This study investigates the spatial coherence function of wind loads on the lattice frame structure through a simultaneous double high frequency force balance (HFFB) wind tunnel test. The wind forces on two segment models of the lattice frame structure are simultaneously measured by the wind tunnel test for several configurations of the models with different lateral and vertical distances. Coherence functions from the test are then calculated and compared with the existing coherence functions for tall buildings or tapered stacks. Results show that none of the existing coherence functions can provide an accurate enough estimate of the coherence function of wind loads on the lattice frame structure. Additionally, the coherence function of wind loads is affected by the frequency of wind loads, force direction, lateral and vertical distances. An expression of the coherence function specific for the lattice frame structure is then developed based on the wind tunnel test results. An example is presented to show the application and significance of the developed expression. The findings of this research can provide a more accurate estimate of the coherence function of wind loads on similar lattice frame structures, and hence the resultant generalized wind forces and wind performance of similar structures.

本研究通过同步双高频力平衡 (HFFB) 风洞试验研究风荷载在格架结构上的空间相干函数。通过风洞试验对具有不同横向和垂直距离的模型的几种配置同时测量格构框架结构的两个段模型上的风力。然后计算来自测试的相干函数，并将其与现有的高层建筑或锥形堆叠的相干函数进行比较。结果表明，现有的相干函数都不能对格架结构上的风荷载的相干函数提供足够准确的估计。此外，风荷载的相干函数受风荷载频率、力方向、横向和垂直距离的影响。然后根据风洞测试结果开发特定于格子框架结构的相干函数表达式。举例说明了所开发表达式的应用和意义。这项研究的结果可以更准确地估计类似格架结构上风荷载的相干函数，从而得出类似结构的广义风力和风性能。