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التصميم و البناء في الهندسة المدنية Performance Based Design by CSI

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PDFN التصميم و البناء في الهندسة المدنية Performance Based Design by CSI

مُساهمة من طرف ING_Adjoint في السبت ديسمبر 26, 2015 2:16 pm

Performance-based design is a major shift from traditional structural design concepts and represents the future of earthquake engineering. The procedure provides a method for determining acceptable levels of earthquake damage. Also, it is based on the recognition that yielding does not constitute failure and that preplanned yielding of certain members of a structure during an earthquake can actually help to save the rest of the structure. In this technology-packed seminar, Ashraf will present the theory and practical application of nonlinear analysis and performance-based design in terms and analogies that are very familiar to the practicing structural engineer. Attendees will leave the seminar empowered with a clear understanding of this new technology.

The seminar will address many fundamental questions, such as:


  • Why do we even need to talk about nonlinear analysis?
  • What is really meant by energy dissipation and why it is important?
  • What is a time-energy diagram and why is it so important in seismic design?
  • What is deformation capacity and why it is more important than strength capacity?
  • What we really mean by ductility and why strength without ductility is useless?
  • What is a material model, a fiber model and a hysteresis loop?

And, elaborate on many interesting observations, for example:


  • ... that structures can be designed to follow predefined paths of damage to preserve critical components.
  • ... that allowing yielding of parts of a structure during an earthquake can save the rest of the structure.
  • ... that yielding does not mean failure and some structures can have more strength after yielding.
  • ... that the most efficient and accurate nonlinear time history analysis technique is based on mode superposition.
  • ... that most dead load analyses assume that a structure is built weightless and gravity appears instantaneously.
  • ... that a nonlinear time history analysis is important even for a regular high rise structure.

Nonlinear Theory


  • Material and geometric nonlinearity
  • Steel and Concrete behavior in the nonlinear range
  • P-delta and large displacements
  • Yielding and energy dissipation
  • History dependence
  • Ductile and brittle behavior
  • Ductile limit and strength loss
  • Elastic and plastic energy
  • Cyclic stiffness and strength degradation, and fatigue
  • Hysteresis loops and time-energy diagrams


  • Redundancy and resilience
  • Strength based design and deformation based design
  • Problems of design by analysis
  • Capacity design and sacrificial elements
  • Collapse mechanisms
  • Sustained and cyclic loads

Nonlinear Modeling


  • Material models, moment, axial and shear hinges FEMA hinges
  • Rusty hinge model
  • Moment axial force interaction
  • Fiber hinge models for complex shapes
  • Multi layered nonlinear shell model
  • Multi linear elastic and plastic behavior
  • Viscous dampers
  • Base isolation energy dissipating models
  • Types of hysteresis loops - kinetic, isotropic, Takeda and pivot
  • Special considerations for tall building

Nonlinear Analysis Techniques & Performance Based Design


  • The FNA time history analysis method and the power of Ritz vectors
  • Step by step nonlinear time history analysis
  • Large-displacement and P-delta effects
  • Modal and Rayleigh damping
  • Nonlinear events and element state determination
  • Unloading events, redistribution and solution complications
  • Requirements of ASCE41Pushover analysis and limitations
  • Force controlled loading and displacement controlled loading
  • Badly behaved displacements (snap-back and snap-through)
  • Non-uniqueness of static solutions, uniqueness of dynamics
  • Acceleration Displacement Response Spectrum (ADRS)
  • Push over curve and target displacement Equivalent linearization and displacement modification methods
  • Performance measures and performance levels
  • Demand/capacity ratio and acceptance criteria
  • Soil-structure interaction

Nonlinear Applications in Structural Engineering


  • Buckling restrained braces
  • Eccentrically braced systems
  • Base isolation systems
  • Reduced beam sections
  • Panel zone plasticity
  • Foundation uplift and structural pounding
  • Long term creep and shrinkage
  • Effects of construction sequence loading
  • Nonlinear dampers and deflection control
  • Tension only bracing systems
  • Cable supported structures

Details
Size: 500 MB
Language: English
Format: .PDF, .PPT, .MP4
Author:   Ashraf Habibullah (Founder, CEO of CSI Inc.)


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    الوقت/التاريخ الآن هو الأحد أكتوبر 22, 2017 3:40 am