scholarly journals Mathematical Model of Hybrid Precast Gravity Frames for Smart Construction and Engineering

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Seon-Chee Park ◽  
Won-Kee Hong ◽  
Sunkuk Kim ◽  
Xiangyu Wang
Keyword(s):  
Hybrid Composite ◽  
Precast Concrete ◽  
Economic Feasibility ◽  
Mode Shapes ◽  
Environmental Friendliness ◽  
Composite Frames ◽  
Composite Frame ◽  
Frame System ◽  
Frame Systems ◽  
Simply Connected

The structural stability, constructability, economic feasibility, environmental-friendliness, and energy efficiency of hybrid composite frame systems have been demonstrated by practical application and research. A hybrid composite frame system combines the economy of precast concrete structures with the constructability of steel frame structures, including erection speed. Novel composite frames will ultimately maximize the efficiency of structural design and facilitate construction. This paper presents hybrid precast frames, which are precast composite frames based on a simple connection between precast concrete columns and beams. The hybrid precast frames designed to resist gravity loading consist of PC columns, PC beams, and steel inserted in the precast members. Steel sections located between the precast columns were simply connected to steel inserted at each end of the precast beams. Dynamic analysis of a 15-story building designed with the proposed composite frame was performed to determine the dynamic characteristics of a building constructed of hybrid frames, including frequencies and mode shapes.

scholarly journals Experimental Investigation on Double Skin Composite Tubular Column

2021 ◽  
Vol 9 (VI) ◽  
pp. 755-763
Author(s):  
K. C. Rajkumar
Keyword(s):  
Structural Engineering ◽  
High Strength ◽  
Frame Structure ◽  
Fiber Reinforced Polymers ◽  
Tubular Columns ◽  
Composite Frame ◽  
Steel Members ◽  
Frame System ◽  
Double Skin ◽  
Frame Systems

RCC and steel frames have been the most common frame systems for long times whereas composite frame system has also emerged as popular system for high rise buildings for few decades. Multi-storey composite frames are generally composed of structural steel members made composite with concrete. The use of Double-Skin Tubular columns in building construction has seen renaissance in recent years due to their numerous advantages, apart from its superior structural performance making a typical composite frame structure. Fiber reinforced polymers (FRPs), a relatively new class of non-corrosive, high-strength, lightweight material, have over the past approximately 15 years emerged as practical materials for a number of structural engineering applications. FRP has become one of the most popular methods in the repair and rehabilitation of concrete infrastructure due to its ease of application and the special physical characteristics. This paper focus to determine the compressive strength of columns in different type of specimens under Axial load.

scholarly journals Seismic Behavior of Mid-Rise Precast Reinforced Concrete Building with Effect of Joints and Supports

2019 ◽  
Vol 8 (4) ◽  
pp. 3633-3637
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Precast Concrete ◽  
Mode Shapes ◽  
Base Shear ◽  
Reinforced Concrete Building ◽  
Axial Forces ◽  
Building Models ◽  
Precast Buildings ◽  
Concrete Building

Precast concrete structures are widely used in construction. It consists of prefabricated elements casted in industry and connected to each other to form a homogeneous structure. Connections function is to transfer moments and axial forces. Many engineers assume precast connection as pinned, but in reality, they are semi-rigid connections that transfer forces to other members. Lack of design and detailing of connection leads to improper behaviour of the structure, which then leads to the collapse of the building. Past earthquake studies show that many precast buildings performed poorly, and the main reasons were connections. This paper mainly focuses on understanding the seismic behaviour of mid-rise i.e seven-storey precast reinforced concrete buildings with various beam-column joints i.e rigid, semi-rigid, pinned and column-base supports i.e, fixed and hinged supports. Building is modelled and analyzed using ETABS v17 software. Rotational stiffness of precast billet connection is adopted for modelling of semi-rigid beam-column connections. Response spectrum and modal analysis are carried out. Results of displacements, storey drift, storey shear, storey stiffness, base shear, time periods and first mode shapes of models are discussed. It is observed, precast reinforced concrete building models with semi rigid connection performs better than building models with pinned connections and building models with fixed supports reduces the structural response to a great extent.

