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  1. Today
  2. load modeling

    @ali7988 hameed.. I think you want to apply partition wall load on floor slab, for this purpose you can simply draw a null/negligible frame element and apply load over it.
  3. Yesterday
  4. load modeling

    Sorry, I m not sure what you meant. You don't need to include a member in the model just to add its load. You need to model only those members that are essential for completing the load path (structural members).
  5. Plate connection in compression and bending

    Looking at the figure, one cannot figure out the complete load path for a particular loading scenario. So, it is not possible to give a specific advice. But, the way these pipes are connected, there be moment due to the eccentricity of connections in addition to axial forces. In addition to axial and flexural stress, shear stresses can also dictate the thickness required for the pipe, if the load path includes these forces.
  6. RT @sariorabi: الروح إذ رفرفت.. لا تحتويها أيدي الغزاة.. تهبنا الحياة https://t.co/IsDyJFXAw5

  7. Assalamualaikum, Im designing a connection a pipe to pipe, between this pipe i have to add a plate to connect the pipe with welds. How can i determine the thickness of the pipe? Do i just design it based on tension load on the pipe? Cause my senior said that theres an eccentricity and i have to design it to resist such loads, but im not sure. Heres the figure of the drawing. Regards Groszni
  8. BEAM COLUMN CONNECTION LIMIT STATES

    do you calculate the dimension of the stiffner as a tension member by using these load-> required load for stiffener = force load by beam flage - column web resistance ?
  9. Last week
  10. hi all

    i have A question -please

    Can I model the load of partion load(brick wall load) by modeling a beam with very small dimensions such as 1 cm * cm

    and apply load on it (the small dimension beam).

     

    1. BAZ

      BAZ

      Sorry, I am not sure what you meant.

  11. Determine Bearing Capacity of Soil

    Please see these topics: http://www.eng-tips.com/viewthread.cfm?qid=347923 http://www.eng-tips.com/viewthread.cfm?qid=1734 Thanks.
  12. Final year project on base isolation

    W/s Imran, It is very hard to say if your FYP would help you in securing a job but one thing that is for sure, is that you will get skills like assessing an existing structure, doing base isolation and information about seismic codes and the response of a building to a seismic event - such skills would help you wherever you go. I am not aware of use of base isolators in Pakistan, there might be sensitive military installations where these are being used but I don't know if the market is really big for that and there is immediate need for people having that experience. But like I said above, you will get a skillset that any structural firm in Pakistan would value provided you do your project correct and develop understanding of what you are doing. Thanks.
  13. load modeling

    Can I model the load of partion load(brick wall load) by modeling a beam with very small dimensions such as 1 cm * cm
  14. Pile Design

    @UmarMakhzumi.. @Ayesha...Thank You for your concern. Yes we r on the same page . However my interest was only to highlight the fact that pile cap design is not like slab, due to pile spacing criteria and typical patterns, it will behave like a deep beam in almost every structure. However i feel there is no proper technical inputs on this component of structure and engineers follows whatever practices are in their offices. In this regard i would like to add little knowledge as per my experience , that unlike the normal slab, the critical sections for maximum FORCES will also be changed , it needs 5 to 6 special investigation as per the reference handbook mentioned in commentary of ACI. Regards
  15. Assigning Of Temperature Load In Etabs And Safe

    @ZOHAIB SATTAR NAGRA.. Applying temperature to vertical elements (Wall) will hardly effect your design, this is my observation. "It is pertinent to mention that biggest trouble for frames/walls will arise due to the application of temperature loading on slab area".
  16. Assigning Of Temperature Load In Etabs And Safe

    Thank you salman sb you have cleared alot of things and what I understand uptill now is (that there will come an extra reinforcement to balance the forces due to temperature in addition to seismic and gravity reinforcement) but I still have a question (what will happen to vertical shear walls directly facing sunlight?) what will happen if we apply temperature loading on these walls?axial stresses develop in wall?reinforcement?
  17. Assigning Of Temperature Load In Etabs And Safe

    @ZOHAIB SATTAR NAGRABefore replying to your question, I would like to clarify that I don’t know the plane of your building, you have big opening whose nature and geometry is unknown to me. Expansion joint might play an important role in your building, if there is abrupt change in the plan, I would recommend to provide expansion joint. In connection to your question, keeping in view the conditions of frame end conditions and heating of the building, briefly, I would like to explain as follows: 1. Intermediate floors will not be exposed to weather conditions; they will be much cooler than roof. Ask yourself what will happen if you will put this load on intermediate floors? Axial tensile or compressive stresses will be developed in your structure. SOLUTION: There will be no loading on intermediate floors at that time, except workers or temporarily loading, the reinforcement you already provided would be sufficient enough to cater theses build up stresses. Nothing will happen to your structure. 2. Your structure will act together, slab will not behave alone; in fact these volumetric changes will occur about Centre of Stiffness. Your frame will try to contract or expand as whole. Connection are not ideal rigid connection, the structure will have some relief from theses axial stress through joints, shrinkage/temperature steel and also through micro cracking which will not be visible.
  18. Assigning Of Temperature Load In Etabs And Safe

