Experimental Evaluation of Static Cyclic In-Plane Shear Behavior of Unreinforced Masonry Walls Strengthened with NSM FRP Strips

Konthesingha, K. M. C.; Masia, Mark J.; Petersen, Robert B.; Page, Adrian

doi:10.1061/(asce)cc.1943-5614.0000512

Cited by 29 publications

(7 citation statements)

References 14 publications

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“…By amending the New York City building code to require reinforcement of existing structures, these buildings may have an improved ultimate load, displacement capacity, ductility, and energy dissipation in response to earthquake events (Konthesingha, 2015). The most concerning cases the New York City Building Code would need to consider are those related to unreinforced masonry buildings, many of which have historical value and will be costly to retrofit.…”

Section: Revise the Seismic Code?mentioning

confidence: 99%

Re-Assessing the New York City Seismic Design Building Code

Benyaminov

Sadiku

Stueber³

2017

JEE

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This paper addresses the need for reassessment and revision of the New York City Seismic Design Building Code to include reinforcing existing structures that were built before 1995. Although earthquakes in New York City are rare, the combination of its geology and pedology allow for little damping and the lack of adequate reinforcement in existing structures have the potential to amplify the consequences of otherwise small events. The NYC Building Code of 1995 requires new structures to be designed against seismic activity, but does not require the addition of seismic reinforcement for existing buildings. In an effort to fill this gap, a case study of Brooklyn Brownstones is presented, illustrating the concern for unreinforced masonry (URM) buildings and describing the cultural and economic ISSN 2157-6092 2017 www.macrothink.org/jee 153 implications of reassessment. This case study, in combination with a literature review and commentary, supports the need for an updated seismic building code. Reassessment will not only preserve culturally significant structures like the Brooklyn Brownstone, but also provide standards for a more resilient infrastructure that will keep New York City operating through greater magnitude events. Journal of Environment and Ecology

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Section: Revise the Seismic Code?mentioning

confidence: 99%

Re-Assessing the New York City Seismic Design Building Code

Benyaminov

Sadiku

Stueber³

2017

JEE

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“…Figure 3 displays examples of NSM-FRP strengthening orientations for in plane shear applications. The test variables, specimen details and observed failure modes of masonry related in plane shear existing experimental studies in the literature are summarized in Table 4 [33,34,35,36,37]. In plane shear strength of URM walls can be improved using NSM-CRFP strips.…”

Section: Nsm-frp Applications For Masonry Wallsmentioning

confidence: 99%

“…The same researchers [37] also tested fully fixed (zero rotation) support conditioned wall panels with two different dimensional aspect ratio of 0.5 and 1, that were also vertically pre-compressed and then subjected to monotonic or in-plane cyclic lateral displacement. Some of the walls were strengthened using either horizontal, vertical, or a combination of both NSM-CFRP strips.…”

Section: Nsm-frp Applications For Masonry Wallsmentioning

confidence: 99%

Fiber Reinforced Polymer Strengthening of Structures by Near-Surface Mounting Method

Parvin

Shah

2016

Polymers

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This paper provides a critical review of recent studies on strengthening of reinforced concrete and unreinforced masonry (URM) structures by fiber reinforced polymers (FRP) through near-surface mounting (NSM) method. The use of NSM-FRP has been on the rise, mainly due to composite materials' high strength and stiffness, non-corrosive nature and ease of installation. Experimental investigations presented in this review have confirmed the benefits associated with NSM-FRP for flexural and shear strengthening of RC and URM structures. The use of prestressing and anchorage systems to further improve NSM-FRP strain utilization and changes in failure modes has also been presented. Bond behavior of NSM-FRP-concrete or masonry interface, which is a key factor in increasing the load capacity of RC and URM structures has been briefly explored. Presented studies related to the effect of temperature on the bond performance of NSM-FRP strengthened systems with various insulations and adhesive types, show better performance than externally bonded reinforcement (EBR) FRP retrofitting. In summary, the presented literature review provides an insight into the ongoing research on the use of NSM-FRP for strengthening of structural members and the trends for future research in this area.

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“…Both fiber-reinforced polymer sheets and the ductility of a cross-diagonal polyethylene terephthalate fiber-reinforced polymer sheet can improve the in-plane shear strength of brick walls [1]. An experimental study [5] was conducted to assess the URM shear panel with near-surface-mounted (NSM) carbon fiber-reinforced polymer (CFRP) strips, and the results showed an increase in ultimate load (9%), displacement capacity (up to 133%), ductility, and energy dissipation (up to 382%). The seismic performance of masonry building models was improved using a cost-effective material, including polypropylene (PP) band and steel wire mesh (WM) [6].…”

Section: Introductionmentioning

confidence: 99%

Reinforced Effect on Brick Wall Using Timber Wall as a Retrofitting Method

et al. 2022

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The purpose of this study is to utilize timber material to enhance the in-plane shear strength and deformation capacity of a brick wall. The proposed strengthening method is light-weight and easy to assemble and includes a timber frame, plywood panel, M12 threaded rod with chemical epoxy, and the hold-down anchor. To evaluate the effectiveness of the reinforced brick wall, three walls were tested under a cyclic horizontal load and static compression stress: the brick wall (BW wall), the reinforced brick wall with timber (BW-T wall), and the reinforced brick wall with timber and the hold-down anchor (BW-TA wall). The proposed prediction method of the Kamiya and Inayama Murakami models assessed the BW-TA wall. The rocking was caused by the failure of BW and BW-T walls. However, because the BW-T wall failed in the lowest part of the wall, the timber part retained the original shape of the brick wall. When the diagonal on the BW-TA wall failed, the horizontal load at maximum load increased by 22%, and the drift angle calculated from the diagonal measurement increased 4.6 times.

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Experimental Evaluation of Static Cyclic In-Plane Shear Behavior of Unreinforced Masonry Walls Strengthened with NSM FRP Strips

Cited by 29 publications

References 14 publications

Re-Assessing the New York City Seismic Design Building Code

Re-Assessing the New York City Seismic Design Building Code

Fiber Reinforced Polymer Strengthening of Structures by Near-Surface Mounting Method

Reinforced Effect on Brick Wall Using Timber Wall as a Retrofitting Method

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