Abstract
A numerical algorithm is presented to analyze earthquake response of tall reinforced concrete (RC) chimneys based on stick multidegree-of-freedom models. The algorithm considers the eccentricity phenomena between spatial discrete nodes and corresponding centroids of investigated lumps. The spatial discrete segments of the chimney are used to construct the investigated lumps. The equations of dynamic equilibrium of the investigated lumps are derived, and the numerical calculation procedure is implemented. Phenomena of eccentricity are studied for 150 m and 210 m RC chimneys. Seismic stresses and effects of vertical ground motion for the two chimneys are also studied. Numerical results show that the tensile and compressive stresses of the seismic control cross sections of the chimneys may increase under the actions of several specific earthquake waves by considering existing eccentricities. The effect of eccentricity on the earthquake responses of tall RC chimney should be considered, and stresses caused by vertical ground motion should not be neglected to obtain accurate earthquake response of chimneys.
Highlights
Research and calculations of earthquake response are necessary for the designs of tall reinforced concrete (RC) chimneys under the action of earthquakes
Two RC chimneys of 150 m and 210 m height are studied. e numerical results show that the effects of such eccentricities on earthquake response should not be neglected for tall chimneys, as well as the vertical ground motion
We study bending wave propagation of a beam to verify the effectiveness of the new algorithm. e beam with equal cross-sectional area is designed to avoid eccentricity. e result given by the finite difference method [29] is used to test the proposed numerical algorithm
Summary
Research on seismic damage of chimneys indicates that the destructive effect of vertical earthquake on chimneys should be considered [1]. Ey found that vertical seismic action should be considered in the structural design of chimneys. Sarkar et al [26] studied the effects of different base conditions on the design value of shear force and bending moment of different sections of a 275 m tall RCC multiflue chimney by using a response spectrum method. Liu et al [28] studied the structural dynamic performance and elastic-plastic seismic response of a 240 m high specialshaped RC chimney. E numerical results show that the effects of such eccentricities on earthquake response should not be neglected for tall chimneys, as well as the vertical ground motion Two RC chimneys of 150 m and 210 m height are studied. e numerical results show that the effects of such eccentricities on earthquake response should not be neglected for tall chimneys, as well as the vertical ground motion
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