    @SALMAN CH my building is 227 ft x 170 ft with 60 ft x 60 ft opening in centre.as per ACI report 224.3 if diifference of annual mean temperature and maximum low or high temp (which ever is high ) is less than 20 C then we will give expension joint after 90m.but if it is greater than 60m then we will provide it after 60m. plz check image attached. plz explain third point I have a model file in office in which they have applied 27 degree only on roof .Why they have not applied it on buildiing exterior sides expose to climate like expterior columns and exterior beams and exterior walls on each story.? how to overcome the (axial load on beams) problem which you have explained in third point.? do we have to play with stiffness modifires? procedure?
  19. BEAM COLUMN CONNECTION LIMIT STATES

    Sorry by end plate I meant the plate that is connecting the beam web to the column. More specific checks for your case would also include: 1) The column web needs to take the force of M/d transferred by beam flange. The minimum thickness of the column web should be greater than wc >1.9*M/(db*dc*Fy) where dx is the depth of beam or column as per subscript. If the web thickness is not enough, the panel zone would require diagonal stiffener. The equation is based on Canadian Code S16. 2) Bearing resistance of column opposite to beam compression flange. If you do this check, you need not to provide any stiffener in the connection area if the checks passes. Thanks.
  20. BEAM COLUMN CONNECTION LIMIT STATES

    but i didnt use an end plate connection, the flange of the beam got welded to the flange of column, and the web of the column connects by double vertical connection plate attached/welded to column (fin plate i guess).
  21. BEAM COLUMN CONNECTION LIMIT STATES

    Groszni, What you did is good. You need to check the following as well: 1) Geometry Checks which include End Plate Thickness, Bolt Edge Min and Max Distances, Bolt Hole Pitch. 2) End Plate Tension and Block Shear along vertical line of bolts (You might have already checked it). 3) Check beam web shearing strength at weld. Hope that helps. Thanks.
  22. Pile Design

    I think you both are talking about the same thing. His statement is about ratio of slab thickness (h) to distance between piles (L) -> (h/L) being more than the code number and what you have referenced talks about distance between load points (L) to ratio of slab thickness (h) -> (L/h) which has to be less if the first statement is correct.
  23. Assigning Of Temperature Load In Etabs And Safe

    @ZOHAIB SATTAR NAGRA Application of temperature loading and provision of expansion joint depends on engineering judgment of an engineer, keeping in view construction tolerances.What is the length of your building, and how many storey it is? I would like to draw your attention to following comments You can ignore expansion joints till "60m" as per PCA suggestion, however it is not hard n fast criteria.Building Geometry also play an important role in provision of expansion joint. Please refer to ACI Committee report 224.3 Table 1.2. As far as Islamabad is concerned, basically when concrete is poured it generates heat of hydration, your concrete will not be at 5c when it will be poured it ll have some temperature. The structure will not be subjected to difference of 45 degree, it will actually be subjected to difference at the time of casting and mean temperature. Generally we take _+20 C. You can ignore temperature loading on intermediate floor and assign temperature loading to exposed roof surface. Sometimes the assignment of improper temperature loading would attract too much axial load on beams which will not happen in reality.Also concrete will try to relieve it with minor unnoticeable cracks
  24. BEAM COLUMN CONNECTION LIMIT STATES

    Assalamualaikum, im designing beam to column connection, i wanted to know what are some limit states on the beam and also on the column? and also i need a correction in my design, heres what i did : 1. designed the top and down flange groove weld to resist tension caused by Mu, Tu=Mu/(h-1/2tf.2) 2. designed amount of bolts on the web based on shear force 3. designed the connection plate on the web based on the shear force / axial (tension force) on the beam. 4. designed the fillet weld based on shear force acting on the beam what else i have to check/design? thank you regards.
  25. RT @Washiii_: نداء للأطباء: نناديكم من كوكس بازار - بنغلاديش، الأرض التي تضم أكبر مخيم لاجئين في العالم. نحن بحاجة لكم، لمساعدتكم، للأطباء…

  26. Assigning Of Temperature Load In Etabs And Safe

    For islamabad how much temperature (degree celcius) should I apply to my external members because in islamabad temperature varies from five degre in winter and upto 46 degree in summer.........also what if internal temperature (in rooms) is also not controlled then in this case we have to take temp affect on internal members also???
  27. Pile Design

    Dear Engr @UmarMakhzumi I just want to add something in it, I feel in this quote you wrote”MORE than require by code “by mistake, in simple words when the distance between supporting reactions is less than the twice depth of the member. I would like to add the ACI and AASHTO references in this regard. Thank You
  28. 50 cm Thick Raft Foundation over an Existing Retaining Walls

    engr @Ayesha there is an Empirical approach in ACI 14.5 which incorporates the slenderness of wall keeping in view the restrained conditions and then calculates its axial capacity. Although you might not agree to use 14.5 due to its limitation, however this is a good rough check. I am cautious about this wall because of the following reason: engr @Fatima Al Zahraa Olleik has mentioned its thickness is 0.4 to 0.25m, I suppose its top thickness is 0.25m and it is varying along the height. How you will support a 4-5 storey building load on a 25cm wall, I don’t know the type of load on building, I don’t know the crushing strength of existing structure; even she should verify bearing strength at the interface of column and wall. A wall with 25cm thickness supporting a high axial load can buckle like a thin column. This is my observation. From the sketch I feel column would be partially supported on raft and partially on wall, this is additional complexity in this project, and column looks like a peanut. I don’t know the seismic category of the building; I am of the view a high base shear may bring additional moment in the wall for which she should carefully verify the capacity of wall.
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