Hi,
Refer the image.
Now I am following image 01.
1. But i want follow Image 02 to reduce the concrete and steel.
2.If i choose image 03, as per my project lintel are designed to carry 4m blockwork.
so that location can i ignore the midbeam?
I need technical explanation for this issue which one is better?
Thanks
kalai
All three options work; however;
Ideally, work with Image one and size the lintel properly
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From my point of view option 1 is the best but with some adjustments.
I would go for precast smaller lintel that can be added later. in that case, you will cast the columns and beams with one connection only. that's more practical for site.
1- cast columns to the bottom of main beam.
2-cast the main horizontal beam.
3- continue with the columns.
4- add the precast beams supported on steel angels for example which will be anchored to the columns.
check below photo.
another option would be to move the columns away from the door in your design then do same steps 1 to 3. and then add the lintel directly on the block right and left of the doors.
check below photo
sometimes being very economic would not be practical for site . but technically all your options are ok.
Mostafa Elashmawy
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Thanks.
And what will happen if i choose image 3 ?
(in this case we have tolerance also.
lintel design wise safe to carry that much block work.)
Technically speaking it is preferably work with option 1 and resize the Lintel (h=20 is more than sufficient) which can be pre-casted and fixed on steel angles as @MostafaElashmawy suggested, or it can even be steel lintel in this case … Execution wise this is faster considering that the concrete (columns/beams) is casted 1 step less and overall, this option saves you more on both the time and cost.
Width wise, it is better to fix subframes on concrete than on blockwork, so you should be fine if you consider for "Door structural width + Xcm" depending on whether such doors have a necked or flush frames / with or without subframes
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