CN114239127A - Analysis and calculation method for ship lock floating type mooring post in working state - Google Patents

Analysis and calculation method for ship lock floating type mooring post in working state Download PDF

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CN114239127A
CN114239127A CN202111154972.2A CN202111154972A CN114239127A CN 114239127 A CN114239127 A CN 114239127A CN 202111154972 A CN202111154972 A CN 202111154972A CN 114239127 A CN114239127 A CN 114239127A
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ship lock
floating
mooring
column
strain
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CN114239127B (en
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齐俊麟
刘明维
刘振嘉
江涛
覃涛
吴林键
李明龙
乔小东
杨珏
覃露
孟兵
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Three Gorges Navigation Authority
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Abstract

A method for analyzing and calculating a ship lock floating type mooring post in a working state is characterized in that according to the stress characteristics of a ship lock floating type mooring post structure, a post body of a hollow cylinder mooring post of the ship lock floating type mooring post is generalized into an elastic beam with an equal section, and a steel plate for fixing the hollow cylinder is generalized into a fixed hinged support; based on a stretch-bending combined deformation analysis method in material mechanics, selecting any stress point on a floating mooring column body of a ship lock, and analyzing axial tensile strain and bending strain of the stress point on the surface of the column body; establishing a floating mooring post load mechanical response model in a working state; and (3) adopting floating type bollard simulation tests under different working conditions to calibrate the axial tension coefficient, the horizontal bending coefficient and the vertical bending coefficient of the model. The method can calculate the magnitude and direction of the mooring force borne by the floating mooring column by measuring the strain of the appointed measuring point on the same section of the column body of the floating mooring column of the ship lock, and lays a theoretical foundation for realizing the automatic sensing and early warning technology of the floating mooring column of the ship lock in a working state.

Description

Analysis and calculation method for ship lock floating type mooring post in working state
Technical Field
The invention relates to the technical field of ship lock monitoring, in particular to an analysis and calculation method for a ship lock floating type mooring post in a working state.
Background
In ship lock engineering, the floating mooring columns are mooring facilities of the ship passing through the lock in a lock chamber, and the navigation facilities float up and down along with the water level change under the action of buoyancy, so that the requirement of safe mooring of the navigation ship is met. However, in the actual use process, the mooring force applied to the floating mooring column easily exceeds the design allowable value under the influence of factors such as large size of a navigation ship, nonstandard mooring line, too high speed of entering a lock, blockage of the floating mooring column by floaters, functions of filling and draining water in a lock and the like, so that the structure of the floating mooring column is damaged, and further serious safety accidents such as lifting of the ship, pulling of the ship into water, damage of a ship body and even injury and death of a crew are caused. Therefore, how to realize the rapid evaluation on the safety of the floating bollard mooring line of the ship lock has important practical significance.
Currently, lock floating bollard structures are primarily used for mooring safety assessment via a cable load monitoring system mounted on the mooring lines of the navigable vessel. However, the actual force applied to the floating mooring column structure of the ship lock is not only related to the magnitude of the mooring force of the ship, but also affected by the mooring angle, mooring direction, mooring position and other factors. The influence of the ship mooring force on the stress characteristic of the ship lock floating mooring column structure can not be effectively reflected only by monitoring the mooring force on the mooring rope, the safety state of the mooring rope for ship lock navigation is difficult to accurately evaluate, and the method has great limitation. Meanwhile, the ship lock floating type mooring column mooring line safety assessment method is not active for a navigation hub management unit, and all navigation ships cannot be tracked and monitored in a real-time and full-coverage mode to perform safety early warning.
The strain of the ship lock floating mooring column structure can directly reflect the stress state of the ship lock floating mooring column structure. In recent years, researchers have proposed that mooring line safety assessment of mooring line structures can be achieved by monitoring mooring line surface strain. In practice, the effect of different mooring heights and different mooring line angles on the lock floating mooring column is different under the same mooring line force, and the method needs to be discussed further only by simply measuring the strain on the structure of the lock floating mooring column and taking the strain as the basis for evaluating the safety of the mooring line of the floating mooring column.
