Durability design and quality assurance of major concrete. However, more sophisticated numerical models are available that incorporate coupled pmv behavior. Computer nonlinear analysis of reinforced concrete structures. Smallscale modeling of reinforced concrete structural.
Dec 12, 2016 current engineering practice typically relies on the use of fiberbased modeling approaches with uncoupled axialbending pm and shear v responses to simulate nonlinear behavior of reinforced concrete rc structural walls. When designing new buildings, structural engineers refer to asce 705 asce, 2005 for loads and analysis procedures. Structural optimization of reinforced concrete spatial structures with different structural openings and forms agim seranaj1, erald elezi 2, altin seranaj 1department of structural mechanics, polytechnic university of tirana, albania 2department of building constructions and transport infrastructure, polytechnic university of tirana, albania. Concrete and reinforcing steel are considered to be two separate bodies, and bond is represented by the geometric contact of the two bodies. Seismic design aids for nonlinear analysis of reinforced. Their combined citations are counted only for the first article. May 10, 2011 in this contribution, a strainbased constitutive law for concrete within the framework of continuum damage mechanics is proposed. In mesoscopic level, concrete consists of mortar and aggregate. The constitutive model for plain concrete has been presented and verified in a companion paper. Analysisoriented stressstrain models for frpconfined concrete. Current engineering practice typically relies on the use of fiberbased modeling approaches with uncoupled axialbending pm and shear v responses to simulate nonlinear behavior of reinforced concrete rc structural walls. Homogeneous structural solid with simplified enhanced strain formulation is used to model steel plate for application of load.
By koichi maekawa, tetsuya ishida, toshiharu kishi. Structural optimization of reinforced concrete spatial. Yielding of shear connections in this wall may cause increase in energy dissipation, forming a structural damper that is based on structural passive control. Analysisoriented stressstrain models for frpconfined. Analysis fundamentals 5 the eurocodes are based on the limit state approach in combination with a system of characteristic values and partial factors. Centrifuges are employed in geotechnical modeling so that the nonlinear constitutive behavior of soil in smallscale models can be correctly modeled at prototype scale. The mvlem element command is used to generate a twodimensional multipleverticallineelementmodel mvlem. Jun 12, 2014 seismic design aids for nonlinear analysis of reinforced concrete structures. Multi scale modeling of structural concrete k by randee. Multiscale modeling of concrete performance integrated material and structural mechanics article pdf available in journal of advanced concrete technology 12 january 2003 with 314 reads. The commonly used material models and modelling principles are briefly introduced followed by a handson training on the computer. A novel multiscale approach for analysis of reinforced concrete structural elements that overcomes two major hurdles in utilization of multiscale technologies. Many stressstrain models have been developed for fibrereinforced polymer frpconfined concrete.
The model allows for the multiaxial simulation of predominantly tensile loaded plain concrete structures. Particles are represented as ellipsoides, generated according to a prescribed grading curve and placed randomly into the specimen. Multiscale modeling of concrete and of the frpconcrete. The posttensioning pt strands were modeled as one solid cylinder with an equivalent diameter representing the total area of all pt strands. For both tests, a square concrete specimen with 300mm size was used, a quarter of which was modeled exploiting symmetry. In order to evaluate the effect of concrete quality chloride diffusivity, four different concrete mixtures were produced for which the 28day chloride diffusivity was determined nordtest 1999. Detailed threedimensional nonlinear hybrid simulation for the analysis of largescale reinforced concrete structures. Multiscale modeling of structural concrete 1st edition. Precast concrete systems for buildings are costefficient, structural systems that provide speed and ease of erection. Nonlinear finite element analysis and modeling of a precast. In this paper some new formulations by adding deterioration processes in.
Nonlinear analysis of reinforced concrete threedimensional. Pointhingeorlumpedinelasticitymodels withphenomenologicalm. Principles of durability design for concrete structures. This includes the choice of modeling software and convergence and validation checks. It can also be adapted with other computational models to form a complete fully multiscale modeling framework, from nano to macro scale. The building is residential and has a reinforced concrete frame structural system. During recent years, interest in nonlinear analysis of concrete structures has increased steadily, because of the wide use of plain, reinforced and prestressed concrete as a structural material, and because of the development of relatively powerful finite element procedures l. Seismic design aids for nonlinear analysis of reinforced concrete structures. In this way, it is possible to quickly calculate alternative designs using different concrete strength classes or modified cross.
