This specification is applicable to the dynamic characteristics test of natural and artificial foundations of various buildings and structures. GB/T 50269-1997 Specification for dynamic characteristics test of foundation GB/T50269-1997 Standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
GB/T50269-97
Code for measurement method ofdynamic properties of subsoilConstruction Standard
1997-09-12Release
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full-text Information System
1998-05-01
Jointly Issued
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code for measurement method ofdynamic properties of subsoil GB/T50269—97
Editor Department: Ministry of Machinery Industry of the People's Republic of ChinaApproval Department: Ministry of Construction of the People's Republic of ChinaEffective Date: May 1, 1998
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the Release of National Standard
"Specification for Testing Dynamic Characteristics of Foundation"
Jianbiao [1997] No. 281
According to the requirements of Document No. Jizong [1986] 2630 of the State Planning Commission, the "Specification for Testing Dynamic Characteristics of Foundation" formulated by the Ministry of Machinery Industry in conjunction with relevant departments has been reviewed by relevant departments. The "Specification for Testing Dynamic Characteristics of Foundation" GB/T50269—97 is now approved as a recommended national standard, which will be implemented on May 1, 1998. The Ministry of Machinery Industry is responsible for the management of this standard, the Ministry of Machinery Industry Research Institute is responsible for the specific interpretation, and the Ministry of Construction Standard and Quota Research Institute is responsible for the publication and distribution. Ministry of Construction of the People's Republic of China
September 12, 1997
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
Terms and Symbolswww.bzxz.net
2.1 Terms
Basic Provisions
Vibration Test
General Provisions
Equipment and Instruments
Preparation before Test·
Test Methods
Data Processing…·
Conversion of Foundation Dynamic Parameters
Vibration Test Dynamic attenuation test
General provisions
Test methods
Data processing
Ground pulsation test
General provisions
Equipment and instruments
Test methods
Data processing
Wave velocity test
General provisions
7.2 Equipment and instruments
7.3 Test methods*
7.4 Data processing
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Engineering Construction Standard Full-text Information System
8 Cyclic load plate test
General provisions
Equipment and instruments
Preparation before testing
Test methods.·
Data processing
Vibration triaxial and resonant column tests
-General provisions·
Equipment and instruments·
Test methods
Data processing…
Appendix A
Appendix B||tt ||Appendix C
Appendix D
Appendix E
Appendix F
Calculation table of dynamic parameters of foundation tested by excitation methodVibration attenuation test record table
Wave velocity test record table
Cyclic load plate test record table
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Vibration triaxial and resonant column test record table
Explanation of terms used in this specification
Additional explanation
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Engineering Construction Standard Full-text Information System
1 This specification is formulated in order to unify the test methods for dynamic characteristics of foundation, ensure the test quality, and provide reliable dynamic parameters for engineering design. 1.0.2
2This specification is applicable to the dynamic characteristics test of natural and artificial foundations of various buildings and structures.
1.0.3 The test of foundation dynamic characteristics shall be carried out according to the actual needs of the project, using one or more of the following test methods, and determining the foundation dynamic parameters on the basis of analysis and comparison. For the foundation dynamic parameters required for the design of power machinery foundation, the vibration method must be used for testing. (1) Vibration method test;
(2) Vibration attenuation test;
(3) Ground pulsation test;
(4) Wave velocity test;
(5) Cyclic load plate test;
(6) Vibration triaxial and resonant column test.
1.0.4 In addition to complying with the provisions of this specification, the test of foundation dynamic characteristics shall also comply with the provisions of the relevant current national standards and specifications. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
2 Terms and Symbols
2.1 Terms
Horizontal Rotational Coupled Vibration Vibration Coupled with Translating and Rocking
The foundation translates along one horizontal axis and simultaneously generates rotational vibration around another horizontal axis.
2.1.2 Micro-tremor
The inherent weak (micrometer-level) vibration on the earth's surface caused by natural forces such as meteorology, ocean and crustal tectonic activities and human factors such as transportation. 2.1.3 Compressional wave compressional wave The wave in which the displacement direction of particles in the medium is equal to the direction of wave propagation. 2.1.4 Shear wave shear wave
The wave in which the displacement direction of particles in the medium is perpendicular to the direction of wave propagation. 2.1.5 Number of cycles to cause failure The number of cycles of equal amplitude stress required for the sample to reach the failure standard. 2.1.6 Dynamic strength ratio ratioof dynamic shear strengthRatio of dynamic shear strength on the 45° surface of the specimen to the initial normal effective stress. 2.1.7 Frequency ratiocycleratio
Ratio of frequency of vibration under dynamic stress to the frequency of failure vibration. 2.1.8 Dynamic pore pressure ratiodynamicporepresureratioRatio of pore water pressure increment of the specimen under cyclic stress to the lateral effective consolidation stress.
2.1.9 Dynamic shear stress ratio
ratioofdynamicshearstress
Ratio of dynamic shear stress on the 45° surface of the specimen to the lateral effective consolidation stress. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
2.1.10ratio of dynamic shear modulus
ratioofdynamicshearmodulus
The ratio of the dynamic shear modulus corresponding to a certain shear strain amplitude to the maximum dynamic shear modulus under the same consolidation stress conditions.
