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Load capacity of anchorage to concrete at nuclear facilities: Numerical studies of headed studs and expansion anchors
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The aim of this thesis was to study the load bearing capacity of anchor plates, used

for anchorage to concrete located at nuclear facilities. Two different type of anchor

plates were examined, which together constitute the majority of the anchor plates

used at Forsmark nuclear facility in Sweden. The first is a cast-in-place anchor plate

with headed studs and the second is a post-installed anchor plate which uses sleevetype

expansion anchors. Hence, anchors with both a mechanical or a frictional

interlock to the concrete were examined. The main analysis tool was the finite

element method, through the use of the two commercially available software packages

ABAQUS and ADINA and their non-linear material models for concrete and steel.

As a first step, the numerical methods were verified against experimental results

from the literature. However, these only concern single anchors. The results from

the verifications were then used to build the finite element models of the anchor

plates. These were then subjected to different load combinations with the purpose

to find the ultimate load capacity. Failure loads from the finite element analyses

were then compared to the corresponding loads calculated according to the new

European technical specification SIS-CEN/TS 1992-4 (2009).

Most of the failure loads from the numerical analyses were higher than the loads

obtained from the technical specification, although in some cases the numerical results

were lower than the technical specification value. However, many conservative

assumptions regarding the finite element models were made, hence there might still

be an overcapacity present. All analyses that underestimate the failure load were

limited to large and slender anchor plates, which exhibit an extensive bending of the

steel plate. The bending of the steel plate induce shear forces on the anchors, which

leads to a lower tensile capacity. In design codes, which assume rigid steel plates,

this phenomenon is neglected. The failure loads from all different load combinations

analysed were then used to develop failure envelopes as a demonstration of a useful

technique, which can be utilised in the design process of complex load cases.

Place, publisher, year, edition, pages
2011. , 159 p.
Trita-BKN-Examensarbete, ISSN 1103-4297 ; 327
Keyword [en]
anchor plates, headed studs, expansion anchors, concrete, finite element analysis, non-linear material models, failure envelopes
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-40820OAI: diva2:459256
Subject / course
Concrete Structures
Educational program
Master of Science in Engineering - Urban Management
Available from: 2011-11-25 Created: 2011-09-21 Last updated: 2011-11-25Bibliographically approved

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