Should the foundation foot bolts of the tower be arranged at the mid-span or centered?

It’s usually across the midpoint, but I don’t think there’s any mandatory requirement, right?

All I’ve seen have the loads distributed evenly across the span, but it seems there’s no mandatory requirement for that either~~~

Most are distributed across the mid-span; those that are centered seem to be rare

This is actually a matter related to design conventions; however, what I’ve seen are cases where the alignment is across the center, while alignment in the middle is less common. There seems to be no mandatory standards in this regard, so it’s probably not necessary to take wind direction into account

*It is arranged across the span habitually, but centered arrangement has also been encountered. The specifications do not require it, and it has nothing to do with the wind direction. It’s mainly *habit

It should be evenly distributed across the span, mainly due to the fact that wind directions in our country are primarily from north to south.

It should be positioned at the mid-span with respect to the dominant wind direction, so that under wind load, at least two bolts experience the maximum stress.

What was said upstairs makes some sense; it’s about *habit, but what’s taken into consideration is still the load-bearing capacity of the bolts

The distribution is more even across the mid-span; it’s just a matter of convention. What does it have to do with the direction of the wind? Who said that the wind always blows due south or due north, without any deviation at all?

Agreed. Although we have taken wind load into account in our calculations, in practice it is advisable to distribute the wind load as much as possible by using multiple bolts to bear it. This is similar to the approach used with side-mounted flanges, where the bolt holes are arranged along the midsection; one reason for this is to prevent corrosion of the bolts in case of leaks, and the other reason is to allow two bolts to share the load during lifting.

It was mentioned at the training course in Zhangjiajie last year: it should be arranged across the mid-span with respect to the dominant wind direction, so that when subjected to wind loads, at least two bolts experience the maximum stress – this is essential.

From the calculated wind direction frequencies, it is possible to determine which wind directions are most common and which are least common in a particular area. Observations show that in northern China, the Yangtze River basin, southern China, and coastal areas, northward winds (north winds, northeast winds, northwest winds) prevail in winter, while southward winds (south winds, southeast winds, southwest winds) are common in summer. For example, in Haikou, the prevailing wind direction throughout the year is the northeast wind, followed by the east wind and the southeast wind; the normal wind strength is below level 4. In Chengdu, westerly winds dominate the wind direction. It seems that the prevailing wind directions vary from place to place; therefore, when designing tower equipment, the position of the foundation bolts must be determined based on the prevailing wind direction in the location where the equipment will be used.

The mid-span distribution of flange screw holes refers to the centerline of the span! The purpose of doing this is to prevent the fluid inside the device from dripping directly onto the bolts in case of a leak, thereby avoiding corrosion of those bolts. It has no impact on ensuring even distribution of forces on the bolts, and it’s not necessary for them to be arranged at a 45-degree angle; for example, there can be 8 or 12 bolt holes, etc. This post was last edited by www557 on 2009-3-5 10:34]

There should be no requirements regarding the foundation bolts of tower equipment; whether it is installed at the mid-span or in a centered manner, it does not affect the stress on the tower.