Analysis of factors affecting strain distribution in geosynthetics

Download
2006-01-01
Kutay, ME
Güler, Murat
Aydilek, AH
Localized strains due to production defects, seams, and punctured zones significantly affect mechanical performance of geosynthetic materials. Accurate determination of localized strains becomes particularly important for quality control/quality assurance evaluation of these materials and may play a critical role in design problems. A battery of tensile tests was conducted on 12 different geosynthetics to assess the effects of seam type, puncture, and clamping techniques on strain distributions. Digital images of the geosynthetic specimens were captured during testing, and the analyses of time-lapsed images were performed using two optical flow techniques to define strain distributions within specimens as well as in the vicinity of grip locations and seam zones. The results indicated that the optical flow techniques used in this study can successfully define the distribution of strains in a geosynthetic test specimen during tensile testing. The magnitude of lateral strains was small in polypropylene wovens and geogrids, whereas it was significant in polyester wovens and nonwovens. Large strains developed in the vicinity of seams regardless of the clamping technique used. The strains at the seam zones measured with hydraulic grips were significantly higher than those measured with roller grips. Sewn geosynthetics generally experienced lower lateral strain-to-axial strain ratios. The average axial strain appears to be insensitive to puncture regardless of the type of geosynthetics considered or the clamping technique used.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING

Suggestions

Cyclic Large Strain and Induced Pore Pressure Models for Saturated Clean Sands
Çetin, Kemal Önder (American Society of Civil Engineers (ASCE), 2012-03-01)
Semiempirical probabilistic models are described to assess cyclic large strain and induced excess pore-water pressure responses of fully saturated clean sands. For this purpose, available cyclic simple shear and triaxial tests were compiled and studied. The resulting r(u) versus gamma, and gamma versus N databases are composed of 101 and 84 cyclic test data, respectively. Key parameters of the proposed r(u) and gamma models are defined as critical shear strain, relative density, effective confining stress, ...
Use of Class C fly ashes for the stabilization of an expansive soil
Çokça, Erdal (American Society of Civil Engineers (ASCE), 2001-07-01)
Excessive heave associated with swelling of expansive soils can cause considerable distress to lightweight civil engineering structures. Several methods have been suggested to control this problem. The most commonly used method is addition of stabilizing agents, such as lime or cement to the expansive soil. In this study, high-calcium and low-calcium class C fly ashes from the Soma and Tuncbilek thermal power plants, respectively, in Turkey, were used for stabilization of an expansive soil. An evaluation of...
Development of Fragility Curves for Single-Column RC Italian Bridges Using Nonlinear Static Analysis
Perdomo, Camilo; Monteiro, Ricardo; Sucuoğlu, Haluk (Informa UK Limited, 2020-05-07)
The main objective of this study is to assess the accuracy and suitability of Nonlinear Static Procedures (NSPs) in the development of analytical damage fragility curves for seismic risk assessment of large portfolios of Reinforced Concrete (RC) bridges. Seven NSP approaches, from widely used single-mode conventional pushover-based approaches to the more rigorous multi-mode conventional or adaptive pushover-based procedures are implemented. By systematically comparing fragility curve estimations in terms of...
Evaluation of Seismic Response Factors for Eccentrically Braced Frames Using FEMA P695 Methodology
KUŞYILMAZ, Ahmet; Topkaya, Cem (SAGE Publications, 2016-02-01)
This paper reports details of a numerical study undertaken to evaluate seismic response factors for steel eccentrically braced frames (EBFs) using the FEMA P695 methodology. Six archetypes were designed by making use of the current U.S. specifications, and their behavior was assessed by making use of nonsimulated collapse models. Results indicate that the current values of response factors result in designs with higher collapse probabilities than expected. Two modifications were developed to bring the colla...
Analysis of the heterogeneity scale effects on pump and treat aquifer remediation design
Güngör Demirci, Gamze; Aksoy, Ayşegül; Department of Environmental Engineering (2009)
The effect of heterogeneity correlation scale of hydraulic conductivity (K), equilibrium distribution coefficient (Kd) and mass transfer rate on the design and cost of the P&T remediation system for different heterogeneity levels (defined by the variance (σ2lnK)) and parameter distributions under the rate-limited sorption conditions was evaluated in this study. In addition, the impacts of initial amount of contaminant mass and plume configuration on the remediation design and cost were explored. The effects...
Citation Formats
M. Kutay, M. Güler, and A. Aydilek, “Analysis of factors affecting strain distribution in geosynthetics,” JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, pp. 1–11, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/45736.