Precast segments under TBM hydraulic jacks: Experimental investigation on the local splitting behavior

Tiberti, Giuseppe; Conforti, Antonio; Plizzari, Giovanni

doi:10.1016/j.tust.2015.08.013

Cited by 44 publications

(32 citation statements)

References 16 publications

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“…While a PL configuration characterised by a concentrated load on a square area with side, a, ( Figure 3b) leads to a three dimensional distribution of stresses. However, Square section is generally adopted for both LL and PL configuration (Schnütgen, 2003, Tiberti, et al, 2015and Breitenbücher, et al, 2014.…”

Section: Figure 1 Definition Of a And D Dimensions For Tunnel Boringmentioning

confidence: 99%

“…Study has shown that in a point load test the cracking for splitting occurs always at a value of the compressive stress under the loading area greater than the cylindrical compressive concrete strength due to confinement effect, (Conforti et al, 2016). In fibre reinforced element under a high concentrated load, the synthetic fibre provides a stable development of splitting cracks and increases load bearing capacity by providing crack-bridging forces against the applied load, (Schnütgen, 2003 andTiberti, et al, 2015). Guyon (1953Guyon ( ,1972 investigated the tensile stresses responsible for cracking problems in early post-tensioning of precast concrete applications in Europe.…”

Section: Figure 3(a and B): Load Configurations For Studying Local Spmentioning

confidence: 99%

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Development of Improved Models for Estimation of Bursting Stresses in Elements under High-Concentrated Load

Boye¹,

Abbey

Ngambi

et al. 2019

Lat. Am. j. solids struct.

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In precast concrete segmental tunnels, radial and circumferential joints are often the most highly stressed parts and it is therefore important to use appropriate equations to accurately analysed these joints during design and provide adequate structural capacity to avoid failure. Different design codes have put forward equations for the estimation of bursting forces due to concentrated load on precast end blocks. The equations were specifically developed for pre-stressed concrete anchors and not specifically for precast concrete segmental tunnels. The design equations often account for the effects of load eccentricity in estimating bursting force but not the peak stress. This paper assesses the accuracy of published equations for bursting force and peak stress by conducting a high-resolution two-dimensional (2D) finite element (FE) based parametric studies. It was found that the effects of load eccentricity are significant for highly concentrated loads (load width ratios less than 0.3) and that they increase the peak bursting stresses significantly. Regression analysis is used to develop equations for estimating the peak bursting stress and bursting force due to load eccentricity for the design of precast concrete tunnel segments. These equations are more accurate as compared to pre-existing equations and important for practising engineers and designers.

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Section: Figure 1 Definition Of a And D Dimensions For Tunnel Boringmentioning

confidence: 99%

Section: Figure 3(a and B): Load Configurations For Studying Local Spmentioning

confidence: 99%

Development of Improved Models for Estimation of Bursting Stresses in Elements under High-Concentrated Load

Boye¹,

Abbey

Ngambi

et al. 2019

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

show abstract

“…For this reason, the check for this phase has to be performed with numerical models and/or full-scale experimental tests in order to simulate, as closely as possible, the actual actions on the segment and to point out the concrete cracking phenomena and predict the crack opening. This aspect is very important because in this kind of structure the crack opening limit has to be complied with [10,[24][25]. aim is to show the practical procedure for defining the M-N envelopes for the phases cited above.…”

Section: Serviceability Limit State Checkmentioning

confidence: 99%

Design procedure for precast fibre‐reinforced concrete segments in tunnel lining construction

Carlo

Meda

Rinaldi

2016

Structural Concrete

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A procedure for the design of precast tunnel segments for mechanical excavated tunnel lining in fiber reinforced concrete, without any traditional steel reinforcement, is presented herein. Both assisted by test procedure for particular loading situation is also proposed. Finally, a case study related to a precast steel fiber reinforced concrete segment is analysed in order to clarify the procedure and to show practically how to define the actions and to evaluate the interaction envelopes.

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“…Many studies confirm that fibres are oriented in concrete due to and different factors [1,2,3], being the casting and compaction processes [4], the geometry and type of the fibres and the wall effect some of the more relevant; very fluid mixtures more susceptible and in self-compacting FRC it was proved the existence of significant flow effect [5,6,7,8,9]. The influence of these factors increases if thin elements are considered [10,11].…”

Section: Introductionmentioning

confidence: 98%

Vibrated and self-compacting fibre reinforced concrete: experimental investigation on the fibre orientation

Conforti

Plizzari

Zerbino

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In addition to the fibre type and content, the residual properties of fibre reinforced concrete are influenced by fibre orientation. Consequently, the performance fibre reinforced concrete can be affected by its fresh properties (workability, flowing capacity) and by casting and compaction processes adopted. This paper focuses on the study of the orientation of steel or macro-synthetic fibres in two materials characterized by very different fresh properties: vibrated and self-compacting concrete. Four rectangular slabs 1800 mm long, 925 mm wide and 100 mm high were produced changing concrete and fibre type. From each slab, eighteen small prisms (550 mm long) were firstly cut either orthogonal or parallel to casting direction and, secondly, notched and tested in bending according to EN 14651. Experimental results showed that the toughness properties of a thin slab significantly varies both in vibrated and self-compacting concrete, even if in case of self-compacting concrete this variation resulted higher. Steel fibres led to greater variability of results compared to polymer one, underlining a different fibre orientation. A discussion on the relative residual capacity measured on the prisms sawn from the slabs and the parameters obtained from standard specimens is performed.

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Precast segments under TBM hydraulic jacks: Experimental investigation on the local splitting behavior

Cited by 44 publications

References 16 publications

Development of Improved Models for Estimation of Bursting Stresses in Elements under High-Concentrated Load

Development of Improved Models for Estimation of Bursting Stresses in Elements under High-Concentrated Load

Design procedure for precast fibre‐reinforced concrete segments in tunnel lining construction

Vibrated and self-compacting fibre reinforced concrete: experimental investigation on the fibre orientation

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