CN110728094A - Novel overall structure pseudo-static test method - Google Patents
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Abstract
A novel whole structure pseudo-static test method belongs to the field of whole pseudo-static tests of large structures; the anti-seismic performance of the whole structure cannot be reflected by the level pseudo-static test of partial structures and components; establishing a numerical model of an integral structure, and setting initial values of material parameters; selecting a reasonable structural part or member as a test substructure; selecting a whole structure pseudo-static force loading system according to the test procedure, determining a loading position, performing single-step pseudo-static force loading analysis on the whole structure, and obtaining an accurate loading command of the test substructure at the current step; transmitting a loading command to a test substructure loading system to complete loading, and feeding test observation data back to the constitutive parameter identification module; the constitutive parameter identification module is only used for identifying constitutive parameters of the material of the test substructure on line by using test loading observation data, updating material parameters corresponding to the numerical model of the overall structure on line, and not returning the test loading observation data to the pseudo-static analysis of the overall structure; the seismic performance of the overall structure is effectively inspected.
Description
Technical Field
The invention belongs to the field of overall pseudo-static tests of large structures, and particularly relates to a novel overall structure pseudo-static test method.
Background
The structural seismic test method mainly comprises the following steps: a pseudo-static test method, a seismic simulation shaking table test method and a structural hybrid test method (pseudo-dynamic test). The pseudo-static test is the structural seismic test method which is most widely used for testing the structural seismic performance, and is the most effective test means particularly for large-scale complex structures, novel structural systems and seismic reduction and isolation components. The method is used for carrying out multiple slow reciprocating loading on a test body according to a preset loading path, so that the test body undergoes loading and unloading processes in the positive direction and the negative direction, and the anti-seismic performance of the test body in reciprocating vibration during earthquake is disclosed. The pseudo-static test can effectively obtain important information of strength, rigidity, deformation, energy consumption and the like of a structural member (assembly), and provides powerful technical support for revealing a structural failure mode, checking the effectiveness of structural anti-seismic construction measures and establishing a structural restoring force model. However, due to the limitation of the space of the laboratory and the capability of loading equipment, the whole structure of the most of laboratories can hardly complete the full-scale pseudo-static test at present. The traditional pseudo-static test is mainly used for carrying out partial structure and component level tests or carrying out a reduced-scale structure test. However, compared with the whole structure pseudo-static test, the partial structure and member level pseudo-static test cannot reflect the whole structure anti-seismic performance, such as: destruction mechanism, bearing capacity, deformability and energy consumption capacity.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides a novel overall structure pseudo-static test method, combines the sub-structure pseudo-static loading test and the overall structure pseudo-static loading analysis, and effectively tests the anti-seismic performance of the overall structure.
The technical scheme of the invention is as follows:
a novel overall structure pseudo-static test method comprises the following steps:
step a, establishing a numerical model of an integral structure, and setting initial values of constitutive parameters of a material;
b, selecting a reasonable structural part or member in the overall structure as a test substructure, and designing a test substructure loading scheme;
step c, selecting a whole structure pseudo-static force loading system according to a test procedure, determining a loading position, performing single-step pseudo-static force loading analysis on the whole structure, and obtaining a loading target at the boundary freedom degree of the test substructure in the current step, namely obtaining an accurate loading command of the test substructure;
d, transmitting the loading target to a test substructure loading system, completing the loading in the current step, and feeding test observation data back to the constitutive parameter identification module;
and e, the constitutive parameter identification module only uses the test loading observation data to identify the constitutive parameters of the material of the test substructure on line, updates the material parameters corresponding to the numerical model of the overall structure on line, and does not return the test loading observation data to the pseudo-static analysis of the overall structure.
And f, repeating the steps c to e until the test is finished.
Further, the step a is to discretize the whole structure into a numerical model of the whole structure in the finite analysis software.
Further, said selecting in step b of a reasonable structural part or member as the test substructure is a structure or member for providing a model parameter update part as the test substructure.
Further, the test substructure loading system in step d comprises a loading counterforce device, an actuator, a test substructure, a measuring device and a test loading control system.
Further, in the step d, the constitutive parameter identification module correctly obtains the restoring force model parameters of the test substructure from the physical observed quantity containing the noise through a parameter estimation method.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a novel overall structure pseudo-static test method, which combines a substructure pseudo-static loading test and an overall structure pseudo-static loading analysis and effectively tests the anti-seismic performance of the overall structure. Obtaining an integral structure reaction through integral structure pseudo-static analysis; the accurate loading command of the test substructure is obtained through the overall analysis result, and the coupling effect influence between the test object and other parts of the structure can be considered; the reaction force of the test substructure is not returned to the pseudo-static analysis of the overall structure, and is only used for identifying parameters of the constitutive model on line, and the pseudo-static analysis of the overall structure model updated by the online model is carried out to obtain the structural reaction, so that the real anti-seismic performance of the overall structure is evaluated; and an online constitutive model parameter updating method is adopted for the whole structure, so that the model precision in the pseudo-static numerical analysis is improved.
Drawings
FIG. 1 is a diagram of a test substructure loading apparatus;
FIG. 2 is a schematic diagram of the present invention;
FIG. 3 is a flow chart of the present invention;
FIG. 4 is a graph comparing hysteresis curves of structures;
FIG. 5 is a graph comparing the time course of the restoring force of the two layers of the structure;
FIG. 6 is a flow diagram of a constitutive parameter identification module.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Detailed description of the invention
A novel overall structure pseudo-static test method comprises the following steps:
step a, establishing a numerical model of an integral structure, and setting initial values of constitutive parameters of a material;
b, selecting a reasonable structural part or member in the overall structure as a test substructure, and designing a test substructure loading scheme;
step c, selecting a whole structure pseudo-static force loading system according to a test procedure, determining a loading position, performing single-step pseudo-static force loading analysis on the whole structure, and obtaining a loading target at the boundary freedom degree of the test substructure in the current step, namely obtaining an accurate loading command of the test substructure;
and d, transmitting the loading target to a test substructure loading system, completing the loading in the current step, and feeding test observation data back to the constitutive parameter identification module.
And e, the constitutive parameter identification module only uses the test loading observation data to identify the constitutive parameters of the material of the test substructure on line, updates the material parameters corresponding to the numerical model of the overall structure on line, and does not return the test loading observation data to the pseudo-static analysis of the overall structure.
And f, repeating the steps c to e until the test is finished.
Specifically, the step a is to discretize the whole structure into a numerical model of the whole structure in the finite analysis software.
In particular, said selecting in step b of a reasonable structural part or component as the test substructure is a structure or component for providing a model parameter update part as the test substructure.
Specifically, the test substructure loading system in the step d comprises a loading counterforce device, an actuator, a test substructure, a measuring device and a test loading control system.
Specifically, in the step d, the constitutive parameter identification module correctly obtains the restoring force model parameters of the test substructure from the physical observed quantity containing noise through a parameter estimation method.
The embodiment combines the substructure pseudo-static force loading test and the overall structure pseudo-static force loading analysis, and effectively tests the anti-seismic performance of the overall structure. In the embodiment, the integral structure reaction is obtained through the integral structure pseudo-static analysis; the accurate loading command of the test substructure is obtained through the overall analysis result, and the coupling effect influence between the test object and other parts of the structure can be considered; the test substructure reaction force of the embodiment is not returned to the whole structure pseudo-static analysis, and is only used for identifying the parameters of the constitutive model on line, and the structural reaction is obtained through the whole structure model pseudo-static analysis updated by the on-line model, so that the anti-seismic performance of the whole structure is evaluated; and an online constitutive model parameter updating method is adopted for the whole structure, so that the model precision in the pseudo-static numerical analysis is improved.
The present embodiment can be applied to fields including, but not limited to, civil engineering, traffic, bridges, aerospace, machinery, and the like. For example, a novel structural system pseudo-static test, a vehicle-bridge coupling pseudo-static test, an electric power and communication equipment pseudo-static test and the like are developed.
Detailed description of the invention
On the basis of the first embodiment, the invention is implemented by taking a two-layer single-span plane steel frame structure as an example, and as shown in fig. 2 and 3, the invention comprises the following steps:
step a, discretizing the integral structure into a numerical model of the integral structure in finite element analysis software, and setting initial values X of material constitutive parameters of the numerical model of the integral structure0,；
B, selecting a substructure for providing a model parameter updating part in the overall structure, mounting the substructure for providing the model parameter updating part and related parts thereof on a loading counterforce device to serve as a test substructure, arranging two displacement sensors at the top and the base of the steel structure cantilever column of the test substructure, measuring the actual displacement and the base slippage of the top of the column, and connecting the displacement sensors to an external input channel of a mechanical test system controller;
step c, sending the displacement d of the step k to the degree of freedom corresponding to the numerical model of the whole structure by using a previously selected pseudo-static loading systemkUsing the displacement d of step kkAnd the constitutive parameters of the model in the step k-1
Carrying out nonlinear static analysis on the numerical model of the integral structure in finite element analysis software;
displacement in test substructure boundary degrees of freedom to be calculated in finite element analysis software
Sending to an actuator connected to the test substructure;
step d, calculating the displacement of the actuator on the boundary freedom degree of the test substructure according to finite element analysis software
Loading the test piece, and measuring the displacement obtained by actual measurement
And reaction force
Sending the estimation result to an constitutive parameter identification module for estimating constitutive parameters of the model;
e, estimating the constitutive parameter identification module on line, taking a hidden Kalman filter as an example for explanation, and taking the constitutive parameter of the model in the step k-1
Calculating constitutive model parameter sampling points for basis
Sampling points of constitutive model parameters
And the displacement actually measured
Sending the data to a numerical model of the test substructure, namely, waiting for the test substructure, performing nonlinear static analysis once, and calculating the obtained restoring force
Feeding back to the parameter estimation module, and then using the calculated restoring force
Actually measured restoring forceAnd the parameter estimation value of the previous step
Calculating new constitutive model parameters
With newly estimated constitutive model parametersUpdating constitutive model parameters in integral finite element model
And f, repeating the steps c to e until the test is finished.
