Abstract:

In this study, the basis of a pre-target ideal migration mechanism for the classical work-energy bond and the structure is calculated by movement from the general energy equation for the concrete frame type structures that show linear elastic behavior under earthquake effects. Due to the structural disintegration, the energy entering the structural systems with the earthquake is modified by a ratio and the energy balance equation is written in a modified form. The plastic energy included in the energy equation is reduced by a determined ratio, from the need to more realisticly take into account the environmental behavior of the structural elements. The reduction factors for plastic and input energies are determined by the basis of different studies in literature. External work done by the horizontal external loads for the base set for the construction is calculated by taking into account the equivalent static horizontal load distribution in the Turkish Earthquake Regulation. As a result of the synchronization of the plastic energy expression and the external work expression, the equations that give the energy-based base cutting forces are generated for different reduction factors. Energy-based design base cutting power values are calculated for four and seven-storey concrete frame structures. For the same framework, the average of the largest base cutting forces obtained from non-linear analyses in the time-definition field with the earthquake cutting records scaled to be compatible with the elastic design of the Z2 local ground class is compared to the energy-based base cutting forces and the results are interpreted.

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