Modal combination method for earthquake-resistant design of tall structures to multidimensional excitations
Author: HONG-NAN LI, LI SUN1 AND GANGBING SONG | Size: 336 KB | Format:PDF | Quality:Unspecified | Publisher: HONG-NAN LI, LI SUN1 AND GANGBING SONG | Year: 2004 | pages: 19
This paper presents a modal combination method for earthquake-resistant design of structures to multidimensional
seismic excitations. With the assumption that an earthquake is a stationary random vibration, the correlation
among the input components is considered in the proposed method. The relationship coefficients between
the translational component and rotational component is then derived in the frequency domain. The combination
method of response spectrum for structural response to multidimensional earthquakes is proposed based on
the random vibration theory. With the help of the derived modal correlation coefficients, the formulation for
structural response to the two-dimensional earthquake excitations can be obtained. Numerical examples
demonstrate the effectiveness and high precision of the proposed methods.
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Implications of vertical mass modeling errors on 2D dynamic structural analysis
Author: TIMOTHY M. WHALEN, GRAHAM C. ARCHER AND KISHOR M. BHATIA | Size: 520 KB | Format:PDF | Quality:Unspecified | Publisher: TIMOTHY M. WHALEN, GRAHAM C. ARCHER AND KISHOR M. BHATIA | Year: 2004 | pages: 10
The use of diagonal (lumped) mass matrices is common in dynamic structural analysis. The assumptions made
when performing the lumping procedure, however, are not always consistent with the underlying physical behavior
and can therefore modify the dynamic properties of the modeled structure. The influence of errors in mass
modeling for vertical degrees of freedom on dynamic behavior and seismic response is illustrated. We demonstrate
that overestimation of the lumped masses associated with vertical displacements in 2D frame models of
these structures leads to inaccurate modal periods and associated modal participation factors for dynamic response.
The ramifications of these inaccuracies on seismic response are shown and implications in other dynamic analysis
situations are discussed.
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Dynamic analyses were carried out to study the seismic response of high-rise steel moment-resisting frames in
16-storey buildings. The frames are intentionally designed using three different design procedures: strengthcontrolled
design, strong column–weak beam controlled design, and drift-controlled design. The seismic performances
of the so-designed frames with vertical mass irregularities were discussed in view of drift ratio, plastic
hinge rotation, hysteretic energy input and stress demand. A demand curve of hysteretic energy inputs was also
presented with two earthquake levels in peak ground accelerations for a future design application.
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FLEXURAL STRENGTH–DUCTILITY PERFORMANCE OF FLANGED BEAM SECTIONS CAST OF HIGH-STRENGTH CONCRETE
Author: A. K. H. KWAN AND F. T. K. AU | Size: 257 KB | Format:PDF | Quality:Unspecified | Publisher: A. K. H. KWAN AND F. T. K. AU | Year: 2004 | pages: 15
Flanged sections are often used for long-span concrete beams to maximize their structural efficiency. However,
although for the same sectional area a flanged section could render a higher flexural strength, it would also lead
to a lower flexural ductility, especially when heavily reinforced. Thus, when evaluating the flexural performance
of a beam section, both the flexural strength and ductility need to be considered. In this study, the post-peak flexural
behaviour of flanged sections is evaluated by means of an analytical method that uses the actual stress–strain
curves of the materials and takes into account strain reversal of the tension reinforcement. From the numerical
results, the flexural strength–ductility performance of flanged sections is investigated by plotting the strength and
ductility that could be simultaneously achieved in the form of design graphs. It is found that (1) at the same
overall dimensions and with the same amount of reinforcement provided, a flanged section has lower flexural
ductility than a rectangular section; (2) at the same overall dimensions, a flanged section has inferior strength–
ductility performance compared to a rectangular section; and (3) at the same sectional area, a flanged section has
better strength–ductility performance compared to a rectangular section.
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Bentley AutoPIPE is a stand-alone computer aided engineering (CAE) program for calculation of piping stresses, flange analysis, pipe support design, and equipment nozzle loading analysis under static and dynamic loading conditions. In addition to 24 piping codes, AutoPIPE incorporates ASME, British Standard, API, NEMA, ANSI, ASCE, AISC, UBC, and WRC guidelines and design limits to provide a comprehensive analysis of the entire system. AutoPIPE is available for Windows XP/Vista and can be licensed across networks.
