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Article | 28-August-2018

RESEARCH ON THE NEW CFRP PRESTRESSING SYSTEM FOR STRENGTHENING OF RC STRUCTURES

The paper presents a research on the new Polish CFRP prestressing system for strengthening of reinforced concrete structures. The system is called Neoxe Prestressing System II (NPS II). NPS II consists of two main elements: a special steel anchorages mounted on both ends of a single CFRP strip and a tensioning device. The anchorage is made of two steel plates. CFRP strip end is fixed between steel plates through bonding by epoxy resin and gripping by bolts. The tensioning device compatible with

Bartosz PIĄTEK, Tomasz SIWOWSKI

Architecture, Civil Engineering, Environment, Volume 10 , ISSUE 3, 81–87

research-article | 30-November-2018

EVALUATION OF TIME DEPENDENT PRESTRESS LOSSES IN PRETENSIONED CONCRETE MEMBER WITH TOP AND BOTTOM TENDONS

1. INTRODUCTION Prestress losses in a pretensioned concrete member are divided into two groups: immediate and time dependent. The immediate losses include losses due to elastic shortening of concrete, short term relaxation of prestressing tendons, increasing the temperature while curing concrete, friction at the deflecting devices, and seating of strand in the anchorage device. The time dependent losses are losses due to relaxation of prestressing steel, creep and shrinkage of concrete

Vadzim PARKHATS, Rafał KRZYWOŃ

Architecture, Civil Engineering, Environment, Volume 12 , ISSUE 3, 105–112

research-article | 08-April-2020

SHAPING OF AXIALLY COMPRESSED BIPOLARLY PRESTRESSED CLOSELY SPACED BUILT-UP MEMBERS

middle of the member span, equivalent to the spacer thickness; tdspacer thickness; Achcross-sectional area of one chord of the closely spaced built-up member; EYoung’s modulus; Jy,chmoment of inertia relative to the y axis of one chord of the closely spaced built-up member; Jz1, Jz2, Jz3moment of inertia of a composite section; Jz,srequivalent moment of inertia to the z-axis; Ltotal member length; L1extreme section length with straight member; L2prestressing zone length; prestressing range

Monika SIEDLECKA

Architecture, Civil Engineering, Environment, Volume 13 , ISSUE 1, 87–100

research-article | 30-November-2017

SHEAR CAPACITY OF PRESTRESSED FRC BEAMS WITH SPARSE STIRRUP SPACING

tensioning force that was applied by the manufacturer for the construction of the members. Concrete and steel stresses were verified in the initial state (t=0). The loss of prestressing force due to shrinkage, creep and relaxation was calculated and the distribution of effective prestress was determined in the final state (t=∞). Bending moment resistances of different beams were verified considering the calculated effective prestress values. In case of beam type R70, a 15 cm think in-situ concrete (grade

Kálmán KORIS, István BÓDI

Architecture, Civil Engineering, Environment, Volume 11 , ISSUE 1, 81–88

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