In order to quickly and accurately obtain the mooring force of the floating mooring column in the working state, a reasonable structural mechanics analysis model is required to be established. Therefore, how to establish a reasonable floating mooring column work response mechanical model becomes one of the problems to be solved urgently at present.
Disclosure of Invention
In order to solve the technical problems, the invention provides an analysis and calculation method for a floating mooring post of a ship lock in a working state, which can calculate the magnitude and the direction of mooring force borne by the floating mooring post by measuring the strain of a specified measuring point on the same section of the floating mooring post body of the ship lock, and lays a theoretical foundation for the realization of the automatic perception and early warning technology of the floating mooring post of the ship lock in the working state.
The technical scheme adopted by the invention is as follows:
a method for analyzing and calculating a ship lock floating type mooring post in a working state is characterized in that the upper structure of the ship lock floating type mooring post is generalized into a simply supported overhanging beam according to the stress characteristics of the ship lock floating type mooring post structure; based on a stretch-bending combined deformation analysis method in material mechanics, selecting any stress point on a floating mooring column body of a ship lock, and analyzing the strain characteristic relation of the stress point on the surface of the column body; establishing a floating mooring post load mechanical response model in a working state; and (3) adopting floating mooring column simulation tests under different working conditions to calibrate the axial tension coefficient, the horizontal bending coefficient and the vertical bending coefficient of the model, and realizing analysis and calculation of the mooring force of the floating mooring column of the ship lock under the working state.
A method for analyzing and calculating a ship lock floating mooring column in a working state comprises the following steps:
step 1: according to the stress characteristics of the structure of the ship lock floating mooring column, the column body of the hollow cylinder mooring column of the ship lock floating mooring column is generalized into an elastic beam with a uniform section, and a steel plate for fixing the hollow cylinder is generalized into a fixed hinged support;
step 2: based on a stretch-bending combined deformation analysis method in material mechanics, selecting any stress point on a floating mooring column body of a ship lock, and analyzing axial tensile strain and bending strain of the stress point on the surface of the column body;
and step 3: establishing a floating mooring post load mechanical response model in a working state;
and 4, step 4: and (3) adopting floating type bollard simulation tests under different working conditions to calibrate the axial tension coefficient, the horizontal bending coefficient and the vertical bending coefficient of the model.
In the step 2, the calculation formula of the axial tensile strain is as follows:
Figure BDA0003288213820000021
in the formula: epsilon1Is the tensile strain of the surface of the floating mooring post of the ship lock; fzIs the vertical component of the mooring force; a is the cross-sectional area of the ship lock floating mooring column; e is the elastic modulus of the ship lock floating mooring column; and a is the axial stretch coefficient.
The bending strain calculation formula is:
Figure BDA0003288213820000022
in the formula: epsilon2Bending strain of the surface of the floating mooring column of the ship lock; fxyThe horizontal component of the mooring force is I, and the I is the inertia moment of a circular ring of the cross section of the floating mooring column of the ship lock; d is the vertical distance from the strain measurement point to the neutral axis; r is the radius of the circular ring of the axial section of the floating mooring column of the ship lock; l is1The length of a simply-supported section of the floating mooring column of the ship lock; l is2The length of a cantilever section of a floating mooring column of the ship lock; h is the distance from the strain measurement point to a simple support point on the floating mooring column of the ship lock; b is the horizontal bending coefficient, and c is the vertical bending coefficient.
