In the first time a set of dynamic analysis are carried out to compute dynamic properties of the building fundamental period. Precast concrete systems for buildings are costefficient, structural systems that provide speed and ease of erection. Nonlinear analysis of reinforced concrete beam by ansys. Conte is an associate professor of structural engineering at the university of californiasan diego, san diego, calif. By koichi maekawa, tetsuya ishida, toshiharu kishi. It provides options for the evaluation of rstab internal forces in various design cases. Conservation of moisture, carbon di oxide, oxygen, chloride, calcium and momentum is solved. 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.
Practical nonlinear modeling of reinforced concrete. 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. Increases in computer power have now enabled engineers to combine materials science with structural mechanics in the design and the assessment of concrete structures. Priestley, published in this journal volume 97, number 3, mayjune 2000, is presented. The particles are considered as sands, and the matrix as cement paste for mortar model. Seismic damage prediction of reinforced concrete buildings. Table 3 shows the soil, concrete and steel models to analyze the behavior of the bridge by sap 2000. 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. Multiscale modeling of structural concrete performance is presented as a systematic knowledge base of coupled cementitious composites and structural mechanics. Comparison between researchoriented and professionaloriented structural analysis software, in order to identify analytical tools that satisfy both modeling precision and computational speed. Disclaimer all the opinions and statements expressed in the papers are on the responsibility of authors and are. In this contribution, a strainbased constitutive law for concrete within the framework of continuum damage mechanics is proposed.
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. The model simulating the test process was established, the calculation results of ansys are compared with the experimental results. For achieving durable structures in all phase of design, construction, use, inspection and maintenance adequate quality must be provided. Comparison of modeling methods of drilled shaft foundation. Nonlinear analysis of reinforced concrete threedimensional. The structural engineering community is increasingly using nonlinear static or dynamic analysis to evaluate the response of a structure subjected to seismic events. This paper discusses the modeling of reinforced concrete structural elements for use in geotechnical centrifuge modeling of soilstructure interaction problems. Homogeneous structural solid with simplified enhanced strain formulation is used to model steel plate for application of load. Analysis fundamentals 5 the eurocodes are based on the limit state approach in combination with a system of characteristic values and partial factors. Rigid body spring method is a useful analytical method to simulate discrete behavior like fracture. Nonlinear analysis of reinforced concrete threedimensional structures professors graham h. A threedimensional 3d model for finiteelement fe analysis of reinforced concrete rc based on smeared cracking approach is presented.
The techniques developed have become especially useful for the performance assessment of such structures under coupled mechanistic and environmental actions. Multi scale modeling of structural concrete k by randee. 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. Multiscale modeling of reinforced concrete structures. Multiscale modeling of structural concrete koichi maekawa. The finite element model is developed to accurately represent the geometrical configuration and dimensions of the test specimen mpz4. Introduction concrete is a composite material consisting of aggregate and mortar in mesoscopic level. Centrifuges are employed in geotechnical modeling so that the nonlinear constitutive behavior of soil in smallscale models can be correctly modeled at prototype scale. For both tests, a square concrete specimen with 300mm size was used, a quarter of which was modeled exploiting symmetry. The structural model development for ubol faulting is then discussed. 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. Development of a joint faulting model for unbonded. A secondorder integrity tensor is chosen as the internal damage variable to consider the phenomenon of loadinduced anisotropy.
Principles of durability design for concrete structures. Seismic behavior and modeling of reinforced concrete building columns. Durability design and quality assurance of major concrete. The constitutive model for plain concrete has been prese.
Modelbased simulation of reinforced concrete structures. Comprehensive coverage of durability of concrete at both material and structural levels, with design related issues. The model allows for the multiaxial simulation of predominantly tensile loaded plain concrete structures. An integrated computational scheme is proposed for lifespan simulation of reinforced concrete. They allow for improved quality control in the precast plants, and freedom in the architectural form of the members. 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. This paper mainly uses ansys, the finite element analysis software, to make nonlinear analysis of reinforced concrete beam. A novel multiscale approach for analysis of reinforced concrete structural elements that overcomes two major hurdles in utilization of multiscale technologies.
A sdvosb service disabled veteran owned small business. A single model element incorporates six global degrees of freedom, three of each located at the center of rigid top. Nonlinear analysis and constitutive models of reinforced concrete. 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.
In this paper, a mesoscale model of concrete is presented, which considers particles, matrix material and the interfacial transition zone itz as separate constituents. In mesoscopic level, concrete consists of mortar and aggregate. The modeling parameters to characterize the interlayer using data from the laboratory testing are also outlined. 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. For this, each participant will be provided with the structural analysis and design software sofistik which will be installed on the participants personal laptop.
