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. Durability design and quality assurance of major concrete. Seismic damage prediction of reinforced concrete buildings. An integrated computational scheme is proposed for lifespan simulation of reinforced concrete.
Development of a joint faulting model for unbonded 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. It provides options for the evaluation of rstab internal forces in various design cases. 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. 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. Concrete is a quasibrittle material and has highly. 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. A single model element incorporates six global degrees of freedom, three of each located at the center of rigid top. However, more sophisticated numerical models are available that incorporate coupled pmv behavior. Their combined citations are counted only for the first article. Disclaimer all the opinions and statements expressed in the papers are on the responsibility of authors and are. The latter is accomplished by means of reduced order homogenization customized for structural elements. Smallscale modeling of reinforced concrete structural.
Structural optimization of reinforced concrete spatial structures with different structural openings and forms. For achieving durable structures in all phase of design, construction, use, inspection and maintenance adequate quality must be provided. They allow for improved quality control in the precast plants, and freedom in the architectural form of the members. Detailed threedimensional nonlinear hybrid simulation for the analysis of largescale reinforced concrete structures. 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. Janfeb 2014 principles of durability design for concrete structures mark g.
Models of soils, concrete and steel model soil concrete and steel. Before being used for modeling the frpconcrete interface, the mesomechanical concrete model described in the previous section was tested under simple loading conditions, i. Multiscale modeling of structural concrete koichi maekawa. Teng1, 1department of civil and structural engineering. 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.
Comparison between researchoriented and professionaloriented structural analysis software, in order to identify analytical tools that satisfy both modeling precision and computational speed. Principles of durability design for concrete structures mark g. Nonlinear analysis of reinforced concrete threedimensional. Mvlem multipleverticallineelementmodel for rc walls.
The reason for this debate is that a main part of the porosity of these materials manifests itself at a scale where the water phase cannot be considered as a bulk water phase, but as structural water. Conservation of moisture, carbon di oxide, oxygen, chloride, calcium and momentum is solved. The model allows for the multiaxial simulation of predominantly tensile loaded plain concrete structures. The mvlem element command is used to generate a twodimensional multipleverticallineelementmodel mvlem. Nonlinear finite element analysis and modeling of a. The modeling parameters to characterize the interlayer using data from the laboratory testing are also outlined. When designing new buildings, structural engineers refer to asce 705 asce, 2005 for loads and analysis procedures. Precast concrete systems for buildings are costefficient, structural systems that provide speed and ease of erection. 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. Analysisoriented stressstrain models for frpconfined concrete. The model simulating the test process was established, the calculation results of ansys are compared with the experimental results. Comprehensive coverage of durability of concrete at both material and structural levels, with design related issues. Concrete and reinforcing steel are considered to be two separate bodies, and bond is represented by the geometric contact of the two bodies. The commonly used material models and modelling principles are briefly introduced followed by a handson training on the computer.
Rigid body spring method is a useful analytical method to simulate discrete behavior like fracture. Table 3 shows the soil, concrete and steel models to analyze the behavior of the bridge by sap 2000. By koichi maekawa, tetsuya ishida, toshiharu kishi. May 10, 2011 in this contribution, a strainbased constitutive law for concrete within the framework of continuum damage mechanics is proposed. The constitutive model for plain concrete has been prese. The particles are considered as sands, and the matrix as cement paste for mortar model. Structural optimization of reinforced concrete spatial. The constitutive model for plain concrete has been presented and verified in a companion paper. Nonlinear analysis of reinforced concrete threedimensional structures professors graham h.
The structural model development for ubol faulting is then discussed. This paper discusses the modeling of reinforced concrete structural elements for use in geotechnical centrifuge modeling of soilstructure interaction problems. 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. It can also be adapted with other computational models to form a complete fully multiscale modeling framework, from nano to macro scale. Solid185 element homogeneous structural solid in ansys 2. The structural engineering community is increasingly using nonlinear static or dynamic analysis to evaluate the response of a structure subjected to seismic events. Pointhingeorlumpedinelasticitymodels withphenomenologicalm. 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. 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. 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. Multiscale modeling of structural concrete 1st edition.
