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TORSIONAL BEHAVIOUR OF BUILDINGS ON SLOPES DUE TO LATERAL LOADAuthor: Rahul Suresh Vishwakarma Date: 2020-09-12 Report no: IIIT/TH/2020/81 Advisor:Pradeep Kumar Ramancharla AbstractBuildings on hill slopes are highly vulnerable due to its less resistive lateral load capacity. These type of buildings are unsymmetrical and are of in irregular configuration. There are variations in the column height which gives eccentricity to the structure as the centre of mass and centre of rigidity doesn’t coincide. This irregularity leads to its torsional behavior and gives us the necessity for analysing these buildings for its base conditions and its behavior by changing its plan configuration. When lateral load is applied in plain building along one direction, it is observed that middle frames will take 30% of the loads and corner frames will take 20% of loads but this kind of distribution is not observed when lateral load is applied along the ridge direction (non- valley direction) on a building of hill slope. The building considered are step-back building. In these buildings the heights in the valley direction increases and all the floors points (connection with columns) are aligned in a plain parallel to ridge direction (non-valley direction). Two types of buildings are used, the first is Bare frame and then bracings are used to structure to check the effect of change in stiffness of frames on Twist, Axial Force on the road level Beam and on the load distribution. This thesis contains the calculation of Twist which is an effective parameter to decide the behavior of the building, Axial forces on the members that can lead to collapse in the structure and about the twist variation with change in the aspect ratio and with change in stiffness of the structure so that the suitability of the configuration can be known of the building. The building on hill slopes does not behave similar to the buildings which are on plane ground. Change in the Aspect ratio means changing the length of the building in ridge direction. Changing the length in valley direction will disturb the load path of gravity load for each and every change in the structure and after some increment of the length in valley direction will fail the structure for its gravity load path. So the length of the building can’t be extended along the valley direction but changing the length along ridge direction does not effect that much to the load path of gravity load and it can be obtain a best aspect ratio of the structure for that region. Change in the stiffness of the building means changing the stiffness of the frames and making the building stiffer. The more frames will be stiff the more buildings will be stiffer, stiffness of frames are considered so that the translation of the frame and the rotation of the floor can be minimized. The aim of the thesis is to produce a building on hilly slopes that will be less torsionally active by a procedure. The procedure may be applying a bracings or changing the aspect ratio or both in the structure and finally conclude with data’s and results by analysis. Full thesis: pdf Centre for Earthquake Engineering |
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