The new high-rise I structure elevator of the medical technology building of Zhejiang First Hospital and the design of Cai Yingtian (Hangzhou Architectural Design and Research Institute 'Hangzhou 310001) measures. Project Overview 2.2 Structural Scheme 2 The first floor of the Medical Technology Building of the First Affiliated Hospital of Zhejiang University School of Medicine has 1 floor underground, 22 floors above ground and a roof height of 75m. It is a comprehensive building integrating medical treatment, scientific research and hospitalization. The plane of the building is trapezoidal, with a width of 58.2m on the north, 66.4m on the south, and a depth of i5.3m. The existing reinforced concrete frame shear wall structure system is used. The reinforced concrete elevator shaft of the building is located at the second openings at both ends of the north side. In order to make the center of the lateral stiffness of the structure and the center of the horizontal acting force close to coincide, a reinforced concrete shear wall was also set up on the south side of the elevator shaft of the building. The project was completed in 1999 and put into use. Due to the large number of people entering and leaving the building, the original five elevators were located at both ends of the building, and the speed of the medical elevator was slower, causing passengers to wait too long, affecting efficiency. The court decided to add 4 high-speed elevators, and requested that the normal use of the building not be affected as much as possible during construction. 2 The choice of plan is not to reduce the use area of ​​the original building, and does not affect the normal use of the building. From the perspective of the rationality of the use function, the new elevator should be arranged near the original elevator hall. After the demonstration, two elevators were added on the north side of the two original elevator shafts. 2.1 The first structural scheme adopts cast-in-place reinforced concrete elevator shaft, which has the advantages of good structural rigidity and low cost. The disadvantage is that the structure is self-important, the construction period is long, and the construction requires the installation of tower cranes or derricks for vertical transportation, which is necessary Attached to the outer wall of the original building, this will destroy the outer wall of the new building. In addition, considering the structural system, if the new reinforced concrete elevator shaft is separated from the building with seismic joints, the height-to-width ratio of the elevator shaft is too large to meet the structural anti-overturn requirements; if the elevator shaft is connected to the main body, Due to the increased load and stiffness of the newly added structure, the connection nodes of the new and old structures are more difficult to handle, especially after the elevator shaft is connected to the main body, the stiffness center of the building's lateral force structure is offset, and some frame beams and columns are calculated empirically The cross-section and the reinforcement of the can't meet the requirements yet. Therefore, the use of reinforced concrete structure cylinder is not suitable for this project. The steel shaft elevator shaft is used, which has the advantages of light weight, easy installation, and fast construction speed. Due to its light weight and low rigidity, it has little impact on the structure after being connected to the original building, and meets the requirements of seismic design. The disadvantage is that it is used as an elevator. Due to its small stiffness, the structure of the shaft is deformed greatly under the action of horizontal load, and the nodes or structural measures are improper. The deformation of the structure will affect the normal use of the elevator. Based on the analysis of several used steel elevator shafts provided by the elevator factory, the high-rise steel elevator shaft lacked the necessary support system, which caused its deformation to exceed the normal operating limit of the elevator under heavy wind load. not in service. Therefore, when the steel structure is selected as the elevator shaft of a high-rise building, measures should be taken to improve its resistance to deformation and meet the requirements of the normal operation of the elevator. 3 Steel structure elevator shaft design 3.1 Structural layout After consultation with the construction professional, use the elliptical plane elevator shaft, such as. The advantage of this plane is that the rectangular elevator shaft is combined with the oval building shape. The smallest plane size not only meets the functional requirements, but also provides conditions for improving the structural plane rigidity. The effect of the completed facade is also perfect. From the structural point of view, the shape factor of this shape wind carrier is small, which reduces the influence of wind load on the structure. Using the space between the rectangular shaft and the elliptical shape to set the horizontal steel truss improves the plane rigidity of the structure. The horizontal standard truss structure of horizontal steel truss machined in the factory is used as the supporting point of the stiffness of the stone curtain wall, which solves the difficulty of positioning the elliptical shape at high altitude. In order to improve the horizontal displacement resistance of the newly added elevator shaft, the steel structure shaft and the original concrete cylinder are connected by box-shaped steel beams, and some floors of the connecting body are made of cast-in-place steel-reinforced concrete structure, which changes the new and old structural layers The bit remains consistent. 3.2 The structure is vertically arranged. Six steel composite columns are set at the corners of the rectangular elevator shaft as the main load-bearing members. The elliptical outer wall is provided with shaped steel columns to bear the curtain wall load. The internal and external steel columns form a vertical steel truss. A vertical continuous scissors brace is set between the steel column and the beam of the shaft wall to improve the horizontal resistance of the steel structure itself. 