Pool design method

Abstract

To provide a pool design method capable of shortening a time required for a cycle of changing the design of a pool.SOLUTION: The method has: a pool shape design step S-1; a velocity response spectrum determination step S-2 of calculating a sloshing specific period and determining a numerical value of a velocity response spectrum to be input to a pool at the sloshing specific period from the velocity response spectrum; and a first design change judgment step S-3 (design change judgment step) of determining whether or not a design change is necessary from the numerical value of the velocity response spectrum determined in the velocity response spectrum determination step S-2. In the first design change judgment step S-3, when the numerical value of the velocity response spectrum is less than a predetermined first set value, it is determined that no design change is necessary, when the numerical value of the velocity response spectrum is equal to or greater than the first set value and is less than a second set value that is greater than the first set value, it is determined that a numerical fluid analysis of the pool should be performed, and when the numerical value of the velocity response spectrum is equal to or greater than the second set value, it is determined that a design change is necessary and the step returns to the pool shape design step S-1.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for designing a swimming pool. [Background technology]

[0002] It is known that long-period vibrations tend to predominate on the upper floors of skyscrapers during earthquakes. Meanwhile, in recent years, swimming pools have been increasingly installed on the upper floors of such skyscrapers, raising concerns about sloshing of pool water caused by the vibrations (hereinafter referred to as sloshing). In response to such concerns, wave dissipating devices that absorb wave energy have been proposed (see, for example, Patent Document 1).

[0003] When designing a pool, methods for predicting and evaluating sloshing in advance include evaluation of the pool's sloshing natural period calculated using a simple calculation formula and simulation using computational fluid analysis. In the evaluation of the pool's sloshing natural period, the pool's sloshing natural period T is calculated based on the pool's width dimension l and water depth h. s The following equation (1) is used to evaluate

[0004]

number

[0005] Where: T s : Natural period of pool sloshing l: Pool width h: Pool depth g:Gravity acceleration

[0006] Simulations using computational fluid analysis often use numerical analysis methods, such as the VOF method and particle method, that can reproduce the behavior of the water surface. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 1-312112 Summary of the Invention [Problem to be solved by the invention]

[0008] In the evaluation of the natural period of pool sloshing, it is possible to determine whether the dominant period of the external force of earthquake shaking is close to the natural period of pool sloshing, but it is not possible to quantitatively evaluate the wave height, flow velocity, and amount of overflowing water caused by sloshing. On the other hand, simulations using computational fluid analysis make it possible to quantitatively and in detail evaluate the wave height, flow velocity, and amount of overflowing water, so specific pool design changes can be made based on the results of these calculations. However, simulations using computational fluid analysis generally require a long time from setting input conditions, such as reproducing the pool shape, to executing the calculations, resulting in a long cycle of design changes to the pool.

[0009] Therefore, an object of the present invention is to provide a method for designing a pool that can shorten the time required for a cycle of changing the design of the pool. [Means for solving the problem]

[0010] In order to achieve the above object, a pool design method according to the present invention includes a pool shape design step of designing a pool shape, a velocity response spectrum determination step of calculating a sloshing natural period from the shape of the pool designed in the pool shape design step and determining a value of the velocity response spectrum to be input to the pool at the sloshing natural period from the velocity response spectrum of the installation floor of the building in which the pool is installed, and a design change judgment step of determining whether or not a design change is necessary from the value of the velocity response spectrum determined in the velocity response spectrum determination step, wherein in the design change judgment step, if the value of the velocity response spectrum is less than a predetermined first set value, it is determined that a design change is unnecessary, if the value of the velocity response spectrum is equal to or greater than the first set value and less than a second set value that is greater than the first set value, it is determined that a numerical fluid analysis of the pool is to be performed, and if the value of the velocity response spectrum is equal to or greater than the second set value, it is determined that a design change is necessary and the process is to return to the pool shape design step.

