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The main content of the original text is to share the content of the project on adding elevators to the basement opening.
Therefore, the opening reinforcement design should be carried out for the floor slab after opening.
Generally speaking, if the width of the opening is not greater than 300mm and the cut reinforcement is not greater than 5%, reinforcement treatment may not be carried out.
The reinforcement treatment of cast-in-place floor slabs with openings needs to comprehensively consider factors such as the form of the floor slab, the size of the opening, and the position of the opening.
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The foundation of the steel column is planned to adopt the method of thickening the existing waterproof bottom plate to avoid the adverse effects on structural safety and waterproofing caused by breaking the original bottom plate of the garage.
The basic principle of the reinforcement and renovation of this project is to carry out reasonable seismic reinforcement of the original structure on the basis of completing the new building to ensure that the overall and local stiffness and strength of the original structure after reinforcement meet safety requirements.
After opening the opening, the original force transmission path and reinforcement are partially cut off, inevitably leading to an increase in the internal force of the plates around the opening, causing stress concentration, and cutting off the steel bars inside the plate, resulting in a decrease in bearing capacity.
According to the current national standard “Design Code for Concrete Structure Reinforcement” GB50367-2013, the main reinforcement methods include steel bonding reinforcement, increasing the cross-section method of the slab surface reinforcement, pasting fiber cloth reinforcement, and adding edge beams to the opening reinforcement.
This type of steel frame structure is more conventional and will not be further elaborated here.
Recently, the preface has made a new project for the reinforcement and transformation of existing residential areas, and takes this opportunity to share with you and discuss the specific design process of such transformation projects.
Considering the advantages of light weight, fast construction, and cost saving of steel structures, in order to minimize the impact on the original structure and foundation, the new elevator structure adopts a steel frame form (see the figure below).
Figure 1 Elevator Structure Layout: Adding an elevator in the basement inevitably requires opening the existing floor slab.
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If the width of the opening is not more than 1000mm and the cut reinforcement is not more than 20%, steel bonding or fiber cloth bonding can be used for reinforcement (usually double-sided reinforcement)
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The method of adding elevators is nothing more than opening holes in the floor slab and adding elevator structures.