CN115828367A - Super high-rise building wind-resistant design method and device based on adjustment of core tube opening - Google Patents
Super high-rise building wind-resistant design method and device based on adjustment of core tube opening Download PDFInfo
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- CN115828367A CN115828367A CN202211334479.3A CN202211334479A CN115828367A CN 115828367 A CN115828367 A CN 115828367A CN 202211334479 A CN202211334479 A CN 202211334479A CN 115828367 A CN115828367 A CN 115828367A
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Abstract
The invention discloses a method and a device for designing wind resistance of a super high-rise building based on adjustment of core tube opening, wherein the method comprises the following steps: establishing a super high-rise structure model according to the primary building model and the building plane; obtaining structural parameters of the super high-rise structure model under the existing load condition; adjusting the position and size of the opening of a core tube of the super high-rise structure model, and changing the original openings of the core tube which are symmetrical along the axis into diagonal symmetry on the premise of not changing the total area of the opening of the core tube, so that the structural modal shape deflects to obtain the adjusted super high-rise structure model; and obtaining the wind vibration response of the adjusted super high-rise building model under different wind speed conditions by adopting the adjusted structural parameters of the super high-rise structure model and combining the accurate wind load obtained by a wind tunnel test, wherein the wind vibration response comprises a roof combined acceleration peak value and a vibration track. The invention can reduce the resultant acceleration peak value by about 20% in the most severe wind speed range of vortex-induced vibration, and improve the living comfort.
Description
Technical Field
The invention relates to the technical field of wind resistance of super high-rise buildings, in particular to a wind resistance design method and device of a super high-rise building based on adjustment of core tube opening.
Background
The cross wind-induced vibration caused by periodic vortex shedding not only causes the increase of the wind load of structural design, but also brings performance problems related to living comfort, and is a main challenge in super high-rise building design. The pneumatic optimization method (improving the aerodynamic appearance of a building) and the structural optimization method (enhancing the structural rigidity or arranging an additional damping device) are two main means for controlling the transverse wind direction response of the super high-rise building at present. However, in practical engineering, the existing wind-resistant design method still has some inevitable problems:
1) The used space of the building is reduced: most methods for improving the aerodynamic shape of a building, such as re-entrant corners, chamfers, coning, etc., result in a reduction in the space available for the building, and the provision of additional tuned mass damper devices may result in the building roof having certain floors that may need to forego their own functionality to provide space for damper installation and oscillation.
2) Increase the construction degree of difficulty and cost: the method for integrally twisting the building can effectively reduce the crosswind wind load, but can increase the difficulty of structural design (such as inclined columns and the like) and the difficulty of curtain wall design (curved surface), thereby increasing the construction cost.
3) Contradictory to the architectural concept: architects may focus primarily on architectural aesthetics in project design, with less consideration for aerodynamic effects. Structural engineers often have little, if any, discussion regarding the aerodynamic performance of the building in relation to the architect, and the resulting building plan is often the result of a communicative coordination of the aesthetic and aerodynamic plans of the building. Aerodynamic solutions minimize cross-wind loading and wind vibration response, but may not be suitable for the surrounding environment and/or may contradict building concepts. In practical engineering, this is often the main reason why a building does not adopt a pneumatic optimization method even if it is subjected to strong cross-wind loads.
4) It is possible to increase the normal wind response: the existing pneumatic optimization method, such as coning, can effectively reduce wind vibration response under the designed wind speed, but can increase wind-induced response under normal wind, and plays an opposite role in living comfort in daily use.
Disclosure of Invention
According to the embodiment of the invention, the invention provides a super high-rise building wind resistance design method based on adjustment of core tube opening, which comprises the following steps:
establishing a super high-rise structure model according to the primary building model and the building plane;
obtaining structural parameters of the super high-rise structure model under the existing load condition;
adjusting the position and size of the opening of a core tube of the super high-rise structure model, and changing the original openings of the core tube which are symmetrical along the axis into diagonal symmetry on the premise of not changing the total area of the opening of the core tube, so that the structural modal shape deflects to obtain the adjusted super high-rise structure model;
and obtaining the wind vibration response of the adjusted super high-rise building model under different wind speed conditions by adopting the adjusted structural parameters of the super high-rise structure model and combining the accurate wind load obtained by a wind tunnel test, wherein the wind vibration response comprises a roof combined acceleration peak value and a vibration track.
Further, the super high-rise building model is built through structural calculation software.