[0011] In the present invention, the cases in which the computational fluid analysis is performed are limited to cases in which the value of the velocity response spectrum input to the pool in the sloshing natural period determined from the velocity response spectrum of the floor in the building in which the pool is installed is equal to or greater than the first set value and less than the second set value. In other words, the computational fluid analysis is not performed in cases other than the above. Therefore, compared to the case in which the computational fluid analysis was performed in all cases regardless of the value of the velocity response spectrum input to the pool in the sloshing natural period, the number of times the computational fluid analysis is performed is reduced, and the time required for the cycle of design changes can be shortened.

[0012] In the method for designing a pool according to the present invention, the first set value may be 100 kine, and the second set value may be 200 kine.

[0013] In this way, the presence or absence of a design change can be more accurately determined in the design change determination process.

[0014] In order to achieve the above object, a pool design method according to the present invention includes a pool shape design step of designing a pool shape, a velocity response spectrum determination step of calculating a sloshing natural period from the pool shape designed in the pool shape design step and determining a numerical value of the velocity response spectrum to be input to the pool at the sloshing natural period from the velocity response spectrum of the installation floor of the building on which the pool is installed, and a design change judgment step of determining whether or not a design change is necessary from the numerical value of the velocity response spectrum determined in the velocity response spectrum determination step, in which if the numerical value of the velocity response spectrum is less than a predetermined value, it is determined that a design change is unnecessary, and if the numerical value of the velocity response spectrum is equal to or greater than the predetermined value, it is determined that a design change is necessary and the process returns to the pool shape design step.

[0015] In the present invention, since it is possible to determine whether or not a design change is necessary without performing computational fluid analysis, the time required for the design change cycle can be shortened.

[0016] In the method for designing a pool according to the present invention, the predetermined value may be 100 cuins.

[0017] In this way, the presence or absence of a design change can be more accurately determined in the design change determination process. Effect of the Invention

[0018] According to the present invention, the cycle time for changing the design of a pool can be significantly reduced. [Brief description of the drawings]

[0019] [Figure 1] 3 is a flowchart of a pool design method according to the first embodiment. [Diagram 2] 1 is a graph showing the velocity response spectrum of the floor on which the pool is installed in a building. [Diagram 3] 13 is a graph showing the relationship between the numerical input earthquake motion obtained by computational fluid analysis and the maximum water level at the poolside. [Figure 4]13 is a graph showing the relationship between the numerical input earthquake motion obtained by computational fluid analysis and the maximum wave pressure at the poolside. [Diagram 5] 10 is a flowchart of a pool design method according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] (First embodiment) Hereinafter, a pool design method according to a first embodiment of the present invention will be described with reference to Figs. 1 to 4. The method for designing a pool according to the first embodiment is, for example, a method for designing a leisure pool to be installed on the upper floors of a high-rise building or a skyscraper. Fig. 1 shows a flowchart of the method for designing a pool according to the first embodiment. The pool shape design process S-1 is carried out to design the shape of the pool. In the pool shape design process S-1, the planar shape and water depth of the pool are designed. In the pool shape design process S-1, in addition to the pool shape, the poolside, water supply and drainage, electricity, air conditioning and other facilities, as well as the interior are also designed.

[0021] A velocity response spectrum determination process S-2 is carried out to determine the velocity response spectrum value to be input to the pool. In the velocity response spectrum determination process S-2, the sloshing natural period T s Calculate the following. Pool sloshing natural period T s teeth 、 It is calculated using the following formula (1).

[0022]

number

[0023] Where: T s : Natural period of pool sloshing l: Pool width h: Pool depth g:Gravity acceleration

[0024] If the plan shape of the pool is rectangular, the natural period of sloshing of the pool in both the longitudinal and transverse directions, T s Calculate the following. The sloshing natural period T is calculated from the velocity response spectrum of the floor where the pool is installed. s The velocity response spectrum value input to the pool in is determined. Figure 2 shows the velocity response spectrum of the floor on which the pool is installed in the building. The velocity response spectrum is the maximum response value expressed as a spectrum by inputting the vibration waveform on a specific floor when the target earthquake wave acts on the building into a single-mass system vibration model with different natural periods.

