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- 1970-1-1
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发表于 2003-8-11 21:51:50
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来自 上海
回复: 回复: 【转帖】回复傲雪论坛:Adina 8.0.7 的三个安装选项有什么不同?
changqing wrote:
Diana和Adina为两个不同的软件,听说Diana做岩土很好,但是一直无缘一见,不知哪位大虾能详细介绍一下?
没人说他们两个是一样的阿.
DIANA is an extensive multi-purpose finite element system, used to analyse a variety of technical problems arising in a wide range of technical disciplines. Problem types related to the analysis of concrete and concrete structures are for example:
Failure and post-failure behaviour of reinforced, pre- and post-tensioned concrete structures
Analysis of temperature development and collapse of concrete wall due to fire load
Deformation of sub-soil tunnel segments
Calculation of reinforcement stresses during design stages
Time-dependent deformations in bridge engineering
Dynamic behaviour of off-shore platform due to an earthquake
Heat production due to cement hydration
Lines and planes of influence for railway bridges
ELEMENTS
DIANA offers an extensive assortment of straight and curved elements, so the user can choose the element type that is most suitable for his problem.
Stress elements
Stress elements are used to analyse the load-deformation behaviour of structures.
truss elements (discrete reinforcement elements)
beam elements
plane-stress elements
plain-strain elements
axi-symmetric elements
3D solid elements
plate and shell elements
interface elements
spring elements
Flow Elements
Flow elements are used for heat analysis or concentration analysis.
2D/3D elements
boundary elements
cool pipe elements
REINFORCEMENT
Reinforcement and prestressed cables can be modelled with separate truss elements or embedded reinforcements. The embedded reinforcements are positioned within "mother" elements and can be modelled easily and quickly by using the built-in reinforcement location preprocessor.
separate truss elements in combination with interface elements for describing bond-slip behaviour (linear, multilinear and nonlinear bond traction-slip curves)
embedded reinforcement
bars in 1D, 2D and 3D elements
straight or curved
pre-tensioned and post-tensioned concrete
no bonding and perfect bonding (may be switched on and off during nonlinear analysis)
uniform and nonuniform prestress
reduction of prestress due to:
retention of anchor(s)
friction
wobble
CRACK MODELS
DIANA offers smeared and discrete models for the analysis of cracks and joints in concrete and similar brittle materials such as rock and masonry.
smeared cracking for distributed crack patterns
tension cut-off conditions
various tensile softening diagrams (linear, multilinear and nonlinear)
non-orthogonal, multi-directional smeared cracking
constant and crack-width-dependent shear retention models
unloading, closing and re-opening of cracks
secant and consistent crack normal stiffness
fixed and rotating crack concepts
decomposed and total strain models
discrete cracking in interface elements for localized cracks
various tensile softening diagrams (linear, multilinear and nonlinear)
crack dilatancy models
unloading/reloading model (secant, elastic, cyclic model Hordijk and Reinhardt)
PLASTICITY MODELS
A considerable number of constitutive models can be used for stress-strain behaviour. Plasticity models can be used for both generic stress elements and embedded reinforcements.
Tresca, von Mises, Mohr-Coulomb, Drucker-Prager yield criteria
Tsai-Hill and Hofmann yield criteria for orthotropic plasticity
associated and non-associated plasticity
hardening and softening
plastic dilatancy
temperature influence on yielding
second order tangent stiffness for fast convergence
cap model for crushing concrete
TEMPERATURE DEPENDENCE
The material properties of stress elements can be temperature dependent. For both concrete and reinforcements the Young's modulus, Poisson ratio, thermal expansion coefficient and yield properties can be temperature dependent.
CONCENTRATION DEPENDENCE
The following material properties of stress elements can be concentration dependent: Young's modulus, Poisson ratio, concentration expansion coefficient.
CREEP
A special model is available for thermal creep of concrete at elevated temperatures. Two viscoelastic models are available for modeling of creep of concrete.