Further, the adjusted structural parameters of the super high-rise building model comprise: actual mass distribution, frequency and mode shape.
Further, the different wind speed conditions include: the wind speed control system comprises a subcritical wind speed less than a vortex-induced vibration critical wind speed, a transcritical wind speed equal to the vortex-induced vibration critical wind speed and a supercritical wind speed greater than the vortex-induced vibration critical wind speed.
Further, the adjusted vibration track of the super high-rise building model presents an elliptical track which is closer to a circle.
According to another embodiment of the present invention, there is provided a wind resistance design device for super high-rise buildings based on adjustment of opening of a core tube, including:
the building module is used for building a super high-rise structure model according to the primary building model and the building plane;
the acquisition module is used for obtaining the structural parameters of the super high-rise structure model under the existing load condition;
the adjusting module is used for adjusting the position and the size of the opening of the core tube of the super high-rise structure model, and on the premise that the total area of the opening of the core tube is not changed, the hole openings of the core tube which are originally symmetrical along the axis are symmetrical along the diagonal line, and the structural modal shape deflects to obtain the adjusted super high-rise structure model;
and the calculation module is used for obtaining the wind vibration response of the adjusted super high-rise building model under different wind speed conditions by adopting the adjusted structural parameters of the super high-rise structure model and combining the accurate wind load obtained by a wind tunnel test, wherein the wind vibration response comprises a roof combined acceleration peak value and a vibration track.
Further, the super high-rise building model is built through structural calculation software.
Further, the adjusted structural parameters of the super high-rise building model comprise: actual mass distribution, frequency and mode shape.
Further, the different wind speed conditions include: the wind speed control system comprises a subcritical wind speed less than a vortex-induced vibration critical wind speed, a transcritical wind speed equal to the vortex-induced vibration critical wind speed and a supercritical wind speed greater than the vortex-induced vibration critical wind speed.
Further, the adjusted vibration track of the super high-rise building model presents an elliptical track which is closer to a circle.
According to the method and the device for designing the wind resistance of the super high-rise building based on the adjustment of the core tube opening, the problems of the existing wind resistance design method can be effectively solved, the peak value of the resultant acceleration can be reduced by about 20% in the most severe wind speed range of vortex-induced vibration, the wind vibration acceleration of the building can be reduced in the subcritical wind speed range (in a daily use state), and the living comfort is improved. The invention has the unique advantages that the core tube is octagonal or the vibration mode is deflected due to factors such as opening of a vertical surface and the like, the local design wind pressure is larger, the main wind direction is opposite to the vertical surface of the building, the aerodynamic characteristics of the building are poor, the building shape is not required to be changed, the vibration reduction effect realized by a common damper can be achieved, no additional space is required to be utilized, and the structure adjustment is more convenient and faster compared with the design method of a common reinforced structural member. The invention can be used as an effective supplement to the existing structure wind-resistant design method.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology.
Drawings
FIG. 1 is a design flow chart of a conventional wind resistance design method
FIG. 2 is a floor plan and structural modal orientation of a typical super high-rise building structure
FIG. 3 is a schematic diagram of wind direction angle of a typical super high-rise building structure with single-mode transverse wind direction vibration
FIG. 4 is a floor plan and structural mode orientation of a super high-rise building structure of the present invention
FIG. 5 is a schematic view of the wind direction angle of the super high-rise building structure of the present invention generating single-mode transverse wind vibration
FIG. 6 is a schematic view of a typical super high-rise building structure showing a roof resultant acceleration curve
FIG. 7 is a rooftop resultant acceleration profile of the super high-rise building structure of the present invention
FIG. 8 is a graph of vibration traces for a typical super high-rise building structure at different wind speeds
FIG. 9 is a vibration trace diagram of the super high-rise building structure of the present invention at different wind speeds
Fig. 10 is a flow chart of a method for designing wind resistance of a super high-rise building based on adjustment of core tube opening according to an embodiment of the invention.
Fig. 11 is a structural block diagram of the wind-resistant design device for the super high-rise building based on adjustment of the core tube opening in the embodiment of the invention.
Detailed Description
The present invention will be further explained by the following detailed description of preferred embodiments thereof, which is to be read in connection with the accompanying drawings.
