International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 05 | May 2023
p-ISSN: 2395-0072
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FEA of Ultra High Performance Fibre Reinforced Concrete -Encased Steel Composite Beams Simi K R1, Ancy Eldho2, Manjusha Mathew3 1M Tech, Structural and Construction Management, MGMCET, APJ Abdul Kalam Technical University, Kerala, India 2,3Assistant professor, Civil Department, MGMCET, Pampakuda P.O, Muvattupuzha, Kerala, India
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Abstract – The steel- Ultra high performance fiber reinforced concrete composite (UHPFRC) beams is simulated as non linear finite element model, to compare the behaviour of each elements individually and as composite beam. Three types models are analyzed, steel beam with and without vertical stiffeners, an UHPFRC beam and a composite UHPFRC beam. The study investigated the encasement effect of steel, the role of shear span to depth (a/d) ratio in composite beam and the effect of effective length of the steel beam on ductility, stiffness, ultimate load bearing capacity and failure pattern of composite sections.
sections can withstand in high stresses and have excellent ductility.
1.2 Use of UHPFRC The UHPFRC matrix is composed of high amount of cement and silica fume, steel fibers, very low Water/cement ratio (0.18 to 0.25) and water reducers. It offers almost no shrinkage or creep and making it very suitable for concrete members under long-term loading. Compared to normal strength concrete, UHPFRC shows strain-hardening behaviour due to the bridging effect of short fibers. Presence of nano-additives improve the mechanical properties refines the pore structure, favours cement hydration, and improves durability. Moreover, in the cracked state, nano-constituents improve the self-healing capacity of concrete. Due to the dense microstructure and damage-tolerance characteristics, the UHPFRC provides significant enhancement in the sustainability of concrete members. The prestressed hybrid pedestrian bridge at Sherbrooke in Canada, is the first structural application of UHPFRC, which was constructed in 1997. 60meter is the total span length of the bridge.
Key Words: Composite beams; Ultra high performance; Numerical models; Shear response; Encased beams; Non-linear analysis; Encased effect
1.INTRODUCTION To meet the requirements of globalization, India has doing a major leap on infrastructures development such as express highways, industrial and power structures, large dams etc. Conventionally, for the construction of civil engineering works, concrete play main role and a large quantum of concrete is being utilized. To achieve the intended durability and sustainability, the current infrastructure incorporates a mix of unique design styles, powerful technology, and highend durable construction materials. The Construction Materials & Technology Promotion Council (BMTPC) was established by the Indian government in 1990 to encourage and promote the use of sustainable, energy-efficient, and environmental friendly building materials. This leads to the evelution of composite section. Pure steel and concrete construction now replacing with steel concrete composite sections and it accepted as a suitable alternative.
2. PERFORMANCE ANALYSIS OF MODELS There are four beam models with total five patterns considered under three concepts. They are shown in table 1 and the model geometries are shown in figure 1, 2, 3 and 4. The density of UHPFRC can vary depending on its specific composition and the proportion of fibers used, but typically ranges from 2200 kg/m3 to 2600 kg/m3. The density of steel fibers used in UHPFRC can also vary depending on their specific composition and shape. However, as a general approximation, the density of steel fibers used in UHPFRC ranges from 7800 kg/m3 to 8000 kg/m3. The addition of steel fibers to UHPFRC can significantly improve its mechanical properties, such as its tensile and flexural strength, as well as its resistance to cracking and impact. Table 2 shows the material properties adopted for analysis. The simulation process was carried out with ANSYS Workbench 2019 R3.
1.1 Composite Structures Using reinforced concrete member, increase the size of structure and cost of construction with load and span. It’s possible with composite sections, same cross sections with different load and moment resistances can be created by changing the steel thickness, concrete strength and size of reinforcement. It helps the section to keep the outer dimensions as constant, and it makes more easiness in the construction and architectural detailing. The composite
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