Experimental Study And FEM Analysis Of New Horizontal-hole Hollow Block Masonry On Local Compression

With the prohibition of clay brick and the rapid development of the concreteblock, the traditional vertical-hole hollow blocks are widely used, but the traditionalblocks still have “hot, crack, seepage, et “problems. This thesis proposes a newhorizontal-hole hollow block with a series of advantages, such as thermal insulation,heat insulation, crack resistance, impermeability, convenient layout of the pipeline,lightweight, environmental protection, dry masonry and anti-seismic, etc. A largenumber of studies on basic mechanical properties of masonry anti-seismic have beendone by our Research Group. The performance of the new horizontal-hole hollowblock masonry under local compression was studied by experimental research andfinite element analysis on the basis of preliminary studies. The main research contentsare as follows:First of all, the thesis got the failure modes, horizontal and vertical deformation,cracking load, failure load, and local compressive mechanism by the middle, end andcorner positions of uniform local compression experimental study of newhorizontal-hole hollow block masonry. Local compressive cracking strength and thelocal compressive strength were respectively regressed by the cracking load andfailure load of this three positions, then a new unified formula of local bearingcapacity of the new horizontal-hole hollow block masonry on local compression fornormalized was brought up in the thesis.Secondly, it was studied how to improve local compression performance bymasonry with padded beam or with pouring belt central uniform local compressionexperiment. Studies shows, the local bearing capacity can be greatly improved withthe padded beam, the cracking load was improved with pouring belt. The better localpressure properties can be gained when pouring belt was set in the first or secondblock location. The theoretical formula was put forward by the theoretical derivationof the local bearing capacity of masonry with structural column, of which localcompressive bearing was also greatly improved.Finally, full scale experimental model of the central and end local compressionpositions have been analyzed with FEM ANSYS. Based on the analysis results, thestress and crack distribution, the local compressive strength and stress-strain curve ofthe masonry have been got. And also compared with experimental results, both are in good agreement, which illustrates the working mechanism of the local compression ofthe masonry.