Research on Wind Load Calculation Based on Identical Guarantee Rate Method

Abstract

Wind load on building surface is one of the main loads for structural design; scholars in this field have put forward some methods to calculate wind load, such as Simiu method and Kasperski method. Based on the basic theory of probability and the systematic analysis of the surrounding environment and turbulence, a random variable model for calculating wind load is established. According to the model, through the analysis of the relationship between guarantee rate and wind load, a numerical calculation method to calculate wind load is proposed based on extreme value analysis and polynomial fitting theory. To verify the performance of the algorithm, wind tunnel experiments were carried out to obtain a large number of first-hand measured data of high-rise building (Shanghai World Financial Center). Based on the measured data, the algorithm is simulated, and calculated results are analyzed, including wind pressure distribution on building and probability distribution of fluctuating wind pressure of some measuring points. The validity and accuracy of the proposed model and algorithm are verified by the comparative analysis and theoretical analysis of the calculation results.

Study on Non-Stationary Wind Speed Models and Wind Load Design Parameters Based on Data from the Beijing 325 m Meteorological Tower, 1991–2020

“…In the standard [51], calculating the design wind load for specific heights uses fixed wind pressure height variation coefficients. For terrain features categorized as Class C and Class D (urban terrain features defined in the standards [51]), the empirical formulas for wind pressure height variation coefficients are, respectively, given by Equation ( 17 (17) where µ C represents the wind pressure height variation coefficient for Class C terrain features, µ D represents the wind pressure height variation coefficient for Class D terrain features, z corresponds to the height value, and the empirical coefficients 0.544 and 0.262, respectively, represent the surface roughness coefficients. The formulas are derived based on wind profile equations and wind pressure calculation formulas, and the specific derivation process is not elaborated here.…”

“…Then, by calculating the basic wind pressure values from basic wind speed values, actual wind pressure height variation coefficients for the 15 height layers can be obtained. The wind pressure height variation coefficients in the standards provide values only for specific heights, but they can be converted to the heights used in the measured data in this paper using Equation (17). Since it is challenging to quantify ground roughness using measured data, actual values are computed using roughness indices identical to those specified in the standards for different terrain types, as shown in Table 9 (where the cutoff height for Class C terrain in the standards is 15 m and for Class D it is 30 m, meaning that wind pressure height variation coefficients below the cutoff height are taken at the position of the cutoff height, with an approximation for the 32 m height in Class D terrain to 30 m).…”