Sorry bro. A little correction here. Compressive strength and tensile strength is two totally different thing. Tensile test is carried out for steel materials such as rebar, I-beam, Steel pipe casing etc. It is a "pulling" test so that we can know how much is the yield strength and tensile strength before failure.

Lets say we are going to construct a single storey building. Inside the columns, the designers will on use the minimum amount of steel as per the BS's requirement. This is because the column does not have to resist much moment. Heck, you don't really need rebar for single storey columns. Some people even used bricks for their columns and there are no issues as long as the foundation is stable. My senior engineer once said the only time that the rebar will come to work is when there is a crack in your column which is wide enough for you to see your rebar. Otherwise, your structure will rely on your concrete's compressive strength only. That is why for bigger and heavier structures, we specify higher concrete grades. At the same time, it will also reduce the amount of required steel area. Hence please dont just add or use bigger rebars when the specified sizes are unavailable. There is a limit too.

You can also think of it this way. Why rebars are allowed to use lappings for extensions. If it is used to handle compression such as normal steel structure (H-Sections), lapping is definitely not acceptable. Imagine it sliding down because it is tied together with a wire only. The reason lapping is adequate because we only need them for their tensile strength to resist moment. You will also never see a steel structure being built by using rebars. All of them are built using proper structural steels which have enough strength to resist buckling during compression. Rebars are too slender, hence it will buckle easily. It can be used as bracing to prevent the steel structures from buckling though.

with IBS and well planning, the superstructure of 30 storey can be complete is just 15 days. (of course, the substructure aka foundation work have to be complete first)

those are crane operator. no idea whether they need licence to drive those equipment or not. should need ba. all these while just order directly from machinery renting company. those machinery renting company will rent the machine inclusive of operator.

i see, one day I wanna learn how to drive big cranes they're just so badasss

what?

I know what is compressive strength and tensile strength. they are different. example when u bend a eraser with bulging on top, tensile force occur at the top and compressive force occur at the bottom.

all these while I only do high rise building hence not encounter much on those landed property. what I mean is steel have higher compressive strength than concrete in term of their properties. if u are engineer u will know what I mean below.

for a beam, let's say the compressive stress is not achieve, then engineer will add top bar at beam. so that it will increase the compressive strength of the beam when load applied on top of the beam. steel is expensive material and hence like u say, they try to use as minimum as possible for steel so that it can help client to save cost which is also client's needs in having more profit. for competent client, they will check the ratio of steel to concrete so they know which engineer over design and hence they will eliminate on using those engineers as those engineer over design to ensure the building is safe instead of use minimum amount of steel that save client development cost.

operator quite high wages also. anyway is dangerous la. there are incident like their head is chopped when operate forklift.

I have a crush on my housemate. He's studying degree in construction management.
How do I get his heart easily?

The compressive strength for steel is too high. That is why we never even measured their strength. I bet the compressive machine will fail first if you try to compress a steel plate or cube. The reason we add rebar into concrete beams is to reinforce them. Hence the reason why we called them reinforced concrete. The concrete here is the main character and the rebar is just the support. We also never measure the yield strength of the concrete because it will fail almost immediately when pulled (Very low tensile strength) and that is the reason why we add rebars into concrete. For beams, when subjected to dead loads and live loads, it will bend downwards. However, the concrete's strength is from compression. If bending, then it will crack and thus the reason why we add rebars. To enhance the tensile strength of the concrete.

Furthermore, you need to check on which load combinations that your beam failed. During uplift or normal combinations? This is because adding rebars for top part of beam does not help much if the beam is facing downwards force. Furthermore it will only congest the top part of the beam and makes it harder for the concretor and probably end up with a beam full of honeycombs.

However, back to rebars, you can eliminate the need for rebars in your concrete products IF your concrete has enough ductility. One of the latest products are Ultra high performance ductile concrete (UHPDC). Recently went to their seminar and was very impressed by this technology. They manage to make their concrete ductile and hence eliminating the needs for any rebar. Furthermore, the concrete strength is also increased by a lot and hence can be stressed further. Very ideal for long span prestressed bridge. You can read about it here. http://www.dura.com.my/uhpc/dura-uhpdc

Btw, you are a QS right?

This post has been edited by vxv: Oct 23 2014, 01:36 PM

1) correct procedure wise, yes u have to. but most people didn't do it la. and I think using gypsum board would be easier. in case u wanna sell the house and the buyer insist u to remove the wall, gypsum wall is easy to dismantle and dispose compared to brickwall

2) procedure wise, yes, u have to. those runner competent engineer can help u do all, like one stop center like that do everything. of course if that is loadbearing wall, then u can't do anything as break down that wall will cause the entire house collapse. if condominium then it's even harder as management office will never allow that.

I come across a lot of new technology that tried to introduced here in Malaysia. most of them hardly penetrate through the market as here still resistant to change. client usually not confident on new thing and want to be safe. and second if ur new technology cause more cost than original traditional method, they don't feel like it's worth it to change.

I'm nobody

anyway I see all these in the perspective view of engineer, QS, architect and client. all have different concern.

I had applied engineer post as safety officer in construction. The manager require a lady as they are very typical type and can manage work properly.
However, they arent willing to adjust flexi time due to me, as a mother, need to send kids to school and nursery.

PLus working time also longer compare to manufacturing company.

pLus, the bangla worker there, keep on staring at me eventhough i'm dress in jeans and wide tshirt. (I am abit boyish type)

goes to 2nd interview, the project manager, said" wow! good and nice!"
I was like huh??!

then I asked him, he said my body figure nice. wtf^&%^.

i write my expected salary, normal as market, 30% higher than my current.

the project manager, said "Is too overprice". and again wtf*&^&%&^

the next day, next week, next month, and now, next year... No news at all..

Conclusion, waste my time travelling to the site and attend twice for interview on weekend.

ya, woman not advisable to work at site la. definitely lot pipu will stare at u. construction site pipu like to talk dark humour as if it is normal. if can avoid better avoid that la. u got green book?

got. thats whhy there cant even pay for 5k for a 6 yrs experience(3 yrs fresh + after 3 yrs with green book). the tauke Still want to try to demand lower.

ic. very high demand safety officer. why not try oil and gas?

Try this!

M+W High Tech Projects Malaysia Sdn Bhd
20th Floor, Unit A, Gurney Tower
No 18 Persiaran Gurney
10250 Penang, Malaysia
Phone +604-370-4500
Fax +604-370-4510

Or this:

Lead Management Engineering (Malaysia) Sdn Bhd
No. 124/125 Jalan Persiaran 6,
Kulim Avenue, Kulim Hi Tech Park,
09000 Kulim, Kedah
Tel: +604 410 2128
Fax: +604 484 6902

Should be able to command your expected salary.

For tower crane, u need to go through jkkp to get license
For mobile crane, u need driving license for lorry class, and jkkp for operate crane.. Those heavy equipment need jkkp license.. Fyi jkkp in English dosh

is this company good?

The company thst I work is looking for Facade Engineer as permanent employer. Do you all guys got anybody for introdution?

BlueScope Lysaght?