The strain characteristic relation of any stress point on the surface of the floating mooring column of the ship lock is as follows:
Figure BDA0003288213820000031
the step 3 comprises the following steps:
step 3.1: mooring force F at a given heightfUnder the action, the distance between the mooring line of the ship mooring rope and the cross section of the measuring point is L2+ h, force analysis to obtain horizontal component force F of the mooring linexyAnd a vertical component force FzRespectively as follows:
Fxy＝Ffcosβ；
Fz＝Ffsinβ；
in the formula: beta is the included angle between the cable and the horizontal plane;
step 3.2: on the axial section surface of a measuring point of a floating bollard of a ship lock, three strain measuring points B, C, D are selected, h is 600mm at the moment, and the distances between the strain measuring points B, C, D and a neutral plane are respectively obtained as follows:
dB＝Rsinξ；
dC＝sin(ξ+μ)；
Figure BDA0003288213820000032
in the formula: r is the radius of the circular ring of the axial section of the floating mooring column of the ship lock; xi is an included angle between a straight line connecting the measuring point and the circle center and the neutral axis; mu is an included angle between the two measuring points B and C and a connecting line of the circle centers, and the included angle is 10 degrees;
Figure BDA0003288213820000033
the included angle between the two measuring points C and D and the connecting line of the circle center is 10 degrees;
step 3.3: alpha, xi, and,
Figure BDA0003288213820000034
The relationship between:
α＝90°+ξ-θ；
in the formula: alpha is the included angle between the cable and the gate wall line,
Figure BDA0003288213820000035
taking an angle of 80 degrees for an included angle between the measuring point B and a circle center connecting line and the gate wall line;
step 3.4: the formula in step 2, step 3.1, step 3.2 and step 3.3 is combined, and the strain of the strain monitoring point B, C, D is solved to be epsilonB、εC、εDRespectively as follows:
Figure BDA0003288213820000036
Figure BDA0003288213820000041
Figure BDA0003288213820000042
in the formula (I), the compound is shown in the specification,
Figure BDA0003288213820000043
the step 4 comprises the following steps:
step 4.1: establishing a three-dimensional entity model of the floating mooring column of the ship lock according to the actual sizes of all parts of the floating mooring column of the ship lock;
step 4.2, importing the established three-dimensional entity model into finite element analysis software to generate a geometric model;
step 4.3, establishing a contact relation of adjacent parts, carrying out meshing by adopting a self-adaptive meshing method, and establishing a finite element analysis model;
step 4.4, applying load and boundary constraint conditions to the floating mooring columns according to the stress conditions of the floating mooring columns in the working state;
and 4.5, selecting relevant parameters of the positions of the measuring points based on the calculation result of the numerical simulation test of the ship lock floating mooring column, and performing multiple linear regression analysis on the formula in the step 2 by using the basic principle of a least square method to obtain undetermined parameter values in various formulas.
The invention relates to a method for analyzing and calculating a ship lock floating mooring pillar in a working state, which has the following technical effects:
1) the invention establishes the ship lock floating mooring post work response mechanical model reflecting the characteristic relation between the ship mooring force and the ship lock floating mooring post column body strain, and can calculate the magnitude and the direction of the mooring force borne by the floating mooring post by measuring the strain of the appointed measuring point on the same section of the ship lock floating mooring post column body, thereby laying a theoretical foundation for realizing the automatic sensing and early warning technology of the ship lock floating mooring post in the working state.
2) In the using process of the ship lock floating mooring column, the calculated ship mooring force is compared with the mooring force design allowable value of the ship lock floating mooring column, so that the safety evaluation of the mooring line of the ship lock floating mooring column can be realized, and a feasible technical scheme is provided for the problems that the safety state of ship lock navigation cannot be effectively evaluated and the ship lock navigation cannot be monitored in a full-coverage mode.
Drawings
Fig. 1 is a flow chart of the analysis and calculation method of the ship lock floating mooring column.
Fig. 2 is a schematic structural view of a ship lock floating mooring post provided by the embodiment of the invention;
in fig. 2: 1-mooring shipway, 2-rolling device and 3-buoy.
Fig. 3 is a simplified calculation chart of the floating mooring post structure of the ship lock of the present invention.
FIG. 4(a) is a first schematic view of a simplified lock floating mooring column of the present invention in section I-I;
FIG. 4(b) is a schematic view of section II-II of the simplified lock floating mooring column of the present invention;
fig. 5 is a schematic view of the strain monitoring position and relative angle of the floating mooring column of the ship lock of the present invention.
Fig. 6 is a three-dimensional solid model diagram of the superstructure of the ship lock floating mooring post.
FIG. 7(a) is a strain calculation result graph (strain at point B) of a numerical simulation test;
FIG. 7(b) is a strain calculation result graph (strain at point C) of the numerical simulation test;
fig. 7(c) is a graph of the strain calculation result of the numerical simulation test (point D strain).
