Abstract
ABSTRACT A reliable human comfort assessment depends on the correct description of the wind dynamic loads when compared with studies of natural wind. Thus, in this research work an analysis methodology was developed aiming to generate nondeterministic dynamic wind loadings, based on a power spectral density function and coherence function. This way, aiming to test the developed analysis methodology, a forced vibration dynamic analysis was carried out, based on a three-dimensional finite element model developed to represent a real and existing thirty-storey reinforced concrete building, with total height of 90 m, store height equal to 3 m and rectangular dimensions of 21.50 m by 17.30 m. The dynamic structural response of the investigated building was evaluated, the accelerations at the top of the structure were calculated and the human comfort was verified. The results obtained along this research work indicate that the peak accelerations calculated for periods of recurrence equal to 10 years and 1 year, respectively, overpass the recommended limits proposed by the NBR 6123 and ISO 10137.
Highlights
The construction of tall and slender buildings to meet the demand of population growth and the reduction of free spaces in urban areas has resulted in relevant structural problems related to excessive vibrations and human discomfort caused by the dynamic characteristics of the wind
The fundamental frequency of 0.25 Hz (f01 = 0.25 Hz), obtained through the modal analysis shows the need for dynamic analysis of the building since, as can be seen from the power spectrum presented in Figure 1, the largest transfer of wind energy is concentrated in the region of low frequencies
On the other hand, having in mind the limit of 0.075 m/s2, obtained according to ISO 10137 [24], in many situations this recommended limit was surpassed. This way, it can be concluded, having in mind the investigated building with fundamental frequency of 0.25 Hz (f01 = 0.25 Hz), that most of the peak accelerations violate the recommended limits for human comfort assessment. This investigation presents the results of a forced vibration dynamic analysis carried out based on a three-dimensional finite element model developed to represent a real and existing residential building (H=90 m), when subjected to non-deterministic wind loads
Summary
The wind series can be used to simulate the wind dynamic loadings and a reliable human comfort assessment can be verified based on the accelerations values (Bastos [17], Chávez [18], Oliveira [19], Santos [20] and Steffen [21]) In this investigation an analysis methodology was developed (Barile [1]), based on the work of Shinozuka et al [14], [16], aiming to generate nondeterministic dynamic wind loads considering the power spectrum of Kaimal and the coherence function of Davenport. The results obtained along this investigation indicate that the peak accelerations values calculated for periods of recurrence equal to 10 years and 1 year, respectively, overpass the recommended limits proposed by the Brazilian Standard NBR 6123 [23] and ISO 10137 Standard [24]
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