Seismic performance of steel-reinforced concrete composite columns of older and modern construction (original) (raw)
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IRJET, 2020
Composite structures render the eccentric possibility of ergonomic design of members and material in the case of vertical structures. Reinforced concrete structures are the traditionally preferred construction practice in most of the developing countries. A coalesced structural property of concrete and steel is achieved while using composite structures. Degrees of freedom plays a crucial role in enabling concurrent optimization in all aspects resulting in various ascendancies such as reduced structural weight, paramount dynamic stability, fire resistance, profitability, and, so on. This paper covers the review on the comparison of seismic behavior of composite columns with RCC columns under various physical conditions.
“Seismic Analysis of Multi-Storey Buildings with Composite Columns and RCC Beams”
Journal of emerging technologies and innovative research, 2020
In this work, a study was conducted on the behavior of composite columns, which are called reinforced concrete columns (SCC). The structure is exposed to a zone 5 seismic load according to IS 1893: 2016 and combinations of dead loads have been considered. The results of the bending moment and the lateral deformation of the frame are compared with the SAP 2000 software. In this study, an analysis of the two-span structure with a composite column with a seismic zone five according to IS 1893: 2016 was carried out and a comparison was made between bending moments, section modulus, deflections, shear force for seismic load and dead load.
Ernst & Sohn ce/papers 6 , 2023
Usable/rentable floor areas are crucial for the building owners in reinforced concrete (RC) tall buildings. To address this issue, concrete-encased (CE) or concrete-filled (CF) composite columns are proposed as alternative vertical load carrying elements by providing the required strength and ductility, but with smaller dimensions. Comparing the performance of columns with different configurations can be done using moment (M)-axial load (N) interaction curves. This paper summarizes the approaches proposed by Eurocode 4 and AISC 360-16 for both types of composite columns, presenting simplified and true curves for a specific class of sections. Two case studies involving hybrid RC tall buildings in Istanbul, which utilized composite columns, are presented along with a comparison with steel-concrete composite and RC solutions. Numerical results indicate that employing steel-concrete composite columns resulted in approximately 24% reduction in total cross-sectional areas for one of the case studies, leading to increased usable/rentable areas. Additionally, concrete-encased and concrete-filled composite columns exhibited similar performance in terms of axial load-moment capacities. The impact of longitudinal rebar ratios is also investigated, revealing that the AISC 360-16 approach yields smaller bending moments and compression capacities compared to Eurocode 4 due to the significant strength reduction factor considered in calculating the concrete contribution in composite sections.
Seismic Evaluation of Existing Reinforced Concrete Building Columns
Earthquake Spectra, 1996
Past earthquakes have emphasized the vulnerability of reinforced concrete columns having details typical of those built before the mid-1970s. These columns are susceptible to axial-flexural, shear, and bond failures, which subsequently may lead to severe damage or collapse of the building. Research was undertaken to investigate the lateral and vertical load-resisting behavior of reinforced concrete columns typical of pre-1970s construction. Eight full-scale specimens were constructed and were loaded with constant axial load and increasing cyclic lateral displacement increments until failure. Test data are presented and compared with behavior estimated by using various evaluation methods.
Comparison of Seismic Behavior of a Structure with Composite and Conventional Columns
2015
An extensive study has been carried out on the behavior of composite column in a structure. In composite column construction steel and concrete are united in such a manner that the advantages of the materials are employed in a efficient manner. By bonding and friction between steel and composite material these materials will accept the external loading in composite columns. In this study comparison of composite and conventional structure is carried out. Just varying the design of column i.e., by using composite and conventional column and keeping all other structural members same for both the structures. Composite column design is carried out according to Euro code 4 and conventional column design is by IS 456-2000. The buildings are taken to be true to be placed in III seismic zone. Seismic design is followed by IS 1893-2002. There are many different types of composite column from those we have taken concrete encased composite column for our analysis. Concrete encasement would incr...