Detailed Description
As shown in fig. 2, the main components of the floating mooring post include a buoy 3, a rolling device 2, and a mooring frame 1. The actual stress of the ship lock floating mooring column structure is not only related to the magnitude of the mooring force of the ship, but also affected by multiple factors such as the mooring angle, the mooring direction and the mooring position of the mooring rope, so that the stress of the floating mooring column is uncertain.
As shown in fig. 1, a method for analyzing and calculating a ship lock floating bollard under a working state comprises the following steps:
step 1: as shown in fig. 3, the upper structure of the ship lock floating mooring column is generalized to a simple outrigger beam according to the stress characteristics of the ship lock floating mooring column structure, namely: a column body of a hollow cylinder mooring column of the ship lock floating mooring column is generalized into an elastic beam with a uniform section, and a steel plate for fixing the hollow cylinder is generalized into a fixed hinged support.
The stress characteristic of the floating bollard structure of the ship lock refers to that the floating bollard in a working state is subjected to coupling effects of multiple physical fields such as dead weight, ship mooring force, water buoyancy, surge load, dynamic water resistance and the like, and a mooring frame on the upper part of the floating bollard is a part for directly acting the ship mooring force.
Step 2: based on a stretch-bending combined deformation analysis method in material mechanics, any stress point is selected on a floating mooring column body of a ship lock, and the strain characteristic relation of the point on the surface of the column body is analyzed, wherein the strain characteristic relation comprises axial tensile strain and bending strain.
A method for analyzing the combined deformation of tension and bending in material mechanics is disclosed, in which the floating mooring column in working state generates the combined deformation of tension and bending under the action of mooring cable.
And 2.1, forming the ship lock floating mooring column by using a linear elastic material, and conforming to Hooke's law. Mooring force axial component force FzProducing an axial stretch, namely:
Figure BDA0003288213820000051
the calculation formula of the obtained axial tensile strain is as follows:
Figure BDA0003288213820000061
in the formula: epsilon1Is the tensile strain of the surface of the floating mooring post of the ship lock; fzIs the vertical component of the mooring force; sigma is the tensile stress of the surface of the floating mooring column of the ship lock; a is the cross-sectional area of the ship lock floating mooring column; e is the elastic modulus of the ship lock floating mooring column; and a is the axial stretch coefficient.
And 2.2, under the action of the bending moment, the floating mooring column structure of the ship lock generates bending strain. The section bending moment M comprises FxyResulting bending moment MxyAnd FzResulting bending moment Mz。
For FxyResulting bending moment Mxy：
Mxy＝bFxy·(L1-h)·L2/L1；
In the formula, L1The length of a simply-supported section of the floating mooring column of the ship lock; l is2The length of a cantilever section of a floating mooring column of the ship lock; h is the distance from the strain measurement point to a simple support point on the floating mooring column of the ship lock; and b is a horizontal bending coefficient.
For FzResulting bending moment MzSince the mooring force acts on a semicircular cross section of a certain width in a surface force manner, therefore:
Figure BDA0003288213820000062
in the formula, R is the radius of an axial section ring of the floating mooring column of the ship lock; omega is an included angle between a connecting line of any point of the stress surface of the cylinder of the floating mooring column of the ship lock and the circle center and a neutral axis, and is shown in figure 4 (a); and c is the vertical bending coefficient.
Under pure bending, deducing a point bending strain of the cross section of the ship lock floating mooring column:
Figure BDA0003288213820000063
in the formula, epsilon2Bending strain of the surface of the floating mooring column of the ship lock; i is the inertia moment of a circular ring of the cross section of the ship lock floating mooring column; d is the perpendicular distance of the strain measurement point to the neutral axis.
