Seismic Analysis of RC Structures With Absence of Floor Slab Constraints and Large Mass Turbine as a Non-Conventional Tmd

Abstract eng:
A case study is presented to reveal the influence of absence of floor slab constraints and large mass turbine as a nonconventional tuned mass damper (TMD) on the seismic behavior of the reinforced concrete (RC) structures and members. The investigated structure is a RC shear wall-frame power plant structure with large slab openings and a large mass turbine. In RC structures, the existence of floor slabs can usually provide strong constraints on beams so as to greatly increase their bearing capacity. However, due to some special functional demands, large area of slabs may have to be removed so that some floor beams will lose the constraints provided by slabs. In such cases, beams could be subjected to complex internal forces and develop unexpected failure modes under earthquake actions. Nonlinear time history analyses are conducted using the self-developed program COMPONA-MARC Version 1.0. The numerical model employs fiber beam-column elements with distributed plasticity approach. The complex seismic behaviors of structural members without slab constraints are elaborately simulated and analyzed. The time history analysis results indicate that for the structural members without slab constraints, significant transverse vibration and large transverse bending moment are the essential factors causing the failure of these components and should be considered with special attention in design. For the seismic effectiveness of the turbine as a TMD with large mass ratio, the optimizing approach is discussed and optimized parameters are verified by extensive numerical examples under a wide selection of ground acceleration time histories.

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