Multiscale modeling of structural concrete koichi maekawa. Flexural modeling of reinforced concrete walls model. Practical nonlinear modeling of reinforced concrete. His research interests include structural modeling, analysis, identification, and control. Multiscale modeling of structural concrete performance is presented as a systematic knowledge base of coupled cementitious composites and structural mechanics. Tools to safeguard new buildings and assess existing ones nonlinear analysis methods such as static pushover are globally considered a reliable tool for seismic and structural assessment.
The modeling parameters to characterize the interlayer using data from the laboratory testing are also outlined. The latter is accomplished by means of reduced order homogenization customized for structural elements. In the first time a set of dynamic analysis are carried out to compute dynamic properties of the building fundamental period. Doi link for multiscale modeling of structural concrete.
The particles are considered as sands, and the matrix as cement paste for mortar model. Increases in computer power have now enabled engineers to combine materials science with structural mechanics in the. Modelbased simulation of reinforced concrete structures. Modelling of concrete buildings for practical nonlinear seismic response analysis spreadovertherestofthelengthwithfurtherloading. Teng1, 1department of civil and structural engineering. Evaluation of the fracture process in this level is useful to quantify concrete properties in macro level in which the concrete is assumed homogeneous. Priestley, published in this journal volume 97, number 3, mayjune 2000, is presented. A sdvosb service disabled veteran owned small business. The techniques developed have become especially useful for the performance assessment of such structures under coupled mechanistic and environmental actions.
They allow for improved quality control in the precast plants, and freedom in the architectural form of the members. Pdf on jan 1, 2009, koichi maekawa and others published multiscale modeling of structural concrete find, read and cite all the research you need on researchgate. A secondorder integrity tensor is chosen as the internal damage variable to consider the phenomenon of loadinduced anisotropy. Numerical modelling and fullscale testing of concrete.
Increases in computer power have now enabled engineers to combine materials science with structural mechanics in the design and the assessment of concrete structures. From the crossscale modeling point of view, the material mesostructures of both mortar and concrete can be represented by particles embedded in matrix material model. Home usace technical letters index nonlinear, incremental structural analysis of massive concrete structures. Algorithms are proposed to generate realistic particle configurations efficiently. An integrated computational scheme is proposed for lifespan simulation of reinforced concrete. The results from the tests were used as the basis for the analysis where soil was modelled as 20node solid elements. Multiscale modeling of reinforced concrete structures. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. In this paper, a mesoscale model of concrete is presented, which considers particles, matrix material and the interfacial transition zone itz as separate constituents. However, due to the problems complicated nature, there exists no commonly accepted methodology or a design code.
Janfeb 2014 principles of durability design for concrete structures mark g. Nonlinear analysis of reinforced concrete threedimensional structures professors graham h. Nonlinear finite element analysis and postprocessing of reinforced concrete structures under transient creep strain akira jodai master of applied science graduate department of civil engineering university of toronto 20 abstract a suite of nlfea programs, vector, has been developed at the university of toronto. Detailed threedimensional nonlinear hybrid simulation for the analysis of largescale reinforced concrete structures markou, george on. Conte is an associate professor of structural engineering at the university of californiasan diego, san diego, calif. Table 3 shows the soil, concrete and steel models to analyze the behavior of the bridge by sap 2000. The constitutive model for plain concrete has been prese. Concrete materials and structural integrity research unit. Modelbased simulation of reinforced concrete structures many reinforced concrete structures, e. Introduction concrete is a composite material consisting of aggregate and mortar in mesoscopic level. Nonlinear finite element analysis and postprocessing of. This paper mainly uses ansys, the finite element analysis software, to make nonlinear analysis of reinforced concrete beam. Flexural modeling of reinforced concrete walls model attributes.