[0025] A first design change judgment process S-3 is performed to judge whether or not a design change is required based on the velocity response spectrum values ​​judged in the velocity response spectrum judgment process S-2. If the velocity response spectrum value is less than 100 kines, it is determined that no design changes are necessary and the design is terminated. If the velocity response spectrum value is 200 kines or more, the process returns to the pool shape design process S-1 and the shape of the pool is changed. If the velocity response spectrum value is 100 kines or more but less than 200 kines, the computational fluid analysis process S-4 is performed. The velocity response spectrum value of 100 kines corresponds to the first set value in the claims, and the velocity response spectrum value of 200 kines corresponds to the second set value in the claims.

[0026] In the computational fluid analysis process S-4, the wave height, flow velocity, and overflowing water volume caused by sloshing are quantitatively evaluated through simulations using numerical analysis methods that can reproduce the behavior of the water surface, such as the VOF method and particle method. Based on the evaluation of the wave height, flow velocity, and overflowing water volume when sloshing occurs in the computational fluid analysis process S-4, a second design change decision process S-5 is carried out to determine whether or not a design change is necessary. If the wave height, flow velocity, overflowing water volume, etc. when sloshing occurs are below predetermined values ​​and it is determined that there will be no effects of sloshing and it is safe, the design is completed. If in the computational fluid analysis process S-4 the wave height, flow velocity, overflowing water volume, etc. when sloshing occurs are above predetermined values ​​and it is determined that there will be effects of sloshing and it is unsafe, the process returns to the pool shape design process S-1 and the shape of the pool is changed.

[0027] Pool sloshing natural period T s However, if the natural period of the building's pool floor is synchronized or approximated, the velocity response spectrum value will be large, exceeding 200 kinks. Therefore, if you go back to the pool shape design process S-1 and change the pool shape, the pool's sloshing natural period T s However, the shape of the pool is changed so that it is not in tune with or close to the natural period of the floor on which the pool is installed. For example, as shown by arrow A in Figure 2, the natural period of the pool sloshing T s Change the shape of the pool so that it is smaller.

[0028] The validity of the above-mentioned first design change judgment process S-3 will be explained with reference to FIGS. 3 and 4. FIG. For several computational fluid analysis cases that have been conducted on actual swimming pools, the maximum water level at the poolside is shown in Figure 3, and the maximum wave pressure is shown in Figure 4, for the value of the velocity response spectrum of the vibration of the installation floor at the pool's sloshing natural period. As can be seen from Figures 3 and 4, the water level and wave pressure values, which are specific indicators of the safety of the pool, rise sharply between the input earthquake motion values ​​of 100 and 200 kines. In particular, when the input earthquake motion values ​​are less than 100 kines, the water level and wave pressure have not been large enough to require special design changes, and when the input earthquake motion values ​​are 200 kines or more, design changes are required in all cases. When the input earthquake motion values ​​are between 100 and 200 kines, there are cases where design changes are necessary or not. For these reasons, the decision on whether or not to make a design change in the first design change decision process S-3 is appropriate.

[0029] Next, the action and effect of the pool design method according to this embodiment will be described. In the pool design method according to the present embodiment, the computational fluid analysis is performed based on the sloshing natural period T s The velocity response spectrum value entered into the pool in is limited to cases that are equal to or greater than the first set value and less than the second set value. In other words, computational fluid analysis is not performed in cases other than those mentioned above. As a result, the number of computational fluid analyses is reduced compared to when computational fluid analysis was performed for all cases regardless of the velocity response spectrum value determined from the sloshing natural period and the velocity response spectrum, and the time required for the design change cycle can be shortened. Normally, when computational fluid analysis is performed and design changes are made, it takes several days to several weeks, whereas when the response spectrum value is determined and the design is changed, it only takes a few days. This will also enable a simple, objective, and quantitative evaluation of the impact of pool sloshing, and is expected to have the effect of increasing the degree of freedom in design, planning, and operation of the pool while ensuring its safety.

