Feb 9, 2021 · Topographic Factor, Kzt: Kzt = (1 + K1K2K3)2. K1, K2, K3 are determined from Figure 26.8-1 of ASCE 7-10 based on ridge, escarpment, and hill. If site conditions and locations of structures do not meet all the conditions specified in section 26.8.1 then Kzt =1.0.

Velocity pressure, qz or qh, shall be calculated from the formula: where. Kz = Velocity pressure exposure coefficient as per Table V (ASCE 7-95 Table 6-3). *Kzt = Topographic factor.

Topographic Factor, Kzt: Kzt = (1 + K1K2K3)2 where: K1, K2, K3 are determined from Figure 26.8-1 of ASCE 7-16 based on ridge, escarpment, and hill.

Kzt is a topographic effect factor to account for speed up over hills. Since I reside in Florida I use Kzt equals one and established that as the default value. Refer to your states Kzt values and adjust the value as required.

Oct 2, 2023 · Kzt Topographical Factor Figure 26.8‐1 Kzt= (1+K1K2K3)2 • K1 = Factor to account for shape of topographic feature and maximum speed‐up effect. • K2 = Factor to account for reduction in speed‐up with distance upwind or downwind of crest. • K3 = Factor to account for reduction in speed‐up with height

Jul 18, 2023 · The formula used by the calculator is: F = 0.00256 * Kz * Kzt * Kd * Kzt * V^2 * A. In this formula, F represents the wind force on the structure, Kz is the exposure coefficient, Kzt is the topographic factor, Kd stands for wind directionality factor, V denotes basic wind speed, and A is the projected area of the structure normal to the wind.

Nov 29, 2024 · In this section, we will discuss the effects of topography on wind load on structures by calculating the topographic factor Kzt using ASCE 7-16. Speed-up effects due to abrupt changes in topography must be considered in calculating the design wind pressures.

There are 3 main definitions here to calculate the wind load. BASIC WIND SPEED, V : Three-second gust speed at 33ft (10m) above the ground in Exposure C (see Section 26.7.3) as determined in accordance with Section 26.5.1.

Velocity pressure exposure coefficient, Kz, shall be determined in accordance with ASCE 7 Section 27.3.1 and the topographic factor, Kzt, shall be determined in accordance with ASCE 7 Section 26.8. For the windward side of a structure, Kzt and Kz shall be based on height z.

Feb 7, 2019 · Kz is velocity pressure exposure coefficient. Kzt is the topographic factor. Kd is wind directionality factor. V is the basic wind speed. Velocity pressure exposure coefficients, K z are listed Table 27.3-1 of ASCE 7-10 or can be calculated as. Kz = 2.01 (z/zg)2/α.