Study On Shear Strength Of Bonding Interface Between Steel Plate And Anti-condensation Material In Warehouse

Food security has always been the top priority of China's governance.Underground silos are ideal for green grain storage due to their advantages of concealment,sturdiness,fire prevention,light avoidance,airtight low temperature,low construction cost and less floor space.However,the problems of waterproof and moisture-proof caused by long-term erosion and immersion of groundwater have seriously restricted the underground silos.The underground silo with lining steel sheet can solve the waterproof problem of underground silo well,but because of the strong thermal conductivity of the steel sheet itself,it is easy to lead to grain condensation in the storage process.Based on this,taking a certain underground warehouse as the research background,the shear test of the interface between the lining steel plate and the anti-condensation material under different adhesive areas and different stress states was conducted.Therefore,this paper aims to avoid grain condensation in the underground silo with lining steel sheet in the storage process to ensure food security.?1?The steel-clay brick in the adhesive area of S?240 mm×115 mm?,0.8 S,0.5 S single shear test and the vertical shear and the shear test under the action of lateral load.The test results show that as the adhesive area decreases,the ultimate load of the steel plate-clay brick gradually decreases,and the average shear strength of the interface gradually increases.In the single shear test,the adhesive area changed from S to 0.5S,the ultimate load decreased by 9.05%,and the average shear stress at the interface increased by 45.69%;in the shear test under the combined action of vertical shear and lateral load;The adhesive area changed from S to 0.5S,the ultimate load decreased by 20.57%,and the average shear stress at the interface increased by 59.81%.The reduction of the adhesive area has no effect on the test failure mode,both of which are peeled off by the AB glue of the clay brick and epoxy dry hanging structure.?2?The single-sided shear test of the steel plate-aerated concrete block with the adhesive area of S1?185mm×150mm?,0.8S1,0.5S1 and the shear under the combined action of vertical shear and lateral load test.The test results show that with the decrease of the adhesive area,the ultimate load of the steel plate-aerated concrete block gradually decreases,and the average shear strength of the interface gradually increases.In the single-sided shear test,the adhesive area changed from S1 to 0.5S1,the ultimate load was reduced by 43.58%,and the average shear stress at the interface increased by 12.71%.In the shear test under the action of vertical shear and lateral load,the adhesive area changed from S1 to 0.5S1,the ultimate load was reduced by 28.83%,and the average shear stress at the interface increased by 42.35%.The reduction of the adhesive area has no effect on the test failure mode,both of which are stripping of the aerated concrete block and the epoxy dry-hanging structure AB glue.?3?The ultimate load and the average shear strength of the shear test of the steel plate-clay brick and steel plate-aerated concrete block under the combined action of vertical shear force and lateral load are significantly improved compared with the single-sided shear test.Comparing the results of the two different shear tests,the ultimate load of the interface between the steel plate and clay brick increased by more than 90%,and the ultimate load under the S area increased the most,by 95.02%.At most,an increase of 95.52%.The ultimate load of the steel plate-aerated concrete block interface is increased by more than 100%,and the area of 0.5S₁ increases the most,which is 172.90%;the shear strength of the steel plate-aerated concrete block interface is increased by more than 100%,of which 0.5S₁increased the most,an increase of 172.93%.?4?When the steel plate-clay brick and the steel plate-aerated concrete block are in the same stress state and different adhesive areas,the load-displacement curve changes are basically the same,and the load changes linearly with the increase of displacement.As the adhesive area decreases,the smaller the peak load,the earlier the peak appears.The slope of the load-displacement curve of the steel plate-clay brick before reaching the peak gradually increases with the decrease of the adhesive area,and the slope of the load-displacement curve of the steel plate-aerated concrete block before the peak reaches the adhesive area decreases gradually reduced.?5?Using the finite element software ANSYS to simulate the shear test of steel plate-clay brick and steel plate-aerated concrete block,The results show that by simplifying the finite element model,the load-displacement curve simulation results of steel plate-clay brick and steel plate-aerated concrete block are basically consistent with the test results.The maximum deviation between the simulated limit value and the test value is-4.08%,and the minimum deviation is-1.21%.Except for the shear test of the steel plate-aerated concrete block under the vertical and lateral loads,the rest are negative deviation.The maximum deviation between the simulated value and the test value is the shear test of the clay brick with the adhesive area S under the vertical shear force and lateral load.The displacement at the 4.8mm displacement is 11.34%.It shows that the method of modeling in this paper is effective,and it can provide a reference for the actual project in the later stage.