Rothoblaas - Soundproofing Solutions Pagina 84
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CORRECT DESIGN OF RESILIENT PROFILES CORRECT DESIGN OF STRUCTURAL JOINTS If resilient profiles are not included in the design, the propagation of vibrations at the structural level is not interrupted and the contribution of flanking sound transmission can be significant, both for airborne sound and the impact sound. The profile, placed only above the floor, interrupts part of the propagation of vibrations generated by airborne noise. The absence of the lower profile causes part of the airborne noise and all impact noise to propagate indirectly. The profile placed only below the ceiling interrupts the propagation of vibrations generated by impact noise. As we can see, this configuration lacks the profile that interrupts the propagation of vibrations generated by airborne noise. Due to the presence of the resilient profile both above and below the floor, all lateral transmission paths were interrupted and the propagation of vibrations through the structure was minimised. DESIGNING THE CORRECT PROFILE ACCORDING TO THE LOAD Resilient profiles must be correctly loaded in order to isolate the low to medium frequencies of structurally transmitted vibrations: guidance on how to proceed with the evaluation of the product are given below. It is advisable to add the permanent load value at 50% of the characteristic value of the accidental load. Qlinear = qgk + 0,5 qvk Q linear = DL + 0,5 LL It is necessary to focus on the operating conditions and not the ultimate limit state conditions. This is because the goal is to insulate the building from noise during normal operating conditions and not during design level events. 86 | CORRECT DESIGN OF RESILIENT PROFILES | STRUCTURAL NOISE
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