Interpretation of Silicone Structural Sealant Design

This article content is compiled by Siway editorial board:

When the plastic glue to ensure that the size and quality of adhesive, colloid should not have bubbles or holes! This issue we will introduce you to the silicone structure sealant seam size design and calculation!

The general requirements for the size of silicone sealant

According to JGJ102-2003 “glass curtain wall engineering technical specifications” of the relevant provisions of the design and calculation of silicone structural sealant width / thickness value, the size of its design requirements are as follows:

① width: greater than or equal to 7mm, less than or equal to 24mm;

② Thickness: greater than or equal to 6mm, less than or equal to 12mm

③ thickness ≤ width ≤ 2 times the thickness (single component) (two components are not recommended more than 2.5 times).

Design of Silicone Structural Sealant

1.1 silicone adhesive structure of the adhesive width Cs should be in accordance with the “glass curtain wall engineering technical specifications” JGJ102-2003 provides:

Non-seismic design, the first paragraph of paragraph 3 to calculate the larger value; seismic design, the first paragraph 2 and paragraph 3 to calculate the larger value.

(1), under the action of wind load, the bonding width CS should be calculated as follows:

Where W – the wind load design value (Kpa) on the calculation unit;

A – the short and long sides of the rectangular glass plate (mm)

F1 – silicone structural sealant in the wind load or earthquake under the strength of the design value, take 0.2N / mm2.

(2), under the wind load and horizontal earthquake, the bonding width CS should be calculated as follows:

Where W – the wind load design value (Kpa) on the calculation unit;

QE – the seismic action design value (Kpa) acting on the calculation unit

F1 – silicone structural sealant in the wind load or earthquake under the strength of the design value, take 0.2N / mm2.

(3), under the permanent load of glass, the bonding width CS should be calculated as follows:

Where qG – curtain wall glass unit area gravity load design value (Kpa);

A, b – are the short sides of the rectangular glass plate and the length of the long side (mm);

F2 – silicone structural sealant in the permanent load or earthquake under the strength of the design value, take 0.01N / mm2.

Design Technology of Silicone Structural Sealant Thickness

2.1 The thickness of the silicone adhesive adhesive tS (as shown below) should meet the requirements of formula (4):

Ts: silicone structural sealant adhesive thickness calculated value (mm);

Δ: silicone structural sealant displacement tolerance, take the corresponding tensile stress of 0.14N / mm2 when the elongation;

us: glass curtain wall with respect to the aluminum frame attached to the amount of displacement (mm), the relative displacement us1 according to the formula by the body to produce lateral structure (5) calculation; relative displacement us2 according to the formula by the temperature changes produced (6) calculation, Take the larger value in us1, us2.

(1) the relative displacement generated by the lateral displacement of the main structure us1 according to formula (5):

Us1: the main structure of the lateral shift, glass and glass frame with the relative displacement (mm);

Θ: the wind load under the standard value of the main structure of the interlayer displacement angle limit (rad);

Hg: curtain wall glass panel height (mm);

(2) the relative displacement of the temperature difference us2 according to formula (6):

Us2: under the effect of annual temperature difference between glass and glass frame relative displacement (mm);

B: the largest side of the glass plate (mm);

Δt: annual temperature difference: 80 ℃

A1: aluminum thread expansion coefficient, 2.3 × 10-5;

A2: glass linear expansion coefficient, 1 × 10-5;

Tensile curve of silicone structural adhesive

For the calculation of the thickness of the silicone structure of the rubber, the silicone structure of the deformation of the adhesive capacity of δ to silicone rubber manufacturers to provide, there is no δ ultra-high 20% silicone rubber.

In general, hidden wall curtain wall in addition to the use of silicone sealant in addition to the force should also take additional safety measures to extend the service life of structural adhesives to ensure the safety of hidden curtain wall.


Post time: Mar-07-2017
INQUIRY NOW
  • * CAPTCHA: Please select the Star