CN112084686B - Cable structure form finding analysis method - Google Patents

Cable structure form finding analysis method Download PDF

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CN112084686B
CN112084686B CN202010823344.8A CN202010823344A CN112084686B CN 112084686 B CN112084686 B CN 112084686B CN 202010823344 A CN202010823344 A CN 202010823344A CN 112084686 B CN112084686 B CN 112084686B
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cable structure
cable
design
requirements
construction
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CN112084686A (en
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王泽强
胡洋
周黎光
吕李青
杜彦凯
支超
刘鲁
高晋栋
张致豪
苏浩
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Beijing Building Construction Research Institute Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation

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Abstract

The invention discloses a cable structure form finding analysis method, which comprises the following steps: 1. establishing a cable structure zero-state geometric model; 2. inputting a prestress value to determine the initial form of the cable structure; 3. carrying out various load state analysis to determine whether the standard requirements are met; if the requirement of the specification is met, the initial form of the cable structure is the design form of the cable structure; if the requirements do not meet the standard requirements, parameters are modified, the step 1 is returned, and finally the cable structure design form is found; 4. carrying out simulation calculation in the whole construction process to obtain a new cable structure state; 5. comparing the new form of the cable structure with the design form of the cable structure, and judging whether the error is acceptable; if the cable structure can be accepted, the new form of the cable structure is the form of the cable structure; if not, modifying the parameters, returning to the step 1, and finally finding out the cable structure form; the invention can meet the requirements of standard stress, deformation and the like, and can also meet the requirement of the geometrical configuration of the cable structure, so that the configuration of the cable structure is infinitely close to the design requirement.

Description

Cable structure form finding analysis method
Technical Field
The invention relates to the technical field of prestressed cable structure products, in particular to a cable structure form finding analysis method.
Background
With the development of society and the progress of science and technology, the house building not only has the function of meeting the use function of human, but also has the requirements of bearing culture and aesthetic. The prestressed large-span spatial structure building has novel, attractive and light appearance, fully utilizes the material performance, becomes one of the most development potential structural forms in the current structural engineering, and the large-span spatial cable structure is a new structural form generated by following the trend. The large-span cable structure has no rigidity before prestress is applied, and is a flexible structure system, and the whole structure has certain rigidity and bears load by means of the prestress, so that the cable structure is the key point for realizing the structure system.
In the prior art, when the cable structure form-finding analysis is performed, the cable structure form-finding analysis is generally performed by a designer of a design unit, that is, the traditional cable structure form-finding analysis method is only a theoretical form-finding analysis process, however, in the cable structure construction process, because the adopted construction method rarely adopts the erection of full framing scaffolds, one-time forming, installation, tensioning and forming, and generally adopts staged installation and batch tensioning and forming, even if a graded symmetrical tensioning method is adopted, the forming of the actual forming process and the design process is not identical, and because in the actual construction process, the zero state of the cable structure is not the zero state of the design drawing due to construction deviation, processing errors and other reasons, the existing cable structure form-finding method does not consider the influence of the construction process on the structure forming, the traditional cable structure form-finding analysis method cannot accurately reflect the whole construction process, and the final forming state does not meet the design drawing requirements.
Disclosure of Invention
The invention aims to provide a cable structure form-finding analysis method, which solves the problems in the prior art, fully considers the characteristics that a cable structure system generates larger displacement and internal force can be redistributed in the forming process and shows strong geometric nonlinearity, and can meet the requirements of standard stress, deformation and the like and the requirement of the cable structure form geometric configuration, so that the cable structure form is infinitely close to the design requirement.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a cable structure form finding analysis method, which is applied to a cable structure, wherein the cable structure comprises a plurality of inhaul cables, the inhaul cables are installed and connected at nodes, and the cable structure form finding analysis method comprises the following steps:
(1) Establishing a cable structure zero-state geometric model;
(2) Inputting a cable prestress value, carrying out shape finding analysis, and preliminarily determining the initial form of the cable structure;
(3) Checking the structural performance of various load combination states to determine whether the structural performance meets the standard requirements; if the requirement of the specification is met, the initial form of the cable structure is the design form of the cable structure; if the specification requirement is not met, modifying the parameters, returning to the step (1), and finally finding out the design form of the cable structure;
(4) Carrying out simulation calculation analysis on the cable structure design form in the whole construction process to obtain a new cable structure form;
(5) Comparing the new form of the cable structure with the design form of the cable structure, and judging whether the error is acceptable; if the cable structure can be accepted, the new form of the cable structure is a cable structure forming form; if not, modifying the parameters, returning to the step (1), and finally finding the knot structure type.
Preferably, when the cable structure zero-state geometric model is established in the step (1), the corresponding nodes are constrained according to design requirements, and material characteristics and section characteristics of each structural part are established according to the design requirements to obtain zero-state cable structure node coordinates (x) 0 ，y 0 ，z 0 )。
Preferably, in step (2), the coordinates (x) of the nodes of the cable structure of the initial form are extracted according to the initial form of the cable structure 1 ，y 1 ，z 1 )。
Preferably, the specification requirements in step (3) include internal force, stress, displacement, deformation; the modified parameters comprise the prestress value of the stay cable, the section of the component and the material property.
Preferably, finite element software ANSYS or MIDSA GEN is adopted in the step (4), a model of the cable structure design form obtained in the step (3) is established, simulation calculation and analysis are carried out in the whole cable structure construction process according to a given construction method or a construction scheme, distribution of force in the structure is sought by adjusting self-stress of the cable structure to reach a balanced state through each construction step, and construction errors and structural member size errors are considered in calculation.
Preferably, the new-form cable structure node coordinate (x) is obtained in the step (4) according to the new form of the cable structure 2 ，y 2 ，z 2 ) Coordinate (x) of the node of the cable structure of the initial form 1 ，y 1 ，z 1 ) There is a coordinate difference (Δ x) between i ，△y i ，△z i ) And judging the influence degree of the construction method on the structural mechanical property and the structural integral deformation of the cable structure, and obtaining the deformation angle of the single cable of the theoretical model in the plane through coordinate comparison.
Preferably, step (5) is performed based on said coordinate difference (Δ x) i ，△y i ，△z i ) The size and the spatial position, and parameters are adjusted in a targeted manner, wherein the parameters comprise the initial prestress value of the inhaul cable or the section characteristics of the structural member.
Compared with the prior art, the invention achieves the following technical effects:
(1) The invention obtains the cable structure design form meeting the standard requirement on the basis of the cable structure initial form, then carries out the simulation calculation analysis of the whole construction process to obtain the cable structure new form, compares the cable structure new form with the cable structure design form, returns to the cable structure initial form to recalculate and analyze when the cable structure new form does not meet the requirement, circulates in this way, finally finds the cable knot formation form, can meet the requirements of standard stress, deformation and the like, and can also meet the requirement on the cable knot formation form geometric configuration, so that the cable knot formation form is infinitely close to the design requirement;
(2) When simulation calculation analysis is carried out in the whole construction process, structural construction deviation and material processing errors possibly caused on site are considered, the calculation analysis process is ensured to be infinitely close to actual construction, and parameters such as overall structure configuration, cable force, component stress and the like are inevitably different from the traditional configuration finding method without considering the construction process due to the fact that the whole construction process of the flexible cable structure is considered, so that the configuration finding method can be further optimized, the deviation between theoretical configuration finding analysis and actual construction results is reduced, and a cable structure forming pattern which is closer to the design requirement is obtained;
(3) According to the invention, the cable structure forming form is obtained by comparing and optimizing the new form of the cable structure and the cable structure design form, and the process can analyze and calculate the stress condition of each cable so that each cable meets the design requirement, therefore, the integral rigidity of the cable structure can be further enhanced, and the load bearing requirement can be met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of an embodiment of a method for shape-finding analysis of a cable structure.
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.
The invention aims to provide a cable structure form-finding analysis method, which solves the problems in the prior art, fully considers the characteristics that a cable structure system can generate larger displacement and redistribute internal force in the forming process and shows strong geometric nonlinearity, can meet the requirements of standard stress, deformation and the like, and can also meet the requirement of the form geometric configuration of a cable structure, so that the form of the cable structure is infinitely close to the design requirement.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
As shown in fig. 1, the present invention provides a cable structure form-finding analysis method, which is applied to a cable structure, wherein the cable structure includes a plurality of cables, the cables are installed and connected at nodes, the connection between the cables and the node structure generally adopts a hinge joint, and of course, the cable structure also includes other structural members, which are not described herein again, and the cable structure form-finding analysis method of the present invention includes the following steps:
(1) Establishing a cable structure zero-state geometric model, namely establishing a space model according to the geometric coordinates of each node of the cable structure given by a designer, wherein the space model is the cable structure zero-state geometric model;
(2) Inputting a cable prestress value, and calculating, namely, carrying out preliminary shape-finding analysis on the cable structure zero-state geometric model, and further preliminarily determining a cable structure model obtained after the shape-finding analysis as a cable structure initial form;
(3) According to relevant standard requirements, applying various load combinations to the cable structure, checking the structural performance of various load combination states, judging according to a calculation result, and determining whether the standard requirements are met; if the requirement of the specification is met, the initial form of the cable structure is the design form of the cable structure; if the specification requirement is not met, modifying the parameters, returning to the step (1), and finally finding out the design form of the cable structure;
(4) The cable structure design form is subjected to simulation calculation analysis in the whole construction process by adopting analysis software, structural construction deviation and material processing errors possibly caused on site are considered in the calculation analysis process, the calculation analysis process is infinitely close to actual construction, the new cable structure form is obtained through the calculation analysis, the new cable structure form and the cable structure design form are not completely the same, and generally, a large difference exists;
(5) The overall construction process of the flexible cable structure is considered, so that parameters such as overall structure configuration, cable force, component stress and the like are different from the traditional shape finding method without considering the construction process, even partial parameters do not meet the standard requirements, the new form of the cable structure is compared with the design form of the cable structure, and whether errors can be accepted is judged; if the cable structure can be accepted, the new form of the cable structure is the form of the cable structure; and if not, modifying the parameters, returning to the step (1), updating the coordinates of each node of the cable structure, recalculating and analyzing, and performing multiple cycles of calculation and analysis to finally find the cable structure forming form.
The method comprises the steps of obtaining a cable structure design form meeting the standard requirement on the basis of the cable structure initial form, then carrying out simulation calculation analysis in the whole construction process to obtain a cable structure new form, comparing the cable structure new form with the cable structure design form, returning to the cable structure initial form for recalculation analysis when the cable structure design form does not meet the requirement, circulating in the way, and finally finding the cable structure form, so that the cable structure form can meet the requirements of standard stress, deformation and the like, and can also meet the requirement of the cable structure form geometric configuration, and the cable structure form is enabled to be infinitely close to the design requirement;
when simulation calculation analysis is carried out in the whole construction process, structural construction deviation and material processing errors possibly caused on site are considered, the calculation analysis process is ensured to be infinitely close to actual construction, and parameters such as overall structure configuration, cable force, component stress and the like are inevitably different from the traditional configuration finding method without considering the construction process due to the fact that the whole construction process of the flexible cable structure is considered, so that the configuration finding method can be further optimized, the deviation between theoretical configuration finding analysis and actual construction results is reduced, and a cable structure forming pattern which is closer to the design requirement is obtained;
further, when the cable structure zero-state geometric model is established in the step (1), corresponding nodes are constrained according to design requirements, and material characteristics and section characteristics of each structural part are established according to the design requirements to obtain a zero-state cable structure node coordinate (x) 0 ，y 0 ，z 0 )。
Further, extracting the coordinates (x) of the nodes of the cable structure of the initial form according to the initial form of the cable structure in the step (2) 1 ，y 1 ，z 1 )。
Further, the specification requirements in the step (3) include internal force, stress, displacement, deformation and the like; the modified parameters include the cable prestress value, the member section, the material characteristics and the like.
Further, in the step (4), finite element software ANSYS or MIDSA GEN is adopted, a model of the cable structure design form obtained in the step (3) is established, simulation calculation and analysis are carried out in the whole process of cable structure construction according to a set construction method or a set construction scheme, distribution of internal force of the structure is sought by adjusting self-stress of the cable structure to reach a balanced state through each construction step, and construction errors and structural part size errors are considered in calculation.
Further, in the step (4), a node coordinate (x) of the cable structure in the new form is obtained according to the new form of the cable structure 2 ，y 2 ，z 2 ) Coordinate (x) of the original form cable structure node 1 ，y 1 ，z 1 ) There is a coordinate difference (Δ x) between i ，△y i ，△z i ) And judging the influence degree of the construction method on the structural mechanical property of the cable structure and the integral deformation of the structure, and obtaining the deformation angle of a single cable of the theoretical model in the plane through coordinate comparison.
Further, in step (5), the coordinate difference (delta x) is used as a basis i ，△y i ，△z i ) The size and the spatial position of the inhaul cable can be used for pertinently adjusting parameters such as the initial prestress value of the inhaul cable or the section characteristics of the structural member.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.

Claims (1)

1. A cable structure form finding analysis method is characterized by comprising the following steps: be applied to cable structure, cable structure includes many draglines, the dragline is at node erection joint, including following step:
(1) Establishing a cable structure zero-state geometric model; constraining corresponding nodes according to design requirements, establishing material characteristics and section characteristics of each structural member according to the design requirements, and obtaining a zero-state cable structure node coordinate (x) 0 ，y 0 ，z 0 )；
(2) Inputting a cable prestress value, carrying out shape finding analysis, and preliminarily determining the initial form of the cable structure; extracting initial form cable structure node coordinate (x) 1 ，y 1 ，z 1 )；
(3) Checking the structural performance of various load combination states to determine whether the structural performance meets the standard requirements; if the requirement of the specification is met, the initial form of the cable structure is the design form of the cable structure; if the cable structure does not meet the standard requirement, modifying the parameters, returning to the step (1), and finally finding out the design form of the cable structure;
(4) Carrying out simulation calculation analysis on the whole construction process of the cable structure design form according to a given construction method or a construction scheme to obtain a new cable structure form; new form cable structure node coordinate (x) 2 ，y 2 ，z 2 ) Coordinates (x) of the nodes of the cable structure of said initial form 1 ，y 1 ，z 1 ) There is a coordinate difference (Δ x) between i ，Δy i ，Δz i ) Judging the influence degree of the construction method on the structural mechanical property of the cable structure and the integral deformation of the structure, and obtaining the deformation angle of a single cable of the theoretical model in the plane through coordinate comparison;
(5) Comparing the new form of the cable structure with the design form of the cable structure according to the coordinate difference (Deltax) i ，Δy i ，Δz i ) Size and spatial position, adjusting parameters in a targeted manner, and judging whether errors are acceptable; if the cable structure is acceptable, the new form of the cable structure is the cable structure forming form; if not, modifying the parameters, returning to the step (1), and finally finding the knot forming form;
the specification requirements in the step (3) comprise internal force, stress, displacement and deformation; the modified parameters comprise the prestress value of the inhaul cable, the section of the component and the material property;
in the step (4), finite element software ANSYS or MIDSA GEN is adopted, a model of the cable structure design form obtained in the step (3) is established, simulation calculation analysis is carried out on the whole cable structure construction process, the distribution of the force in the structure is sought by adjusting the self-stress of the cable structure to reach a balance state in each construction step, and construction errors and structural part size errors are considered in the calculation;
and (5) the parameters comprise the initial prestress value of the inhaul cable or the structural member section characteristics.
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CN102720295B (en) * 2012-04-04 2013-07-31 中国航空规划建设发展有限公司 Prestress determination method based on tension and whole loading process simulation analysis of cable dome
US9892213B2 (en) * 2012-06-18 2018-02-13 China Aviation Planning & Construction Development Asymmetric cable-membrane tensegrity structure of opening type, method of constructing the same and method of designing the same
CN107338963B (en) * 2017-07-17 2019-05-31 中建三局第一建设工程有限责任公司 A kind of over-the-counter construction method for hanging of super-span truss string structure
CN108897943A (en) * 2018-06-26 2018-11-27 北京工业大学 A kind of rung formula Cable Truss Structure digital simulation pre-assembly method based on BIM model
CN111062148B (en) * 2020-01-13 2022-11-18 东南大学 Cable structure integral self-balancing prestress force finding analysis method based on full-structure construction process

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