The bare frame models of three different configurations, such as regular configuration on plain ground, setback configuration on plain ground and setback configuration on sloping ground are compared to study the basic difference between these structures.
The building is symmetric in plan and elevation up to the third storey on plain ground, but setback is located in the fourth and fifth floors.
Base shears of the setback models on plain and sloping ground are shown in Fig. 6.
From Fig. 3, the difference between axial force distribution along the storey height of regular and setback buildings on plain ground is observed.
Their early sketch of 500 Fifth Avenue shows a series of setbacks leading to a plain shaft with thick piers, as if to emphasize massiveness.
A residential setback building resting on plain and sloping ground has been analysed.
Open image in new window Fig. 10 Variation of torsional response of all the setback models, a on plain ground in RSM, b on plain ground in ESFM, c on slope in RSM and d on slope in ESFM.
In this paper, an attempt has been made to evaluate the seismic performance of setback structures resting on plain ground as well as in the slope of a hill, with soft storey configuration.
Open image in new window Fig. 9 Variation of storey drift in the major direction of force (X direction) of all the setback models, a on plain ground in RSM, b on plain ground in ESFM, c on slope in RSM and d on slope in ESFM.
Open image in new window Fig. 8 Variation of storey displacements in the major direction of force (X direction) of all the setback models, a on plain ground in RSM, b on plain ground in ESFM, c on slope in RSM and d on slope in ESFM.
Open image in new window Fig. 6 Base shear of all the setback models a resting on plain ground and b resting on slope.
