The frame and sash structure design of the Broken Bridge Casement Window improves the wind pressure resistance performance. In essence, it optimizes the force transmission path, enhances the structural rigidity, and strengthens the synergy of components to resist the damage or functional impact of wind load on the window as a whole. The practical significance of this design is reflected in multiple levels from basic support to detail coordination, which together build a complete system that can effectively resist wind pressure.
As the basis for connecting the window to the building wall, the structural design of the frame directly determines the bearing capacity of the entire window. If the profile cross-section design of the frame lacks sufficient rigidity, it is very easy to bend or twist under strong winds, which will cause the force balance of the entire window to be broken. Reasonable frame structures usually enhance the bending resistance by optimizing the cross-sectional shape, such as adopting a multi-cavity design, using the mutual support of the internal cavities to disperse stress, and avoid deformation due to excessive local force. At the same time, the combination of the insulation strip and the profile in the broken bridge structure is also crucial. The high-strength insulation strip is tightly connected to the profile through mechanical bite or composite process, which can not only block heat conduction, but also form a rigid support between the profiles to prevent the profiles from separating or dislocating under the action of wind pressure, ensuring that the frame as a whole bears the load and stably transmits the force to the wall.
As a movable part that directly bears wind pressure, the core of the structural design of the fan body is to reduce its own deformation and form effective coordination with the frame. When strong wind acts on the fan surface, the wind force will be converted into pressure or tension on the fan body. If the fan body profile is thin or the cross-section design is unreasonable, it is very easy to appear concave in the middle or warp at the edge, destroying the sealing fit with the frame, and even causing the connection between the fan body and the frame to loosen. The optimized fan structure often improves the deflection resistance by adding internal reinforcement ribs or adopting closed sections. The reinforcement ribs can disperse the stress generated by wind to the entire fan body, and the closed section uses the stability of the geometric shape to resist the bending moment, so that the fan body maintains its original shape when subjected to wind pressure, avoiding excessive deformation that affects the overall structural safety.
The connection between the frame and the fan is the force transmission hub, which directly affects the stability of the wind pressure resistance performance. The hinge or hinge of the broken bridge casement window is the key component connecting the two. Its material selection and installation structure must match the force requirements of the frame and fan. The hinge made of high-strength alloy material is connected to the frame and fan through an embedded or multi-point fixing method. It can withstand the tension or pressure transmitted by the fan body under the action of wind pressure, and avoid the connection point from breaking or loosening due to excessive force. The design of the locking system is equally important. The multi-point locking structure can tightly engage the fan body with the frame from multiple positions when the fan body is closed, so that the fan body is evenly stressed all around, avoiding the local pressure concentration caused by single-point locking - this concentration may cause the far end of the fan body to lift up under wind pressure, destroy the seal and aggravate structural deformation. The uniform pressure formed by multi-point locking can not only enhance the fit between the fan body and the frame, but also disperse the wind load to multiple parts of the frame, reducing the local force strength.
In addition, the cooperation between the frame-fan structure design and the sealing system also indirectly improves the reliability of wind pressure resistance. The effective work of the sealing strip depends on the close fit between the frame and the fan, and this fit requires the frame-fan structure to maintain a stable shape under wind pressure. If the frame or fan body is deformed, the strip may have gaps due to the loss of pressure, resulting in airflow penetration, and the impact of airflow will further aggravate structural deformation. The optimized frame-sash structure maintains its own rigidity and ensures that the rubber strip is always in a compressed state to form a continuous sealing barrier, which not only prevents air leakage, but also avoids secondary damage to the structure by airflow, thereby maintaining the stability of the overall wind pressure resistance.
From the perspective of overall force logic, the core of the frame-sash structure design is to build an efficient load transfer path. When wind acts on the window, the fan body first bears the load, and transmits the force to the frame through hinges and locking devices, and then the frame disperses the load to the main body of the building through the connection structure with the wall. The smoothness of this path depends on the structural strength and coordination of each component. If the connection between the frame and the wall is designed with reinforced lining steel or a reasonable installation slot is reserved, the fixing strength can be enhanced to prevent the frame from falling off the wall; if the connection parts between the fan body and the frame can accurately match the force direction of the two, the force loss can be reduced to ensure efficient load transfer. This force balance from the local to the whole is the deep meaning of the frame-sash structure design to improve the wind pressure resistance performance.
In short, the frame and sash structure design of the broken bridge casement window fundamentally improves the structural stability and functional integrity of the window under wind loads by strengthening the rigidity of each component, optimizing the force transmission path, and enhancing the coordination of connection and locking. This allows the window to maintain its own shape in a strong wind environment and effectively resist external force impacts, providing reliable protection for the interior of the building.
