Libros y capítulos de libro

IN CHILE, THE CONSTRUCTION SYSTEM OF CROSS-LAMINATED TIMBER PANELS (CLT) IS EMERGING AS AN ALTERNATIVE TO ACHIEVE THE GOALS OF SUSTAINABLE CONSTRUCTION IN A COUNTRY WITH HIGH SEISMICITY. THE STIFFNESS OF THIS STRUCTURAL SYSTEM DEPENDS MAINLY ON ITS CONNECTIONS, WHICH GENERALLY CONSIST OF STEEL ELEMENTS OF SMALL THICKNESS THAT ARE NAILED OR SCREWED TO THE WOOD. WHEN SEISMIC MOVEMENTS OCCUR, THESE JOINTS LOSE STIFFNESS DUE TO THE DAMAGE CAUSED BY THE FLUENCE OF THE CONNECTORS AND CRUSHING IN THE WOOD. THESE DAMAGES ARE USUALLY HIDDEN BY THE FINISHING BOARDS OF WALLS AND SLABS, SO IT IS DIFFICULT TO INSPECT THEM AFTER A SEISMIC EVENT. THE OBJECTIVE OF THE PRESENT WORK IS TO ESTIMATE THE LOSS OF STIFFNESS OF CLT WALLS THROUGH NON-DESTRUCTIVE VIBRATION-BASED TESTS. TWO CLT WALLS OF TWO-STORY HEIGHT (SECTION H 2400MM X 4200MM X 1200MM) ARE CONSTRUCTED, WITH THEIR RESPECTIVE CONNECTORS, AND THEN SUBJECTED TO NON REVERSIBLE CYCLIC HORIZONTAL LOAD TESTS. THE WALLS ARE INSTRUMENTED WITH ACCELEROMETERS, AND MODAL IMPACT TESTS ARE APPLIED AFTER EACH HORIZONTAL LOAD CYCLE, OBTAINING THE VARIATION OF THEIR DYNAMIC PROPERTIES. THE EXPERIMENTAL RESULTS SHOW THAT WHEN THE GLOBAL TANGENT STIFFNESS OF THE WALL REACHES 28% OF THE ORIGINAL VALUE, THE FUNDAMENTAL PERIOD OF VIBRATION INCREASE BY 1.52 TIMES. IN THIS WAY, THE POTENTIAL OF THIS NON DESTRUCTIVE TECHNIQUE FOR SEISMIC INSPECTION AND REHABILITATION OF BUILDINGS WITH CLT PANELS IS OBSERVED.