GB/T 50152-2012 English PDFUS$989.00 · In stock
Delivery: <= 9 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 50152-2012: Standard for test method of concrete structures Status: Valid GB/T 50152: Historical versions
Basic dataStandard ID: GB/T 50152-2012 (GB/T50152-2012)Description (Translated English): Standard for test method of concrete structures Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: P25 Word Count Estimation: 130,176 Older Standard (superseded by this standard): GB 50152-1992 Quoted Standard: GB 50009; GB 50010; GB/T 50081; GB 50153; GB 50204; GB/T 50344 Regulation (derived from): Bulletin of the Ministry of Housing and Urban No. 1268 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Summary: This standard applies to buildings and general structures of reinforced concrete structures, prestressed concrete structural tests, including: laboratory tests, precast test structures in situ loading tests, structural monitoring and dynamic characteristi GB/T 50152-2012: Standard for test method of concrete structures---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 This standard is formulated in order to ensure the quality of concrete structure tests, study and correctly evaluate the performance of concrete structures and components, and unify the test methods of concrete structures. 1.0.2 This standard is applicable to the tests of reinforced concrete structures and prestressed concrete structures of houses and general structures, including. laboratory tests, prefabricated component tests, structural in-situ loading tests, structural monitoring and dynamic characteristic tests. Tests with special requirements, structural tests under high temperature, negative temperature, corrosive media and other environmental conditions, as well as other types of tests on concrete structural members, shall comply with the current relevant national standards or special test requirements. 1.0.3 In addition to the requirements of this standard, the concrete structure test shall also comply with the relevant current national standards. 2 Terms and symbols 2.1 Terminology 2.1.1 Specimen The object of the structural test, the concrete structure or member used for loading and measurement during the test. 2.1.2 exploratory test exploratory test Experiments to explore structural performance and laws for the purpose of scientific research and development of new technologies (materials, processes, structural forms). 2.1.3 Verifying test Tests conducted for the purpose of confirming scientific research assumptions and calculation models, and verifying the reliability of new technologies (materials, processes, and structural forms). 2.1.4 laboratory test laboratory test An exploratory or confirmatory test that simulates the stress state of a structure or component under laboratory conditions. 2.1.5 test of prefabricated members Tests conducted to verify the structural performance of prefabricated component products. 2.1.6 field loading test in situ loading test On-site loading and measurement tests of existing engineering structures. 2.1.7 structural monitoring A test of ongoing measurements on a structure during construction or in use. 2.1.8 Dynamic performance test test for structural dynamic parameters Tests to test the dynamic characteristic parameters of the structure and the effects of dynamic loads. 2.1.9 Equivalent loading equivalent loading Simulate the actual stress state of the structure or component, so that the main internal forces on the control section of the specimen are equal or similar to the loading method. 2.1.10 loading mode loading mode The form of test load arrangement on the specimen, including load type, action position and loading method, etc. 2.1.11 Critical load value of tests In the test, control the load value of each specific force state of the specimen, including the self-weight of the specimen and the weight of the loading equipment. 2.1.12 Test load value for serviceability limit states The load value corresponding to the limit state of the structure during the test is determined by conversion based on the calculated value of the internal force of the design control section of the component and the test loading mode. 2.1.13 design load value for ultimate limited states Under the limit state of bearing capacity, the load value determined by conversion is based on the internal force design value on the design control section of the component and the test loading mode. 2.1.14 Load coefficient coefficient of loading During the bearing capacity test, the multiples of the critical test load values corresponding to different bearing capacity signs relative to the load design value of the bearing capacity state. 2.1.15 test load value for load-bearing capacity The load value corresponding to the limit state of the structural bearing capacity during the test is the product of the load design value of the bearing capacity state, the loading factor, and the structural importance factor for the confirmatory test. 2.1.16 additional test load value The actual load value applied to the specimen after deducting the self-weight of the specimen and the weight of the loading equipment during the test. 2.1.17 Test mark mark of inspection A test phenomenon or measurement limit observed when the test piece reaches a defined critical state. 2.1.18 Test calculated value predicted value of tests According to the analysis model, the estimated value of the test piece is calculated and determined according to the actual index of the material. 2.1.19 Coefficient of crack-resisting inspection The ratio of the measured value of the cracking test load of the specimen to the test load value of the service state. 2.1.20 Coefficient of load-bearing inspection The ratio of the actual test load value of the test piece bearing capacity to the design value of the bearing capacity state load. 2.2 Symbols 2.2.1 Material properties 2.2.2 Actions and action effects G - self-weight of the test piece; W——loading equipment weight; 2.2.3 Calculation coefficient and others 3 Basic Regulations3.0.1 Before the concrete structure test, the test plan should be formulated according to the purpose of the test. The test protocol should include the following. 