Experimental Study On Seismic Performance Of The Thermal Insulation Glazed Hollow Bead Concrete Column With Different Axial Compression Ratio

Thermal insulation glazed hollow bead concrete is a new type of inorganicinsulation concrete.It is light but has good bearing capacity.It can not onlyprovide good heat insulation but also fire prevention.The weight of the buildingusing this kind of concrete is weight which can improve its seismicperformance.What’s more, its load-bearing structures realize self insulation.Andthe good fireproof performance can improve the safety of combatreadiness.Above all,it is the overall thermal insulation system in accordancewith green building standards.Under the background of earthquake-prone andgovernment called on energy saving and emission reduction, the thermalinsulation glazed hollow bead concrete must have wide applicationmarket.But,currently,research about this concrete mainly focus on materialproperties and there is no structural criterion to guide the application.So thispaper studies the seismic performance of thermal insulation glazed hollow beadconcrete columns with different axial compression ratio taking pilot projectwhich is frame-shear wall structure in Jincheng,Shanxi province as prototype byboth low cyclic loading test and computer simulation.The main work is asfollows:1.Testing the basic mechanical properties of the thermal insulation glazedhollow bead concrete to make a foundation for the structural test and simulationanalysis.It Includes axial compressive strength, flexural strength and elastic modulus.2.Low cyclic loading tests of four frame columns are done.The fourcolumns are the same size and reinforcement ratio.And three of them is made ofthe thermal insulation glazed hollow bead concrete but the other one is made ofordinary concrete as compared.The axial compression ratio are designed as0.05,0.20and0.35for them.The results show that the crack of the specimen is mainlyhorizontal fractures.And the axial compression ratio is smaller, the crackdeveloping upward is higher.In short, the failure mode of the specimens belongsto bending failure.3.It can get the difference of bearing capacity and seismic performancebetween the thermal insulation glazed hollow bead concrete columns and theordinary concrete column by processing the experimental data.From the result itcan also get bearing capacity, hysteresis characteristics, skeleton curve, ductilitycoefficient, energy dissipation capacity based on which can study on theinfluence of axial compression ratio on the seismic performance of the thermalinsulation glazed hollow bead concrete columns and give some designproposals.The analysis results show that compared with the ordinary concretecolumn the bearing capacity of thermal insulation glazed hollow bead concretecolumn is almost the same,ductility coefficient is increased by19.35percent andthe total energy consumption is increased by116percent.What’s more,thehysteresis loop is more plump and the descending segment of the skeleton curveis more gentle.Above all,the thermal insulation glazed hollow bead concrete ismore suitable for using in seismic structures.When the axial compression ratio isbetween0.05and0.35, the larger the axial compression ratio is, the larger thebearing capacity is, the smaller the ductility coefficient is,and the worse theenergy dissipation capacity is.4.The four specimens are simulated by ABAQUS which is a kind ofnonlinear finite element analysis software.The correctness of model parametersand the reliability of finite element analysis are checked by comparing the simulation results and test results.After that the other three thermal insulationglazed hollow bead concrete columns with axial compression ratio of0.10,0.30and0.40are simulated using the checked model.Comprehensively consideringthe bearing capacity and the ductility coefficient,it suggests that the axialcompression ratio of these columns whose concrete strength grade is C35arebetter design as0.10~0.30.And within this range,bearing capacity is basicallylinear growth with the increase of axial compression ratio.It gets the fittingformula even more.But The bearing capacity is almost no longer change eventhe axial compression ratio increases when it exceeds0.35.