Detailed threedimensional nonlinear hybrid simulation for the analysis of largescale reinforced concrete structures markou, george on. Introduction concrete is a composite material consisting of aggregate and mortar in mesoscopic level. Nonlinear analysis of reinforced concrete beam by ansys. For both tests, a square concrete specimen with 300mm size was used, a quarter of which was modeled exploiting symmetry. Multiscale modeling of reinforced concrete structures. The finite element model is developed to accurately represent the geometrical configuration and dimensions of the test specimen mpz4. The comparison shows that ansys analysis results are similar to experimental results, which indicates ansys analysis software can be used to. Yielding of shear connections in this wall may cause increase in energy dissipation, forming a structural damper that is based on structural passive control. Multi scale modeling of structural concrete k by randee. Nonlinear finite element analysis and modeling of a precast. Seismic design aids for nonlinear analysis of reinforced concrete structures. Computer nonlinear analysis of reinforced concrete structures. Modelling of concrete buildings for practical nonlinear seismic response analysis spreadovertherestofthelengthwithfurtherloading.
Nonlinear finite element analysis and postprocessing of. Flexural modeling of reinforced concrete walls model attributes. A discussion of a paper with the aforementioned title by m. Analysis fundamentals 5 the eurocodes are based on the limit state approach in combination with a system of characteristic values and partial factors. 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 and constitutive models of reinforced concrete. Seismic behavior and modeling of reinforced concrete building columns. Principles of durability design for concrete structures. Jun 12, 2014 seismic design aids for nonlinear analysis of reinforced concrete structures. Many stressstrain models have been developed for fibrereinforced polymer frpconfined concrete. A sdvosb service disabled veteran owned small business.
Algorithms are proposed to generate realistic particle configurations efficiently. Evaluation of the fracture process in this level is useful to quantify concrete properties in macro level in which the concrete is assumed homogeneous. For this, each participant will be provided with the structural analysis and design software sofistik which will be installed on the participants personal laptop. Seismic design aids for nonlinear analysis of reinforced. Comparison of modeling methods of drilled shaft foundation.
Numerical modelling and fullscale testing of concrete. However, due to the problems complicated nature, there exists no commonly accepted methodology or a design code. Filippou graduate students vipul prakash and scott campbell department of civil engineering university of california, berkeley january 15, 1990july 15, 1991. Multiscale modeling of structural concrete performance is presented as a systematic knowledge base of coupled cementitious composites and structural mechanics. Priestley, published in this journal volume 97, number 3, mayjune 2000, is presented. Newmark block model of seismic displacement of a slope. In this way, it is possible to quickly calculate alternative designs using different concrete strength classes or modified cross. In the first time a set of dynamic analysis are carried out to compute dynamic properties of the building fundamental period. The techniques developed have become especially useful for the performance assessment of such structures under coupled mechanistic and environmental actions. Links two active fields in materials science and structural engineering. Practical nonlinear modeling of reinforced concrete. 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. Analysisoriented stressstrain models for frpconfined. In this paper some new formulations by adding deterioration processes in.
Fullscale lateral loading tests were carried out on hollowprecastprestressed concrete piles embedded into the ground. 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. 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. Increases in computer power have now enabled engineers to combine materials science with structural mechanics in the. Practical application of fembased analysis, modelling and. The results from the tests were used as the basis for the analysis where soil was modelled as 20node solid elements. Multiscale modeling of concrete and of the frpconcrete. Home usace technical letters index nonlinear, incremental structural analysis of massive concrete structures. Modelbased simulation of reinforced concrete structures. In this contribution, a strainbased constitutive law for concrete within the framework of continuum damage mechanics is proposed. A secondorder integrity tensor is chosen as the internal damage variable to consider the phenomenon of loadinduced anisotropy. In this paper, a mesoscale model of concrete is presented, which considers particles, matrix material and the interfacial transition zone itz as separate constituents. The posttensioning pt strands were modeled as one solid cylinder with an equivalent diameter representing the total area of all pt strands.
Doi link for multiscale modeling of structural concrete. A novel multiscale approach for analysis of reinforced concrete structural elements that overcomes two major hurdles in utilization of multiscale technologies. The building is residential and has a reinforced concrete frame structural system. Particles are represented as ellipsoides, generated according to a prescribed grading curve and placed randomly into the specimen. In most cases durability concerns the serviceability of structures. This paper mainly uses ansys, the finite element analysis software, to make nonlinear analysis of reinforced concrete beam. In mesoscopic level, concrete consists of mortar and aggregate. 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. Modelbased simulation of reinforced concrete structures many reinforced concrete structures, e. Centrifuges are employed in geotechnical modeling so that the nonlinear constitutive behavior of soil in smallscale models can be correctly modeled at prototype scale. Structural engineers involved in analysis and design of concrete members and structures, students and academics. Concrete materials and structural integrity research unit. This includes the choice of modeling software and convergence and validation checks.
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