1 Test purpose. the background of the test and the purpose to be achieved; 2 Specimen plan. design of test specimens, selection of specimens in prefabricated component tests, selection of specimens or test areas in structural in-situ loading tests and structural monitoring, etc.; 3 Loading scheme. support and loading mode of specimen, load control method, load classification, loading limit, load holding time, unloading procedure, etc. For structural monitoring, the mode of load action should be determined according to the actual engineering situation; 4 Measurement plan. determine the measurement items required for the test, the arrangement of measurement points, the selection of instruments, the installation method, the measurement accuracy, and the range review; 5 Judgment criteria. According to the purpose of the test, determine the test marks when the test reaches different critical states, as the standard for judging the structural performance; 6 Safety measures. measures to ensure the personal safety of test personnel and the safety of equipment and instruments. When performing in-situ loading tests and structural monitoring on structures, it is advisable to avoid irreversible permanent damage to the structure. 3.0.2 Test records should be completed at the test site, and key data should be analyzed and judged in real time. The data, text and diagrams recorded in the field test shall be true, clear and complete, and shall not be altered arbitrarily. The original record of structural test shall be signed by the recorder, and should include the following contents. 1 Test results of mechanical properties of steel bars and concrete materials; 2 Observation and inspection records of shape and size measurement and appearance quality of test specimens; 3 Observation and description of phenomena during the test loading process; 4 Instrument reading data records and crack sketches during the test; 5.Description of critical states such as specimen deformation, cracking, crack width, yield, bearing capacity limit, etc.; 6 Description of the failure process and failure form of the specimen; 7 Test video recording. 3.0.3 The preliminary collation and analysis of test records should include the following contents. 1 The relationship curve between load and displacement or deformation; 2 Deformation or displacement distribution diagram of the test piece; 3 The number of cracks in the test piece, the table or curve of crack width growth; 4 Crack pattern and description of the test piece; 5 The damage state and nature of the test piece; 6 Corresponding sorting and preliminary analysis should also be carried out on the reading data of other relevant test parameters. 3.0.4 After the test is over, the following analysis should be carried out on the test results. 1.The description of test phenomena should be based on the measured loading process, combined with the measured steel and concrete strains, to describe the generation and development of concrete cracks, the stress of steel bars, the critical state, and the characteristics and forms of final failure under various loads; 2 According to the purpose of the test, the loading-displacement relationship and loading-strain relationship of the test piece should be analyzed to obtain the measured load values of the cracking, yielding and ultimate bearing capacity of the test piece and the corresponding displacement and ductility index equivalent values, and analyze other needs to be discussed. and verified content; 3 For exploratory tests, the main parameters affecting the structural performance should be determined according to the test results of the series of test pieces, the mechanism of force and the law of change should be analyzed, and new theoretical or empirical formulas should be derived in combination with existing theories. To guide more in-depth scientific research or engineering practice; 4 For the confirmatory test, the existing structural theories, calculation methods and construction measures shall be reviewed and verified according to the test results and preliminary analysis of the specimen, and suggestions for improvement and perfection shall be put forward. 3.0.5 The test report should include the following contents. 1 Test overview. test background, test purpose, component name, test date, test unit, test personnel and record number, etc.; 2 Test plan. specimen design, loading equipment and loading method, measurement plan; 3 Test records. record loading procedures, instrument readings, test phenomenon data, text, images and video materials; 4 Result analysis. collation of test data, preliminary analysis of test phenomena and stress mechanism; 5 Test conclusion. Judgment and conclusion based on test and analysis results. 3.0.6 The test report should be accurate and comprehensive, and should meet the following requirements. 1 The test report should meet the requirements of the test purpose and test plan; 2 The rounding off of test data should meet the operation rules, and the calculation accuracy should meet the corresponding requirements; 3 The charts in the test report should be accurate and clear; 4 If necessary, the error analysis between test parameters and test results should be carried out. 3.0.7 Test records and test reports should be sorted and properly archived.4 Material properties4.0.1 The parameters related to material properties used for calculation and analysis in the concrete structure test shall be determined through actual measurement. 4.0.2 The concrete performance parameters of the specimens in the laboratory test can be determined according to the following methods when there is reliable experience. 