[0030] Second embodiment Next, a second embodiment will be described. The same or similar members and parts as those in the first embodiment described above are designated by the same reference numerals, and the description will be omitted. Only the configurations different from the first embodiment will be described. FIG. 5 shows a flowchart of a pool design method according to the second embodiment. The pool shape design step S-21 for designing the shape of the pool is performed in the same manner as the pool shape design step S-1 in the first embodiment.

[0031] In the velocity response spectrum determination step S-22, the sloshing natural period T s The sloshing natural period T is calculated from the velocity response spectrum of the floor where the pool is installed. s Determine the numerical value of the velocity response spectrum to be entered into the pool at

[0032] In the design change judgment process S-23, if the velocity response spectrum is less than 100 kine, it is judged that no design change is necessary and the design is terminated. If the velocity response spectrum is 100 kine or more, the process returns to the pool shape design process S-1 and the shape of the pool is changed. The velocity response spectrum of 100 kine corresponds to the specified value in the claims.

[0033] In the pool design method according to the second embodiment described above, it is possible to determine whether or not design changes are necessary without performing computational fluid analysis, so that the time required for a design change cycle can be further shortened compared to the pool design method according to the first embodiment.

[0034] Although an embodiment of the pool design method according to the present invention has been described above, the present invention is not limited to the above embodiment and can be modified as appropriate without departing from the spirit of the present invention. For example, in the first embodiment, the judgment is changed in the first design change judgment process S-3 when the velocity response spectrum is less than 100 kine, when it is 100 kine or more and less than 200 kine, or when it is 200 kine or more. In the second embodiment, the judgment is changed in the design change judgment process S-23 when the velocity response spectrum is less than 100 kine, or when it is 100 kine or more. The thresholds for changing the judgment in the first design change judgment process S-3 and the design change judgment process S-23 may be set appropriately. [Explanation of symbols]

[0035] S-1, S-21 Pool shape design process S-2, S-22 Velocity response spectrum determination process S-3 First design change decision process (design change decision process) S-23 Design change decision process S-4 Numerical fluid analysis process S-5 Second design change decision process

Claims

1. A pool shape design process for designing the shape of the pool; a velocity response spectrum determination step of calculating a sloshing natural period from the shape of the pool designed in the pool shape design step, and determining a value of the velocity response spectrum to be input to the pool in the sloshing natural period from the velocity response spectrum of an installation floor of a building in which the pool is installed; and a design change determination step of determining whether or not a design change is required based on the value of the speed response spectrum determined in the speed response spectrum determination step, In the design change determination step, If the value of the velocity response spectrum is less than a predetermined first set value, it is determined that no design change is necessary; When the value of the velocity response spectrum is equal to or greater than the first set value and is less than a second set value that is greater than the first set value, it is determined to perform a numerical fluid analysis of the pool; When the velocity response spectrum value is equal to or greater than a second set value, it is determined that a design change is necessary and the process returns to the pool shape design process.

2. 2. The method of claim 1, wherein the first set value is 100 kine and the second set value is 200 kine.

3. A pool shape design process for designing the shape of the pool; a velocity response spectrum determination step of calculating a sloshing natural period from the shape of the pool designed in the pool shape design step, and determining a value of the velocity response spectrum to be input to the pool in the sloshing natural period from the velocity response spectrum of an installation floor of a building in which the pool is installed; and a design change determination step of determining whether or not a design change is required based on the value of the speed response spectrum determined in the speed response spectrum determination step, In the design change determination step, If the value of the velocity response spectrum is less than a predetermined value, it is determined that no design change is necessary; When the velocity response spectrum value is equal to or greater than the predetermined value, it is determined that a design change is necessary and the process is returned to the pool shape design process.

4. 4. The method for designing a pool according to claim 3, wherein the predetermined value is 100 kains.

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