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        Horizontal Pullout Resistance of a Group of Two Vertical Anchors in Sand

        Jagdish Prasad Sahoo,Jyant Kumar 대한토목학회 2013 KSCE Journal of Civil Engineering Vol.17 No.7

        The horizontal pullout capacity of a group of two vertical strip anchors placed along the same vertical plane in sand has been determined by using the upper bound finite elements limit analysis. The variation of the efficiency factor (ξγ) with changes in clear spacing (S) between the anchors has been established to evaluate the total group failure load for different values of (i) embedment ratio (H/B), (ii) soil internal friction angle (φ), and (iii) anchor-soil interface friction angle (δ). The total group failure load, for a given H/B, becomes always maximum corresponding to a certain optimal spacing (Sopt). The value of Sopt/B was found to lie in a range of 0.5-1.4. The maximum magnitude of ξγ increases generally with increases in H/B, φ and δ.

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        Seismic Performance of Footings on Stone Columns Treated Dry Sand Beds

        Priti Maheshwari,Nitish Kumar Yadav,Jagdish Prasad Sahoo 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.11

        An extensive experimental study has been carried out to study the seismic performance of footings on stone columns treated dry sand beds. Physical models have been prepared in a laminar shear box of size 1 m3 on the shaking table which has a single degree of freedom motion for representing horizontal shaking action under seismic vibrations. Effect of the configuration of stone columns, aspect ratio of footing, relative density of sand bed, frequency and peak ground acceleration (PGA) of cyclic input motion on vertical settlement of footing has been studied. Optimum length of stone columns has been found to lie between 13 − 16 times the diameter. Direction of shaking perpendicular to length of footing has been found to be more critical. Effect of aspect ratio has been found to be more pronounced at larger PGA. Influence of the frequency on response of footings has also been quantified.

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