Firstly, a method for designing wind resistance of a super high-rise building based on adjustment of core tube opening according to an embodiment of the invention will be described with reference to fig. 4~5 and 7 to 10, and the structural mode vibration mode deviates from the worst wind direction angle of the building appearance by adjusting the position and size of the core tube opening of the super high-rise building, so that a plurality of structural modes are excited to jointly participate in vibration under the action of transverse wind direction vortex-induced aerodynamic force, and the vortex-induced response resultant amplitude is smaller than the vortex-induced amplitude of a single mode. The basic principle of the method is aerodynamic decomposition effect and non-synchronous peak effect, the method is an effective supplement of the existing wind-resistant design method, and the application scene is wide.
As shown in fig. 10, the method for designing wind resistance of a super high-rise building based on adjusting the opening of the core tube according to the embodiment of the present invention includes the following steps:
s1, establishing a super high-rise building model according to the preliminary building model and the building plane, wherein in the embodiment, the super high-rise building model is established through structure calculation software (namely a building structure calculation module 2.0.3 in the Ministry of construction).
S2: and obtaining the structural parameters of the super high-rise structural model under the existing load condition. The existing load conditions comprise earthquake loads and standard wind loads.
S3: and adjusting the position and the size of the opening of the core tube of the super high-rise structure model, changing the original openings of the core tube which are symmetrical along the axis into the diagonal symmetry on the premise of not changing the total area of the opening of the core tube, and deflecting the structural modal shape to obtain the adjusted super high-rise structure model. In this embodiment, the adjusted structural parameters of the super high-rise building model include: actual mass distribution, frequency and mode shape. In most of super high-rise buildings at present, the main symmetry axis direction of a structural system is consistent with the main symmetry axis direction of the building appearance, namely, the pneumatic direction of the building is consistent with the structural mode direction (as shown in fig. 2), so the cross wind direction vortex-induced vibration problem of the buildings only relates to a single side-shift mode or two side-shift modes with very close frequencies, and the worst wind direction angle of the buildings is when wind blows in the direction opposite to the building facade (as shown in fig. 3), at the moment, due to the pneumatic characteristic of a square section, the air flow can bypass the building to generate a violent vortex shedding phenomenon, so that extremely strong cross wind direction wind vibration response is caused. The invention makes the structural mode vibration type deviate from the worst wind direction angle of the building appearance and face the diagonal direction of the building (as shown in figure 4) by adjusting the position and the size of the opening of the core tube of the super high-rise building. Under the condition, when wind blows over the facade of the building, not only the first-order modal response is excited, but also the second-order modal response is excited, and bimodal vortex-induced vibration occurs, wherein the first-order modal response and the second-order modal response are approximately equal, but the wind speed corresponding to the maximum response is different. Due to the aerodynamic decomposition effect and the asynchronous peak effect, the maximum value of the combined acceleration of wind vibration at the top of the structure is between the wind speeds corresponding to the first-order modal response and the second-order modal response, and the peak value of the combined acceleration is close to the envelope of the two modal peaks, so that the wind-induced vibration is reduced. In this case, if a single-mode transverse wind vibration occurs, the wind should blow along the diagonal of the core tube, and the corresponding building shape becomes a rhombus (as shown in fig. 5). Since the diamond shape is closer to a streamline shape, it can be known that the transverse wind direction excitation caused by the diamond shape is far smaller than that of the square shape based on the principle of fluid separation.
S4: and obtaining the wind vibration response of the adjusted super high-rise building model under different wind speed conditions by adopting the adjusted structural parameters of the super high-rise structure model and combining the accurate wind load obtained by a wind tunnel test, wherein the wind vibration response comprises a roof combined acceleration peak value and a vibration track. In the present embodiment, the conditions of different wind speeds include: the wind speed control system comprises a subcritical wind speed less than a vortex-induced vibration critical wind speed, a transcritical wind speed equal to the vortex-induced vibration critical wind speed and a supercritical wind speed greater than the vortex-induced vibration critical wind speed. The vibration track of the adjusted super high-rise building model presents an elliptical track which is closer to a circle.
The acceleration response of the first mode and the acceleration response of the second mode of the typical super high-rise building are very different, the transverse wind direction response (the first mode) is obviously larger than the downwind direction response (the second mode), and the total acceleration value is completely controlled by the acceleration response of the first mode. The acceleration response of the first mode and the second mode of the structural system of the invention is relatively close, the maximum acceleration response respectively occurs at two different wind speeds corresponding to each mode, and the wind speed with the maximum resultant acceleration is positioned between the two modes. The invention can reduce the resultant acceleration peak value by about 20% in the most severe wind speed range of vortex-induced vibration, and can reduce the wind vibration acceleration of about 10% of buildings in the subcritical wind speed range (in a daily use state), thereby improving the living comfort.
