One of the problems encountered in the estimation of wind effects on high-rise structures is the development of combinations of such effects as translational responses and the rotational response to wind, and/or forces and moments at various cross sections of individual structural members. In current wind engineering practice such combinations are developed largely by eye since phase information on the effects being combined is not readily available from frequency domain analyses. In contrast, full time series analyses can produce estimates of combined wind effects, since they preserve phase information; however, such analyses can be too time-consuming. To solve the problem, this study developed a time domain, database-assisted design (DAD) procedure, that uses a multiple points-in-time (MPIT) approach, and illustrated the procedure by an application to a 60-story reinforced concrete structure. Results showed that the MPIT ap-proach produces remarkably accurate estimates of the peak combined wind effects by using a li-mited number of peaks of the time histories of the individual wind effects being combined. Those estimates are obtained far more economically in terms of computational time than conven-tional time domain analyses that use full time histories. It is noted that frequency domain tech-niques are not capable of performing accurate estimates of peak combined wind effects owing to the loss of phase information between the random processes being combined.
Citation: Technical Note (NIST TN) - 1711
NIST Pub Series: Technical Note (NIST TN)
Pub Type: NIST PubsReport Number:
Database-Assisted Design (DAD), mean recurrence interval, reinforced concrete, time-domain analysis, point-in-time approach, wind effects.