Study On Structural Mechanical Performance And Design Method Of New Energy-saving Shale Fired Blocks

The new energy-saving shale fired blocks were developed during the eleventhfive-year plan, which the single wall material satisfied the energy saving target of65%,and the production line which is the first in the domestic and the largest in the worldwas built, thus the good foundation which the new energy-saving shale fired blocksapplied in our country and the development of international cooperation is established,but due to the limitation of time and application conditions, the mechanical properties,seismic performance and design method were not studied.The experimental study on the new energy-saving shale fired blocks which includeshale fired heat-insulation block and shale fired compound exterior wall heat-insulationmaterial are developed in the paper, and the suggestions of design method are proposedaccording to the experimental research results, and the research results can providesupport for the promotion and application of new energy-saving shale fired blocks. Inthe paper, the concrete research contents are as follows:(1) Experimental study on mechanical properties of shale fired heat-insulationblock masonryThe experimental study on compressive property and shear property of shale firedheat-insulation block masonry are developed, and the basic mechanics performanceindexes are obtained, and the damage characteristics, damage mechanism, deformationperformance are analyzed, and the stress-strain relationship formula, the elastic moduluscalculation formula, the proposal value for the poisson’s ratio are given. In addition,through the shear-compression experiment of shale fired heat-insulation block masonryfor29row holes, the basic characteristics of shear-compression damage is mastered, and the static shear strength formula was proposed.(2) Experimental study on seismic behavior of shale fired heat-insulation block forthe load bearing wallsThrough the low-cycle reversed loadings experiment for10full scale shale firedheat-insulation block walls, the failure pattern and failure characteristics for the wallswere analyzed, meanwhile the seismic performance indexes for the walls are analyzedand calculated which include hysteretic curve, skeleton curve, ductility, dissipationcapacity, stiffness degradation, the seismic shear capacity, and the restoring force modeland collapse resistance for the walls are analyzed, finally the seismic shear capacityformula for shale fired heat-insulation block walls is proposed, the research results canprovide the experimental datas and theoretical support for promotion and application ofshale fired heat-insulation block.(3) Out-of-plane shaking table experimental study of frame infilled wall with shalefired heat-insulation blockThrough the out-of-plane shaking table experiment of4full scale frame infilledwalls with shale fired heat-insulation block, the characteristics of the model structurereaction are studied in the El-Centro wave, Taft wave, Tianjing wave and DoubleEl-Centro wave. The influence on the construction measures between the filling walland frame structure for the out-of-plane seismic behavior of model structure is analyzedby frequency, acceleration, relative displacement and rebar strain response, finally theconstruction measure of flexible connection between the filling wall and frame structureis proposed in the actual project, and the distance of connecting band is not more thanthe height of five leather block and the distance of connecting rebar is selected for1meters.(4) Out-of-plane shaking table experimental study on shear wall with WDFinsulation systemThrough the out-of-plane shaking table experiment of4full scale shear wall withWDF insulation system, the characteristics of the model structure reaction are studied inthe El-Centro wave, Taft wave, Tianjing wave and Double El-Centro wave. Theinfluence on the arranged quantity and form of anchor bolt for the out-of-plane seismicbehavior of model structure is analyzed by frequency, acceleration, relative displacement and rebar strain response, finally the construction measure in the top ofshear wall should is strengthened in the engineering design, for example, increased thequantity of anchor bolt etc.(5) The rigid frame-equivalent single brace mechanics model of shale firedheat-insulation block wallsOn the basis of the low-cycle reversed loadings experiment for shale firedheat-insulation block walls, the rigid frame-equivalent single brace mechanics model ofshale fired heat-insulation block walls is proposed, and the model is analyzed for theelastic stage and elastic-plastic stage through the finite element analysis programSAP2000. The formula for the effective width of equivalent single brace is proposed,and the basic attribute of equivalent single plastic hinge brace is determined. Theformula for the yield strength and the yield displacement of equivalent single brace isproposed, and the force-displacement constitutive relation is determined. Finally, Bycompared with the test results and findings, the model in the paper can reflect thecharacteristics of the prototype structure.(6) Study on structure design method of the new energy-saving shale fired blocksThrough the experimental study results, data in engineering practice andspecifications, it is proposed including the strength design indexes of shale firedheat-insulation block masonry, the seismic design method of shale fired heat-insulationblock walls and the structure technology and construction technology of the newenergy-saving shale fired blocks. The basic parameters are provided for technicalspecification for shale fired heat-insulation block masonry structure, construction atlasfor shale fired heat-insulation block masonry structure and construction technologyspecification for the new energy-saving shale fired blocks, the research results canprovide basis for promotion and application the new energy-saving shale fired blocks.