When the building is a warehouse factory with a mezzanine floor. or no mezzanine However, there was a movement between the floors. What to consider is Torsion of the partition (partition racking) by lateral displacement index.
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Deflection divided by building height was defined as 0.0025 (1/400) for “first distress and 0.006 (1/167) for ultimate behavior of drywall at resting on the wall beard (stud), the deflection limit of the beam material
Mixed and non-mixed material beams and lateral movement of the building frame is as follows
Fixed load for the roof There is no specified limit for the roof. except when (1) the behavior of the roof is controlled by waterlogging, (2) the behavior is controlled by the roof performance, and (3) the behavior is controlled by the skylight performance. For the reason that the limit for The roof as a result of the static load from the roofing sheet has a very small weight, the installed ceiling will be considered as the live load added after the roof structure has been installed.
Static Floor Load: The permissible deflection is defined as the floor span length divided by 360 and shall not exceed a maximum value of 2.54 cm (1 in.), which will be used as the cumulative deflection limit. of the floor range The width between the main structures (bay). This limit allows for maximum deflection greater than specified. In the American Concrete Institute Aci standard, this limit of deflection does not need to be checked for unhardened concrete. which should be done check separately The loading weight for this deflection test will be the weight of the unhardened concrete, the weight of the structural steel slab. and the weight of the steel building frame For composite floors, the limit of deflection is equal to the instantaneous deflection upon composite action plus half the creep deflection applied. estimated
Roof Load: Permissible deflection is defined as span length divided by 360 when gypsum ceiling is used. and span length divided by 240. In other cases, the maximum limit should range between 0.95 cm (3/8 inch) and 2.54 cm (1 inch).
Ground load: Permissible deflection is defined as the floor span divided by 360 and shall not exceed 2.54 cm (1 in.) over the span between the main structures, considering half. one of the design payloads (or use another specification if a more stringent standard is imposed)
Lateral Load: Permissible deflection is defined as the building step height divided by 500 for the load in relation to the 10 year return wind speed. Between floors of factory buildings with or without mezzanine floors, only the stiffness of the exposed building frame is considered.
Design considerations related to vibration or acceleration.
In addition to considering the good usability in the building. Good usability will also include human response to vibration and the acceleration and reaction of the machine to the vibration as well. no need to consider The degree to be considered ranges from the discomfort and sense of safety of building occupants to physical illness and disuse of the structure. In the case of machinery, vibration can affect the performance of the machinery to deterioration or damaged under
In terms of the building structure Human responses to vibration can be divided into 2 categories: (1) behavior of building frames in response to wind or seismic forces and ground vibrations. In general, low-rise buildings do not have problems with structural behavior resulting from response to lateral force Because this type of building will have sufficient stiffness.
Human response to vibration
Floor vibrations and human response are important considerations in all types of buildings. Vibration analysis and design refer to Design Guidelines Guide American Institute of Steel Construction, Volume 11 (ASC Design Guide 11: Floor Vibrations Due To Human Activity (1997).
Machines and vibration
Where the behavior of machinery located in a building is a source of vibration or is subjected to vibration by other sources. The effects caused by vibration can be alleviated by the following methods.
- Machine Balancing
- Removing the vibration source Relocates or limits the use. For example, the crane rail should not be installed on the part used as an office building located in the factory area.
- Installation of equipment capable of reducing vibration in the form of passive or active devices.
- Isolation of the structure by using springs or vibration isolating rubber pads. (isolation pad)
- Adjusting adjacent structures to a natural frequency different from the critical freque, for example. The ground or floor component should have a frequency lower than 1/2 or more than 15% times the fundamental frequency of the device.
Therefore, vibration control is very important and must be coordinated by both owner’s equity to set the limits of vibration And it is the duty of the machine vendor to provide machine operation data