The vibration trajectories of a typical super high-rise building in the subcritical (wind speed less than the vortex-induced vibration critical wind speed), transcritical (vortex-induced vibration critical wind speed) and supercritical (wind speed greater than the vortex-induced vibration critical wind speed) wind speed ranges are flat ellipses (as shown in fig. 8), and the transverse wind direction wind vibration acceleration of the first mode obviously far exceeds the downwind direction wind vibration acceleration of the second mode. However, since the maximum resultant acceleration in each direction needs to be considered in the design, the maximum resultant acceleration of a typical super high-rise building obtained by the acceleration combination method is also consistent with the wind vibration acceleration in the cross wind direction. The vibration trajectory of the super high-rise building in three wind speed ranges shows an ellipse (as shown in fig. 9) which is more approximate to a circle, and the structure system of the invention simultaneously excites a first mode and a second mode of the structure under the action of wind, so that the participation of the second mode in wind-induced vibration is obviously increased, the contribution of the first mode is reduced, and the maximum resultant acceleration is obviously reduced.
It should be noted that, for a conventional super high-rise building, the wind speed is generally in the sub-critical wind speed range (in the case of fig. 8a and fig. 9 a), and the transcritical and supercritical conditions mainly occur in few extreme cases, such as particularly high design wind speed, very low natural frequency of the structure, and narrow building width. In this case, the design wind speed has exceeded the fundamental mode vortex-induced resonant wind speed, and while the worst wind-induced response may occur below the design wind speed, the maximum wind vibration response still occurs at the vortex-induced resonant wind speed, and the structural system of the present invention is still effective.
Because the invention only optimizes the internal structure system of the building, the change of the building shape can not be caused, thereby effectively avoiding the problems that the use space of the building is reduced, the construction difficulty and cost are increased and the contradiction with the building concept is caused by adopting a pneumatic optimization method in the existing wind-resistant design method. Compared with the method for enhancing the structural rigidity or arranging the additional damping device in the existing wind-resistant design method, the method has the advantages that the structural member is adjusted relatively less, and no extra space is occupied. In addition, due to the aerodynamic force decomposition effect and the asynchronous peak effect, the wind vibration response during vortex-induced vibration and the wind-induced response under normal wind can be reduced simultaneously.
As shown in fig. 11, according to another embodiment of the present invention, there is provided a wind-resistant design apparatus for super high-rise buildings based on adjusting the opening of a core barrel, including:
the building module 100 is used for building a super high-rise structure model according to the primary building model and the building plane;
the acquisition module 200 is used for obtaining the structural parameters of the super high-rise structure model under the existing load condition;
the adjusting module 300 is used for adjusting the position and the size of the opening of the core tube of the super high-rise structure model, and on the premise that the total area of the opening of the core tube is not changed, the original hole of the core tube which is symmetrical along the axis is changed into the hole which is symmetrical along the diagonal line, and the structural modal shape deflects, so that the adjusted super high-rise structure model is obtained;
and the calculating module 400 is used for obtaining the wind vibration response of the adjusted super high-rise building model under different wind speed conditions by adopting the adjusted structural parameters of the super high-rise structure model and combining with the accurate wind load obtained by the wind tunnel test, wherein the wind vibration response comprises a roof combined acceleration peak value and a vibration track.
Further, the super high-rise building model is built through structural calculation software.
Further, the adjusted structural parameters of the super high-rise building model comprise: actual mass distribution, frequency and mode shape.
Further, the wind speed conditions include: the wind speed control system comprises a subcritical wind speed less than a vortex-induced vibration critical wind speed, a transcritical wind speed equal to the vortex-induced vibration critical wind speed and a supercritical wind speed greater than the vortex-induced vibration critical wind speed.
