A Procedure for the Detailing Design of Simply Supported R.C. Bridge Decks Subjected to in-Plane Actions

Palmisano, Fabrizio; Elia, Angelo

doi:10.7712/120115.3636.1541

Cited by 1 publication

(1 citation statement)

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“…So far the LPM has been used for a wide range of applications: RC structures [8,16], masonry structures [17][18][19][20], seismo-resistant structures [21], progressive collapse [22], assessment of existing constructions [23][24][25].…”

Section: The Transversal Shear Behaviourmentioning

confidence: 99%

A preliminary study on shear capacity of historical reinforced concrete beams

Palmisano¹

2017

Int. J. HA

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In European cities there are many reinforced concrete (RC) constructions belonging to the early 20th century and, in most cases, these pieces of work so rich in historical, architectural and cultural significance urgently require maintenance and restoration.Reinforced concrete works, from the origins until the release of the first technical standards, were built by applying patented systems (e.g. Monnier's, Hennebique's) that were often the result of individual intuitions more than scientific and technical knowledge. This is one of the reasons that many of the structures built in those years, and still surviving, could not be considered reliable with regard to the structural safety, as it is presently intended.In this scenario, the evaluation of RC beam shear capacity becomes crucial. In this article, analysing the tests carried out in Stuttgart in the early 20th century, a preliminary study on the shear capacity assessment of historical RC beams is presented. The aim is to verify the applicability to these kinds of beams of the relations given for new constructions in the present codes. Moreover a novel formulation for the transversal shear capacity for historical RC beams with U-shaped plates is proposed. Keywords: Load Path Method, reinforced concrete, shear capacity, Strut-and-Tie Model INTRODUCTIONThe main task to be faced in the restoration of the early RC constructions is the assessment of their actual structural capacity, in order to provide the proper guidelines for retrofitting, rehabilitation and conservation.It is not so straightforward to apply to ancient concrete structures the same methods of analysis that are used for the design of new constructions, and this is particularly true with regard to shear capacity. In fact, models and formulations used in the standard design practice are mainly based on the experimental observation of the behaviour of real-scale structural elements that are different from those of the early RC constructions. The constructive technique and the structural details concerning the shear reinforcement have changed much in the last century, much more than those regarding longitudinal reinforcement.Present methods to evaluate shear capacity seem to be not applicable to old RC structures mainly due to the following reasons:

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