3.3 Structural analysis According to the "Technical Specification for Steel Structures of High-Rise Civil Buildings (JGJ 99-98)", this project is a category B building with 6-degree fortification, and the earthquake action should be calculated according to the local fortification intensity (6 degrees), but it may not be carried out. Structural calculation under the action of rare earthquakes. Therefore, this project can be designed in the first stage according to the calculation of earthquake action of frequent earthquakes to check the bearing capacity, stability and interlayer displacement of the structure. According to "Regulations for Structural Design and Construction of Reinforced Concrete High-Rise Buildings (JGJ3-91)", Class B buildings and buildings on the I-DI site at 6-degree fortification do not have to calculate the seismic effect. Consider the new elevator shaft and the original building as a whole. Obviously, the new part is very small relative to the original structure in terms of quality and structural rigidity. Even if the dynamic analysis is performed according to the overall structure, the dynamic characteristics of the original structure are very affected. small. Therefore, this project will use the newly added steel structure as a part of the original structure for static calculation. Use the STAAD-ID structural analysis of the American REI company: analysis program to check the bearing capacity, stability and interlayer displacement of the steel structural members. The calculation is based on two cases: Case 1 is the wind load + bearing horizontal to horizontal displacement, the displacement value is the displacement of each layer of the original structure, * 2 the displacement direction is consistent with the wind load direction; Case 2 is the wind load when the horizontal displacement of the bearing is zero The internal force under action mainly considers the effect of local wind pressure. Judging from the calculation results, the nodes connected to the original structure need to bear a larger horizontal load. 3.4 Node design From the perspective of the overall structure, it is hoped that the impact of the steel structure elevator shaft on the original structure will be as small as possible. For the steel structure elevator shaft, attaching to the original structure can ensure the stability and overall deformation of the structure to meet the use requirements, and the local deformation of the steel structure needs to be solved by its own structural measures. The connection node of this project and the original structure concrete cylinder is treated as hinges (), considering that the steel structure column has a small cross section and a large compression deformation. This node also allows a certain vertical displacement of the steel beam at the node. Due to the large horizontal force of the joints, in order to ensure the safety and reliability of the joints, the wall bolts are used to connect with the concrete wall. The steel column and the steel beam are connected rigidly, the diagonal brace is connected with the joint plate and the beam column joint, and the connection between the steel column foot and the foundation is also hinged (exposed hinged foot). Treatment of simplified connection nodes of the original structure 4 Foundation design According to the structural load and the feasibility of construction, large-diameter bored cast-in-place piles are used, and the weathered bedrock is used as the bearing layer to effectively reduce the foundation settlement. In this project, three wells 00 cast-in-place bored piles are used under each wellbore, and the bearing center of the pile basically coincides with the center of gravity of the wellbore load. Since the newly added elevator shafts are generally required to be set close to the original building, the minimum spacing required for construction should be considered when arranging large-diameter bored piles. Generally, the center is required to be more than 1.5m away from the external wall of the building. 5 Fire protection and anti-corrosion treatment The fire protection of the newly added steel structure elevator shaft is not specified in the specification. After consulting the fire department, it is considered that there is no combustible body in the elevator shaft, and it is not a fire elevator. Therefore, the focus of fire prevention can be placed on each floor. Fireproof materials are used on the side wall of the elevator door. Automatic sprinklers are installed in the shaft and in the new elevator hall. The anti-corrosion treatment of the steel structure is also the focus of the construction. The external wall of this project uses dry-hanging granite. The external surface of the granite requires anti-seepage treatment. The joints are sealed with sealant to prevent water seepage from the wall. Make good ventilation in the shaft to keep the surface of the steel structure dry. The anti-corrosion degree of the steel structure members of this project shall be painted with silver powder after the on-site installation is completed, and the electric welding joint shall be the focus of treatment. 6 Summary (1) The weight and stiffness of the newly added structure should be considered when the elevator shaft is added after the building is built, and the overall dynamic analysis should be done when the reinforced concrete cylinder is used. (2) When adopting the elevator shaft of steel structure, it should be considered that the structure plane has sufficient rigidity. When designing a node, you should ensure the safety and reliability of the node, especially the connection node with the original structure. The beauty of the Purple Sand Flowerpot lies in its unique decorative means. 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