Material selection and structural design standards for stone curtain walls

1、 Stone sealing should be designed according to the external enclosure structure, and the stone curtain wall slabs should be made of igneous rock.
2、 Natural stone curtain walls are not suitable for use in high-rise and super high-rise buildings. When required by the design, measures should be taken to prevent stone fragmentation.
3、 The skeleton of the stone curtain wall should be designed taking into account the building facade effect, civil structure form, and installation form of the stone curtain wall. It is necessary to ensure the safety and reliability of the curtain wall system, as well as the feasibility of the construction process.
4、 The stone curtain wall and its connecting components should have sufficient bearing capacity, stiffness, and displacement capacity relative to the main structure. The columns of the curtain wall skeleton should be connected to the main structure through metal corner brackets, and bolts should be used to connect the columns and corner brackets. The bolt pads should have anti loosening and anti slip measures.
5、 Stone curtain walls without seismic design shall not be damaged by wind force; The stone curtain wall designed for earthquake resistance can still be used after repair under the seismic fortification intensity; The curtain wall skeleton shall not fall off under rare earthquake action.
6、 When designing stone curtain wall components, full consideration should be given to the safety of the curtain wall system under the influence of gravity loads, wind loads, seismic effects, temperature effects, and displacement of the main structure.
7、 The internal forces and displacements of curtain wall components can be calculated using elastic methods and should comply with the following regulations:
1. Stress or bearing capacity
σ≤ f
Or S ≤ R
2. Displacement or deflection
U ≤ [u]
In the formula, σ - the design value of the maximum stress in the cross-section generated by the load or action;
F - Material strength design value;
S - maximum internal force design value of the section generated by load or action;
R - Design value of component section bearing capacity;
U - the maximum displacement or deflection generated by the standard value of the load or action;
[u] - allowable displacement or deflection value.
8、 When designing the ultimate bearing capacity limit state of stone curtain wall components, the combination of their functions should comply with the following regulations:
1. When there is no seismic effect combination, the following formula should be used:
S=γ GSGK+psi w γ wSWK+γ T psi TST
2. When there is a combination of earthquake effects, the following formula should be used
S=γ GSGK+psi w γ wSWK+psi E γ ESEK+γ T psi TST
In the formula, S represents the design value of the combination of action effects;
SGK - standard value of permanent load effect;
SWK - Standard Value of Wind Load Effect;
SEK - Standard Value of Seismic Effects;
ST - Standard Value of Temperature Effect;
ST - Standard Value of Temperature Effect;
γ G - Partial factor of permanent load;
γ W - Partial coefficient of wind load;
γ T - Partial coefficient of temperature effect;
γ E - Partial coefficient of seismic action;
ψ W - combination value coefficient of wind load;
ψ E - combination value coefficient of seismic action;
The combination value coefficient of temperature effect.