Shear capacity of slabs and slab strips loaded close to the support

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Eva Lantsoght

Presentation from the ACI Fall Convention 2011

Technologie

Shear Capacity of Slabs and Slab Strips Loaded Close to the Support Eva Lantsoght

Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],S9T6 at failure

Introduction Project description (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Highways in the Netherlands

Introduction Project description (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Concrete bridges

Experiments Test setup Size: 5m x 2,5m x 0,3m Continuous support, Line supports Load: vary a/d and position along width

Shear span to depth ratio Introduction (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],Valley of shear failure (Kani 1964)

Shear span to depth ratio Introduction (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],EN 1992-1-1:2005 Figure 6.4

Shear span to depth ratio Introduction (3) ,[object Object],[object Object],[object Object],[object Object]

Shear span to depth ratio Introduction (4) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Shear span to depth ratio Results ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],26% 2.5 S3/S4 – S5/S6 23% 2.0 BX2 – BX3 41% 1.5 BL2 – BL3 64% 1.0 BM2 – BM3 98% 0.5 BS2 – BS3 Average increase b (m) Specimens

Size of loading plate Introduction (1) AASHTO loading truck Tire contact area: 510mm x 250mm EN 1991-2 load model 1 400mm x 400mm

Size of loading plate Introduction (2) 45 ° load spreading 45 ° load spreading – French practice Influence size of loading plate on shear capacity?

Size of loading plate Previous research ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Size of loading plate Test results (1) ,[object Object],[object Object],[object Object],41.5% 2.5 S1 – S2 25.2% 2.0 BX1 – BX3 0.7% 1.5 BL1 – BL3 0.5% 1.0 BM1 – BM3 10.1% 0.5 BS1 – BS3 Average increase b (m) Specimens

Overall width and Effective width Previous research ,[object Object],[object Object],[object Object],[object Object],[object Object]

Overall width and Effective width Test results (1)

Overall width and Effective width Test results (2) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Overall width and Effective width Test results (3) Comparison cracking pattern BS2T1 and S9T1

Comparison to Code Methods Codes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Comparison to Code Methods Results (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],S4T2 Dominant shear crack

Comparison to Code Methods Results (3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Comparison to Code Methods Recommendation ,[object Object],[object Object],[object Object],[object Object],[object Object]

Conclusions (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conclusions (2) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Contact: Eva Lantsoght [email_address] +31(0)152787449

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Slabs subjected to concentrated loads close to supports, as occurring for truck loads on slab bridges, are less studied than beams in shear or slab-column connections in punching. To predict the shear capacity for this case, the Bond Model for concentric punching shear was studied initially. Modifications to this model resulted in the Modified Bond Model, which takes into account the enhanced capacity from the direct transfer of the load to the support, is able to deal with moment sign changes as occurring near continuous supports, and can take into account the reduction in capacity, resulting from the geometry when the load is placed close to the edge. The model is then compared to the results of experiments on slabs subjected to concentrated loads close to supports. As compared to the Eurocode and the ACI code, the Modified Bond Model leads to a significantly better prediction of the experimental results. The Modified Bond Model is one of the few models available to describe the shear capacity of slabs subjected to concentrated loads close to supports and can be used for design and assessment.

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