The Research Of The Mechanical Property And Calculation Method For Masonry Structure Strengthened With FRP

The history of masonry structure is long. The structure is important and irreplaceable in building structures. But at present, a large number of masonry structure is at stage of losing effective safety and functionality degrading. Deconstruction this amount of masonry structure or reconstruction of a large number of building structures will either produce resource waste or create serious environmental problems. Therefore, our country has stepped into a stage of strengthening and rehabilitating current engineering structures. FRP is of the advantages of high strength, high effective, easy construction, good anti-corrosion, light weight, and fitting structural strengthening for various structures. It very fits the requirement of the strengthening of masonry structure. However, the research of the mechanical property of the strengthened structure is relative little, therefore, this dissertation presents the research of the mechanical property of strengthened masonry structure by FRP sheet., the shear property of masonry wall strengthened by FRP sheet and the reliability of the masonry column strengthened by CFRP, the main research contents of this dissertation is as following:Through testing 12 compressive masonry members strengthened with FRP and 3 comparative members, studying compressive property and results of masonry structure strengthened by FRP sheet. Through double shear tests to 15 masonry structure strengthened by FRP, studying the shear property and results of masonry structure strengthened with FRP. Through 4-points planar bending tests to 4 un-strengthened masonry members and 6 strengthened masonry members with FRP at the tensile surface, studying the bending property and results of masonry structure strengthened with FRP.The compressive tests were conducted to 7 groups of masonry column members strengthened with GFRP,3 groups of masonry column strengthened with CFRP, and 1 groups of compressive members, among them, each group has 4 members. Observing the failure progress and final failure mode of the members. Analyzing the effects of different length/width ratio, different type of FRP and different amount of FRP to the limit bearing capacity of the strengthened masonry column and its deformation.The shearing tests were conducted to 5 GFRP strengthened masonry wall members,2 CFRP strengthened masonry wall members and 1 comparative members. Observing the failure progress and final failure mode. Analyzing the different adhesion surface and different adhesion direction to the cracking loads of the wall, shear bearing capacity, deforming ability, energy consuming and failure mode, putting forward calculation formula of shear capacity of FRP strengthened brick wall members.Combining reliability theory, through theoretical derivation, taking brick strength, mortar strength, member's geometric size and load effect value as basic random variables, establishing the reliable calculation formula of CFRP strengthened brick built column under axial compression. Using MATLAB program to conduct reliability analysis. The reliability index of the axial compression members strengthened with CFRP at the front, the back, the upper and the lower were conducted.