Performance based assessment of rammed aggregate piers

Within the confines of this paper, a normalized displacement-based capacity mobilization scheme is presented for rammed aggregate piers (RAP). For this purpose, field load tests, performed on 63 RAPs, in Turkey, were assessed. Site investigations at these sites revealed that generalized soil profiles are mostly composed of normally consolidated clay layers extending to a depth of 18 m. Below this depth, usually medium dense to dense sand / hard greywacke / very stiff to hard clay layers are present. A weighted mean SPT N6o assessment procedure was utilized to estimate representative soil strength and stiffness parameter in cohesive soils. The results of RAP load tests were summarized in the form of normalized mobilized capacity versus settlement curves as a function of representative SPT N60 values. The normalized field load test database revealed that: i) the shaft resistance is observed to be fully mobilized at normalized displacements of 40 % of RAP diameter for very soft clays and at 10 % of RAP diameter for firm clays, ii) up to normalized displacements of 2-5% of RAP diameter, 30-50% of the shaft resistance capacity is mobilized in a rather linear elastic manner, iii) normalized capacity mobilization response of RAPs is more flexible than the ones of bored concrete piles, iv) under compressive loads, RAPs exhibit a strain hardening response, as a result of which, the design-basis capacity is dominated by allowable settlement criterion. The proposed normalized capacity and displacement response curves, presented herein enable displacement (performance)-based assessment and design of RAPs.
16th European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015


Economic appraisal of the Bosphorus Tube Tunnel and Đstanbul Metro alternative and their environmental impacts
Karataş, Cevat (Orta Doğu Teknik Üniversitesi (Ankara, Turkey), 2001)
The purpose of this paper is to provide a detailed analysis of the Bosphorus Tube Tunnel and a number of alternative İstanbul metro systems. An attempt is made to compare economically the Bosphorus Tube Tunnel with an Đstanbul Metro system via Taksim and combined alternative which comprises both the Bosphorus tube Tunnel and the Đstanbul metro system by refering to a future no-build baseline alternative. In the analysis, the Little-Mirrlees appraisal method is adopted that requires the estimation of na...
Examination of differences between three SPT-based seismic soil liquefaction triggering relationships
Çetin, Kemal Önder; Kayen, Robert E.; Moss, Robb E. S.; Bilge, Habib Tolga; Ilgaç, Makbule (Elsevier BV, 2018-10-01)
The preceding companion paper presented the updating of the seismic soil liquefaction triggering relationship of Cetin et al. [1], and compared the resulting updated relationship with the earlier version. In this second paper, a detailed cross-comparison is made between three triggering relationships: (1) Seed et al. [2], as slightly updated by the NCEER Working Group (Youd et al. [3]), (2) Boulanger and Idriss [4], and (3) Cetin et al. [5]. Differences between these three triggering relationships, and the ...
Simulation of Through Hardening of SAE 52100 Steel Bearings Part II Validation at Industrial Scale
Evcil, Elif; Müştak, Ozan; Şimşir, Caner (null; 2015-09-23)
In this study, the material dataset presented in part I of this article is validated at industrial scale in batch through‐hardening of bearing races. The material dataset acquired is implemented in a commercial heat treatment simulation software. Heat transfer coefficients for the oil and salt bath are determined by using a commercial standard quench probe. Zone temperatures and transfer times of the roller‐belt furnace are measured directly from the system.Through‐hardening of inner ring (IR) of 6813 beari...
Behavior and modeling of nonprismatic members having T-sections
Balkaya, C (American Society of Civil Engineers (ASCE), 2001-08-01)
This paper emphasizes the discrepancies in conventional methods of analyzing nonprismatic members having T-sections. In practice, the change in the location of the centroidal axis over the length of nonprismatic members is ignored in structural analysis. Commonly used portland Cement Association tables for fixed-end moment and stiffness factors are based on the assumptions of a straight-line centroidal axis and variable rectangular cross section: However, discontinuities in the centroidal. axis produce stro...
Use of simulated ground motions for the evaluation of energy response of simple structural systems
Karim Zadeh Naghshineh, Shaghayegh; Askan Gündoğan, Ayşegül; Erberik, Murat Altuğ (Elsevier BV, 2019-08-01)
The literature on energy-based seismic design and assessment methodologies of structural systems mostly relies on real ground motion datasets. However, certain bias exists due to lack of homogeneity in available ground motion datasets. In this study, a large set of ground motions is simulated. Next, the effects of various parameters on seismic behavior of SDOF systems in terms of energy are studied using nonlinear time history analyses. The stochastic finite-fault simulations are performed on the western pa...
Citation Formats
K. Ö. Çetin and Ö. Lale, “Performance based assessment of rammed aggregate piers,” Edinburgh, United Kingdom, 2015, p. 1059, Accessed: 00, 2021. [Online]. Available: