GB/T 50344-2019 English PDFGB/T 50344: Historical versions
Basic dataStandard ID: GB/T 50344-2019 (GB/T50344-2019)Description (Translated English): Technical standard for inspection of building structure Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: P20 Classification of International Standard: 91.080.01 Word Count Estimation: 297,245 Date of Issue: 2019-11-22 Date of Implementation: 2020-06-01 Older Standard (superseded by this standard): GB/T 50344-2004 Quoted Standard: GB 50003; GB 50005; GB 50009; GB 50010; GB 50011; GB 50016; GB 50017; GB 50023; GB 50068; GB/T 50081; GB/T 50082; GB/T 50107; GB/T 50129; GB 50144; GB/T 50152; GB 50153; GB 50203; GB 50204; GB 50205; GB 50206; GB 50292; GB 50300; GB/T 50315; GB/T 50329 Regulation (derived from): Ministry of Housing and Urban-Rural Development Announcement No. 311 (2019) Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation Summary: This standard applies to building structure testing and building structure evaluation. GB/T 50344-2019: Technical standard for inspection of building structure---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 unify the inspection and evaluation methods of building structures, achieve advanced technology, reliable data, and scientific evaluation. 1.0.2 This standard applies to the detection and evaluation of building structures. 1.0.3 Cultural relic buildings and structures or components affected by special corrosive substances can be tested according to the provisions of this standard. 1.0.4 The inspection and evaluation of building structures shall not only comply with the provisions of this standard, but also comply with the relevant current national standards. 2 Terms and symbols 2.1 Terminology 2.1.1 Inspection of building structure Inspection work implemented to assess the quality of building structure engineering or identify the performance of existing building structures. 2.1.2 Inspection batch inspection lot The test items are the same, the quality requirements and production processes are basically the same, and the test objects are composed of a certain number of components. 2.1.3 sampling inspection sampling inspection Samples are drawn from the test batch, and the test method for the quality of the test batch is determined by testing the samples. 2.1.4 Testing zone An area with one or several measuring points arranged according to the requirements of the detection method. 2.1.5 Testing point In the survey area, the detection points of the detection data are obtained. 2.1.6 method of non-destructive test During the detection process, the detection method has no influence on the existing performance of the structure. 2.1.7 method of part-destructive test During the detection process, there is a partial and temporary impact on the existing performance of the structure, but the detection method can be repaired. 2.1.8 Rebound method It is a method to detect the compressive strength and strength homogeneity of materials by measuring the rebound value and related parameters. 2.1.9 Ultrasonic-rebound combined method A method for detecting the compressive strength of concrete by measuring the ultrasonic sound velocity value and rebound value of concrete. 2.1.10 drilled core method A method of testing the strength of a material by drilling a cylindrical test piece from a structure or member. 2.1.11 Ultrasonic method A method for detecting defects and compressive strength of non-metallic materials by measuring relevant acoustic parameters of ultrasonic pulse waves. 2.1.12 post-install pull-out method A method for testing the compressive strength of concrete by installing a pull-out instrument on the hardened concrete surface to test the pull-out force. 2.1.13 Penetration method A method for detecting the strength of component materials by measuring the penetration depth of steel nails. 2.1.14 The method of axial compression in situ on brick wall A method for testing the compressive strength of masonry by performing a compressive test on a brick wall with an in-situ press. 2.1.15 The method of flat jack A compression test is carried out on a brick wall with a flat hydraulic jack to detect the compressive stress, modulus of elasticity and compressive strength of the brick wall. 2.1.16 in situ single shear method the method of single shear A method of testing the shear strength of a masonry wall by performing a shear test along a single horizontal mortar joint in the masonry wall. 2.1.17 The method of double shear A method for testing the shear strength of a brick wall by performing a double-sided shear test on a single block of bricks. 2.1.18 The method of point load A method for estimating the compressive strength of masonry mortar by applying a point load on the large surface of the mortar sheet. 2.1.19 The method of local compression on mortar flake The local compressive test is carried out on the mortar sheet specimen by the partial pressure instrument, and the method of estimating the compressive strength of the masonry mortar according to the local compressive load value; it can also be called the selective pressure method. 