Physical simulations of seven slender columns and five short columns subjected to shear reversals until axial failure were performed as part of a research program to develop a better understanding of the behavior of poorly detailed reinforced concrete columns and the risk that they pose to the collapse of older reinforced concrete buildings during strong earthquakes. Detailing of the columns was chosen to be representative of older building construction in the west coast of North America. Parameters in the study were axial load, amount and arrangement of the transverse reinforcement, span-to-depth ratio, and displacement history. Data generated from this recent test program and previous studies was analyzed in the context of rehabilitation standards and used to develop new criteria to account for the effect of displacement history and shear span-to-depth ratio on the performance parameters and acceptance criteria that can be implemented in the ASCE-41 standard.
Examining Seismic Response for Rigid Building Frame Having Composite Column
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
Concrete filled steel tubes are generally used in Beams, Columns, Piers and caissons for deep foundations. The steel tube functions as the formwork for casting the concrete and hence, construction cost is reduced. The prime focus of the present work is to study the behavior of RCC structure under the effect of seismic loads provided with composite columns. This research study comprises of seismic analysis with the design of rigid frame with Reinforced Concrete column, Concrete encased steel and steel tube encasing concrete columns. These cases are designed based on IS 1893:2016 using ETABS software. The result shows that steel encased concrete is performing better than conventional column. The construction practices is the only difficulty arises in such of composite column.
Seismic Performance Assessment of a Multistoried Building and Retrofitting of RC Columns
IOSR Journal of Mechanical and Civil Engineering, 2017
Earthquake is a major concerned natural disaster that causes great damage to the structure. Many multistoried commercial, factory and also residential building in Bangladesh are not designed properly considering seismic loads and also seismic zone effects, thereby large storey displacement and cracks have been observed in the structures. In the present study, a G+10 storied factory building is considered and finite element analysis software ETABS 2015 is used to determine the seismic demand and capacity of each structural element considering seismic zone 1 and zone 3. The building is preliminary designed and analyzed for zone 1 and found safe against seismic loads but vulnerable at zone 3. In the developing countries like Bangladesh, RC jacketing method is popular due to its cost effectiveness comparing with other strengthening methods. Therefore, in this study, a guideline for strengthening of columns only by RC jacketing method is discussed and analyzed. The columns having Demand Capacity Ratio (DCR) ratio more than 1.0 found from analysis are considered to strengthen. Pushover analysis is done to determine the performance of the structure before and after retrofitting and it is found that structure after retrofit have more base shear and displacement capacity, and less storey drift compared to unretrofitted structure.
DESIGN COMPARISON & RELIABILITY OF RCC & SRC COLUMNS FOR G+7 BUILDINGS
Journal ijetrm , 2024
With rapid urbanization there is an increased demand of public and residential spaces in cities with limited areas. Along with the living area, the land must be used for various other purposes such as farming, recreational activities, warehousing etc. Because of the fixed availability of the land to the mankind, the space cannot be increased. This has resulted in the construction to go upwards to mitigate the increasing demand for the housing spaces, i.e. high-rise buildings. Traditional RCC frame buildings face challenges of high section sizes and high reinforcement if the building is present in high seismic zones. In such cases utilization of SRC columns is beneficial if the cost of a pure steel frame building is deemed excessive. In present work a case study of two cases consists of RC and SRC Columns, (1) Seven story tall rectangular building (G+7) (regular geometry) and (2) Seven story tall L Shape building (G+7) (irregular geometry) is presented. The FEM modelling is performed on ETABS v16.2.1 and a validation study is presented for one typical column with AISC 360-05 and ETABS. The linear static analysis is performed, and results are presented to observe the effect of Steel reinforced column (SRC) in comparison with normal reinforced concrete column (RCC) building. Nonlinear static pushover analysis is also performed to study the performance of two building scenario against lateral loads. A parametric study is also performed with different column sizes and column arrangements to ascertain the reliability of SRC columns compared to RCC columns.