Further, the strain characteristic relationship of any stress point on the surface of the ship lock floating mooring column is as follows:
Figure BDA0003288213820000064
and step 3: establishing a floating mooring post load mechanical response model in a working state;
step 3.1: as shown in fig. 3, at the designated highMooring force FfUnder the action, the distance between the mooring line of the ship mooring rope and the cross section of the measuring point is L2+ h, force analysis to obtain horizontal component force F of the mooring linexyAnd a vertical component force FzRespectively as follows:
Fxy＝Ffcosβ；
Fz＝Ffsinβ；
in the formula: beta is the included angle (vertical angle) between the cable and the horizontal plane;
step 3.2: as shown in fig. 5, three strain measurement points B, C, D are selected on the axial cross-sectional surface of the floating bollard measuring point of the ship lock, and at this time, h is 600mm, and the distances between the strain measurement point B, C, D and the neutral plane are respectively determined as follows:
dB＝R sinξ；
dC＝sin(ξ+μ)；
Figure BDA0003288213820000071
in the formula: r is the radius of the circular ring of the axial section of the floating mooring column of the ship lock; xi is an included angle between a straight line connecting the measuring point and the circle center and the neutral axis; mu is an included angle between the two measuring points B and C and a connecting line of the circle centers, and the included angle is 10 degrees;
Figure BDA0003288213820000072
the included angle between the two measuring points C and D and the connecting line of the circle center is 10 degrees;
step 3.3: alpha, xi, and,
Figure BDA0003288213820000073
The relationship between:
α＝90°+ξ-θ；
in the formula: alpha is the included angle (horizontal angle) between the cable and the gate wall line,
Figure BDA0003288213820000074
taking an angle of 80 degrees for an included angle between the measuring point B and a circle center connecting line and the gate wall line;
step 3.4: and (3) simultaneously setting formulas in the step 2, the step 3.1, the step 3.2 and the step 3.3 to obtain:
Figure BDA0003288213820000075
wherein a isB、bB、cBRespectively monitoring axial tension coefficient, horizontal bending coefficient and vertical bending coefficient of a B point by strain
Figure BDA0003288213820000076
Wherein a isC、bC、cCRespectively monitoring axial tension coefficient, horizontal bending coefficient and vertical bending coefficient of C point by strain
Figure BDA0003288213820000081
Wherein a isD、bD、cDRespectively monitoring axial tension coefficient, horizontal bending coefficient and vertical bending coefficient of a D point in strain
In the formula, epsilonB、εC、εDRespectively the strain of the strain monitoring points B, C, D,
Figure BDA0003288213820000082
Figure BDA0003288213820000083
further, based on the measured ε of strain monitor point B, C, D in step 3.2B、εC、εDSubstituting the formula in the step 3.4 to obtain the horizontal included angle alpha between the mooring rope of the ship and the gate wall line, the vertical included angle beta between the mooring rope and the horizontal plane and the mooring rope force F at the specified heightf。
And 4, step 4: the method adopts a floating mooring column simulation test under different working conditions to calibrate the axial tension coefficient, the horizontal bending coefficient and the vertical bending coefficient of a model, and comprises the following steps:
and 4.1, establishing a three-dimensional solid model of the upper structure of the floating mooring column of the ship lock according to the actual sizes of all parts of the floating mooring column of the ship lock, as shown in figure 6. During modeling, the ship lock floating mooring column component is considered to be a hollow thin-wall cylinder, and the top cover cap of the mooring column has no specific size, so that the original cover cap is replaced by the circular cover plate, and the action point of the mooring line is located at the central point of the top surface of the cylindrical mooring column. In addition, the vertical and horizontal rollers of the upper structure of the floating bollard are geometrically generalized during modeling, and are simplified into three-dimensional prisms, and the total number of the three-dimensional prisms is 8.
Step 4.2, importing the established three-dimensional entity model into finite element analysis software to generate a geometric model;
step 4.3, establishing a contact relation of adjacent parts, carrying out meshing by adopting a self-adaptive meshing method, and establishing a finite element analysis model;
step 4.4, applying load and boundary constraint conditions to the floating mooring columns according to the stress conditions of the floating mooring columns in the working state;
the load and boundary constraints are as follows:
wherein, the permanent load on the upper structure of the floating mooring column of the ship lock is considered as follows:
the method comprises the following steps: the structure is dead weight, and the direction is vertical and downward;
secondly, the step of: the buoyancy of water is equal to the self weight of the structure and opposite to the direction.
