Conceptual design of a building with columns and shear walls

1)

ans:

criteria		(A)	(B)	(C)
restraint of floor shrinkage	observation	full restrain at corners.	corners are free and edges are restrain.	non-uniform restrain at edges
	conclusion	option(a) high restrain to shrink it leads to crack option (b)its average shrink and cracks option(c) un-uniform restrain leads to less shrink and cracks
the laterial stiffness	observation	comparatively low laterial stiffnessin both 'X'AND'Y'.	uniform and comparatively high laterial stiffnessin both 'X'AND'Y'.	non-uniform laterial stiffnessin both 'X'AND'Y'.
	conclusion	option(b) uniform high laterial stiffnessin both 'X'AND'Y',compare to option (b) and (c).
torsion with respect to vertical axis	observation	corner wall provide more twisting resistance	edge wall provided good twisting resistance	non uniformm wall provide less twisting resistance
	conclusion	option(a) is the best option for teisting resistance.option (c) is worst one
vertical reinforcement for similar base capacity	observation	walls are provide nominal flexural moment and high twisting moemt	walls are provide nominal flexural moment and twisting moent	walls are provide high flexural moment and twisting moent
	conclusion	option(b) requred less reinforcement.option (c) requred more reinforcement compare to other two options
static eccentricity	observation	structure is symmetric	structure is symmetric	structure is non-symmetric
	conclusion	option(c) is only static eccentricity
system’s redundancy	observation	uniform placement and lateral load support on both the axes	uniform placement and lateral load support on both the axes	concentrated lateral load support on both the axes
	conclusion	option(b) and option (a) is preferable compare to and (c)
foundation systems	observation	design of 'L' shaped geomentry foundation is critical	wall are stright,eassy geometry foundation	wall are stright,eassy geometry foundation
	conclusion	option(b) and (c) are mor convenent for foundation system.
architectural constraints	observation	wall are in corner there is no objection for architectural	there is objection for architectural because shear walls located at middle,	there is objection for architectural because shear walls located at non uniform along the building line
	conclusion	option(a) is better for architectural constraints than option (b) and option (c)

2)

ans:

Loads transfer along both axes X and Y:

the beams are connected in a x and y direction, lateral loads are transfer from one beam to another beam long beam leads to shear failure for example lateral load transfer to B3 to B4 load will transfer to the B9,B9 beam leads to shear failure.

Eccentricity:

the distance between center of mass of the building and center of stiffness of building is long the torsional

moment in x and y direction

Qualitatively failure and solution:

• the size of the beam 25/50 and size of column is 25/25 since we dont have reinforcement details weak column strong beam failure may occur.
• make the structure in uniform and resisting of all the above failure.

3)

ans:

• the floor plan is unsymmetrical and non uniform, the internal columns are zig zag.
• internal columns cannot resist lateral loads ,internal columns take gravity loads, to resist lateral loads need a shear wall at corner of the building.
• the right side of the building is larger than left side, so shear wall should provide larger than left side.
• for L shaped shear at all corners need to go box foundation. to resist lateral loads,
• tie beams are connected at each other at bottom level to disterbute the load uniform
• beams play a key roal to transfer shear from floor to beams
• internal colum supported isolated footing are connected to shear wall to transfer loads.