In-plane Mechanical Properties Of New Energy-saving Infill Walls

Still now, energy-saving panels made of rice husk have been used as a new type ofinfill wall, which is characterized by light weight, good insulation properties. Gao Gebuilding material company in Hei Longjiang province made full use of local material,put some admixtures such as rice husk into the traditional mortar to form rice huskmortar. Infill walls made of rice husk mortar have been used in a six-storey frame. Fromthe heat transfer experiment result of test house with energy-saving panel, we can get aconclusion that the panel made of rice husk has good insulation properties. Whilein-plane mechanical properties of new energy-saving infill walls is still unknown. Theauthor conducted the following studies in order to find the panel’s in-plane mechanicalproperties and the relationship between infill walls and the dynamic properties of frame.The author designed some experiments to determine the mechanical properties ofrice husk mortar, such as cube compressive strength test, axial compressive test andcube splitting tensile test. Evaluated the ability of the material’s freeze-thaw resistancemeasured by the mass loss rate and the dynamic elastic modulus loss rate with the rapidfreezing and thawing method. Designed two quasi-static tests for full-scale panels andsix uniaxial loading tests for full-scale panels. Experimental data obtained through theexperiment above includes ultimate load, ultimate displacement and hysteresis curve.We can evaluate the lateral force resisting ability and energy dissipation capacitythrough the experiment data.Based on strain data from the panel test the author did some data analysis in orderto define the working status by the strain data. Strain from a single point in differentloading periods stood for the local area’s status of the panel. Meanwhile, took the straindata in different loading periods as a vector. Analyzed the correlation of these vectors,which stood for the overall status of panels in different loading periods.The author simulated the husk mortar model beam flexural tests with ANSYS andOpenSees. Obtained a reliable finite element model through comparing the simulationresults and experimental data. Follow the beam’s simulation way, made a FEA model tosimulate uniaxial loading tests for full-scale panels. From the simulation result we canget the ultimate load, ultimate displacement of the panel.Set equivalent bracing models for infill walls basing on the experimental data. Theequivalent model was set in6storey frame OpenSees model for modal analysis,pushover analysis, time history analysis. By comparing finite element analysis results oftwo structural forms, we can get the clear and detail impact of the infill wall on framestructure’s dynamic properties.On this basis, the author selected20representative seismic waves to find structuralprobabilistic seismic demand. On the basis of the demand analysis, carried out vulnerability analysis for a rigid connection frame, a flexible connection frame. Theresults verified that construction measures prefer flexible connection as the code says.Results of incremental dynamic analysis show the changes in the structural properties indifferent intensity earthquake period.