Abstract
In high-rise buildings earthquake ground motions induce bending deformation of the host structure. Large dynamic displacements at the top of the building can be observed which in turn lead to the excitation of the cables/ropes within lift installations. In this paper, the stochastic dynamics of a cable with a spring-damper and a mass system deployed in a tall cantilever structure under earthquake excitation is considered. The non-linear system is developed to describe lateral displacements of a vertical cable with a concentrated mass attached at its lower end. The system is moving slowly in the vertical direction. The horizontal displacements of the main mass are constrained by a spring-viscous damping element. The earthquake ground motions are modelled as a filtered Gaussian white noise stochastic process. The equivalent linearization technique is then used to replace the original non-linear system with a linear one with the coefficients determined by utilising the minimization of the mean-square error between both systems. Mean values, variances and covariances of particular random state variables have been obtained by using the numerical calculation. The received results were compared with the deterministic response of the system to the harmonic process and were verified against results obtained by Monte Carlo simulation.
Highlights
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High-rise buildings are very sensitive to dynamic loads because of their slenderness
Dynamic wind loads or earthquakes lead to large sway motions of high-rise buildings
Summary
High-rise buildings are very sensitive to dynamic loads because of their slenderness. The time-dependent types of loading that have a significant influence on this type of the structures are wind and earthquakes. Due to their nature they should be treated as non-deterministic forces. Dynamic wind loads or earthquakes lead to large sway motions of high-rise buildings. In the design process we need to satisfy all requirements to make sure that the structure is safe. Designers are constantly trying to increase the load-bearing capacity of such systems and the comfort of people staying inside through the use of innovative solutions and materials or methods of monitoring. Some examples can be found in [1,2]
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