The Testand Analysis On Seismic Performance Of Recycled Aggregate Thermal Insulation Concrete Shear Wall With Different Shear Span Ratio

The recycled aggregate thermal insulation concrete is a new buildingmaterial which is made of recycled concrete and thermal insulation glazedhollow bead concrete, that can make use of waste concrete and the thermalinsulation properties of concrete, to achieve building energy efficiency andwaste utilization. The green concrete comply with the development of the timesand in line with national development policies, which will have a broad spacefor development. In this paper, the research group combined the cyclic load testwith numerical simulation to research the seismic performance of recycledaggregate thermal insulation concrete shear wall, which based on the research ofmaterial performance of recycled thermal insulation concrete. The maincontents include the following aspects:1. On three different shear span ratio of recycled aggregate thermalinsulation concrete shear wall for low-frequency cyclic loading tests, to make acomparison of the shear span ratio about seismic performances, such as failuremodes, bearing capacity, ductility, stiffness degradation, hysteretic behavior andenergy dissipation capacity, which based on recording and analyzingexperimental data collation.Test and analysis results show that:1) The cracks on the shear walls distributed more dense with the increase ofshear span ratio, high wall (GSW1-1) tends to occur ductile good bending failure, low wall (GSW3) occurred chemotaxis brittle shear failure in the band,and the wall (GSW2) with crack distribution center, somewhat curvedscissors-type damage.2) The bearing capacity of recycled aggregate thermal insulation concreteshear wall improve with decreasing shear span ratio, GSW3ultimate load wasincreased by78.6%,44.1%relative to GSW1-1, GSW2. Ko, Kc, Ky, Kuhaddifferent degrees of increasement, which had0.85times,1.50times,3.39timesand1.23times of GSW3relate to GSW1-1,showing that decreasing shear spanratio can effectively improve the stiffness of shear wall. The stiffness of smallshear span ratio (λ≤1.05) recycled aggregate thermal insulation concrete shearwalls decay rapidly after yielding, and witch destruct suddenly, the stiffness oflarge shear span ratio (λ≥2.05) shear walls change slowly after yielding, latestiffness is stable, and get great plastic deformation before significant damageomen.3) The ductility of recycled aggregate thermal insulation concrete shear wallincreases with the increase of shear span ratio, showing that shear deformationcapacity enhanced, but the θp, μ of GSW2and GSW3almost the same,indicating that the affect of the ductility to the high and low shear wall was notobvious; the shear hysteresis curve was more plump, surrounded by a larger area,indicating that the ability to increase energy of seismic performance was betterwith shear span ratio increases.2. Using the existing formula specification to calculate bearing capacity ofrecycled aggregate thermal insulation concrete shear wall, and comparing thetheoretical and measured values, the results showed that: the calculation and theexperimental measured values are closer, and the relative error is less than10%,showing that the formula which suggested is fit for recycled aggregate thermalinsulation concrete shear wall.3. Using ABAQUS to analyse the recycled aggregate thermal insulation concrete shear wall with5different shear span ratio, showing the destructionprocess of shear walls through shear strain contours, equivalent stress contoursto obtain shear load values and displacement values of each specimens. Thesimulation results show: the simulation and experimental values had a goodmatch, which can simulate seismic performance effectively of shear wall. Largeshear span (λ≥2.05) shear wall had good ductility and energy dissipationcapacity, the damage somewhat bending failure, small shear span (λ≤1.05)shear wall had a poor ductility, which can not fully dissipate energy, prone tobrittle shear zone destruction, so the actual project should be avoided. Largeshear span shear wall has better ductility and greatly enhance the ability todeform, but reduced largely in bearing capacity, so the actual engineering designshould weigh the pros and cons of integrated between ductility and bearingcapacity to seek the highest point of balance, in order to achieve optimal design.