Nonlinear Analysis of CFT Composite Frame with Floor Slab

2011 ◽  
Vol 243-249 ◽  
pp. 1168-1172
Author(s):  
Yuan Huang ◽  
Wei Jian Yi ◽  
Jian Guo Nie
Keyword(s):  
Seismic Behavior ◽  
Fe Analysis ◽  
Steel Beams ◽  
Plastic Behavior ◽  
Floor Slab ◽  
Panel Zone ◽  
Composite Frames ◽  
Composite Frame ◽  
Load Analysis ◽  
Analysis Models

Nonlinear finite element (FE) analysis models of CFT composite frames with floor slab were established by Msc.Marc to investigate the seismic behavior of composite frames. A number of material nonlinearities and contact nonlinearities, as well as geometry nonlinearities, were taken into account, including elastoplastic properties of steel and concrete, concrete cracking and tension stiffening, steel fracture, interface slip between concrete slabs and steel beams, P-D effects etc. The elasto-plastic behavior, as well as fracture and post-fracture behavior, of the FE analysis models agreed well with those of the test specimens. The beam and panel zone deformation of the analysis models is also in good agreement with that of the test specimen. It is concluded that FE analysis is useful not only for monotonic load analysis but also for cyclic load analysis. It is a helpful tool to expand the information on seismic behavior of composite frame.

scholarly journals DUCTILITY OF REINFORCED CONCRETE SUB FRAME FOR INDUSTRIALIZED BUILDING SYSTEM

2019 ◽  
Vol 81 (2) ◽  
Author(s):  
Ahmed Sabah Aljawadi ◽  
Abdul Kadir Marsono ◽  
Che Ros Ismail
Keyword(s):  
Reinforced Concrete ◽  
Earthquake Engineering ◽  
Precast Concrete ◽  
Accurate Determination ◽  
Concrete Specimen ◽  
Reinforced Concrete Beams ◽  
Test Scheme ◽  
Conventional Concrete ◽  
Frame System ◽  
Building System

An accurate determination of industrialized building system (IBS) frames ductility under alternating lateral loads is the key issue of this study. The performance features of IBS H frame assembly subjected to cyclic lateral pushover test with six attached IBS components are reported. A test scheme of nonlinear elastic sub-frame system is proposed to build an IBS structural building system. This system complies with the requirements of strength and ductility governed by European Codes 2 and 8. The three models are a conventional reinforced concrete H frame system CRCH (Model 1), IBS with steel conventional links as reinforcements IBSHN (Model 2), and special spiral links concrete IBSHS (Model 3). Each model is scaled to 1:5. All models are laboratory examined under cyclic lateral pushover test to failure, where the IBS connections are considered as hybrid partial rigid linking beams to columns. The beam ends are connected to column boxes via a U shaped steel plate. The experimental results of the IBS specimens are compared with the conventional reinforced concrete connection of similar shapes and size in the form of H sub-frame mechanism tested under the same condition. The models are subjected to cyclic lateral load controlled applied at the beam-column connection. The performance evaluation of IBS connections is made via load displacement hysteresis, ultimate and collapse parameter, ductility index, and surface cracks appearances. The conventional concrete specimen is obviously found to display better strength compared to IBS. Conversely, the ductility of IBS H frame specimen with spiral shear links and conventional closed loop links exhibits superior features compared to the conventional concrete specimen which is beneficial to earthquake engineering. It is demonstrated that the performance of the precast concrete structure is highly dependent on the ductile capacity of connectors to each of the IBS component. This is significant especially at the joints such as the beam-to-column connections. Our systematic methods on ductility characterizations of reinforced concrete beams may contribute toward the development of IBS in resisting earthquakes.

scholarly journals Comparative Studies between Precast and Conventional Cast-In-Situ Structural Systems

2021 ◽  
Vol 1197 (1) ◽  
pp. 012062
Author(s):  
Aman Agrawal ◽  
S.S. Sanghai ◽  
Kuldeep Dabhekar
Keyword(s):  
Comparative Studies ◽  
Concrete Structure ◽  
High Speed ◽  
Precast Concrete ◽  
Mode Shapes ◽  
Structural Systems ◽  
Seismic Loads ◽  
Time Frames ◽  
External Loads