Concrete is a quasibrittle material and has highly. Disclaimer all the opinions and statements expressed in the papers are on the responsibility of authors and are. Structural engineers involved in analysis and design of concrete members and structures, students and academics. The structural model development for ubol faulting is then discussed. Comparison of modeling methods of drilled shaft foundation. Conservation of moisture, carbon di oxide, oxygen, chloride, calcium and momentum is solved. Numerical simulation of fracture process of concrete model by rigid body spring method kouhei nagai1, yasuhiko sato 2, tamon ueda 2 and yoshio kakuta abstract. The structural reinforced concrete wall energy dissipator, named and structural slit wall with shear connections, remove some of the problems encountered with ordinary structural walls. Nonlinear analysis of reinforced concrete column with ansys.
The structural engineering community is increasingly using nonlinear static or dynamic analysis to evaluate the response of a structure subjected to seismic events. The comparison shows that ansys analysis results are similar to experimental results, which indicates ansys analysis software can be used to. The hybrid connection is modeled with dimensions and reinforcement details as illustrated in fig. Rigid body spring method is a useful analytical method to simulate discrete behavior like fracture. There is an ongoing debate, in concrete science and engineering, whether cementitious materials can be viewed as poromechanics materials in the sense of the porous media theory. A discussion of a paper with the aforementioned title by m. Multiscale modeling of structural concrete koichi maekawa, tetsuya ishida, toshiharu kishi this book draws on the fields of materials and structural mechanics in an integrated way to address the questions of management and maintenance. Development of a joint faulting model for unbonded. A threedimensional 3d model for finiteelement fe analysis of reinforced concrete rc based on smeared cracking approach is presented. Principles of durability design for concrete structures mark g.
For this, each participant will be provided with the structural analysis and design software sofistik which will be installed on the participants personal laptop. A single model element incorporates six global degrees of freedom, three of each located at the center of rigid top. Links two active fields in materials science and structural engineering. Comparison between researchoriented and professionaloriented structural analysis software, in order to identify analytical tools that satisfy both modeling precision and computational speed. Nonlinear finite element analysis and modeling of a. Nonlinear analysis and constitutive models of reinforced concrete. Solid185 element homogeneous structural solid in ansys 2. In this contribution, a strainbased constitutive law for concrete within the framework of continuum damage mechanics is proposed. The structural behavior of reinforced concrete rc beams subjected to nonuniform rebar corrosion is studied here by developing a simplified numerical approach using threedimensional 3d. For achieving durable structures in all phase of design, construction, use, inspection and maintenance adequate quality must be provided. Structural optimization of reinforced concrete spatial structures with different structural openings and forms.
Newmark block model of seismic displacement of a slope. Comprehensive coverage of durability of concrete at both material and structural levels, with design related issues. Nonlinear finite element analysis of reinforced concrete structures subjected to impact loads design of reinforced concrete structures against extreme loads, such as impact and blast loads, is increasingly gaining importance. Models of soils, concrete and steel model soil concrete and steel. Nov 30, 2012 increases in computer power have now enabled engineers to combine materials science with structural mechanics in the design and the assessment of concrete structures. Nonlinear analysis of reinforced concrete beam by ansys.
The finite element model is developed to accurately represent the geometrical configuration and dimensions of the test specimen mpz4. Mvlem multipleverticallineelementmodel for rc walls. This paper discusses the modeling of reinforced concrete structural elements for use in geotechnical centrifuge modeling of soilstructure interaction problems. The multiscale modeling scheme proposed in this topic can be used by researchers in concrete community, to study the various factors which influence the mechanical performance of cementitious materials. Practical application of fembased analysis, modelling and. It provides options for the evaluation of rstab internal forces in various design cases. Seismic behavior and modeling of reinforced concrete building columns. Filippou graduate students vipul prakash and scott campbell department of civil engineering university of california, berkeley january 15, 1990july 15, 1991. Before being used for modeling the frpconcrete interface, the mesomechanical concrete model described in the previous section was tested under simple loading conditions, i. Fullscale lateral loading tests were carried out on hollowprecastprestressed concrete piles embedded into the ground. Development of a joint faulting model for unbonded concrete. Seismic damage prediction of reinforced concrete buildings.
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