Numerical Simulation of FRP Retrofitted Masonry Wall by 3D Finite Element Analysis

摘要

This paper presents a simplified macro-mechanical models for both brick-mortar and brick-FRPrninterface in masonry wall. Model equations for Finite Element Analysis are chosen in such a wayrnthat only primary variable in those equations is the internal strain that comes from the incrementalrnstrain as input parameter during the loading steps of FEA. The interface is proposed as a zerornthickness plane element where the brick unit itself is of 20-nodes solid element and FRP as 8-nodesrnshell element. The model equations were derived from phenomenological concept of load-reactionrnfor masonry shear wall that can fully capture both the pre-peak and post-peak behavior of masonryrnwall. Model equations were carefully formulated for loading, unloading and reloading that can bernexperienced during the loading process. Modern concept of Elasto-Plastic and Fracture(EPF) modelrnfor non-linear plasticity is implemented in those equations for work-hardening behavior of thernconstituent materials and interface, where as the softening process itself was translated through nonlinearrnequations that conform some of the experimental stress-strain curve. Finally the results fromrnthe analysis are compared with the experimental data that are available on some authentic literaturesrnand they show good agreements. Some discrepancies were observed due to absence of sufficientrnexperimental clarity. After successful completion of the analytical part of this study, arncomprehensive experimental work of our own will be followed.