Patricio Gómez-Salas Ramírez
Wooden structures, like all lightweight constructions, do not have a high acoustic performance at low frequencies. This is particularly true concerning impact sounds and the transmission of structural vibration through the structure. The presentation explores some typical structural connections details and acoustic solutions selected by designers of timber buildings in Europe and overseas, along with the concept of “desolidarization,” with specific, resilient profiles.
As a fastening system, self-tapping screws have several applications in lightweight (e.g. light-frame) and massive (e.g. cross-laminated) timber structures, including panel-to-panel connections between adjacent walls, or between floor panels and underlying walls, and step joints among platform beams and underlying walls. The main range of applications with self-tapping screws is discussed. Specifically, cross-laminated timber (CLT) structures are made with prefabricated panels, connected by using metal devices such as hold-downs and angle brackets. The hold-downs, generally positioned at the end of the wall panel, work mostly in tension to avoid rocking of the wall, while the angle brackets, uniformly spaced along the wall panel, work mostly in shear, to avoid slippage of the wall. Some typical construction details are shown in this presentation. Thinking and contributing to the evolution of wooden buildings means identifying innovative technological solutions, developing specific connections for CLT structures, and adopting new, simple and quick construction systems. X-RAD and Spider are two new developments for CLT and post-panel timber structures, designed to simplify on-site operations, ensuring precision and quick assembly, while providing excellent static performances. These are also discussed.