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  1. ahmedhegazi

    Sway Column Stabilty Index

    Hi All, I am referring to ACI 318-11 and same applicable to 2014 code version Two questions as follow 1-For Stability Index (Q)equation 10.10 , should Δo ( the first-order relative lateral deflection between the top and the bottom of that story ) be multiplied by Cd ( deflection amplification...
  2. ahmedhegazi

    Using Ritz vector to capture 90% Mass participation

    i am doing modal analysis for one structure where i started by using eigen vector to define modes of vibration after running 150 modes , i captured only 70% of mass in X,Y and Rz direction with last mode = 0.08 second Thinking to shift from Eigen to Ritz vector as many articles recommend it...
  3. ahmedhegazi

    Time History Scaling Tool

    Hi Gents, Does anyone know of tool/software for scaling time history data to match design response spectrum. i am talking about scaling over range of period for instance 0.2T to 1.5T as required by ASCE. Regards.
  4. ahmedhegazi

    Etabs 2015 - Wall Hinge Reinformcent

    Hi All, Etabs 2015 has the option for assigning Wall Hinge which can be used in Performance based design . the problem i notes is what value is assign of reinforcement to the wall hinge , i always get Hinge PM interaction curve based on 0.4 % reinforcement , did anyone experience this problem...
  5. ahmedhegazi

    Replacing moment frame by outrigger/belt truss

    According to ASCE07-05 table 12.2-1 , Special reinforced shear wall is not allowed to be used for SDC (E)for buildings exceeding 160 ft in height. This put requirements for adding moment frame to Special reinforced shear wall(Dual system) for resisting seismic force. My question is ,can the...
  6. ahmedhegazi

    Load angle into steel plates

    i have a case where a vertical steel plate is perpendicular to another horizontal steel plate forming a T shape , the horizontal plate is supported by stiffeners. MY calculation assumption is that horizontal plate is going to act as a simply supported beam on two stiffeners,where i have to...
  7. ahmedhegazi

    Sesismic parameters Azerbaijan -Baku

    Dear All, i am in process of designing one structure in Baku-Azerbaijan Does anyone has got seismic parameters used there according to UBC97(Seismic Zone) or ASCE(Sa,S1) ....?
  8. ahmedhegazi

    UBC 97 laeral displacement

    According to UBC97 clause 1630.9.1 Determination of (Delta)S. A static, elastic analysis of the lateral force-resisting system shall be prepared using the design seismic forces from Section 1630.2.1. Alternatively, dynamic analysis may be performed in accordance with Section 1631. Where...
  9. ahmedhegazi

    Correlation Between Seismic Zone UBC and IBC

    i am in process of designing structure with seismic zone assisgned according to IBC 2006 ,the problem arise that the structure is classified according to UBC as seismic Zone 2B , does anyone know a method where i can correlate between between UBC97 to IBC 2006 so that i can get the parameters Ss...
  10. ahmedhegazi

    Factor of Safety for Uplift -Tension Piles

    Hi All , According to ASCE , Service Load Combination for uplift check =0.6D+U , this would produce factor of safety 1.67 When using tension Piles to resist uplift , normaly factor of safety for skin friction =3.0 . As a result of this , we end up getting global factor of safety =1.67*3.0 =...
  11. ahmedhegazi

    Truss vibration for Rhythmic activity

    i am analyzing a truss 33 m span 2 meters deep supporting concrete slab decking and secondry beams for the use of multipurpose sport hall (no seating) , where spacing between trusses is 4 meters, i am using DG 11 for vibration check i would like to hear for you about the following vibration...
  12. ahmedhegazi

    Long Fin Plate

    Hello, i am designing a simple beam to beam connection where secondary beam is connected to main beam using Welded Fin plate and bolts , for ease of fabrication and installation , contractor is requesting no cut off in beam top flange with long fin plate. checking the design standards they...
  13. ahmedhegazi

    Effective Peak Velocity Related ACC.-UBC97

    According to UBC97 for steel design there is a requirements to classify the structure according to Effective Peak Velocity Related Acceleration (Av),does anyone know how to calculate that value ?
  14. ahmedhegazi

    3d face draw of pipes

    Dear All, i am doing pipe stress analysis in 3d using finite element analysis software SAP2000. 3 pipes are intersecting together forming K shape. Sap 2000 reads shell surfaces as 3dface objects from autocad. is there a way to draw pipes as 3dface in autocad?
  15. ahmedhegazi

    Through Plate Strengthing CHS

    i have a truss formed out of CHS (Circular Hollow Section) where diagonal members are welded to Chord ,after checking the limits as per AISC chapter K ,found that joint require strengthening as Chord Plastification capacity is less than diagonal force . what would be easier for fabricator is...
  16. ahmedhegazi

    Temperature Effect on Slab

    Hell All, i have got basement RC slab with plan dimensions 60X60 ms slab where it is serving as car parking with grid of columns and flat slab ,outer perimeter of the slab is supported by Basement RC wall on two sides (L shape) while the other 2 sides are supported by columns (as there is ramp...
  17. ahmedhegazi

    Beam Links Spacing

    Hello All, ACI 318 specifies maximum spacing between links along the beam span, however there is no specified value i could find for spacing of legs perpendicular to the span,what do you normally use and based on what? Regards
  18. ahmedhegazi

    Splice of unequal flanges sections

    Hello All I have got a splice in an I steel section where flanges are unequal(the top one is 380mm wide and bottom one is 550mm) Difference in dimension as it is a composite beam,i am bout to design the splice,common practie for designing splice is always diving the moment by depth of the...
  19. ahmedhegazi

    Restraing Compression Flange LTB

    Dear All I got a composite floor slab(steel and concrete slab) where they are connected toghter using shear studs and metal decking, the problem is i have got a cantilever beam nearly 5 meters ,allowable stress considering lateral torsional buckling is exceeding allowable , i have a though to...
  20. ahmedhegazi

    Modulus of elasticty for concrete with tempreature change

    Hi all, I have a building with a floor slab of considerably big length around 120 Meters, we decided that thermal analysis is required to study the effect of increase and decrease of temperature between winter and summer with respect to construction temperature. After analysis we found that...

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