Report - PEER - University of California, Berkeley

Table 1. Performance criteria for confined masonry structures with solid clayunitsLimit stateCriterionResidual crack Drift angle,width, mm %Serviceability Onset of masonry inclined cracking(cracking strength)0,1 0,15Reparability Inclined cracking fully formed over 2 0,25masonry wall; hairline cracking intotie-columns; onset of masonrycrushingSafety Shear strength of wall; wall 5 0,40cracking penetrates into tie-columnends; yielding of tie-columnreinforcement due to shearing; onsetof tie-column crushingVRehabilitationD crD MD 80D0.1 2 5 15Crack width, mmEpoxy resinEpoxy mortar InjectionCement mortarJacketingBar insertionReplacement (brick / concrete)Figure 5. Typical rehabilitation schemes considered for confined masonrystructures.4.2 Seismic Evaluation through Shaking Table TestsIn order to assess the seismic performance of typical confined masonry houses, aswell as to evaluate the performance criteria and the analysis model developed, a seriesof shaking table tests have been carried out. Details of the testing program and mainresults can be found elsewhere (Alcocer et al., 2004). Specimens were half-scalemodels of one- (M1) and three-story (M3) houses constructed in Mexico. Walls weremade of hand-made solid clay bricks. Dimensions and wall layout of M3 are shown inFig. 6. Two earthquake motions recorded in epicentral regions in Mexico were usedas basis for the testing program. One was the motion recorded in Acapulco, Guerrero,240