There are three versions of AutoPIPE: Standard, Plus, and Nuclear. The Plus version offers several advanced analysis capabilities not available in the Standard version which are detailed later in this chapter. The Nuclear version offers all of the features of the Plus version with the addition of all the features for ASME class 1 design. A KHK2 Add-On option is also available for the Plus or Nuclear version that allows use of the Japanese KHK Level 2 piping code in addition to all the features of the Plus or Nuclear version. AutoPIPE is a proven, well established program which has been commercially available since 1986. AutoPIPE’s rigorous quality assurance practices have withstood numerous on-site audits, making AutoPIPE one of the few PC based piping programs approved for use in nuclear safety applications.
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IMPORTANT NOTICE: You may use this software for evaluation purposes only.
If you like it, it is strongly suggested you buy it to support the developers.
By any means you may not use this software to make money or use it for commercial purpose.
Effect of structural characteristics distribution on strength demand and ductility reduction factor of MDOF systems considering soil-structure interaction
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Able2Extract PDF Converter is a commercial software for transferring PDF documents into formatted MS Excel, editable MS Word documents, PowerPoint Presentations, Autocad files, Open Office, image formats, HTML and more. Able2Extract Professional has additional feature of converting scanned and image PDFs to Excel, Word, and PowerPoint.
Able2Extract PDF Converter has a sleek and professional-looking user interface. Intuitive commands and navigational buttons reside at the top of the window. Novice users will especially appreciate the tips and the step-by-step guide it employs to walk you through the conversion process. The process was extremely easy and fast. Once we located our PDF, it was simply a matter of selecting the text we wanted to convert, and clicking on the file format icon on the toolbar. When we converted the PDF text to a Word file, we did have to clean it up a bit, removing a few extraneous lines and characters, but the text itself required no editing whatsoever. The program also has the capability to convert PDFs to HTML, Excel, and text files, which worked perfectly when we put them to the test. The Batch Conversion feature let us add multiple files to convert to the same file format in one fell swoop, a very handy tool for users handling numerous files.
4Shared:
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Notes:
1- Use this software with moderation as it is not freeware. If you like it, it is strongly suggested you buy it to support the developers.
2- This portable software wasn't developed by me. I found it on internet and i think is a good option to convert files.
3-Working/tested on Windows 7 32bits.
Adobe® Creative Suite® 6 Master Collection software delivers unprecedented performance with blazing-fast 64-bit native support and GPU acceleration. Groundbreaking new creative tools provide innovative ways to design for the latest devices. With exceptional power and precision, you can create inspiring experiences.
What's inside:
Acrobat X Pro
Adobe Audition CS6
Adobe Premiere Pro CS6
After Effects CS6
Bridge CS6
Dreamweaver CS6
Encore CS6
Fireworks CS6
Flash Builder 4.6 Premium Edition
Flash Professional CS6
Illustrator CS6
InDesign CS6
Media Encoder CS6
Photoshop CS6 Extended
Prelude™ CS6
SpeedGrade™ CS6
System Requirements:
* Multicore Intel processor with 64-bit support
* Mac OS X v10.6.8 or v10.7
* 4GB of RAM (8GB recommended)
* 15.5GB of available hard-disk space for installation; additional free space required during installation (cannot install on a volume that uses a case-sensitive file system or on removable flash storage devices)
* Additional disk space required for disk cache, preview files, and other working files (10GB recommended)
* 1280x900 display with 16-bit color and 512MB of VRAM; 1680x1050 display required and second professionally calibrated viewing display recommended for Adobe SpeedGrade
* OpenGL 2.0–capable system
* DVD-ROM drive compatible with dual-layer DVDs (SuperDrive for burning DVDs; Blu-ray burner for creating Blu-ray Disc media)
* Java Runtime Environment 1.6
* Eclipse 3.7 Cocoa version (for plug-in installation of Adobe Flash Builder; the following distributions are supported: Eclipse IDE for Java EE and Java Developers, Eclipse Classic, Eclipse for PHP Developers
* QuickTime 7.6.6 software required for QuickTime features, multimedia, and HTML5 media playback
* Dedicated GPU card recommended (for optimal performance in SpeedGrade and for GPU-accelerated features in Adobe Premiere Pro and After Effects: NVIDIA Quadro 4000 or other Adobe-certified GPU card with at least 1GB of VRAM recommended)
* Optional: Tangent CP200 family or Tangent Wave control surface for SpeedGrade
* Optional: 7200 RPM hard drive (multiple fast disk drives, preferably RAID 0 configured, recommended) for video products
* This software will not operate without activation. Broadband Internet connection and registration are required for software activation, validation of subscriptions, and access to online services.† Phone activation is not available.
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