3.2, stone calculation
The calculation of stone material mainly includes the bending calculation of the plate plate itself and the calculation of shear resistance at the connection between the hanging plate and the hanging piece pin. Sometimes the thermal crack stress of the stone should be calculated. The calculation method is related to the dry hanging way of stone. This paper describes the fixed system of dry hanging stone with back bolt. The load of stone plate consists of horizontal wind load and seismic load, vertical seismic load and stone weight. And the thermal crack stress produced by the change of temperature. Back bolt dry hanging stone installation system typically through the next 2 groups (4 groups) will be fixed in stone stone pendant, pendant group above two supporting the weight of the stone material and in the direction perpendicular to the plane of the stone stone constraint function, the two group was below the pendant stone in the vertical constraint on the stone plane direction.
When the stone is calculated for bending, the stress should be calculated according to the four point support plate. The calculation of length A0, b0. the maximum bending stress bending strength design value should not exceed the design value of stone plate; back bolt Pendant in stone plate on the shear stress shear calculation, according to the relevant empirical formula calculation requirements slate shear stress value is not standard the plate is greater than the design value of shear strength. It should be noted that the vertical shear stress is only carried by the two groups of pendants, not by all four groups of pendants. 3.3 dry hanging stone curtain wall project in system design, design of dry hanging system to complete the general independent by the construction unit curtain wall as stone, due to the characteristics of suspension system, design of dry hanging system determines the structure of the safety curtain wall, has a special significance, but because it belongs to the concealed work, especially should be enough pay attention to.
3.3. The transmission of the strength of the dry hanging stone system?
The maximum stress in a sheet can be calculated by a simplified calculation method or by a meta program. It is worth emphasizing that some special stones have different factory strength in the direction of plate length and plate height due to their unique texture characteristics. These two different strength directions must be calculated separately. In addition, the stress in the vertical direction must be calculated while calculating the maximum stress in a certain direction at a certain point.
3.4, the allowable stress of the stone
According to the physical properties test of the previous stone, the corresponding stone strength index can be obtained. Granite, marble and limestone are commonly used for building dry hanging stones. According to the specific performance characteristics and construction experience of all kinds of stones, the safety factors for the above stones should be different. The industrial associations of various stones in the United States give the recommended safety factors for the corresponding stones. For limestone, the value of the design safety department recommended by the limestone industry in the United States is 8. The allowable stress can be obtained by dividing the bending strength and compression strength of the experimental stone by the corresponding design safety factor.
3.5, the calculation of the bending resistance of the stone plate itself
For anisotropic stone, the calculation of the bending resistance of the plate position is divided into two cases. One is the point where the maximum bending stress occurs in the stone plate, and the stress in the other direction is zero. As long as the maximum stress is smaller than the allowable stress in the corresponding direction, the bending property of the stone plate satisfies its requirements, otherwise, it is not satisfied. The two point is that the point of maximum bending stress in the stone plate is divided into two cases, for the anisotropic stone, and the calculation of the bending resistance of the stone plate position.
One is the point where the maximum bending stress occurs in the stone plate, and the stress in the other direction is zero. As long as the maximum stress is smaller than the allowable stress in the corresponding direction, the bending property of the stone plate satisfies its requirements, otherwise, it is not satisfied.
The two is the point in which the maximum bending stress occurs in the stone plate.
3.6, stone cutting check calculation at pin hole
According to the geometric parameters such as the depth of the pin hole, the thickness of the stone plate, the geometric parameters such as the depth of the pin hole, the thickness of the stone plate, etc., are calculated, otherwise, it is not satisfied.
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