Power law
Maxwell chain, optionally including ageing and/or temperature dependence
translation of CEB-FIP Model Code 90 and ACI to a Maxwell chain model
SHRINKAGE
A shrinkage model allows the user to take into account concrete shrinkage according to the CEB-FIP Model Code 90 and ACI initial strain formulation.
INTERFACE MODELS
Special elements and models are available for the analysis of interface behaviour between different parts of a structure or the surrounding, for example joints, cracks and shear planes.
discrete cracking
bond-slip behaviour
gap formation
associated and non-associated Coulomb friction
nonlinear elastic models (beddings)
COMBINATION OF NONLINEAR MODELS
Throughout the development of DIANA, special attention has been given to the possibility of combining various non-linear phenomena.
temperature dependence, cracking, plasticity and transient creep
temperature dependence, cracking and viscoelasticity
geometrical (total and Updated Langrange) and physical nonlinearities
continuum and interface nonlinearities
SOLUTION PROCEDURES
To solve the system of equilibrium equations, DIANA provides a direct solution procedure and different types of iterative solution procedures (Conjugate Gradient Method, Generalized Minimal Residual Method). For the control of nonlinear analyses several iteration schemes, self-adaptive loading algorithms and convergence criteria can be used.
linear stiffness, constant stiffness, Modified Newton-Raphson, Regular Newton-Raphson, Secant stiffness (BFGS, Broyden, Crisfield)
arc length control (linearized and quadratic), load control, displacement control
automatic load control (constant energy increments, number of iterations)
automatic loading/unloading
continuation method
eigenvalue checks
non-symmetric solvers for non-associated plasticity
convergence criteria: force, displacement, energy
stop criteria: total load, incremental load, sign change of load vector
INITIAL CONDITIONS
The stress situation of the structure can be important as a starting condition for a nonlinear calculation. These stresses can be introduced into the model as:
initial (pre)stress as input
initial stress as a result of linear analysis
DYNAMIC ANALYSIS
DIANA provides the ability to analyse the dynamic behaviour of concrete structures.
Types of dynamic analyses:
eigenvalue analysis
steady state analysis
mode super position technique (modal analysis)
direct solution technique
transient analysis
linear elastic and nonlinear
Types of loadings:
periodic loading (for a steady state analysis)
force excitation
base excitation (earthquake)
short term loading (time-load diagram)
stochastic loading
Davenport spectrum (wind load)
Pierson-Moskowitz spectrum (wave load)
Jonswap spectrum (wave load)
THERMAL ANALYSIS
DIANA contains facilities for performing steady and/or transient potential flow calculations.
heat production and cooling of concrete due to cement hydration
convection/radiation, capacity/enthalpy and conductivity can depend on the degree of hydration, temperature and time.
A heat analysis can be combined with a static structural analysis to analyse the mechanical effects of temperature load on all kinds of structures.
translation of results of thermal analysis to structural analysis
structural analysis; linear/nonlinear
PHASED ANALYSIS
The erection of concrete structures involves a number of building stages. The execution history affects the final deformations and stress situation. Phased analysis is used for an accurate modelling of the execution history and can be combined with a nonlinear analysis.
addition/removal of elements during analysis
addition/removal of reinforcements and prestress during analysis
addition/removal of supports and tyings during analysis
USER SUPPLIED SUBROUTINES
By using user supplied subroutines, end-users have the opportunity to supply Fortran code of predefined subroutines. User supplied subroutines, interesting for the analysis of concrete structures are:
hardening function
creep-law
PRE- AND POSTPROCESSING
The coupling with interactive mesh generators and graphical postprocessing programs completes the service of DIANA.
mesh generation
graphic facilities, including plotting of force and moment diagrams, reinforcement forces, lines and planes of influence, crack patterns, total deformations, incremental deformations, stresses, plastic points, etc.
neutral file for coupling with external pre- and postprocessors such as DISPLAY III FEMGEN/FEMVIEW, Patran or IDEAS. |
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