CN114004045A - Y-shaped pipe node stress concentration coefficient calculation method and device and storage medium - Google Patents
Y-shaped pipe node stress concentration coefficient calculation method and device and storage medium Download PDFInfo
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- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention discloses a method and a device for calculating stress concentration coefficients of Y-shaped tube nodes and a storable medium, wherein the method comprises the following steps: considering the situation that the Y-shaped pipe only bears the torque load by the first plane; under the condition that the Y-shaped pipes have different geometric parameters, a stress concentration coefficient calculation model of a plurality of nodes of the Y-shaped pipes on the first plane is established; applying the condition simulation of the torque load to a plurality of calculation models, counting calculation results of each model and carrying out parameter sensitivity analysis on the calculation results; determining one side of the upper chord and the stress coefficient peak value of the chord according to the parameter sensitivity analysis result, performing nonlinear fitting analysis according to the stress coefficient peak value to obtain a stress peak value calculation model on the first plane, and obtaining a final stress coefficient peak value according to the model; the invention perfects a space tube node stress concentration coefficient calculation system.
Description
Technical Field
The invention relates to the technical field of node design, in particular to a method and a device for calculating stress concentration coefficients of a Y-shaped pipe node and a storage medium.
Background
At present, a three-plane Y-shaped pipe node is a typical space pipe node, and is mostly found in a three-pile foundation structure of an offshore wind turbine in a tidal zone area in the southeast of China. The offshore wind turbine foundation structure needs to resist complex cyclic loads such as wind load, wave load, ocean current load, water level change, growth of marine organisms, scouring and erosion and the like in a service period. Therefore, fatigue safety evaluation is an important link in designing the foundation structure of the offshore wind turbine.
However, the most commonly used method for fatigue design of pipe joints is the S-N curve method based on hot spot stress. The method comprises the steps of firstly calculating nominal stress on each supporting rod of a pipe node according to external loads borne by each rod piece of the pipe node, secondly calculating stress concentration coefficient values under different loads according to a formula, thirdly multiplying the nominal stress by the peak value of the stress concentration coefficient to obtain hot spot stress, and lastly obtaining the fatigue life of the pipe node according to the hot spot stress values and an S-N curve of a material. In conclusion, how to accurately predict the stress concentration coefficient of the pipe node is an important basis for structural fatigue safety evaluation. At home and abroad, a plurality of recommended formulas for stress concentration coefficients of different types of pipe nodes exist, but a related calculation method for a stress concentration coefficient peak value of a three-plane Y-shaped pipe node under the action of torque load is lacked, and the stress concentration degree of the node cannot be comprehensively grasped.
Therefore, how to provide a method for calculating the stress concentration coefficient of a node of a Y-tube that can solve the above problems is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a method and a device for calculating stress concentration coefficients of a node of a Y-shaped pipe, and a storage medium, which improve a stress concentration coefficient calculation system of a node of a spatial pipe, and provide a design basis and a basis for fatigue evaluation after calculating the stress concentration coefficient under the action of a torque load.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for calculating stress concentration coefficients of nodes of a Y-shaped pipe, wherein the Y-shaped pipe comprises an upper chord, a chord and a support rod which are connected to one point, and the nodes of the Y-shaped pipe work on a first plane, a second plane and a third plane, comprises the following steps:
considering the situation that the Y-shaped pipe only bears the torque load by the first plane;
under the condition that the Y-shaped pipes have different geometric parameters, a stress concentration coefficient calculation model of a plurality of nodes of the Y-shaped pipes on the first plane is established;
applying the condition simulation of the torque load to a plurality of calculation models, counting calculation results of each model and carrying out parameter sensitivity analysis on the calculation results;
and determining one side of the upper chord and the stress coefficient peak value of the chord according to the parameter sensitivity analysis result, carrying out nonlinear fitting analysis according to the stress coefficient peak value to obtain a stress peak value calculation model on the first plane, and obtaining a final stress coefficient peak value according to the model.
Preferably, a specific expression of the stress concentration coefficient calculation model of the Y-shaped pipe node on the first plane is as follows:
in the formula, alpha is the length-slenderness ratio of the upper chord, beta is the diameter ratio of the upper chord to the upper chord, gamma is the diameter-thickness ratio of the upper chord, tau is the wall-thickness ratio of the upper chord, and theta is the included angle of the upper chord to the upper chord.
