure With SVED

Investigations of previous major earthquakes have shown that the structural damage and collapse caused by strong earthquakes have caused heavy losses.How to reduce the seismic damage of the structure has always been the focus of attention and research in the engineering and academic circles.The sector visco-elastic damper(SVED)is arranged in the structure to dissipate seismic energy so as to achieve the purpose of reducing structural damage.SVED uses nitrile rubber as an energy dissipating material.The completeness and uniformity of rubber vulcanization has a great influence on the performance of visco-elastic damper,especially for the vulcanization of the thick rubber layer of SVED.In this paper,the vulcanization temperature field of SVED rubber and the influence of SVED’s structure layout on energy dissipation are studied.First,through the rubber material experiment,the density,specific heat capacity and thermal conductivity parameters of the rubber used in the SVED are measured,and the ABAQUS finite element software is used to import the measured rubber parameters to simulate the SVED with a rubber thickness of 10 mm,and use the previous check and adjustment of the actual vulcanization of 10 mm thick rubber.Secondly,based on the vulcanization temperature field and vulcanization effect of SVED with a rubber thickness of 10 mm,the vulcanization temperature and vulcanization time of 13 mm and 16 mm thick rubber layers were studied,and the most suitable vulcanization conditions for rubber layers of two thicknesses were obtained.The results show:(1)When the 10 mm thick rubber layer of SVED is vulcanized,its temperature field has a large temperature gradient,and its lowest temperature interface appears in the middle and the part extending to the middle sector steel plate,and is elliptical.When the vulcanization temperature is 140°C,the vulcanization time is 1800 s,and the vulcanization pressure is 15 MPa,the 10 mm thick rubber layer of SVED reaches positive vulcanization.(2)The suitable vulcanization temperature for the 13 mm thick rubber layer is135℃,and the vulcanization time is 2500 seconds;(3)The suitable vulcanization temperature for the 16 mm thick rubber layer is125°C,and the vulcanization time is 4500 seconds.Therefore,a hybrid experiment method combining physical experiment and simulation experiment is used to study the vulcanization temperature field of different thicknesses of SVED rubber layer to optimize the vulcanization conditions.Finally,PKPM software and ABAQUS software are used to study the seismic performance of the 5-story RC frame structure.El Centro seismic waves,Taft seismic waves and RH1TG040 artificial seismic waves were selected to study the seismic resistance and damping performance of the original structure,SVED flat-angle layout structure and SVED diagonal layout structure under frequent earthquakes,fortified earthquakes,and rare earthquakes.The results show:(1)The frame joints bear greater stress and are more prone to earthquake damage.Setting SVED here can effectively dissipate seismic energy and reduce structural deformation.(2)Setting SVED can effectively reduce the structure’s base shear,vertex acceleration,interlayer displacement and structural damage.(3)Under fortifications and rare earthquakes,the SVED diagonal layout dissipates more energy and is more reasonable and effective than the straight-angle layout.Therefore,the use of SVED to strengthen the RC frame structure can improve its seismic performance and reduce earthquake damage.The paper has 66 pictures,21 tables,and 91 references.