Tuesday, April 29, 2008

Hyper

it is another hectic and busy day...
i was working... and my heat beat goes, faster... faster... and FASTER!
at some rate i thought my heart is going to burst out from my body.
i think i am getting hyper again during work!!!

Friday, April 25, 2008

The study on the Engineering Softwares - Cedrus (CUBUS)


4. Cedrus - CUBUS



Cedrus - CUBUS is not a popular engineering software in Malaysia. i bet 9 out of 10 engineers in Malaysia have not heard about this software. however, its function is as complex as RAM PT (another software which does Prestressed Design in 3D and 2 direction)

things that Cedrus can do is amazing. however, it only suits the purpose of higher analysis, such as:
  • irregular Floor plan design
  • transfer slab
  • flat slab (PT)
a lot of commands for Cedrus whereby i find it amazing and unique. Besides the very popular command of importing CAD drawings to your model space, it also separates the layers of lines you have imported. The imported lines serves as dummies to your model, and can be turn on/off easily.

Cedrus also exports floor to floor loading, from the reactions of the supports. Therefore step construction is easy to be carried out. For the complexity and not so regular of your building layout, it can cut section at anywhere and integrate the reactions (Moments, Shear, Stresses, Deflections etc.) where u desired.

One thing i find it quite annoying with Cedrus is that the beam elements it the model cannot overlap. Cedrus separates Beam and Slab elements very transparently. When you have a Beam element in the model, the stiffness of the beam will attract more moments as compared to your slab element.

Also, you have to make sure that your model is in complete order before you execute the analysis. The user has to be very organized and tidy when modeling the layout. A minor mistake will thus cause you to spend more time searching for the mistake and trying to rectify the problems.

Another key feature of Cedrus is the capability to model Prestressed Tendons in 2 Direction (meaning 2 way action) instead of you normal 1 way design. Its easy handling of the tendons by just setting the high/low point of the profile ease your work.

Overall, Cedrus is most suitable for advanced analysis.


The study on the Engineering Softwares - RAPT

3.RAPT

RAPT is by far the most reliable design software (local elements) i've encountered. it can only do continuous Beam Design (Reinforced Concrete and Prestressed Concrete), as well as Column design. because of its simplicity of function (only elements design), therefore it is stable, and easy to manage. I truly admire the function of its detail layout, especially when it comes to Prestressed beams. it clearly shows the profile of your Prestressed tendons as well as the variation of your beam dimensions (drops or changes of section).

Although RAPT prepares very detail calculations report, it however doesn't create CAD drawings. thus this will disappoint most of the ciplak 1 cent consultant since it cannot save the cost of your draughtsman/draughtswoman.

However, you HAVE to appreciate the RAPT when it comes to prestressed design. The details point to point profile and also its calculated stresses should be appreciated. Also, when it comes to complex beam sections or load cases, you will truly admire RAPT. It allows you to modify the beam section point to point and also your desired design sections.

Overall, RAPT is a very stable software, the model file rarely corrupts, and it is clear and easy to handle. Only bigger consultants will appreciate the luxury of RAPT.

The study on the Engineering Softwares - StaadPro2006

2. Staadpro2006

StaadPro is a very powerful tool for both Local and Global structural analysis. it can perform Finite Element Analaysis (FEA), modeling a plate, roof trusses, a globe, and it also can do Bridge Design.

One thing i like about this software is that it has various type of predefined model in the structure wizard. so one click away from your very typical model, and you will be in business. it can also perform various design such as concrete and steel.

Although having the ability to import CAD drawings, when it comes to managing the lines where you have imported from the CAD drawings, i found it quite helpless. You will import a lot of dummy lines to your model space, undefined and unwanted. This thus will cause you to have more time deleting and tidying up your model instead of getting what you want. This also reviewed the fact where it is harder to control the model in staadpro under different angles and different floors. When it comes to controlling the model, ETABS still crown the best.

