In suspended ceilings, the most common joints are used to connect cross tees to main tees or cross tees to cross tees. Finally, wall mouldings are located at the perimeter, in correspondence to the grid height, where the runners can be simply supported or rigidly connected to the mouldings. Hanger wires are installed at a specific spacing on the main runners, with the aim of connecting the grid to the soffit. Cross runners are installed perpendicularly to the main runners and metal, gypsum or other tiles lay on the bottom part of the runners. 1 there is a scheme of a typical T-Grid suspended ceiling: a metal grid represents the main structure, that is realised with main and cross runners whose section has T-shape. In this work, T-Grid suspended ceilings are studied, since this typology is widespread worldwide and performed poorly in many past earthquakes. 2017) and the behaviour of their components is not considered influencing the overall performance. In fact, dry-wall suspended ceilings showed high stiffness in past experimental campaigns (Magliulo et al. They can be firstly divided between continuous dry-wall ceiling systems and T-Grid suspended ceilings. Suspended ceilings are complex building systems that can be divided in different categories according to the configuration of the metal grid and the components that are installed. The results here presented allows to accurately characterise the behaviour of inner joints and finally enhancing the global seismic behaviour of suspended ceilings. The aim of this work is to evaluate the performance of different types of inner joints and investigate the influence of shape and dimensions of tees to the performance of the connection. Moreover, numerical models of the joints were developed and calibrated on the experimental results. Specimens were subjected to monotonic and cyclic quasi-static tests, using a similar setup to the ones used in Literature to allow a comparison of the performances obtained. Moreover, an extensive experimental campaign has been conducted on a type of the so-called “standard” and “seismic” joints, produced in Europe and installed in different typologies of runners. In this work a preliminary numerical study on a full-scale suspended ceiling model has been performed to evaluate the main actions on suspended ceiling joints. Moreover, the available experimental results are characterized by elasto-fragile behaviour and concern devices which differ in size and type from the mechanical connections commonly manufactured in Europe. While perimeter joints have been assessed in many experimental campaigns, there are limited data regarding experimental and numerical characterisation of inner joints. As demonstrated by the failures reported after seismic events worldwide, ceiling joints are often subjected to damage that ultimately leads to collapse of the ceiling system. Ceiling systems are among the most common non-structural components, since they are widely installed in public buildings, retails and offices. During an earthquake, damages of non-structural components can prevent the safe occupancy of buildings and contribute largely to the global economic losses.
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