2.1.20 cylinder pressure method the method of column The sampled mortar is crushed, dried and sieved into particles with a certain gradation requirement, loaded into a pressure-bearing cylinder and subjected to a cylinder pressure load, the degree of fragmentation is measured, and the cylinder pressure ratio is used to test the compressive strength of the masonry mortar. 2.1.21 Ultrasonic inspection A method of detecting metal material or weld defects using an ultrasonic flaw detector. 2.1.22 Radiographic inspection A method for detecting steel or weld defects from fluorescent screens or negative films obtained by transilluminating steel workpieces with X-rays or γ-rays. 2.1.23 magnetic partide inspection It is a method to detect defects such as cracks on the surface and near the surface of steel based on the magnetic marks formed by the magnetic powder on the surface of the test piece. 2.1.24 penetrant inspection A method of detecting cracks on the surface of a material using a penetrant. 2.1.25 normal height The vertical height of a certain location of the building relative to ±0.000. 2.1.26 axis displacement displacement of axes The deviation between the actual position of the structure or component axis and the design requirements can also be called axis deviation. 2.1.27 degree of gravity vertical Within the specified height range, the degree to which the surface of the component deviates from the line of gravity. 2.1.28 degree of plainness The degree of unevenness on the surface of a structural member. 2.1.29 Dimensional errors The difference between the actual geometry and the design geometry. 2.1.30 deflection deflection Under the action of load, etc., the linear displacement in the direction perpendicular to the original axis or neutral plane caused by deflection at a certain point on the axis or neutral plane of the structural member. 2.1.31 deformation deformation The relative displacement between two points in a structure or member caused by an action. 2.1.32 cellular honeycomb Defects such as stone exposure and looseness on the concrete surface of the component due to lack of slurry. 2.1.33 pockmark Defects such as pits, pits and air bubbles appear on the concrete surface due to lack of slurry. 2.1.34 hole cavitation A cavity in concrete that exceeds the thickness of the reinforcement cover. 2.1.35 reveal of reinforcement The defect that the steel bars in the component are not wrapped by concrete and are exposed. 2.1.36 crack map cracking A network of cracks present on the surface of a component. 2.1.37 crack A gap extending from the surface of a building structural component into the component. 2.1.38 loose loose Localized non-compacting defects in concrete. 2.1.39 Concrete slag inclusion Defects that contain impurities in the concrete and whose depth exceeds the thickness of the protective layer. 2.1.40 weld slag inclusion Slag remaining in the weld after welding. 2.1.41 Weld defects weld defects Cracks, slag inclusions, pores, etc. in the weld. 2.1.42 corrosion corrosion The physical and chemical changes of building components in direct contact with environmental media lead to the deterioration of materials. 2.1.43 Rust Corrosion of metal materials due to the electrochemical action of moisture and oxygen. 2.1.44 damage damage Abnormal displacement, deformation, cracking, and damage and deterioration of materials caused by load, environmental erosion, disasters, and human factors. 2.1.45 mean mean The average level of random variable values is also referred to as the 0.5th percentile value in this standard. 2.1.46 variance variance A random variable takes the average of the square of the difference between its value and its mean. 2.1.47 standard deviation standard deviation The positive square root of the variance of a random variable. 2.1.48 sample mean sample mean Arithmetic mean of samples X1,, XN. 2.1.49 sample variance sample variance The sum of the squares of the differences between the sample components and the sample mean is the numerator, and the denominator is the sample size minus 1. 2.1.50 sample standard deviation sample standard deviation The positive square root of the sample variance. 2.1.51 sample sample A group (one or more) of individuals drawn from the population (test batch) according to a certain procedure. 2.1.52 Individual item An area or component for which an inspection or inspection data representative value can be obtained independently. 2.1.53 sample size sample size The number of individuals included in the sample. 2.1.54 standard value characteristic value A random variable has a characteristic value with a 95% guaranteed rate, which is also called the 0.05th percentile value of the distribution function in this standard. 2.2 Symbols 2.2.1 Material strength f1—— masonry block strength; f1,m—sample mean value of masonry block compressive strength; fcu,e - estimated value of concrete strength; fcor—converted compressive strength of the core sample. 2.2.2 Statistical parameters m—sample mean; s—sample standard deviation; μ——mean value or detection batch mean value; σ——Standard deviation of detection batches. 2.2.3 Calculation parameters △——correction amount; η——Correction coefficient. 2.2.4 Reliable indicators βR—reliable index of component bearing capacity; βS - a reliable indicator of action effect. 2.2.5 Coefficient of variation δR—coefficient of variation of member bearing capacity; δS—the nominal coefficient of variation of the action effect. 2.2.6 Partial coefficient γF—the comprehensive sub-item coefficient of the effect; γR—partial coefficient of member bearing capacity. 3 Basic Regulations3.1 Classification of building structure detection 3.1.1 The inspection of building structure should be divided into the inspection of structural engineering quality and the inspection of existing structural performance. 3.1.2 In case of any of the following situations, a third-party inspection agency should be entrusted to inspect the quality of structural engineering. 1.The testing stipulated by the current relevant national standards; 2 Insufficient quantity of structural engineering samples sent for inspection or lack of relevant inspection data; 3 The results of construction quality sample inspection or self-inspection by relevant parties do not meet the design requirements; 4 Doubts or disputes about the construction quality; 5 A quality or safety accident occurs; 6 The inspections required by the project quality insurance; 7 Doubts or disputes about the engineering quality of existing building structures; 8 Structures that have not been inspected for construction quality as required. 3.1.3 The inspection of structural engineering quality should be carried out to judge the conformity of the inspection conclusion. 3.1.4 Existing structures should be tested for the performance of the existing structures when the following assessments or appraisals are required. 1 Reliability assessment of building structures; 2 Building safety and seismic appraisal; 3 Assessment before building overhaul; 4 Evaluation before the building is changed in use, remodeled, added floors or expanded; 5 The assessment that the building structure will continue to be used after reaching the design service life; 6 Assessment of buildings affected by natural disasters and environmental erosion; 7.Assessment of emergencies or special problems found. 3.1.5 Existing structural performance testing should provide true, reliable and effective data and testing conclusions for structure assessment. 3.1.6 For structures affected by external human factors, a combination of structural engineering quality testing and existing structural performance testing can be adopted. 3.2 Basic requirements for testing work 3.2.1 On-site investigation and data investigation should be carried out before building structure inspection. 3.2.2 On-site investigation and data investigation shall include the following contents. 1 Collect engineering geological survey reports, as-built drawings or design and construction drawings, construction quality acceptance records and other materials of the tested structures; 2 Collect data on maintenance, testing, evaluation, reinforcement and transformation of building structures during their use; 3 Investigate the actual conditions of the detected building structure defects, damage, repair and reinforcement; 4 Investigate the actual conditions of the tested building structure environment, use or load, etc.; 5 Investigate the reasons for entrusting testing with relevant personnel and the problems that cannot be revealed in data investigation and on-site investigation. 3.2.3 The building structure inspection plan shall be compiled on the basis of on-site investigation and data investigation, and the client's opinion shall be sought for the building structure inspection plan. 3.2.4 The testing plan for building structures should include the following main technical contents. 1 Project overview or structural overview; 2 The purpose of testing or the testing requirements of the entrusting party; 3 testing basis; 4.Testing items, selected testing methods and testing quantity; 5 testing personnel and equipment; 6 Inspection work progress plan; 7 Coordination work required; 8 Safety measures and environmental protection measures in testing. 3.2.5 The instruments and equipment used for building structure testing shall meet the following requirements. 1.The accuracy of the instruments and equipment should meet the requirements of the testing items; 2.The instruments and equipment should be in the verification or calibration period during the test and should be in a normal state. 3.2.6 The original records of building structure testing shall meet the following requirements. 1 The original record should be recorded on a special recording paper, and the information should be complete and the handwriting should be clear; 2 The clerical errors in the original records should be corrected; 3 When thermal output records are used, a photocopy of the original should be attached; 4 The original records should be signed by the testing and recording personnel. 3.2.7 The test pieces or samples taken on-site for building structure testing shall be marked and properly preserved. 3.2.8 When it is found that the amount of test data is insufficient or the test data is abnormal, supplementary testing or re-testing should be performed. 