1 For the concrete of each strength grade poured in the same batch, no less than 6 cubic test blocks shall be made as a group and cured under the same conditions as the test samples; when the test period is long, the number of test sample groups should be appropriately increased; When measuring the strength of concrete of different ages or other special requirements, the number of groups of test blocks can be appropriately increased according to the needs of the test; 2 The measured value of concrete cube compressive strength should be in the measured value of compressive strength of each group of cube test blocks, remove the maximum and minimum values, and take the average value of the measured compressive strength of the remaining test blocks; 3 According to the measured value of the concrete cube compressive strength, calculate the performance parameters such as the axial compressive strength, axial tensile strength and elastic modulus of the concrete according to the following formula, and use it as the basis for calculation and analysis. 4 The concrete test block test method for determining material properties shall comply with the relevant provisions of the current national standard "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" GB/T 50081. 4.0.3 The performance test of the reinforced material of the specimen shall comply with the following regulations. 1 Steel bar samples should be taken from the same batch of steel bars used to make test pieces, and no less than 2 samples should be taken for each specification of steel bars according to relevant standards; 2 The yield strength, ultimate strength, modulus of elasticity and total elongation under the maximum force of steel bars shall be determined as required; 3.The measured value of the material property of the steel bar shall be the average value of the test results of the material property of the steel bar; 4 When the test is required, the stress-strain curve of the reinforcement can be determined; 5 According to the purpose of the test, tests such as cold bending, repeated bending, impact toughness, weldability, and mechanical connection performance can also be carried out. 4.0.4 When it is necessary to further verify the material parameters of the test piece, after the test is completed, the concrete core sample or the steel bar sample can be directly drilled from the less stressed part of the test piece to supplement the mechanical performance test. 4.0.5 When conducting structural in-situ loading tests and structural monitoring, it is advisable to test and evaluate the properties of steel bars and concrete materials in the structure according to the current national standards "Technical Standards for Building Structure Testing" GB/T 50344 and other methods., and should meet the following requirements. 1 When conditions permit, the performance parameters should be determined according to the construction data or the existing test data of material performance; 2 The sampling of structural solid materials should be representative; 3 The sampling of material samples shall reduce the damage to the existing structure; 4 The physical strength of concrete materials should be determined through comprehensive analysis based on the results obtained by no less than two testing methods. 4.0.6 When other materials, components and steel bar welding, mechanical connection, anchor clamps and connectors of prestressing tendons, planting bars, slurry-anchor joints, etc. have obvious influence on the test results, performance tests shall also be carried out.5 Test loading5.1 Support device 5.1.1 The support of the test specimen should meet the following requirements. 1 The supporting device shall ensure that the boundary constraint conditions and stress state of the test specimen conform to the calculation diagram of the test scheme; 2 The device supporting the specimen should have sufficient rigidity, bearing capacity and stability; 3 The supporting device of the test piece should not produce deformation that affects the normal stress and test accuracy of the test piece; 4 In order to ensure the close contact of the supporting surface, the upper and lower steel backing plates of the supporting device should be pre-embedded in the test piece or the pier; mortar or dry sand can also be used to level the steel backing plate with the test piece and the buttress. When the specimen bears a large support reaction force, local pressure check calculation should be carried out. 4 Before the test, the load should be weighed to obtain its average weight; 5 Loads should be stacked separately, and the accumulation length along the span direction of the one-way or two-way stressed specimen should be about 1m, and should not be greater than 1/6-1/4 of the span of the specimen; 6 A gap of not less than 50 mm should be reserved between piles to avoid arching after deformation of the specimen (Fig. 5.2.10). 5.2.11 When using bulk materials for uniform loading, the following requirements shall be met. 1 Bulk materials can be counted and loaded after being weighed in bags, or lateral enclosures can be set around the loading area on the upper surface of the component, weighed and loaded step by step and evenly spread out (Figure 5.2.11); 2 When loading, it should avoid leakage of loaded solids. 5.2.12 When fluid (water) is used for uniform loading, effective measures to prevent leakage such as water bladders, cofferdams and water-proof membranes shall be provided (Fig. 5.2.12). The loading can be controlled by converting the depth of the water into a load, or by a flow meter. 5.2.13 When carrying out the internal pressure loading test on the sealed container, air pressure or water pressure can be used for uniform loading (Figure 5.2.13a); it can also be loaded by means of air bag or water bag relying on the fixture (Figure 5.2.13b); add... ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 50152-2012_English be delivered?Answer: Upon your order, we will start to translate GB/T 50152-2012_English as soon as possible, and keep you informed of the progress. The lead time is typically 6 ~ 9 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 50152-2012_English with my colleagues?Answer: Yes. 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