Dynamic performance of concrete undercut anchors for Nuclear Power Plants

Mahrenholtz, Christoph; Eligehausen, Rolf

doi:10.1016/j.nucengdes.2013.09.038

Cited by 21 publications

(10 citation statements)

References 4 publications

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“…Therefore, restricting the load cycling frequency in anchor prequalification tests to preclude inertial effects, for example, to below 0.5 Hz, produces more consistent displacement results. A similar conclusion and recommendation for restricting load and crack cycling frequencies was proposed by Mahrenholtz [28]. In summary, dynamic effects may conservatively be excluded from anchor qualification testing.…”

Section: Requirements For a Comprehensive Seismic Anchorage Qualifsupporting

confidence: 63%

Development and validation of European guidelines for seismic qualification of post-installed anchors

Mahrenholtz

Wood

Eligehausen

et al. 2017

Engineering Structures

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This paper presents the technical background for the seismic qualification procedures for post-installed anchors in the European Technical Approval Guideline (ETAG 001) seismic annex issued in 2013. We discuss requirements for a comprehensive guideline and reference supporting documentation. Numerical studies to generate new simulated seismic protocols for anchors are summarized with focus on their application to Europe. To reduce the time and cost of anchor product qualification testing while fulfilling the requirement of European building codes to assess two performance categories, we combine the results of our numerical studies to generate novel testing protocols that allow for the assessment of anchor behavior at multiple levels in a unified protocol. Validation tests demonstrate that the unified protocol results in anchor performance comparable with that achieved in multiple, single-performance-level tests.

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Section: Requirements For a Comprehensive Seismic Anchorage Qualifsupporting

confidence: 63%

Development and validation of European guidelines for seismic qualification of post-installed anchors

Mahrenholtz

Wood

Eligehausen

et al. 2017

Engineering Structures

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“…The cyclic tests were run load-controlled at quasi-static frequencies of about 0.2 Hz. It has been shown that this loading rate is appropriate for simulated seismic anchor tests 13,31,32 . For cyclic tension tests, the servo control program consisted of sinusoidal load cycles in which the minimum load level was 0.1 kN (22 lbf) to avoid control problems due to slackness between anchor nut and slab.…”

Section: Experimental Investigationmentioning

confidence: 99%

Behavior of Post-Installed Anchors Tested by Stepwise Increasing Cyclic Load Protocols

Mahrenholtz¹,

Eligehausen²,

Hutchinson³

et al. 2016

ACI Structural Journal

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Cyclic loads are a characteristic feature of actions acting on structures and anchorages during earthquakes. For this reason, seismic qualification of post-installed concrete anchors according to the internationally recognized American Concrete Institute (ACI) standard ACI 355 is based on cyclic load tests. The protocols for these tests, however, have limited scientific basis. Therefore, in the present paper newly-developed test protocols with stepwise-increasing load amplitudes are utilized to more realistically evaluate anchor seismic performance. The study focuses on the load-displacement behavior of common anchor types installed in cracked concrete and subjected to both cyclic tension and cyclic shear actions. The results confirmed robust behavior for anchors loaded in cyclic tension even in the presence of crack widths in the anchorage material larger than currently required by ACI 355. In addition, the critical influence of low cycle fatigue on the performance of anchors loaded in cyclic shear is demonstrated.

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“…A significant number of parameters, including concrete cone failure, concrete splitting, anchor rod pullout, and anchor bolt failure, were investigated. Several such studies were reviewed in the literature. Other parameters, which were also considered in this paper, include the behavior of fiber‐reinforced polymer (FRP) strips used to strengthen some of the tested specimens.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the influence of joint connection details between existing buildings and added new frames on failure mode of retrofitted slabs for the vertical expansion of old buildings: Part II

Kim

Hong

Yun

2017

Structural Design Tall Build

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Summary Dismantling entire existing buildings can be circumvented by adding additional frames to provide more residence, thus avoiding the need to reconstruct buildings. The alternatives are to construct new frames on old apartment buildings in order to avoid entirely dismantling existing buildings. The conventional wall frames for super structures added onto existing buildings are replaced by frames consisting of composite beams and steel columns to minimize beam depth and weight of the load from the added frames. This paper studied joint connection types for the rehabilitation of old buildings to withstand lateral loads. Details of the joints between newly added steel columns and existing slabs are presented in this paper. The structural behaviors of anchored joints between the new 3‐story composite frames and an existing 15‐floor building were significantly investigated through extensive experiments. Complex failure modes were identified based on the test of the wall foundation types and the anchor types connecting the base plates to existing slabs. The authors previously reported that the flexural load‐bearing capacity of slabs was the dominant load‐resisting capacity. The column–slab joint connections introduced with experimental demonstrations in this study are expected to contribute to enhancing the lateral capacity of the extended buildings.

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Dynamic performance of concrete undercut anchors for Nuclear Power Plants

Cited by 21 publications

References 4 publications

Development and validation of European guidelines for seismic qualification of post-installed anchors

Development and validation of European guidelines for seismic qualification of post-installed anchors

Behavior of Post-Installed Anchors Tested by Stepwise Increasing Cyclic Load Protocols

Experimental investigation of the influence of joint connection details between existing buildings and added new frames on failure mode of retrofitted slabs for the vertical expansion of old buildings: Part II

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