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Experimental And Analytical Investigation On Impact Behavior Of Conventional And Steel Fiber Reinforced Concrete Beams

Oluşturulma Tarihi: 10-08-2018

Niteleme Bilgileri

Tür: Tez

Alt Tür: Doktora (Mühendislik)

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): Bina inşaatı sistemleri, İnşaat ve bina tasarım detayları,

Yazar(lar): Najah, Azdeen Saleh (Yazar), Mertol, Halit Cenan (Yazar),

Emeği Geçen(ler):

Anahtar Kelimeler

Drop-hammer testing apparatus, impact loading, ANSYS, RHT ConcreteModel, steel fiber reinforced concrete, high-speed camera, TEMA Motion AnalysisSoftware, velocity-time relationships


Özet

This research investigated the experimental and analytical behavior of unreinforcedand reinforced concrete beams cast using conventional concrete (CC) and steel fiberreinforced concrete (SFRC) under impact loading. Dramix ZP-305 type steel fiberswere used for SFRC. Half of the beam specimens were unreinforced and the otherswere reinforced using one 8 mm diameter steel reinforcement fixed at center ofspecimen cross section. Cylinder concrete compressive strengths used in this studywere 12 and 26 MPa for CC specimens and 35 MPa for SFRC specimens. Beamspecimens had 60×60×500, 100×100×500, and 150×150×500 mm dimensions. Thespecimens were tested under impact loading using a drop-hammer testing apparatushaving a weight of 58.5 N. This weight was dropped from various heights (1.20,2.00, and 2.95 m for unreinforced specimens and 2.95, 3.00, and 3.04 m forreinforced specimens) based on specimen sizes. The slow motion videos of the testedspecimens were recorded using a high-speed camera having a frame rate of 2000 fps.Experimental velocity-time relationships for hammer were obtained by analyzing ofrecorded impact videos using the TEMA Motion Analysis Software. Beams,hammer, and supports were modeled in ANSYS Finite Element Analysis Programand parameters related to modeling were calibrated based on the test results. Riedel,Hiermaier, and Thoma (RHT) Concrete Model was used in ANSYS DynamicExplicit AUTODYN solver. The results were compared to the experimental studieson CC and SFRC in this research and input parameters of the model were modified.Comparisons of the experimental and modeling results indicated that velocity-timeiirelationships of hammer showed very good agreement for various concretecompressive strengths and dimensions of specimens. It can be concluded that thecalibrated concrete model presented in this study could provide some generalguidelines for predicting the behavior of reinforced and unreinforced CC and SFRCunder impact loading.


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