Home usace technical letters index nonlinear, incremental structural analysis of massive concrete structures. The comparison shows that ansys analysis results are similar to experimental results, which indicates ansys analysis software can be used to. Janfeb 2014 principles of durability design for concrete structures mark g. 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. Newmark block model of seismic displacement of a slope. Nonlinear finite element analysis and postprocessing of. The results from the tests were used as the basis for the analysis where soil was modelled as 20node solid elements. Their combined citations are counted only for the first article. Seismic design aids for nonlinear analysis of reinforced. Doi link for multiscale modeling of structural concrete. Pointhingeorlumpedinelasticitymodels withphenomenologicalm. Many stressstrain models have been developed for fibrereinforced polymer frpconfined concrete. 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.
In this way, it is possible to quickly calculate alternative designs using different concrete strength classes or modified cross. The latter is accomplished by means of reduced order homogenization customized for structural elements. Concrete is a quasibrittle material and has highly. 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. In this paper some new formulations by adding deterioration processes in. Structural optimization of reinforced concrete spatial structures with different structural openings and forms. Flexural modeling of reinforced concrete walls model attributes. 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. May 10, 2011 in this contribution, a strainbased constitutive law for concrete within the framework of continuum damage mechanics is proposed.
Multiscale modeling of concrete and of the frpconcrete. The constitutive model for plain concrete has been presented and verified in a companion paper. Before being used for modeling the frpconcrete interface, the mesomechanical concrete model described in the previous section was tested under simple loading conditions, i. Nonlinear finite element analysis and modeling of a. Fullscale lateral loading tests were carried out on hollowprecastprestressed concrete piles embedded into the ground.
Concrete materials and structural integrity research unit. Flexural modeling of reinforced concrete walls model. The commonly used material models and modelling principles are briefly introduced followed by a handson training on the computer. Detailed threedimensional nonlinear hybrid simulation for the analysis of largescale reinforced concrete structures. 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. Models of soils, concrete and steel model soil concrete and steel. Evaluation of the fracture process in this level is useful to quantify concrete properties in macro level in which the concrete is assumed homogeneous. Nonlinear finite element analysis and modeling of a precast. It can also be adapted with other computational models to form a complete fully multiscale modeling framework, from nano to macro scale. The posttensioning pt strands were modeled as one solid cylinder with an equivalent diameter representing the total area of all pt strands. However, more sophisticated numerical models are available that incorporate coupled pmv behavior. The hybrid connection is modeled with dimensions and reinforcement details as illustrated in fig.
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. Modelling of concrete buildings for practical nonlinear seismic response analysis spreadovertherestofthelengthwithfurtherloading. His research interests include structural modeling, analysis, identification, and control. Structural engineers involved in analysis and design of concrete members and structures, students and academics. Concrete and reinforcing steel are considered to be two separate bodies, and bond is represented by the geometric contact of the two bodies. Principles of durability design for concrete structures mark g. Detailed threedimensional nonlinear hybrid simulation for the analysis of largescale reinforced concrete structures markou, george on. Analysisoriented stressstrain models for frpconfined concrete. Teng1, 1department of civil and structural engineering. A discussion of a paper with the aforementioned title by m.
Filippou graduate students vipul prakash and scott campbell department of civil engineering university of california, berkeley january 15, 1990july 15, 1991. Smallscale modeling of reinforced concrete structural. Algorithms are proposed to generate realistic particle configurations efficiently. Computer nonlinear analysis of reinforced concrete structures.
The building is residential and has a reinforced concrete frame structural system. Analysisoriented stressstrain models for frpconfined. Development of a joint faulting model for unbonded concrete. Multiscale modeling of structural concrete 1st edition. Numerical modelling and fullscale testing of concrete. Nonlinear analysis of reinforced concrete column with ansys. Links two active fields in materials science and structural engineering. 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. 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. 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. In most cases durability concerns the serviceability of structures. Practical application of fembased analysis, modelling and. When designing new buildings, structural engineers refer to asce 705 asce, 2005 for loads and analysis procedures. This includes the choice of modeling software and convergence and validation checks.
Modelbased simulation of reinforced concrete structures many reinforced concrete structures, e. 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. Yielding of shear connections in this wall may cause increase in energy dissipation, forming a structural damper that is based on structural passive control. Particles are represented as ellipsoides, generated according to a prescribed grading curve and placed randomly into the specimen. However, due to the problems complicated nature, there exists no commonly accepted methodology or a design code.
1163 868 55 1030 548 602 370 471 881 463 56 1092 1040 588 895 408 944 1407 290 646 1466 1507 1598 58 1294 56 896 89 1382 871