Preferably, the specific expression of the stress peak calculation model of the first plane is as follows:
in the formula, SCF is a stress peak value, alpha is the length-thin ratio of the upper chord, beta is the diameter ratio of the chord to the upper chord, gamma is the diameter-thickness ratio of the upper chord, tau is the wall-thickness ratio of the upper chord, and theta is the included angle of the chord to the upper chord.
Preferably, the parameter ranges for α are [6,15], β are [0.4,0.75], γ are [25,40], τ are [0.5,0.9], and θ are [30 °, 60 ° ].
Further, the present invention provides a device for calculating a stress concentration coefficient of a node of a Y-shaped tube, wherein the Y-shaped tube includes an upper chord, a chord and a brace connected to a point, and the node of the Y-shaped tube works on a first plane, a second plane and a third plane, including:
the data acquisition module is used for acquiring the geometric parameters of the Y-shaped pipe;
the first calculation module is used for considering the condition that the Y-shaped pipe only bears torque load by the first plane, and establishing a stress concentration coefficient calculation model of a plurality of nodes of the Y-shaped pipe on the first plane according to the geometric parameters of the Y-shaped pipe;
the analysis module is used for applying the condition simulation of the torque load to a plurality of calculation models, counting calculation results of the models and carrying out parameter sensitivity analysis on the calculation results;
the second calculation module is used for determining the stress coefficient peak value of one side of the upper chord and the chord according to the parameter sensitivity analysis result, performing nonlinear fitting analysis according to the stress coefficient peak value to obtain a stress peak value calculation model on the first plane, and acquiring a final stress coefficient peak value according to the model;
and the output module is used for outputting the final stress coefficient peak value.
Further, the present invention also provides a computer-readable storage medium on which a computer program is stored, the computer program, when executed by a processor, implementing the coefficient calculation method of any one of the above.
Compared with the prior art, the technical scheme has the advantages that the method and the device for calculating the stress concentration coefficient of the Y-shaped pipe node and the storage medium are provided, the space pipe node stress concentration coefficient calculation system is perfected, and after the stress concentration coefficient under the action of the torque load is calculated, a design basis and a foundation are provided for fatigue evaluation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a detailed flowchart of a method for calculating stress concentration coefficients of a Y-shaped tube node according to the present invention;
FIG. 2 is a schematic structural diagram of a Y-tube node stress concentration coefficient calculation apparatus according to the present invention;
FIG. 3 is a schematic structural diagram of a three-plane Y-tube node according to an embodiment of the present invention;
FIG. 4 is a schematic view of a torque load condition of a three-plane Y-shaped tube node according to an embodiment of the present invention;
FIG. 5 is an alpha sensitivity analysis (chord) provided by an embodiment of the present invention;
FIG. 6 is an alpha sensitivity analysis (strut) provided by an embodiment of the present invention;
FIG. 7 is a beta sensitivity analysis (chord) provided by an embodiment of the present invention;
FIG. 8 is a beta sensitivity analysis (strut) provided by an embodiment of the present invention;
FIG. 9 is a gamma sensitivity analysis (chord) provided by an embodiment of the present invention;
FIG. 10 is a gamma sensitivity analysis (strut) provided by an embodiment of the present invention;
FIG. 11 is a τ sensitivity analysis (chord) provided by an embodiment of the present invention;
FIG. 12 is a τ sensitivity assay (strut) provided by an embodiment of the present invention;
FIG. 13 is a θ sensitivity analysis (chord) provided by an embodiment of the present invention;
FIG. 14 is a theta sensitivity analysis (strut) provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 3-4, the embodiment of the invention discloses a method for calculating stress concentration coefficients of nodes of a Y-shaped pipe, which is shown in fig. 3-4 and is applied to a structural schematic diagram of nodes of a three-plane Y-shaped pipe, wherein the Y-shaped pipe comprises an upper chord, a chord and a brace rod which are connected to one point, and the length of the upper chord is L1The length of the chord is LCThe length of the stay bar is lBAnd the node of the Y-shaped tube works in a first plane T1, a second plane T2 and a third plane T3, comprising:
considering the situation that the Y-shaped pipe only bears the torque load by the first plane, wherein the direction of the torque load is coincident with the axial direction of the strut of the first plane T1, the maximum value of von Mises equivalent stress caused by the torque load at each position of the three-plane Y-shaped pipe node is smaller than the yield strength of the steel material of the pipe node, 1920 numerical models of the three-plane Y-shaped pipe node with different geometric parameters are established, wherein a typical expression is shown as formula (1):
in the formula, alpha is the length-slenderness ratio of the upper chord, beta is the diameter ratio of the upper chord to the upper chord, gamma is the diameter-thickness ratio of the upper chord, tau is the wall-thickness ratio of the upper chord, and theta is the included angle of the upper chord to the upper chord.
