Filtreler
Response and stability of underground structures in rock mass during earthquakes

Aydan Ö. | Ohta Y. | Geniş M. | Tokashiki N. | Ohkubo K.

Article | 2010 | Rock Mechanics and Rock Engineering43 ( 6 ) , pp.857 - 875

Underground structures are well known to be earthquake resistant. However, the recent earthquakes showed that underground structures are also vulnerable to seismic damage. There may be several reasons such as high ground motions and permanent ground movements. This study attempts to describe various forms of damage to underground structures such as tunnels, caverns, natural caves and abandoned mines during major earthquakes. Results of various model tests on shaking table are also presented to show the effect of ground shaking on the response and collapse of underground structures in continuum and discontinuum. Furthermore, some emp . . .irical equations are proposed to assess the damage to underground structures, which may be useful for quick assessments of possible damage. © 2010 Springer-Verlag Daha fazlası Daha az

INVESTIGATION OF FRP EFFECTS ON DAMAGED ARCHES IN HISTORICAL MASONRY STRUCTURES

Firat, Fatih Kursat | Eren, Ahmet

Article | 2015 | JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY30 ( 4 ) , pp.659 - 670

The present paper deals with experimental behavior of deformed brick masonry arches strengthened with the fiber reinforced polymer (FRP). Seven arches were fabricated using commercial clay brick and low strength lime-based mortar, trying to mimic historical structures. After reaching sufficient strength (28 day strength), one arch called reference specimen is tested under the ultimate load and other arches are given damage to a certain extent. Then six different strengthening arrangements, including different dimensions of FRP strips, spike anchors and joint grouting are implemented on six arches damaged. The numerical modeling of d . . .amaged masonry arches strengthened with FRP is performed using a commercially available structural analysis program and the numerical results are compared with the experimental ones. The experimental results show that the capacity of damaged masonry arch strengthened increases at least 58% in comparison with unstrengthened masonry arches and strengthening of joints with epoxy resin is an effective alternative to increase the damaged masonry arch capacity Daha fazlası Daha az

Investigation of frp effects on damaged arches in historical masonry structures [Tarihi yigma yapilardaki hasarli kemerler üzerinde frp etkisinin incelenmesi]

Firat F.K. | Eren A.

Article | 2015 | Journal of the Faculty of Engineering and Architecture of Gazi University30 ( 4 ) , pp.659 - 670

The present paper deals with experimental behavior of deformed brick masonry arches strengthened with the fiber reinforced polymer (FRP). Seven arches were fabricated using commercial clay brick and low strength lime-based mortar, trying to mimic historical structures. After reaching sufficient strength (28 day strength), one arch called reference specimen is tested under the ultimate load and other arches are given damage to a certain extent. Then six different strengthening arrangements, including different dimensions of FRP strips, spike anchors and joint grouting are implemented on six arches damaged. The numerical modeling of d . . .amaged masonry arches strengthened with FRP is performed using a commercially available structural analysis program and the numerical results are compared with the experimental ones. The experimental results show that the capacity of damaged masonry arch strengthened increases at least 58% in comparison with unstrengthened masonry arches and strengthening of joints with epoxy resin is an effective alternative to increase the damaged masonry arch capacity Daha fazlası Daha az

Damage detection in fibre reinforced ceramic and metal matrix composites by acoustic emission

Kaya F.

Conference Object | 2010 | Key Engineering Materials434-435 , pp.57 - 60

In this work damage micro-mechanisms of two different types of fibre reinforced composites are investigated by acoustic emission, AE. Ceramic based oxide fibre reinforced mullite matrix composite and metallic based SiC fibre reinforced titanium matrix composites exhibit different fracture mechanisms during loading and AE technique could pinpoint these damage mechanisms based on the AE responses detected simultaneously. The results show that in a ceramic matrix composite, the identification of fibre fracture and matrix cracking requires careful analysis of the AE data as both fibres and matrix break in brittle manner. Whereas the sep . . .aration of fibre fracture from the ductile tearing of matrix ligaments could be easier in metallic based composites, such as titanium matrix composites. © (2010) Trans Tech Publications Daha fazlası Daha az

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