Applying surface constraint to the surfaces of the prism corresponding to the 8 transverse and longitudinal rollers in the floating bollard superstructure finite element model, namely: and constraining the displacement and the rotation angle of each node of each finite element on the surface in the directions of six degrees of freedom, so that the node cannot translate or rotate.
Furthermore, the horizontal included angle alpha between the cable and the lock wall line, the vertical included angle beta between the cable and the horizontal plane and the symmetry of the ship lock floating type mooring post are comprehensively considered, 5 horizontal numbers are considered in the variable load working condition of the ship lock floating type mooring post numerical simulation calculation, 3 factors and 5 levels are totally considered in the variable load working condition of the ship lock floating type mooring post numerical simulation calculation, and each level of each factor is matched with each otherPerforming comprehensive calculation, wherein the total calculation working condition is 53125 times.
TABLE 1 influence factors of variable load conditions in numerical simulation calculation
Figure BDA0003288213820000091
Further, the strain at the measuring point position of the column body B, C, D of the floating mooring column of the ship lock under 125 working conditions can be respectively obtained through the calculation of a numerical simulation model of the floating mooring column of the ship lock. B. The results of the strain calculation at the C, D measurement point are shown in fig. 7(a), 7(b), and 7(c), respectively.
And 4.5, selecting relevant parameters of the positions of the measuring points based on the calculation result of the numerical simulation test of the ship lock floating mooring column, and performing multiple linear regression analysis on the formula in the step 3.4 by using the basic principle of a least square method to obtain undetermined parameter values of the axial tension coefficient, the horizontal bending coefficient and the vertical bending coefficient in various formulas.
TABLE 2 Ship lock floating type bollard load response mechanics model related parameters
Figure BDA0003288213820000092

Claims (5)

1. A method for analyzing and calculating a ship lock floating mooring column in a working state is characterized by comprising the following steps: according to the stress characteristics of the ship lock floating mooring column structure, the upper structure of the ship lock floating mooring column is generalized into a simply supported overhanging beam; based on a stretch-bending combined deformation analysis method in material mechanics, selecting any stress point on a floating mooring column body of a ship lock, and analyzing the strain characteristic relation of the stress point on the surface of the column body; establishing a floating mooring post load mechanical response model in a working state; and (3) adopting floating mooring column simulation tests under different working conditions to calibrate the axial tension coefficient, the horizontal bending coefficient and the vertical bending coefficient of the model, and realizing analysis and calculation of the mooring force of the floating mooring column of the ship lock under the working state.
2. A method for analyzing and calculating a ship lock floating mooring column in a working state is characterized by comprising the following steps:
step 1: according to the stress characteristics of the structure of the ship lock floating mooring column, the column body of the hollow cylinder mooring column of the ship lock floating mooring column is generalized into an elastic beam with a uniform section, and a steel plate for fixing the hollow cylinder is generalized into a fixed hinged support;
step 2: based on a stretch-bending combined deformation analysis method in material mechanics, selecting any stress point on a floating mooring column body of a ship lock, and analyzing axial tensile strain and bending strain of the stress point on the surface of the column body;
and step 3: establishing a floating mooring post load mechanical response model in a working state;
and 4, step 4: and (3) adopting floating type bollard simulation tests under different working conditions to calibrate the axial tension coefficient, the horizontal bending coefficient and the vertical bending coefficient of the model.
