1,721,068 research outputs found
Simplified approach for the long-term behaviour of timber-concrete composite beams according to the Eurocode 5 provisions
No full textSimplified approach for the long-term behaviour of timber-concrete composite beams according to the Eurocode 5 provisions
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Caratterizzazione meccanica di elementi murari storici per lo studio del palazzo di Diocleziano a Spalato
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Cyclic behavior of cross-laminated timber (CLT) wall systems: Experimental tests and analytical prediction models
No full textAn experimental program was performed at IVALSA Trees and Timber Institute on single and coupled cross-laminated (CLT) wall panels with different anchoring systems and different types of joints between adjacent panels. The mechanical properties of CLT walls were assessed and are critically discussed in the paper. The connector layout and the design of the screwed vertical joints were found to markedly affect the overall behavior of the structural system. The in-plane deformations of CLT panels were almost negligible, whereas concentration
of forces and deformations mainly occurred in the connections. Advanced analytical models for nonlinear pushover analysis of CLT wall systems were developed and verified against test results. The models take into account all stiffness and strength components of connectors, as
well as the bending and shear deformation of the panels. A parametric study of CLT wall systems with different aspect ratios and wall segmentation was performed, showing that segmentation of CLT walls decreases their stiffness and strength but significantly improves their deformation capacity
Long-term and collapse tests on a timber-concrete composite beam with glued-in connection
No full textThe paper reports the results of a comprehensive
experimental test performed on a 6m span timber-concrete composite beam with glued rebar connection. The beam had first been subjected to sustained load in unsheltered outdoor conditions for 5 years. Eventually a ramp loading test up to failure was performed. The long-term test showed an increase in deflection mainly during the first two years, while the
slip rose during the whole testing period. Thermohygrometric variations of environment caused an important fluctuation of all quantities on both yearly and
daily scale. By comparing experimental and analytical
results, it is highlighted that composite beams in outdoor conditions should be assigned to the 3rd service
class according to the Eurocode 5 (EC5). Analytical
predictions based on approximate formulae suggested
by such regulation are found to be not conservative
for the long-term behaviour and fairly accurate for the
collapse behaviour. Since the simplified formulae proposed
by the latest versions of the EC5-Parts 1.1 and 2 largely underestimate the actual connection stiffness and strength, it is recommended that realistic values of
these properties, such as those obtained through pushout
tests, be used when designing timber-concrete composite
beams
"Strength and deformation characteristics of typical X-lam connections"
No full textThis paper presents some of the results of an extensive experimental programme on typical X-Lam connections, conducted at CNR-IVALSA research institute. The goal of this research is to provide a better understanding of the seismic performance of connections in cross-laminated timber buildings subjected to seismic
actions. In-plane monotonic and cyclic shear tests were performed on mechanical screwed connections between
adjacent parallel wall-wall and floor-floor X-Lam panels. In addition, monotonic and cyclic tests were carried out on orthogonally connected panels (wall-wall and wall-floor) subjected to shear and withdrawal load. Mechanical properties in terms of strength, stiffness, energy dissipation, ductility ratio and impairment of strength were evaluated. The
overstrength factor, which is of great importance in capacity-based design, was also evaluated for the different types of connection tested
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