Further, the vibration track of the adjusted super high-rise building model presents an elliptical track which is closer to a circle.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The method and the device for designing the wind resistance of the super high-rise building based on adjusting the core tube opening according to the embodiment of the invention are described above with reference to fig. 1 to 11, and the method and the device can effectively solve the problems of the existing wind resistance design method, reduce the resultant acceleration peak value by about 20% in the wind speed range with the most severe vortex-induced vibration, reduce the wind vibration acceleration of the building in the subcritical wind speed range (in a daily use state), and improve the living comfort. The invention has the unique advantages that the core tube is octagonal or the vibration mode is deflected due to factors such as opening of a vertical surface and the like, the local design wind pressure is larger, the main wind direction is opposite to the vertical surface of the building, the aerodynamic characteristics of the building are poor, the building shape is not required to be changed, the vibration reduction effect realized by a common damper can be achieved, no additional space is required to be utilized, and the structure adjustment is more convenient and faster compared with the design method of a common reinforced structural member. The invention can be used as an effective supplement to the existing structure wind-resistant design method.
It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A super high-rise building wind-resistant design method based on adjustment of core tube opening is characterized by comprising the following steps:
establishing a super high-rise structure model according to the primary building model and the building plane;
obtaining the structural parameters of the super high-rise structure model under the existing load condition;
adjusting the position and size of the opening of the core tube of the super high-rise structure model, and changing the original openings of the core tube which are symmetrical along the axis into the diagonal symmetry on the premise that the total area of the opening of the core tube is not changed, so that the structural modal shape deflects to obtain the adjusted super high-rise structure model;
and obtaining the wind vibration response of the adjusted super high-rise building model under different wind speed conditions by adopting the adjusted structural parameters of the super high-rise structure model and combining the accurate wind load obtained by a wind tunnel test, wherein the wind vibration response comprises a roof combined acceleration peak value and a vibration track.
2. The wind-resistant design method for super high-rise buildings based on adjustment of core tube holing as claimed in claim 1, wherein the super high-rise building model is established by structural calculation software.
3. The method for designing the wind resistance of the super high-rise building based on the adjustment of the core tube opening according to claim 1 or 2, wherein the structural parameters of the adjusted super high-rise building model comprise: actual mass distribution, frequency and mode shape.
4. The wind resistance design method for super high-rise buildings based on adjustment of core barrel holing as claimed in claim 1, wherein the different wind speed conditions include: the wind speed control system comprises a subcritical wind speed less than a vortex-induced vibration critical wind speed, a transcritical wind speed equal to the vortex-induced vibration critical wind speed and a supercritical wind speed greater than the vortex-induced vibration critical wind speed.
5. The wind-resistant design method for the super high-rise building based on adjustment of the core tube opening hole as claimed in claim 1, wherein the vibration trajectory of the adjusted super high-rise building model is an elliptical trajectory closer to a circle.
6. The utility model provides a super high-rise building wind-resistant design device based on hole is opened to adjustment core section of thick bamboo which characterized in that contains:
the building module is used for building a super high-rise structure model according to the primary building model and the building plane;
the acquisition module is used for obtaining the structural parameters of the super high-rise structure model under the existing load condition;
the adjusting module is used for adjusting the position and the size of the opening of the core barrel of the super high-rise structure model, and on the premise that the total area of the opening of the core barrel is not changed, the original openings of the core barrel which are symmetrical along the axis are changed into the openings which are symmetrical along the diagonal line, and the structural modal shape deflects to obtain the adjusted super high-rise structure model;
and the calculation module is used for obtaining the wind vibration response of the adjusted super high-rise building model under different wind speed conditions by adopting the structural parameters of the adjusted super high-rise structure model and combining the accurate wind load obtained by a wind tunnel test, and the wind vibration response comprises a roof combined acceleration peak value and a vibration track.
7. The wind resistance design device for super high-rise buildings based on adjusting core barrel holing as claimed in claim 6, wherein the super high-rise building model is established by structural calculation software.
8. The wind resistance design device for the super high-rise building based on the adjustment of the core barrel opening hole as claimed in claim 6 or 7, wherein the structural parameters of the adjusted super high-rise building model comprise: actual mass distribution, frequency and mode shape.
9. The wind resistance design device for super high-rise buildings based on adjustment of core barrel opening holes as claimed in claim 6, wherein the different wind speed conditions comprise: the wind speed control system comprises a subcritical wind speed less than a vortex-induced vibration critical wind speed, a transcritical wind speed equal to the vortex-induced vibration critical wind speed and a supercritical wind speed greater than the vortex-induced vibration critical wind speed.
10. The wind resistance design device for the super high-rise building based on the adjustment of the core barrel opening hole as claimed in claim 6, wherein the vibration trajectory of the adjusted super high-rise building model is an elliptical trajectory which is closer to a circle.
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