The Strength Theory Study And Finite Element Analysis Of Plant Fiber Reinforced Concrete Block Masonry

Using agricultural and industrial wastes as raw materials, plant fiber reinforcedconcrete block is an ideal building wall material with good mechanical property,thermal property and masonry performance. However, few research was conducted athome or abroad about this kind of material. There are still many gaps in the field andsome problems to be solved which directly hinder the promotion of the use of thiskind of block. Based on the experimental study, a comprehensive and systematictheoretical research and the finite element analysis related to it was conducted aboutits axial compressive and shear strength properties.Based on the experimental study on masonry specimen under static axialcompressive, further analysis was made about the masonry compression failure form,cracking load, ultimate bearing capacity and deformation properties. The resultsshowed that the plant fiber reinforced concrete block masonry exhibit brittle featureobvious that is similar to ordinary concrete block masonry. Through analysis on theinteraction between block and mortar, considering the influence of various factors,using the stress method established compressive stength formula. Using the theory fordamage established the constitutive relation which reflected the decreasing trend ofelastic modulus well as strain increasing. The calculation formula for poisson’s ratiowas obtained through the regression analysis on experimental data. All the caculatedresults above were consistent with the experimental results. Based on theexperimental and theoretical studies, using ABAQUS made the nonlinear finiteelement analysis on axial compressive specimens of masonry. Then proposed a finiteelement model that was suitable for the analysis and the method of modeling.Obtained the stress-strain curve, stress and strain contours, displacement, deformationand some other results. Presented the process of the crack evolution and got someconclusions that were difficult to get during the experiment. The results of finiteelement analysis were in company with the result of experimental ones which showedthat concrete damaged plasticity model is capable of simulating nonlinear problemsof concrete block masonry under axial compressive. Through the study on shear strength of the bed joint of masonry specimens,also made an analysis about shear failure mode and failure characteristics. Using theprinciple of minimum dissipation of energy and considering influence of the pin keybetween masonry and mortar, built a shear strength formula of the hollow blockmasonry. The result was in company with the test result that block masonry was beatby a rubber hammer. Simultaneously established the formula for calculating shearstrength of masonry under composite pressure and shear forces. Thus the threedamage forms of the masonry under pressure and sheer was represented by a singleformula. Based on the experimental and theoretical studies, using ABAQUS made thefinite element analysis on shear specimens of masonry, promoted the finite elementmodel that was suitable for the analysis. Obtained the damage feature of bed joint,stress and strain distribution of mortar, limiting shear stress and other results. Thereason why the upper bed joint was easily destroyed than the lower one was proofedthrough theoretical analysis. The results of finite element analysis were in companywith the result of experimental ones which showed that Mohr-Coulomb model iscapable of simulating the destroying of masonry under pure shear force.The research methods of the theoretical study on compressive strength,constitutive relations, nonlinear finite element analysis and the finite element analysisof masonry under shear can be used as reference to similar studies. there is certainreference value of those research results which can be used on study or practice.