Specifically, the parameter range of α is [6,15], the parameter range of β is [0.4,0.75], the parameter range of γ is [25,40], the parameter range of τ is [0.5,0.9], and the parameter range of θ is [30 °, 60 ° ].
Specifically, the values of the geometric parameters of each numerical model are shown in table 1.
Table 1 numerical model geometric parameter values
Applying the torque load condition to the node numerical model established in the second step, calculating respectively, carrying out a total of 1920 calculations to obtain 1920 sets of calculation results, counting the calculation results of each model, and carrying out parameter sensitivity analysis, wherein the sensitivity analysis of alpha is shown in fig. 5 and 6, the sensitivity analysis of beta is shown in fig. 7 and 8, the sensitivity analysis of gamma is shown in fig. 9 and 10, the sensitivity analysis of tau is shown in fig. 11 and 12, and the sensitivity analysis of theta is shown in fig. 13 and 14. The qualitative judgment in the form of a formula can be obtained according to the result of the sensitivity analysis subsequently. Only if the formula form is determined, the derivation of the final detailed formula can be performed.
According to the parameter sensitivity analysis results, carrying out multidimensional nonlinear fitting analysis respectively aiming at SCF peak values on the upper chord side and the support rod side to obtain a stress concentration coefficient peak value calculation formula of the upper chord and the support rod on the three-plane Y-shaped tube node T1 plane, wherein the specific expression is shown as formula (2):
in the formula, SCF is a stress peak value, alpha is the length-thin ratio of the upper chord, beta is the diameter ratio of the chord to the upper chord, gamma is the diameter-thickness ratio of the upper chord, tau is the wall-thickness ratio of the upper chord, and theta is the included angle of the chord to the upper chord.
Wherein, the specific calculation formula of the parameters is as follows:
LCcalculating the length, L, for the upper chord1Length of upper chord, D outer diameter of upper chord, T wall thickness of upper chord, lBThe length is calculated for the strut, d is the strut outside diameter, and t is the strut wall thickness.
Referring to fig. 2, an embodiment of the present invention further provides a device for calculating a stress concentration coefficient of a node of a Y-shaped pipe, where the Y-shaped pipe includes an upper chord, a chord, and a brace connected to a point, and the node of the Y-shaped pipe works on a first plane, a second plane, and a third plane, and includes:
the data acquisition module is used for acquiring the geometric parameters of the Y-shaped pipe;
the first calculation module is used for considering the condition that the Y-shaped pipe only bears torque load by the first plane, and establishing a stress concentration coefficient calculation model of a plurality of nodes of the Y-shaped pipe on the first plane according to the geometric parameters of the Y-shaped pipe;
the analysis module is used for applying the condition simulation of the torque load to a plurality of calculation models, counting calculation results of the models and carrying out parameter sensitivity analysis on the calculation results;
the second calculation module is used for determining the stress coefficient peak value of one side of the upper chord and the chord according to the parameter sensitivity analysis result, performing nonlinear fitting analysis according to the stress coefficient peak value to obtain a stress peak value calculation model on the first plane, and acquiring a final stress coefficient peak value according to the model;
and the output module is used for outputting the final stress coefficient peak value.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the coefficient calculation method described in any of the above embodiments.
The following describes in detail a specific embodiment of the present invention, taking a certain practical process as an example.
Geometric parameters of a three-plane Y-shaped pipe node in a three-pile foundation structure of a certain offshore wind turbine are shown in table 3, and the bearing torque of the pipe node T1 plane stay bar is 4522kN m. The hot spot stress calculation process of the pipe joint under the working condition is as follows.
TABLE 3 three-plane Y-tube nodal geometry parameters
The first step is as follows: and calculating the nominal stress of the T1 plane according to a material mechanics formula.
