I am working on a 22-story building, primarily for an envelope renovation. The pertinent structural description is reinforced concrete frame, PT floor slabs and CFS infill exterior walls with portland cement plaster (stucco) cladding on gypsum sheathing. The design wind speed for the area is 119 mph (don’t ask why 119 vs 120!), but in two directions there is a fetch distance of over a mile over water.
The project was in litigation for quite some time, but eventually settled. During the litigation, I noted that there was more and varied cracking in the stucco on the upper floors. My thought was obviously more movement at the top. Independent of my observation, the occupants of the building (condominium) think there is a lot of movement at the top and they have asked that I measure that movement.
My thought is to perhaps use inclinometers at the four corners and two in the middle of the long side. Our only frame of reference is the building under no lateral load and we are not close enough to another comparable height building to obtain differential measurements.
Any other ideas to measure the drift? This will be done on a longer term monitoring basis since wind load events are hard to capture singly.