Many does not know that Staadpro DO exports CAD drawings (in detail). after you have completed your analysis and design, you can actually create the detail drawings (in .dxf format). For an example, you have design a 3 span RC beam. The profile of the 3 span beam as well as the reinforcement layout of the beams, lapping details can be created by the software itself.

the older version Staad2000 has some problems with bugs therefore your model will be automatically shut down if there is any errors. you have to constantly save your model (manually) or else if it is your UNLUCKY day... all changes before last saving will be totally wiped out. however, things improved when it comes to StaadPro2006 as the Auto Saving command will keep your work secured. not very sure about StaadPro2007 as but i presumed it is better.

Overall, it is a worth buying software for the medium based consultant. The software is stable, powerful for structural analysis, and the model file will not corrupt easily.


Sunday, April 13, 2008

The study on the Engineering Softwares - ETABS

this will be a series of posts where i will give out my comments about the listed design structural softwares where i utilize on my daily basis. besides locating the pro and cons of the software, i will also cover the function and my experiences with these softwares.

1. ETABS (Extended Three Dimensional Building System)

this is a frequent software i use in work. throughout my experience with this software, i found it quite stable. i have never experience any difficulties, nor encounter any bugs with this software, except for once but i managed to copy the whole model and paste it in a new file. The Model HARDLY corrupts. No problem dealing with this one at all.

As its name implies, this software is mainly for Building System. it is one of the most popular software in the United States, and i believe so in worldwide. It is very powerful for Global analysis, and suitable for advanced analysis such as Lateral (Wind and Seismic Analysis). It can import CAD files in .dxf format to allow you to model your structure easily. but it is advised to create your own grid line to build up your model. Very user friendly, divides every floor on a separated plan making it easier for user to handle the modifications of the model. Also Capable of viewing the model in every single angle.

Although ETABS performs complicated analysis, however it can only give you output like Moment, Shear, Deflection etc. It can perform design (concrete, steel & composite), and provide calculation details, it however does not export detail CAD drawings (in .dxf format). Therefore, only big consultants who has big building jobs which requires advanced analysis would be more favor to this software. dont expect a ciplak 1 cent 1 man show consultant to perform a lateral analysis using this complicated software.


Saturday, April 12, 2008

Busy Days

i never thought blogging would be such taxing...

but nvm... recently i have a little problem about blogging, and my busy schedule has kept me away from it. and also some accident occurred...

but nvm all the pain, now it is back to order. had a few days off from office. and by the time i return, all the stuffs has piled up. and that is really bad. i am currently under 4+1 job, the reason why i wrote 4+1 instead of 5 is because the 1 is still not confirmed job yet. but i still need to work for it.

and then... so much of Xtra work unofficially. giving advise to someone, and working hard on other similiar design jobs as well. One thing i dont really feel happy about being a structural engineer is that you need to work everything from scratch til the end. and the process is not straight to the end. u have so SO SOOOOO much amendments until sometimes u feel helpless (those under the same situation will understand). but whether u like it or not, this is the way how this profession earn a living. No Pain No Gain!

but the recent popularity of the developed softwares have ease our work so much until we're depending for it completely...

haha... i shall return for some interesting stories about softwares i've been using all the time!


Friday, March 28, 2008

Jokes of the day I

Too much silly stories i heard from this industry. Too silly too ridiculous you will never believe what i am writing now...

- capacity: 2000kN, design load: 60kN ---> overdesigned? 30times!!

- submit calculations for authority approval ---> my computer kena virus (infected by virus), i cant print out the calculations!!
err... what about writing down the procedures, design and analysis on the calculation sheet? do you know how to do hand calculations, without using the computer? i mean... do u know how to use the calculator? or... do u know what u are doing?

- Senior professional talking to Junior / sub-professional: 'why not we get someone more experience to set up the layout?' (before he continues the design)
*akhem* aren't you supposed to lead the job and set up the layout? because... you are Senior and i am junior/sub professional.... u know...

- OMG we have a deadline to catch, we need to issue the drawings!!!
emm... what is our scope of work? what are the drawings we need to issue?

- We design the pile cap to NOT to take any Moment since we already design all column at each level to be pinned at both ends, so there will be no Moment induced to the pile cap!
pinned column at both ends? every floor? then ur building will look like....

- slab (150mm); perimeter beams (b=150mm, h=150mm)
.... .... .... Contractor: 'how to crank in the bars?' etc etc

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so much for today... i shall return someday with more jokes!