The second step is that: substituting the geometric parameters in the table 3 into a formula, and calculating to obtain that the peak value of the stress concentration coefficient at one side of the chord member of the pipe joint is 14.32.
The third step: substituting the geometric parameters in the table 3 into the formula (6), and calculating to obtain that the peak value of the stress concentration coefficient at one side of the pipe node stay bar is 9.07.
The fourth step: and comparing the stress middle coefficient peak values of the chord member and the brace rod, and taking a larger value (namely 14.32) as the stress concentration coefficient peak value of the three-plane Y-shaped pipe node.
The fifth step: and multiplying the nominal stress by the peak value of the stress concentration coefficient to obtain a hot spot stress value of 146.17MPa of the three-plane Y-shaped tube node under the working condition, and then using the hot spot stress value as a basis for the fatigue design of the steel tube node.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A method for calculating stress concentration coefficients of nodes of a Y-shaped pipe, wherein the Y-shaped pipe comprises an upper chord, a chord and a support rod which are connected to one point, and the nodes of the Y-shaped pipe work on a first plane, a second plane and a third plane, is characterized by comprising the following steps:
considering the situation that the Y-shaped pipe only bears the torque load by the first plane;
under the condition that the Y-shaped pipes have different geometric parameters, a stress concentration coefficient calculation model of a plurality of nodes of the Y-shaped pipes on the first plane is established;
applying the condition simulation of the torque load to a plurality of calculation models, counting calculation results of each model and carrying out parameter sensitivity analysis on the calculation results;
and determining one side of the upper chord and the stress coefficient peak value of the chord according to the parameter sensitivity analysis result, carrying out nonlinear fitting analysis according to the stress coefficient peak value to obtain a stress peak value calculation model on the first plane, and obtaining a final stress coefficient peak value according to the model.
2. The method for calculating the stress concentration coefficient of the Y-shaped pipe node according to claim 1, wherein a specific expression of a stress concentration coefficient calculation model of the Y-shaped pipe node on the first plane is as follows:
in the formula, alpha is the length-slenderness ratio of the upper chord, beta is the diameter ratio of the upper chord to the upper chord, gamma is the diameter-thickness ratio of the upper chord, tau is the wall-thickness ratio of the upper chord, and theta is the included angle of the upper chord to the upper chord.
3. The method for calculating the stress concentration coefficient of the Y-shaped pipe node according to claim 1, wherein the specific expression of the stress peak calculation model of the first plane is as follows:
in the formula, SCF is a stress peak value, alpha is the length-thin ratio of the upper chord, beta is the diameter ratio of the chord to the upper chord, gamma is the diameter-thickness ratio of the upper chord, tau is the wall-thickness ratio of the upper chord, and theta is the included angle of the chord to the upper chord.
4. A method for calculating stress concentration coefficients of nodes of Y-type tubes according to any one of claims 2 to 3, wherein the parameter range of α is [6,15], the parameter range of β is [0.4,0.75], the parameter range of γ is [25,40], the parameter range of τ is [0.5,0.9], and the parameter range of θ is [30 °, 60 ° ].
5. A Y type pipe node stress concentration coefficient calculation device, Y type pipe is including last chord member, chord member and the vaulting pole of connecting in a point, and the node work of Y type pipe is in first plane, second plane and third plane, its characterized in that includes:
the data acquisition module is used for acquiring the geometric parameters of the Y-shaped pipe;
the first calculation module is used for considering the condition that the Y-shaped pipe only bears torque load by the first plane, and establishing a stress concentration coefficient calculation model of a plurality of nodes of the Y-shaped pipe on the first plane according to the geometric parameters of the Y-shaped pipe;
the analysis module is used for applying the condition simulation of the torque load to a plurality of calculation models, counting calculation results of the models and carrying out parameter sensitivity analysis on the calculation results;
the second calculation module is used for determining the stress coefficient peak value of one side of the upper chord and the chord according to the parameter sensitivity analysis result, performing nonlinear fitting analysis according to the stress coefficient peak value to obtain a stress peak value calculation model on the first plane, and acquiring a final stress coefficient peak value according to the model; and the output module is used for outputting the final stress coefficient peak value.
6. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the coefficient calculation method according to any one of claims 1 to 4.
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