Making support points for the exterior wall systems of warehouses with internal mezzanine floors that must be made along with the frame. Perimeter buildings that are installed along the horizontal direction of the building.
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Such as supports coupled with edge beams, are regarded as having a high degree of reliability. It is the most complex and is the point that causes a lot of installation problems as well. By the way, there will be something to bring. Several issues were considered, such as determinate and indeterminate bonding characteristics. and there is also the problem of Deflection of the outer building structure added as well. It is also important when the load is applied. First of all, deflection must be considered before the exterior wall is installed. According to the height of each floor second building The deflection that occurs during the installation of heavy exterior walls must be Considering how it might affect the alignment of other components and finally, the deflection after the exterior wall has been installed must conform to the specifications given or supplied.
However, the fact that the external wall of the building is not in the plane of the perimeter frame is a Happens all the time and is inevitable. Therefore, the effects of deflection and/or displacement of protruding supports due to torsion of parallel beam faceplates must be considered. In the case of adhesion External building walls in a defined manner Must consider the deflection of the periphery beams, which will be related to the assembly process and the efficiency of use of joints and details in various parts. There must be control of the deflection that causes the force in Materials used as exterior walls
In general The vertical deflection of the perimeter frame shall be limited to span length divided by 480 for total static load considerations. provided that the deflection does not exceed 1 centimeter (3/8 in.) for the specified static load prior to installation, and 1.6 centimeter (5/8 in.) for the static load specified prior to installation. specified after installation.
In addition, the effect of the installation of the external wall of the building should be taken into account when the weight exceeds 25% of the total static load acting on the beam along the perimeter of the building. In which case the bend Due to the external building walls and the initial fixed load should be limited to a value of span length divided by 600 and not to be greater than 1 centimeter (3/8 inch).
The limits of vertical deflection after completion of the exterior wall of the building shall be in accordance with connections and details and must be related to the relative deflection between the layers as well which must be assigned Deflection due to live load does not exceed span length divided by 360 and shall not exceed 0.6 cm (1/4 in.) to 1.25 cm (1/2 in.), subject to specifications. in which to consider The design load can only use 50% of the design load (except for the top and bottom floors of the building) because this design considers the movement between different floors.
The limits for deflection and lateral displacement shall be compared with the calculated deflection values, including the creep effect. as appropriate, e.g. in the case of composite beams (composite bear)
Design Considerations Related to Interior Partitions and Ceilings
The performance of external walls and roofs is considered when preventing air and water leakage, but for interior partitions and ceilings, it is about aesthetics. cracks and bow deflection. Most of the surfacing materials are brittle and have relatively low allowable deflection. But except for the construction of the ceiling that uses acoustic panels and steel grids, which will not be considered these matters
Support deflection
For determining criteria or deflection limits for floors and roofs that support gypsum ceilings, it will be considered compared to the span length (L) of the building members, referring to the requirements of the International Building Code (IBC). As a general criterion for the limits of deflection of floors and roofs supported through the ceiling. Gypsum stipulation that deflection due to live load must not exceed span length divided by 360, which is consistent with the K-series joist specification in Section 5.9, which requires design deflection of floor since the live load must not exceed 1/360 of the span length of the floor. And for the roof, there are 2 limits set forth: the deflection must not exceed 1/360 of the span length when the gypsum cotton is suspended from the building frame. and deflection shall not exceed 1/240 of the span length for all other cases.
These limits will cause bends due to deflection to be within limits acceptable to the naked eye. Other considerations may be required to apply more stringent deflection limits, for example in The joint position between drywall partitions and a drywall or plaster ceiling, as per standard specs, will allow a deflection of 0.6 cm (1/4 in.) to 1.25. centimeters (1/2 inch) only, which is a more stringent limit than the limit mentioned above.
From the foregoing, it is talking about bending. in the downward direction of the building frame that supports the ceiling from above. In addition, the deflection of the floor must be considered as well. Because when deflection occurs on the floor, the partition will be pulled in the direction relative to the ceiling. events like this usually do not have to be considered a lot because the magnitude of deflection is caused by the difference in deflection of the floor between the upper and lower floors (except in the top and bottom floors).
Deflection of the floor is another thing to be considered. This deflection is related to The behavior of the interior partitions of a mezzanine floors warehouse as the floor is the support of the wall. Deflection that follows the deflection of the floor Walls can generally be considered to be very deep or diaphragm work, so they have a slight ability to extend across the entire space when the floor is deflection. The most vulnerable point of the wall is The upper corner of the door opening due to (1) the longitudinal contraction of the wall and (2) the discontinuity of the wall which causes the wall to behave like a beam. too and can be cracked by the wall Try to show behavior based on support deflection.
Therefore, in many cases, the solution to the problem of how structures and screens interact is to make a joint that separates the two. The recommendation is Joint control in the area located at the top corner of Doors and at intervals along walls that do not have a door through. The distance of the connection should be about 9 meters or narrower. Or limit the width to height ratio of the wall panel from 2 to 1 to 3 to 1.
