EngrUzair

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EngrUzair last won the day on February 12

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About EngrUzair

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    engruzair@yahoo.com

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    Male
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    Rawalpindi
  • University
    MSU USA & UET Taxila
  • Interests
    Structural loading, RC design, Steel design, Fire damaged structures, Structural evaluation & rehabilitation

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  1. AA! Dear Engineers, 1. What is the design life of an RC structure according to various international codes? Please refer to specific section of the code, if possible. 2.. What about design life of RC structures, being designed & constructed as per present practice in Pakistan? Is it mentioned somewhere? In it is not specified, then whether it should be same as recommended in international codes, or.........? Please discuss & give your recommendations as well. Regards.
  2. Dear Umar! Can you refer to the specific sections of different building codes, along with Design Life indicated therein? Regards.
  3. What was the cause of the problem? Please share for the information of others. Regards.
  4. Above referred site is related to Concrete Masonry. Following site may be helpful in connection with Clay Brick masonry:- http://www.gobrick.com/ Moreover, you may find several other sources through internet search. Regards.
  5. Seismic performance or resistance of a structure having a 'torsional irregularity' will, in general, be less than a structure WITHOUT such irregularity. Therefore, the design codes have put limits and restrictions on the types of seismic-force-resistance-systems as well as the configurations that can be used for such structures. Actual performance level, however, will vary depending upon whether the torsional irregularity is less or more than the 'Extreme Torsional Irregularity' as given in applicable design or loading code. Torsional Irregularity may be reduced in certain cases, e.g., by changing the building configuration. Following links may help you understand torsional & extreme torsional irregularities as well as their effects on structures:- 1. Effects of torsional irregularity to structures during earthquakes 2. Extreme Torsional Irregularity Regards.
  6. CSI SAFE also has a Detailer. You may export ETABS results to SAFE and using the commands available under its 'Detailing' menu option, it will prepare structural drawings for you. You may give it a try to see whether it fulfills your requirements or not. Regards.
  7. it would depend upon the material of construction being used. In general, load combinations involving seismic (earthquake) effects will be critical for RC structures. Whereas, for steel structures, those involving wind effects will be more critical. In practice however we check the structures for structural safety against the load combinations (specified by applicable material design / loading codes) involving all type of loads that are expected to be resisted by the structure during its entire design life. Regards.
  8. Agreed, in general. However, there are situations where provision of an RC beam and even RC wall becomes necessary. My previous reply was with reference to the general case of two wall footings of same slab size (both in plan and in thickness), but one of them with an RC beam of height more than the thickness of footing slab. In practice however the type of footing used will vary with the site situation. For example, in case of an ordinary two storey masonry wall building without basement, simple strip footing (of a uniform thickness) should be ok in most of the strong soils with uniform strata. On the other hand, strip (or even a raft) footing with beam(s) may however be required to avoid differential settlement for sites with scattered loose subsoil pockets. However, for the specific cases of buildings with a basement, either in weak soils or at locations where the subsoil water level is high, provision of even an external RC wall (for the purpose of retaining earth, or prevention of moisture inside the building etc.) becomes desirable. The problem highlighted in the Original Post also falls in this latter category. Regards.
  9. A wall footing with an RC beam (of height greater than the thickness of footing slab) will have a greater stiffness than the one without beam. As such, it will have more capacity to resist longitudinal bending of wall / footing caused by any concentrated loads, as well as in spanning over some loose pockets existing within the soil beneath. Regards.
  10. Very vital information, and in urdu as well for understanding of all. Must be shared with as many construction related people as we can. Thanks @Junaid! for sharing such an important document. Well done!
  11. Very important message! I myself have received questions in my inbox more than once, from some of the forum members asking for help on various technical matters. However, I have always advised them to put the questions on the forum, as it has multiple advantages, both for the originator as well as for rest of the forum members. By posting the question on the forum (instead of sending to an inbox), the problem is visible to all the members, and it is likely to get not only a quicker response but more & better responses as well. In addition, the question and responses are helpful for rest of the forum members in general, and those members particularly who do have same problems but somehow (due to shyness etc) couldn't ask the same questions on the forum themselves. In view of the above discussion, I strongly second the opinion of UmarMakhzumi, for posting of problems to the forum itself, instead of sending them to inboxes of moderators or other forum members. Regards.
  12. What are the various spans, slab thicknesses, and beam & column sizes used in the model?
  13. You haven't provided any details regarding your structure, e.g., geometry, spans, no. of stories, building usage, seismic zone, etabs version being used, etc. etc. As such, it is difficult to give more suggestions. If you could attach your model file here, people here might help you in a better way.
  14. Wa alaikum assalam, 1. Lateral force resisting system (LFRS) is selected primarily based on the seismic zoning (or seismic category) of the area in which a building or structure is to constructed. LFRS selection partially depends upon the preferred material of construction (e.g., Reinforced Concrete, Structural steel, etc) as well. 2. if you don't have load bearing walls in your structure to transfer superstructure ( floor and roof ) loads to the foundation, it is NOT a 'load bearing wall system'. 3. A 'moment resisting system' is the one in which beams and columns are used to transfer the superstructure loads to the foundation. The walls provided in this type of structure are commonly termed as 'infill walls' or non-load bearing walls. HTH Regards.
  15. In case you have subdivided the beam (that is supporting the lowest picked-up column) correctly for creating the support point of picked-up column, it is unlikely that you don't get the beam design or reinforcement. It appears that you might have missed something or made some mistake in your model. See the attached image (taken from an ETABS 9 model, I have created to cross-check the results) and note the reinforcement of the left side beam (supporting the picked-up columns), as well as for the supported columns at all levels.