A COMPARATIVE FIELD STUDY OF THE BEHAVIOR OF RAMMED AGGREGATE PIERS AND CONCRETE PIERS UNDER UPLIFT LOADS

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NIROUMAND B.

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Journal: Sharif Journal of Civil Engineering Year:2016 | Volume:31-2 | Issue:4.1 Page(s): 15-22

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Title

A COMPARATIVE FIELD STUDY OF THE BEHAVIOR OF RAMMED AGGREGATE PIERS AND CONCRETE PIERS UNDER UPLIFT LOADS

Author(s)

NIROUMAND B. | Issue Writer Certificate

Keywords

RAMMED AGGREGATE PIERSQ2

CAST-IN-PLACE DRILLED CONCRETE PIERSQ2

UPLIFT LOAD TESTQ2

DESIGN LIMIT LOADQ2

PIER DEFFECTIONQ2

Abstract

This paper aims to compare the behavior and design limit parameters of RAMMED AGGREGATE PIERS (RAPs) and of CAST-IN-PLACE DRILLED CONCRETE PIERS (CPs) under in situ uplift loading. Usually, RAPs and CPs are two new and common systems for strengthening foundations against uplift loads used in buildings with braced frames. In this research project, two groups of small scale RAPs and CPs were constructed and tested on site. The single piers had a fixed diameter of 135 mm and variable lengths of 300, 550, 650 and 850 mm. The test site was the Bushehr Special Economic Zone, where the testing area was made up of a uniform layer of moist silt; 1.2 meters thick and sti . The trial piers were constructed and loaded in a linear row at a safe distance from each other.For uplift loading, a mobile reaction beam system, made up of a heavy cart, modular rails and an uplift loaded frame, was utilized. Results show that on average, the measured load and pier deflection at the design limit of RAPs were 1.36 and 1.32 times the corresponding values in CPs, respectively. The behavior of CPs was rigid at various lengths. The behavior of RAPs with slenderness ratios of less than 4 was similar to that of the CPs, and the behavior of RAPs with slenderness ratios of higher than 4 was ductile. There was better agreement between the results of the calculated and measured uplift loads in CPs than in RAPs. The stiff ness modulus of both types of pier was the same at different lengths under uplift loads. In general, it seems that these technical merits, including the fact that RAPs (unlike CPs) do not need cement, has convinced engineers to use RAPs under uplift loading and do more research in this area.

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APA: Copy

NIROUMAND, B.. (2016). A COMPARATIVE FIELD STUDY OF THE BEHAVIOR OF RAMMED AGGREGATE PIERS AND CONCRETE PIERS UNDER UPLIFT LOADS. SHARIF: CIVIL ENINEERING, 31-2(4.1), 15-22. SID. https://sid.ir/paper/127869/en

Vancouver: Copy

NIROUMAND B.. A COMPARATIVE FIELD STUDY OF THE BEHAVIOR OF RAMMED AGGREGATE PIERS AND CONCRETE PIERS UNDER UPLIFT LOADS. SHARIF: CIVIL ENINEERING[Internet]. 2016;31-2(4.1):15-22. Available from: https://sid.ir/paper/127869/en

IEEE: Copy

B. NIROUMAND, “A COMPARATIVE FIELD STUDY OF THE BEHAVIOR OF RAMMED AGGREGATE PIERS AND CONCRETE PIERS UNDER UPLIFT LOADS,” SHARIF: CIVIL ENINEERING, vol. 31-2, no. 4.1, pp. 15–22, 2016, [Online]. Available: https://sid.ir/paper/127869/en

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