Specifically, as shown in fig. 1, the device is a test substructure loading device in a two-layer single-span planar steel frame overall structure pseudo-static test, and comprises an actuator 1, a reaction wall 2, a test piece 3, a first linear displacement sensor 4 and a second linear displacement sensor 5; the connection relationship is shown in fig. 1.
Specifically, as shown in fig. 6, for a process of embedding openses' hidden kalman filter in online parameter identification, Matlab sends a load displacement and a parameter sample point to openses, and after openses uses the parameter sample point for calculation, returns a required member restoring force sample point to Matlab. In this process, openses is required to update corresponding parameters of the constitutive model of the equivalent test substructure with newly obtained sample points when receiving new sample points, and then perform loading calculation. And openses needs to have a function of saving all history variables of each step and returning to a previous step of computing state after the current step of analysis is finished.
Specifically, 1/2 of a layer of frame column is taken as a test substructure for test loading, and the measurement content of the test substructure is as follows: the actual displacement D1 of the top of the substructure post, the substrate slip D2 of the substructure and the restoring force of the substructure were tested. The actual displacement of the column top of the test substructure is measured by a second Linear displacement transducer (LVDT) arranged at the column top of the cantilever column, the base slip of the test substructure is measured by a second Linear displacement transducer arranged at the bottom of the cantilever column test piece, and the restoring force of the test substructure is measured by a load cell carried by the actuator itself. The actual measured displacements sent to the numerical model of the test substructure were calculated as D1-D2. The results of the two-layer single-span plane steel frame integral structure pseudo-static test are shown in fig. 4 and 5.
The present embodiment illustrates the present invention by taking a pseudo-static test of the whole structure of a two-layer single-span planar steel frame as an example. In order to more comprehensively check the failure mode, the bearing capacity, the deformation capacity, the energy consumption capacity and the effectiveness of structural seismic structure measures of the frame structure, a pseudo-static test research needs to be carried out on the whole structure. The method is limited by test conditions and funds, and cannot perform integral full-scale test on the two-layer single-span plane steel frame.
Claims (5)
1. A novel overall structure pseudo-static test method is characterized by comprising the following steps:
step a, establishing a numerical model of an integral structure, and setting initial values of constitutive parameters of a material;
b, selecting a reasonable structural part or member in the overall structure as a test substructure, and designing a test substructure loading scheme;
step c, selecting a whole structure pseudo-static force loading system according to a test procedure, determining a loading position, performing single-step pseudo-static force loading analysis on the whole structure, and obtaining a loading target at the boundary freedom degree of the test substructure in the current step, namely obtaining an accurate loading command of the test substructure;
d, transmitting the loading target to a test substructure loading system, completing the loading in the current step, and feeding test observation data back to the constitutive parameter identification module;
step e, the constitutive parameter identification module is only used for identifying constitutive parameters of the material of the test substructure on line by using test loading observation data, updating material parameters corresponding to the numerical model of the overall structure on line, and not returning the test loading observation data to the pseudo-static analysis of the overall structure;
and f, repeating the steps c to e until the test is finished.
2. A novel whole structure pseudo-static test method according to claim 1, characterized in that, in the step a, the manner of establishing the numerical model of the whole structure is to discretize the whole structure into the numerical model of the whole structure in the finite analysis software.
3. A novel whole structure pseudo-static test method according to claim 1, characterized in that, said selecting reasonable structural parts or components as test substructures in step b is the structure or component for providing model parameter updating parts as test substructures.
4. A novel whole structure pseudo-static test method as claimed in claim 1, wherein the test substructure loading system in step d comprises a loading counterforce device, an actuator, a test substructure, a measuring device and a test loading control system.
5. A novel whole structure pseudo-static test method as claimed in claim 1, wherein in step d, said constitutive parameter identification module correctly obtains the restoring force model parameters of the test substructure from the noisy physical observation quantity by a parameter estimation method.
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| CN112100873A (en) * | 2020-07-23 | 2020-12-18 | 北京中水科海利工程技术有限公司 | Method for determining bearing capacity of hydraulic building |
| CN114707390A (en) * | 2022-05-05 | 2022-07-05 | 哈尔滨工业大学 | Mixed test method and analysis method based on updating constitutive parameters of layered shell material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111400874B (en) * | 2020-02-29 | 2024-03-26 | 同济大学 | Virtual hybrid power test method for underground structure |
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