Conceptual design of a building with columns and shear walls
q.2)issues in the given framing plan:
indirect lateral load transfer in x and y directions- the beams are connecting to another beams which is ineffective during lateral load transfer. in such conditions, the primary beam is prone to shear failure.
eccentricity- the longer the distance between center of mass and center of stiffness, the higher torsional moment of the building. as per given plan eccentricity , the building is subjected to higher torsional moment in both x and y directions.
strong beam weak column possibility- the size of columns majorly mentioned as 25cm *25cm. but all the beams have much deeper section. inertia of beam is visually higher than column. if the column reinforcement is adequately greater than that of beams, we are ok and since we do not have the reinforcement detail, this is doubtful. it is recommended to have slight bigger sizes for column.
q.1)
| CRITERIA | A) | B) | C) | |
| restraint of floor shirnkage |
observation conclusion |
full restraints at all corners option(a) will have higher restraint to shrinkage, thus lead to cracks in the floor . |
corners are left free but restraints along the edge option(b)is average. |
non uniform restraints option (c) will not effectively restrain the shrinkage , so possibly less cracks. |
| the lateral stiffness |
observation conclusion |
comparatively lower lateral stiffness in both x and y |
uniform and comparatively higher lateral stiffness in both x and y will provide higher lateral stiffness for a pure seismic acceleration x and y direction. |
non uniform lateral stiffness in both x and y |
| torsion with respect to vertical axis |
observation conclusion |
corner walls provide more resistance to twist will be best option with respect to torsional resistance |
edge walls provide good resistance to twist |
irregular walls provide very poor resistance to twist is the worst one. |
| vertical reinforcement for similar base capacity |
observation conclusion |
walls are subjected to nominal flexural moment and heavy twisting moment |
walls are subjected to nominal twisting moment will require least |
walls are subjected to heavy flexural moment and twisting moment. will require higher. |
| static eccentricity |
observation conclusion |
structurally symmetric | structurally symmetric |
un-symmetric will have static eccentricity and it is significant. |