Abstract In India, greatest constructional exercises are finished utilizing the old convectional cast in situ strategies since seemingly forever. As the nation is creating in a high speed, the necessity for lodging is heightening and in this way the development ventures are additionally blossoming quickly henceforth requesting quicker and better development techniques. This expanded interest can be coordinated by utilizing one of the cutting-edge innovations, pre-projected substantial strategy. Investigation of writing shows various priority of precast constructional strategy over different techniques for development. Appropriately, this investigation presents the examination and plan of g+5 floor precast concrete structure and traditional cast-in-situ structure. The designs were demonstrated and investigated utilizing Etabs programming for dead, forced, and seismic loads and for load combinations. The fundamental intention was to consider the conduct of both the sorts of structures under the previously mentioned loads and load mixes. Examination was directed dependent on different components like external loads, greatest deflections, most extreme story drifts, mode shapes, time-frames, frequencies and base shears.

Economic Feasibility Study of Self-Centering Concentrically Braced Frame Systems

2018 ◽  
Vol 144 (8) ◽  
pp. 04018101 ◽  
Author(s):  
Qindan Huang ◽  
Mojtaba Dyanati ◽  
David A. Roke ◽  
Akhilesh Chandra ◽  
Kallol Sett
Keyword(s):  
Feasibility Study ◽  
Economic Feasibility ◽  
Braced Frame ◽  
Concentrically Braced Frame ◽  
Concentrically Braced ◽  
Frame Systems

scholarly journals Proposals for the development of the system of taxation of transport tax (passenger car transport)

2019 ◽  
Vol 16 (4) ◽  
pp. 14-25
Author(s):  
A. M. Terekhov
Keyword(s):  
Russian Federation ◽  
Positive Impact ◽  
Current System ◽  
Current Method ◽  
Road Transport ◽  
Economic Feasibility ◽  
Transport Infrastructure ◽  
Environmental Friendliness ◽  
Method Of Calculation ◽  
The Russian Federation

The purpose of the study is to analyze the current system of transport taxation and develop proposals for its improvement. The article is devoted to the identification of ways to improve the system of taxation of transport tax on road transport in the Russian Federation, including the optimization of the current method of calculating the tax.Materials and methods. The article analyzes the literary sources of normative, reference and scientific literature on the organization of transport taxation. Based on the analysis of normative legal documentation the method of calculation of the transport tax on the automobile transport oper-ating in the Russian Federation is opened, shortcomings are revealed and the directions of its im-provement are designated. The statistical analysis of indicators of the taxation by the transport tax in the Russian Federation and Nizhny Novgorod Region is carried out. The authors also present statis-tical data on fuel prices in dynamics for three years, interrelation between the increase in the cost of fuel and the increase in fuel excises has been found. A generalization of the accumulated experience in the field of transport tax taxation in Russia and in foreign countries is given. The source data for this research were the materials of the report in the forms: 5-TN (2014-2017), NOM-1 (2014-2018), Internet information resources – бензин.рф and www.gks.ru.Results. This article highlights the features of the current system of taxation of transport tax, the importance of transport taxation for the formation of regional budgets. The inexpediency of replacing the transport tax with fuel excise is justified. The modified method of calculation of the transport tax on automobile transport, including for hybrid cars is developed. The values of the coefficients of environmental friendliness, market value, weight are proposed. In the process of analysis of statistical indicators of taxation the general trend of growth of tax revenues from individuals, reducing revenues from organizations was revealed. The tendency of fuel cost and fuel excise rates increase is established. The percentage ratio of the formation of the tax base for transport tax between taxpayers – legal entities and individuals is established. Conclusion. The use of the proposed methodology in practice will contribute to the implementation of the following regulatory principles of taxation: fairness, economic feasibility; as well as create the prerequisites for improving the environmental situation in the country by redirect-ing part of the funds from taxation to environmental funds. In this aspect, it is assumed that in view of the application of environmental coefficients, taxpayers will seek to upgrade their vehicles with more environmentally friendly, technical re-equipment of vehicles with modern and high environ-mental standards units. If the purpose of transport taxation is given, part of the collected funds can be directed to the development of transport infrastructure. The development of the tax system is an important area of the tax policy of the Russian Federation, as the optimization of the tax burden will contribute to the development of business, which will certainly have a positive impact on the financial and economic performance of enterprises in all spheres of activity.

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