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Shear in reinforced concrete slabs—Experimental investigations in the effective shear width of one‐way slabs under concentrated loads and with different degrees of rotational restraint
Author(s) -
Reissen Karin,
Classen Martin,
Hegger Josef
Publication year - 2018
Publication title -
structural concrete
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.912
H-Index - 34
eISSN - 1751-7648
pISSN - 1464-4177
DOI - 10.1002/suco.201700067
Subject(s) - slab , shear (geology) , strips , structural engineering , materials science , reinforced concrete , transverse plane , eurocode , geotechnical engineering , composite material , geology , engineering
The shear design of reinforced concrete ( RC ) slabs under concentrated loads calls for the definition of an effective width, which can be used to assess the slab's shear capacity. However, currently the shear strength and effective shear width of one‐way RC slabs is only poorly investigated. Therefore, this paper presents the results of 34 shear tests on RC slabs and slab strips without shear reinforcement. To analyze the effective shear width, 0.5 m wide slab strips and slabs with a width of up to 3.5 m were tested under concentrated loads with different shear‐span‐to‐depth ratios (varying between 1.4 and 5.4). While the slab strips were activated over their full width (beam action), the shear capacity of the wide slabs was significantly influenced by their effective shear width. To also clarify the impact of the structural system and the support conditions, the slabs were clamped at one end with different degrees of rotational restraint. Beginning with simply supported, single‐span slabs, the rotational restraint was stepwise increased to 100% representing a fully clamped support. Further investigated parameters were the transverse reinforcement ratio and the arrangement of multiple loads. The resulting shear capacities of all tests are compared with code provisions of Eurocode 2. The results illustrate remarkable differences in the shear behavior of wide slabs and slab strips with predominant beam action. Besides the influence of the effective shear width, this paper analyzes the direct load transfer to supports via strut mechanisms (arching action).