1 Action and effect
The resonant amplitude of the vertical vibration of the foundation;
The horizontal amplitude of the resonance peak of the first vibration mode of the horizontal rotary coupled vibration of the foundation
The vertical amplitude of the resonance peak of the first vibration mode of the horizontal rotary coupled vibration of the foundation,
The horizontal amplitude of the resonance peak of the torsional vibration of the foundation; The damped natural frequency of the foundation;
The resonant frequency of the vertical vibration of the foundation,
The resonant frequency of the first vibration mode of the horizontal rotary coupled vibration of the foundation; The vertical undamped natural frequency of the foundation;
The undamped natural frequency of the first vibration mode of the horizontal rotary coupled vibration of the foundation; The horizontal undamped natural frequency of the foundation;
The undamped natural frequency of the rotation of the foundation;
The resonant frequency of the torsional vibration of the foundation;
The undamped natural frequency of the torsional vibration of the foundation; The resonant frequency of the torsional vibration of the specimen system; The resonant frequency of the longitudinal vibration of the specimen system. Calculation index
-compressive stiffness of foundation;
-shear stiffness of foundation;
-bending stiffness of foundation;
-torsional stiffness of foundation;
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compressive stiffness of single pile;
-bending stiffness of pile foundation;
-vertical damping ratio of foundation;
-damping ratio of horizontal rotation to the first vibration mode of foundation;-torsional damping ratio of foundation;
- The mass of the test foundation;
The total mass of the vertical vibration of the foundation, including the equivalent mass of the foundation, the excitation device and the ground participating in the vibration;
The total mass of the horizontal rotational coupled vibration of the foundation, including the equivalent mass of the foundation, the excitation device and the ground participating in the vibration; The total mass of the torsional vibration of the foundation, including the equivalent mass of the foundation, the excitation device and the ground participating in the vibration;
Compression wave velocity;
Shear wave velocity;
- Rayleigh wave velocity;
- Foundation energy Absorption coefficient;
dynamic Poisson's ratio of foundation;
mass density of foundation;
-dynamic elastic modulus of foundation;
-shear modulus of foundation;
-shear strain modulus of specimen;
axial strain amplitude of specimen;
-torsional damping ratio of specimen;
longitudinal damping ratio of specimen;
axial dynamic stress amplitude of specimen;
-average effective principal stress,
-effective major principal stress;
-effective minor Principal stress;
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Engineering Construction Standard Full-text Information System
Initial normal effective stress on the potential rupture surface; initial shear stress on the potential rupture surface;
dynamic strength on the potential rupture surface;
seismic total stress shear strength on the potential rupture surface; dynamic strength ratio on the 45° surface of the specimen;
-foundation deformation when loading;
-plastic deformation of the foundation when unloading;
-elastic deformation of the foundation.
Geometric parameters
-test foundation bottom area
sample diameter;
-test foundation height;
distance from the foundation center of gravity to the foundation top surface;
distance from the foundation center of gravity to the foundation bottom surface;
distance from the foundation center of gravity to the horizontal disturbance force of the exciter; sample height,
burying depth of test foundation;
moment of inertia of the foundation bottom about its centroidal axis; polar moment of inertia of the foundation bottom about its centroidal axis, moment of inertia of the foundation bottom about its centroidal axis; polar moment of inertia of the foundation bottom about its centroidal axis. Calculation parameters
Increase coefficient of foundation burial depth on foundation compressive stiffness;Increase coefficient of foundation burial depth on foundation shear stiffness;Increase coefficient of foundation burial depth on foundation bending stiffness;-Increase coefficient of foundation burial depth on foundation torsional stiffness;Increase coefficient of foundation burial depth on vertical damping ratio;xo
Increase coefficient of foundation burial depth on damping ratio of horizontal rotation to first vibration mode,
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
一一Increase coefficient of foundation burial depth on torsional damping ratio;Burial depth ratio of test foundation;
一一Conversion coefficient related to foundation bottom area and bottom static stress. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3 Basic Provisions
1 When testing the dynamic characteristics of the foundation on site, the following information should be available:3.0.1
(1) Geological survey data of the construction site;(2) Plan and longitudinal drawings of underground pipelines, cables, etc. at the construction site;(3) Interference vibration sources at the construction site and its vicinity.2 Before testing the dynamic characteristics of the foundation, a test plan should be formulated based on the selected test method. The test plan should include the following contents:(1) Test purpose and requirements;
(2) Test load, loading method and loading equipment;(3) Test content, specific method and measurement point instrument layout diagram;(4) Data processing method;
(5) When testing by vibration excitation method, a location diagram of embedded bolts or reserved bolt holes should be available. 3.0.3
3During on-site testing, the test equipment and instruments should be protected from wind, rain, snow, sun and drop.
3.0.4The test site should be away from external interference sources, and the test points should be away from cement, asphalt pavement, underground pipelines and cables.
3.0.5The test report should include original data, test results, analysis opinions and test conclusions.
Engineering Construction Standard Full Text Information System5 The test report should include original data, test results, analysis opinions and test conclusions.
Engineering Construction Standards Full Text Information System5 The test report should include original data, test results, analysis opinions and test conclusions.
Engineering Construction Standards Full Text Information System
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