The design shear for beam-column joint depends upon the relative strength of beam and column at the joint. The joint should be Constructible: Congestion of reinforcement is the main concern. The shear strength of the joint must enable the transfer of moment and shear through it.
If bars can transfer moment, they can also transfer shear as far as monolithic construction is concerned. This implies that the size of the column must be such that bars can develop their tensile forces. It means that longitudinal bars must have adequate development length for hooked bars. Longitudinal bars of beams, or slab, must be able to develop their yield stress, so that the beam/slab can transfer moment to joint.
Etabs 2017 system requirements code#
Hence, the joint can go through significant degradation of strength and stiffness, and if it fails in shear, or anchorage, the life-safety objective of code cannot be achieved.ġ.4.THINGS TO CONSIDER FOR BEAM COLUMN JOINT *SEFP Consistent Design**Pile Design**Doc No: 10-00-CD-0007**Date: April 16, 2018*īeam-column joint must transfer the forces, such as moment, shear and torsion, transferred by the beam to the column so that the structure can maintain its integrity to carry loads for which it is designed.Īnother function of the beam-column joint is to help the structure to dissipate seismic forces so that it can behave in a ductile manner.ĭuring an extreme seismic event, the code-based structure is expected to maintain its load-carrying capacity for gravity loads even after the structure deforms into inelastic range so that it does not pose any life safety hazard. I have recently graduated and joined a structural design firm, so kindly guide me, considering me a beginner.
Etabs 2017 system requirements how to#
Secondly, it would be great if someone can recommend me a book or some good source to understand how to characterize building using performance levels. Any input concerning assignment of hinges to beams, columns and shear walls is highly appreciated. I would like to know what would be a better estimate for relative distances for plastic hinges in case of beams, columns. While assigning plastic hinges, I have an option of using ASCE 41-17 (Seismic Evaluation and Retrofit of Existing buildings". I will be using ETABS 2017 for performing Pushover Analysis. Until now, I have decided to go with "Displacement Co-efficient method". I'll be performing "Non-Linear Static Pushover Analysis" for my model. I am interested in performing "Performance Based Design" for a 20 story building.
Secondly as you suggest " Furthermore if u r going for building frame system modify the moment of inertia about x and y directions in the section modifiers of the columns as 0.1 for both x and y directions.:" reducing the moment of inertia in both direction will not reduce also the axial load carrying capacity ? If we want the building structure to behave as a building frame system (gravity load by frames and lateral load by shear wall) then do we need to make sure while modelling that none of the beams are resting on the wall and transfering the gravity loads as well to them ? and when u rerun the model design the columns for 25% of the base shear.Īgain another thing to note is that use the first model with no earthquake load amplification for design of bracing elements and the 2nd model with earthquake load amplification is to be used for columns design only. If the base shear shared by the columns is less that 25% of the total base shear you need to amplify the base shear.Į.g : If base shear shared by the columns comes out to be 5% of the total base shear, go to load cases and for Earthquake loads in x and y direction change the factor to 5 as 5x5 = 25. Compute the total base shear and the base shear shared by the column. If u r going for dual system let the section modifiers be as for moment resisting frame. My recommendation will be to use building frame system in Zone 1 ,2A and 2B and go for dual system in siesmic zone 3 and 4.įurthermore if u r going for building frame system modify the moment of inertia about x and y directions in the section modifiers of the columns as 0.1 for both x and y directions. Once u have added bracing elements in between the frames now its upto you how u consider ur structure to behave either as Building frame system or dual system.
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