The basic points of Curtain Wall Design
On the base of the safe use of structures and frugality, the applicable structure responsible persons must rigorously control the quality of curtain wall accoutrements and master the crucial points of curtain wall design so that the construction quality of curtain wall can be guaranteed. So moment I would like to introduce to you common problems in curtain wall design.
Analysis of Common problems in Building Curtain Wall Design
Bedded corridor
Some structure engineering main bodies don't design bedded corridor, so they've to be remedied with expansion bolts and chemical bolts during construction. Still, because of bedded corridor specifications and sword price welding and Anchorage length, it's delicate to meet the conditions of the construction law.
Corridor of columns and shafts
The model of column mechanics computation is delicate to meet the requirements of practical engineering, in addition, the characteristic parameters of column and ray section aren't calculated directly or misemployed, and indeed some section shapes can't meet the conditions of force at all; some columns are indeed designed as contraction members, although the strength of the bar is checked but the stiffness of the member isn't checked. There are also some who don't check the computation according to the most inimical grid and the largest span.
Where the curtain wall is connected to the host
The strength of the weld of the support and plate doesn't meet the conditions of the construction law, and only one bolt is installed in the connection position, which makes the bending moment of the angle law too large and delicate to strengthen.
The fixed position of the plate
There's no type under the plate of the retired frame curtain wall, the distance of the pressure plate is too large, and the strength of the pressure plate itself can't meet the conditions of the construction law.
Fire and lightning protection corridor
The consistence of leakproof cotton used is delicate to meet the conditions of the construction law, while the leakproof partition is fairly thin, and the leakproof joint isn't strict enough, which leads to the failure to deal with the lightning protection joint in the telescopic position of the column.
the crucial points of control in the design of curtain wall
Because of the high professional conditions of architectural curtain wall design, it's frequently engineers who first put forward design ideas and design effect delineations in the design process; secondly, the specific design is organized by architectural decoration companies, which is characterized by spastic design process. Combined with practical work experience, the common problems and enhancement measures in curtain wall design are epitomized as follows.
Crucial points in the design of curtain wall as a whole
The curtain wall is the external structure of the structure, and its functions substantially include bearing the dead weight and the seismic action and wind cargo acting directly on it, because it doesn't partake the earthquake or cargo borne by the main structure, so the curtain wall should meet the ensuing conditions in design
1. It should have certain stiffness, bearing capacity, stability and relegation capacity relative to the main structure.
2. The connection between its members and columns and shafts can reliably transfer seismic and wind loads and the dead weight of curtain wall members.
3. The concrete strength grade of the main structure of the connection shouldn't be lower than C25 to insure the trustability of its connection with the main structure.
4. The connection between it and Anchorage must be safe and dependable, and leave room meetly, especially when it's necessary to determine its bearing capacity, physical tests should be carried out.
5. When the curtain wall is connected with the masonry structure, sword shafts and columns or corroborated concrete can be added to the main structure. Then, the featherlight stuffing wall isn't considered as the supporting structure of the curtain wall structure, because its distortion capacity and bearing capacity are fairly small.
6. Measures against Rain Water's leakage performance should be taken in curtain wall design, especially for some curtain wall systems with shutters and glass lighting roofs, special attention should be paid to the construction of structural complex corridor similar as connection with the fringe, roof pressing and so on. when it's plant that the sealing is bad and the material performance can't meet the conditions, timely rectification or relief should be carried out, and the water test ofanti-Rain Water leakage performance should be carried out subcaste by subcaste if necessary to help leakage.
Crucial points of structural design of curtain wall
1. The curtain wall structure must have sufficient capability to acclimatize and absorb relegation, so that the curtain wall members can be effectively averted from being damaged by the relegation caused by the vertical force of the main structure, and there's room for movement between the curtain wall factors and the columns and shafts.
2. In order to make the curtain wall deformable in its own aeroplane, a portable joint can be set up on each bottom of the post, which also makes it possible to move over and down the post.
3. The gap between the upper and lower column joints shouldn't be lower than 15 mm, so as to meet the conditions of the error of the column installation, the temperature distortion of the column, and the axial distortion of the main structure column bearing perpendicular cargo.
4. The column should be designed as an axial pressure or eccentric pressure member, and the construction system should choose the depended joint to hang at the upper end and the lower end to elect the common form that can be misshaped up and down, so as to reduce the adverse impact on safety when the column is designed to work under complete pressure. at the same time, it also prevents vertical cargo from bending.
Design points of Lightning Protection system for Curtain Wall
Through the setting of lightning protection system, curtain wall can effectively reduce the loss of particular and property caused by lightning. Through the scientific setting of the curtain wall lightning protection system, the ideal lightning protection effect of the curtain wall can be achieved, so as to help or reduce the particular injury and property loss caused by lightning striking the structure curtain wall. The setting of lightning protection system should follow the principle of safety and trustability, but also have a certain sense of advance, so as to make a technologically advanced structure curtain wall lightning protection system. In the lightning protection design of the structure curtain wall, we should also make full use of the lightning connectors, down cables and grounding bias of the structure, through the scientific operation of these bias to realize the connection of the perpendicular ship, the vertical ship and the structure lightning protection net of the structure curtain wall. eventually, a fairly perfect total of lightning protection is constructed. Through this design, the huge quantum of electricity caused by lightning can be snappily transmitted to the ground, therefore guarding the structure curtain wall from lightning damage. In the design of the structure curtain wall, utmost of the cover plate of the structure curtain wall is designed as the curtain wall lightning connector, which makes the lightning current entered by the curtain wall lightning connector can be led down through the lightning equating ring and lightning protection of the curtain wall. safely lead the lightning current to the lightning protection net of the structure, so as to achieve a more ideal lightning protection effect.
Crucial points in the design of curtain wall
1. the curtain wall is a interchangeable structure, and the service life of the structural design isn't lower than 25 times. The bedded corridor aren't easy to replace and should be considered according to 50 times. The structural design service life of long- span and large-scale supporting sword structure should be considered according to the main structure.
2. rightly understand and apply the norms and morals. The standard is the summary of mature experience, not the prospect of new technology. The specification doesn't limit the operation of new technologies.
3. The safe selection of glass is a crucial problem in curtain wall design and structural design. Different types of safety glass and different parcels should be named according to the different conditions of different corridor.
4. Curtain wall energy saving has come an important part of structure energy saving in our country. The energy- saving design of curtain wall should consider the thermal sequestration design in downtime in cold areas, cold areas and mild areas, and the thermal sequestration design in hot summer and cold downtime areas and hot summer and warm downtime areas. In the design, it should be considered that the energy- saving effect of separating glass is much lesser than that of single- subcaste glass. Espousing the structural form of heat- breaking curtain wall is the most effective way to save energy in curtain wall structures.
All by each, in the design of curtain wall engineering, we should choose those largely good professional companies, so as to insure that the design can achieve a further ideal effect. In addition, in order to ameliorate the design position of the curtain wall, it's necessary to rigorously review the design inspection of the curtain wall design, and eventually insure the structural safety of the curtain wall design through the perpetration of the applicable computation and structural design of the curtain wall. to achieve a more ideal function. In order to achieve a good curtain wall design effect, it's necessary to strengthen the control of design, material selection, manufacture and installation, and eventually achieve the ideal curtain wall engineering quality through the strict control of the whole process of curtain wall product.
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