Lintel Arching effect interupted? 2

[mar2805]

HI guys.
This is my First time caclulating a amasonry structure and Ive been reading a lot of topics on this matter but few things are not clear to me.
If you look at the picture attach:
Imaginary arching triangle is intrupted by a RC floorslab (green line).
Should I still provide the traingle load from wall Dead weight or should I take full rectangular block from the lintel top side to the top side of the slab + tringular shape from the top side of the slab ?

 

[mar2805]

@dhenger
Are you talking aboth loads on window lintels that I didnt draw in previous sketch couse you got me realy scared now?!
Have I missed something?
I didnt say in my previous post anything aboth this, but I just draw the load coming from window lintels.
This is now (hopefully) THE COMPLETE LOAD SCENARIO....
and guys, please do post your sketches couse its much easier sometimes to solve problems.

 

[JLNJ]

It looks to me that you just have 350 cm tributary length from the walls, floor, and roof, and you apply it as a uniform load to your lintel at the lower level.

Then you go talk to the architect because you need a very deep lintel. You might even need to beg for a pier on each end because the bearing stress will be very high.

You might have shear problems with the design of the lintel and you will comtemplate a higher f'm or maybe shear reinforcement. Or a steel lintel (if permitted by fire code).

Then you look up the mechanical guys and tell them they are not permitted to run duct or piping through this important lintel. Murphy's law says that this is where the HVAC header needs to go.

Then you get with the electrical group and inform them that, no, it's not OK to cut a slot through this lintel for cable tray.

Lastly you will need to make sure the control joints are as far as you can get them from the lintel jambs to maximize your bearing length.

 

[tony1851]

@mar,

FWIW, assuming the brickwork is sound or new, and putting aside the books for the moment, I would have just taken the whole loading within the red line on the attached sketch - walls, slabs and roof - job done. It wouldn't be that far out - I might have missed some (small) loads, but have probably added some in as well.

Look at it from a practical viewpoint; if the beam sheared off completely at both bearings, gut feeling says it's highly unlikely the whole facade would drop down by the span of the beam.

 

[mar2805]

Thank you all for the assistance.