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Behaviour of GFRP strengthened masonry wall panels under base shock vibrations

  • Type:Project
  • Pages:65
  • Format:Microsoft Word
(Civil Engineering Project Topics & Materials)
Masonry structures are prone to extensive damage followed by

failure and collapse when subjected to loads resulting from wind, earthquake

and other natural or man-made events. Recent earthquakes and terrorist acts

have clearly demonstrated the need for the development of effective and

affordable strategies for the strengthening of masonry. As a response to these

challenges, fiber reinforced polymer (FRP) composites are found to offer

technically and economically viable solutions. In the context of research

undertaken worldwide, this thesis presents an overview of the studies and

field applications of masonry strengthening with FRP composites as

conducted in the last few decades.

In particular, the thesis covers basic materials and installation

techniques, namely: externally bonded laminates, experimental test programs

dealing with the out-of-plane behaviour of walls with discussion of failure

modes and applications including historical structures. Without providing full

details, an effort has been made to address issues related to design so that

practicing engineers can immediately appreciate the potential of this

technology and understand the key parameters affecting performance and the

areas that need further experimentation. The objective of the research is to

study the failure pattern of simple masonry elements with and without GFRP

wrapping subjected to base shock vibrations for out-of-plane loadings, the

behaviour of GFRP wrapped masonry elements were compared with

conventional masonry elements in terms of first crack load, energy

absorption, velocity of impact, cumulative energy, Peak Base Acceleration

(PBA), and Peak Response Acceleration (PRA).

iv

Further, to critically analyze the effectiveness of different GFRP

layouts subjected to base shock excitation and to observe the response of the

wall by changing different impact actions. Also, to assess the accuracy and

performance of available analytical formulations from masonry standards of

masonry walls and to compare the experimental results with the values

obtained from numerical and analytical study was made to understand the

failure modes. This thesis starts with a brief review of the existing

rehabilitation methods available and explains that the use of FRP is a possible

alternative. Results of material tests performed on the masonry and fiber

materials are then presented.

The overall results show that externally applied FRP greatly

increases the strength and energy absorption capacity of un-reinforced

masonry walls. This thesis reports on finite element models which are

developed to predict the response of masonry walls in the case of out-of-plane

loading. The wall panels made of clay bricks were investigated and the

effectiveness of different types of FRP elements used for strengthening is

analysed. The behaviour of FRP strengthened masonry walls subject to out-
of-plane loading is examined and then both experimental and numerical

results compared and found to be in close agreement.

In this investigation, an un-plastered and plastered masonry panel

of size 1 m x 1 m x 0.15 m was installed on a specially developed shock table

for this occasion and tested. Under the base impact, using pendulum of

varying masses and height of fall, collection of details of time history of

vibration, acceleration, energy absorption, and failure pattern of panels is

possible. The panels were repaired using three different types of GFRP

wrappings, namely, vertical, diagonal and inner diagonal patterns.

v

They were later tested in the same manner and corresponding

quantities were collected. The frequency of unrepaired panel was 10 Hz and

that of repaired panel was 17.5 Hz.

The energy absorption of the plastered wall panel was greater than

that of unplastered one by 2.75 times. In the case of unplastered and

strengthened panel with GFRP, the energy absorption was 65 times higher

than that of un-strengthened and un-plastered panel. In the case of plastered

and strengthened panel, energy absorption was 34.45 times higher than that of

plastered panel without GFRP wrapping.

Among the GFRP strengthened and plastered wall panels, those

provided with diagonal inner wrappings behaved well and sustained a greater

number of impacts and absorbed more energy.

The conclusion drawn from this experimental and numerical

investigation is that panel strengthend with GFRP behaved monolithically by

preserving its integrity, enhancing higher energy absorption and sustaining

more numbers of impacts over virgin panel.
Behaviour of GFRP strengthened masonry wall panels under base shock vibrations

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Details

Type Project
Department Civil Engineering
Project ID CVE0126
Price ₦3,000 ($9)
No of Pages 65 Pages
Format Microsoft Word

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    Details

    Type Project
    Department Civil Engineering
    Project ID CVE0126
    Price ₦3,000 ($9)
    No of Pages 65 Pages
    Format Microsoft Word

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