3. The method for analyzing and calculating the floating bollard of the ship lock under the working condition as claimed in claim 2, wherein:
in the step 2, the calculation formula of the axial tensile strain is as follows:
Figure FDA0003288213810000011
in the formula: epsilon1Is the tensile strain of the surface of the floating mooring post of the ship lock; fzIs the vertical component of the mooring force; a is the cross-sectional area of the ship lock floating mooring column; e is the elastic modulus of the ship lock floating mooring column; a is the axial stretch coefficient;
the bending strain calculation formula is:
Figure FDA0003288213810000012
in the formula: epsilon2Bending strain of the surface of the floating mooring column of the ship lock; fxyIs a mooring ropeThe horizontal component of the force, I is the inertia moment of a circular ring of the cross section of the floating mooring column of the ship lock; d is the vertical distance from the strain measurement point to the neutral axis; r is the radius of the circular ring of the axial section of the floating mooring column of the ship lock; l is1The length of a simply-supported section of the floating mooring column of the ship lock; l is2The length of a cantilever section of a floating mooring column of the ship lock; h is the distance from the strain measurement point to a simple support point on the floating mooring column of the ship lock; b is a horizontal bending coefficient, and c is a vertical bending coefficient;
the strain characteristic relation of any stress point on the surface of the floating mooring column of the ship lock is as follows:
Figure FDA0003288213810000021
4. the method for analyzing and calculating the floating bollard of the ship lock under the working condition as claimed in claim 3, wherein: the step 3 comprises the following steps:
step 3.1: mooring force F at a given heightfUnder the action, the distance between the mooring line of the ship mooring rope and the cross section of the measuring point is L2+ h, force analysis to obtain horizontal component force F of the mooring linexyAnd a vertical component force FzRespectively as follows:
Fxy＝Ffcosβ；
Fz＝Ffsinβ；
in the formula: beta is the included angle between the cable and the horizontal plane;
step 3.2: on the axial section surface of a measuring point of a floating bollard of a ship lock, three strain measuring points B, C, D are selected, and the distances between the strain measuring point B, C, D and a neutral plane are respectively calculated as follows:
dB＝R sinξ；
dC＝sin(ξ+μ)；
Figure FDA0003288213810000022
in the formula: r is the radius of the circular ring of the axial section of the floating mooring column of the ship lock; xi is an included angle between a straight line connecting the measuring point and the circle center and the neutral axis; mu is an included angle between the two measuring points B and C and a connecting line of the circle centers; phi is an included angle between a connecting line of the C measuring point and the D measuring point and the circle center;
step 3.3: determining the relationship between α, ξ, θ for the axial section:
α＝90°+ξ-θ；
in the formula: alpha is the included angle between the cable and the gate wall line, and theta is the included angle between the measuring point B and the line of the circle center and the gate wall line;
step 3.4: the formula in step 2, step 3.1, step 3.2 and step 3.3 is combined, and the strain of the strain monitoring point B, C, D is solved to be epsilonB、εC、εDRespectively as follows:
Figure FDA0003288213810000023
Figure FDA0003288213810000031
Figure FDA0003288213810000032
in the formula (I), the compound is shown in the specification,
Figure FDA0003288213810000033
5. the method for analyzing and calculating the floating bollard of the ship lock under the working condition as claimed in claim 2, wherein: the step 4 comprises the following steps:
step 4.1: establishing a three-dimensional entity model of the floating mooring column of the ship lock according to the actual sizes of all parts of the floating mooring column of the ship lock;
step 4.2, importing the established three-dimensional entity model into finite element analysis software to generate a geometric model;
step 4.3, establishing a contact relation of adjacent parts, carrying out meshing by adopting a self-adaptive meshing method, and establishing a finite element analysis model;
step 4.4, applying load and boundary constraint conditions to the floating mooring columns according to the stress conditions of the floating mooring columns in the working state;
and 4.5, selecting relevant parameters of the positions of the measuring points based on the calculation result of the numerical simulation test of the ship lock floating mooring column, and performing multiple linear regression analysis on the formula in the step 2 by using the basic principle of a least square method to obtain undetermined parameter values in various formulas.
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CN111397784A (en) * 2020-04-20 2020-07-10 长江三峡通航管理局 Online monitoring system and method for mooring force of floating mooring columns of high-lift lock
CN111695198A (en) * 2020-06-03 2020-09-22 重庆交通大学 Automatic sensing and early warning system for stress characteristics of ship lock floating mooring column

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1219568A (en) * 1967-01-24 1971-01-20 George Leslie Gore Improvements in or relating to ship's mooring devices
CN104316250A (en) * 2014-09-11 2015-01-28 浙江海洋学院 On-line monitoring apparatus of ship mooring force and monitoring method thereof
CN104517036A (en) * 2014-12-22 2015-04-15 华中科技大学 Simply-supported piece damage identification method based on strain statistical moment
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