3.2.9 The local damage detection method should choose the part of the structural member with less stress; after the on-site inspection of the building structure is completed, the local damage of the structure or member caused by the inspection should be repaired in time. 3.2.10 When inspecting cultural relic buildings and protected buildings, damage to structures should be avoided. 3.2.11 After the calculation and analysis of building structure inspection data is completed, the inspection report should be submitted in time. 3.2.12 The inspection report of structural engineering quality shall make a judgment on the compliance of the inspected items with the requirements of the design documents. The test report of the existing structural performance shall give the test conclusions of the tested items. 3.2.13 The building structure inspection report should have accurate conclusions, standardized wording, and concise text, and can explain in writing the terms and concepts that are easily confused by the parties. 3.3 Testing method and sampling plan 3.3.1 For the inspection of building structures, the applicable inspection, testing, observation and monitoring methods should be selected according to the inspection purpose, inspection items, building structure conditions and site conditions. 3.3.2 The testing of structural engineering quality should adopt the direct test method stipulated in the current relevant national standards; when the indirect test method stipulated in the current relevant national standards is selected, the test results of the direct test method should be used to correct the test results of the indirect test method. 3.3.3 Direct test method The amendment to the indirect test method shall comply with the relevant provisions of Appendix A of this standard. 3.3.4 The testing of the performance of the existing structure, when the testing and evaluation are carried out by the same organization, the following methods can be used. 1.The methods stipulated in the relevant current national standards; 2 Test methods to expand the scope of application of the method in paragraph 1; 3 Adjust the detection method of the operational measures in paragraph 1; 4 The detection method developed or introduced by the testing unit itself. 3.3.5 When the indirect test method stipulated in the current relevant national standards is adopted and the method has exceeded the scope of application or the test operation is adjusted, the test results of the direct test method should be used to verify or correct the test results of the indirect test method. The verification of indirect test methods by direct test methods shall comply with the relevant provisions of Appendix A of this standard. 3.3.6 When adjusting the operational measures stipulated in the relevant current national standards, the following regulations should still be met. 1 The testing unit should have detailed testing rules for corresponding testing operations; 2 The testing unit shall inform the entrusting party in advance. 3.3.7 The use of self-developed or imported testing methods shall comply with the following regulations. 1 The method must pass the technical appraisal and should have practical experience in engineering testing; 2 The method should be compared with the existing mature method in advance; 3 The testing unit should have corresponding testing rules; 4 It should be stated in the testing plan, and the testing rules should be provided to the entrusting party if necessary. 3.3.8 Building structure testing should be based on the requirements of the entrusting party and the characteristics of the testing items to determine the testing objects and the number of testing in the following ways. 1 Full detection plan; 2.Random sampling plan for test batches; 3 Determine the scheme of important testing batches; 4 Determine the plan for the important test items and objects of the test batch; 5.According to the requirements of the entrusting party, adopt the scheme of special structural inspection technology. 3.3.9 It is advisable to adopt a full testing plan for the verification and inspection of the following items. 1 Arrangement of components of structural system and inspection of important structures; 2 Verification of support nodes and connection forms; 3 On-site inspection of visible defects and visible damage of structural members, support nodes and connections; 4 Inspection of obvious displacement, deformation and deviation of structural members. 3.3.10 The counting and testing items of the test batch should be randomly sampled once or twice according to the quantity specified in Table 3.3.10. Table 3.3.10 Minimum sample size for sampling inspection of building structures Note. 1 Testing category A is applicable to the testing of general project construction quality; it can be used for general project testing of existing structures; 2 Inspection category B is suita......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 50344-2019_English be delivered?Answer: Upon your order, we will start to translate GB/T 50344-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 50344-2019_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 50344-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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