Tests on composite slabs and evaluation of relevant Eurocode 4 provisions

Abstract

Abstract. The paper addresses some key issues related to the design of composite slabs with cold-formed profiled steel sheets. An experimental programme is first presented, involving six composite slab specimens tested with a view to evaluating Eurocode 4 (EC4) provisions on testing of composite slabs. In four specimens, the EC4-prescribed 5000 load cycles were applied using different load ranges resulting from alternative interpretations of the reference load W t . Although the rationale of the application of cyclic loading is to induce loss of chemical bond between the concrete plate and the steel sheet, no such loss was noted in the tests for either interpretation of the range of load cycles. Using the recorded response of the specimens the values of factors m and k (related to interface shear transfer in the composite slab) were determined for the specific steel sheet used in the tests, on the basis of three alternative interpretations of the related EC4 provisions. The test results confirmed the need for a more unambiguous description of the m-k test and its interpretation in a future edition of the Code, as well as for an increase in the load amplitude range to be used in the cyclic loading tests, to make sure that the intended loss of bond between the concrete slab and the steel sheet is actually reached. The study also included the development of a special-purpose software that facilitates design of composite slabs; a parametric investigation of the importance of m-k values in slab design is presented in the last part of the paper.2

An experimentally validated study for open rib profiles steel‐concrete composite slabs behavior in partial connection

“…This failure is rarely critical. al (9) reported, where the lower limit of cyclic loads obtained from monotonic test, is lower than the slab's own weight. Although slip is the criterion for classifying the slabs failure as shear-bond mode, slip resistance is not the only factor determining the strength.…”

“…Chemical debonding after cyclic test may not be fully achieved, as Salonikios et. al (9) reported, where the lower limit of cyclic loads obtained from monotonic test, is lower than the slab's own weight. This problem is more common in long slabs.…”

Experiments and failure analysis of SHCC and reinforced concrete composite slabs

“…On the other hand, conventional reinforced concrete slab systems are commonly adopted in the design and construction of building structures [13]. However the thickness and the amount of reinforcing bars in such slabs could be reduced if they are made composite by applying profiled steel sheets or high performance composite materials [14][15][16]. Several types of steel sheet composite slabs were developed and applied in building structures offering advantages in both the construction process and the structural performance [14][15][16].…”

“…However the thickness and the amount of reinforcing bars in such slabs could be reduced if they are made composite by applying profiled steel sheets or high performance composite materials [14][15][16]. Several types of steel sheet composite slabs were developed and applied in building structures offering advantages in both the construction process and the structural performance [14][15][16]. High performance materials such as Fibre-reinforced polymer (FRP) composite sheets or bars could also be used to strengthen reinforced concrete slabs, beams, and columns by enhancing their flexural capacity and controlling cracking [17][18][19][20].…”