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GB 50982-2014: Technical code for monitoring of building and bridge structures Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB 50982-2014: Technical code for monitoring of building and bridge structures---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50982-2014UDC GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA P GB 50982-2014 Technical code for monitoring of building and bridge structures Issued on. OCTOBER 09, 2014 Implemented on. AUGUST 01, 2015 Issued by. Ministry of Housing and Urban-Rural Development of PRC; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Technical code for monitoring of building and bridge structures Compiled by. Ministry of Housing and Urban-Rural Development of PRC Approved by. Ministry of Housing and Urban-Rural Development of PRC Date of implementation. August 01, 2015 China Building Industry Press 2014 Beijing Announcement of Ministry of Housing and Urban-Rural Development of the People's Republic of China No. 583 Table of ContentsForeword... 6 1 General provisions... 8 2 Terms and symbols... 8 2.1 Terms... 8 2.2 Symbols... 10 3 Basic requirements... 10 3.1 General requirements... 10 3.2 Monitoring system, point and equipment... 11 3.3 Construction monitoring... 14 3.4 Post construction monitoring... 18 4 Monitoring methods... 21 4.1 General requirements... 21 4.2 Stress and strain... 21 4.3 Deformation and crack... 23 4.4 Temperature and humidity... 26 4.5 Vibration... 28 4.6 Earthquake and seismic response... 29 4.7 Wind and wind-induced response... 30 4.8 Other items... 32 4.9 Patrol inspection and system maintenance... 34 5 High-rise building and structure... 34 5.1 General requirements... 34 5.2 Construction monitoring... 37 5.3 Post construction monitoring... 39 6 Long-span spatial structure... 42 6.1 General requirements... 42 6.2 Construction monitoring... 44 6.3 Post construction monitoring... 46 7 Bridge structure... 47 7.1 General requirements... 47 7.2 Construction monitoring... 49 7.3 Post construction monitoring... 51 8 Other structures... 55 8.1 Seismically isolated structure... 55 8.2 Crossing construction... 56 Appendix A Technical requirement of monitoring equipment... 58 Appendix B Monitoring requirement of different types of bridges... 60 Explanation of wording in this code... 63 List of quoted standards... 641 General provisions1.0.1 In order to standardize the building and bridge structure monitoring technology and the corresponding analysis and early warning, to achieve advanced technology, reliable data and reasonable economy, this code is hereby formulated. 1.0.2 This code is applicable to the monitoring of engineering structures such as high-rise buildings and structures, long-span spaces, bridges and seismic isolation structures, as well as the monitoring of existing structures affected by the crossing construction. 1.0.3 Construction and bridge structure monitoring shall, in addition to complying with the provisions of this code, also comply with the relevant requirements of the current notational standards.2 Terms and symbols2.1 Terms 2.1.1 Structural monitoring Frequent, continuous observation or measurement of the state of the structure. 2.1.2 Construction monitoring Structural construction monitoring. 2.1.3 Post construction monitoring Structural post construction monitoring. 2.1.4 Monitoring system It is integrated by the software and hardware for the purposes of achieving a certain monitoring function, composed of the monitoring equipment. 2.2 Symbols fn - n order natural frequency; l - Length or span; n - Number of orders of vibration mode; P - Thrust; r - Conductor resistance; T - Cable force; δ - Relative deformation; ε - Strain; ρ - Unit length of mass.3 Basic requirements3.1 General requirements 3.1.1 Building and bridge structure monitoring shall be divided into construction monitoring and post construction monitoring. 3.1.3 During the monitoring, it shall make patrol inspection and system maintenance. 3.3 Construction monitoring 3.3.3 Construction monitoring item may include strain monitoring, deformation and fracture monitoring, environment and effect monitoring. Deformation monitoring may include foundation settlement monitoring, vertical deformation monitoring and horizontal deformation monitoring; AND environment and effects monitoring may include wind and wind-induced response monitoring, temperature and humidity monitoring, and vibration monitoring.4 Monitoring methods4.1 General requirements 4.1.1 It is preferable for the monitoring items to include the strain monitoring, deformation and fracture monitoring, temperature and humidity monitoring, vibration monitoring, seismic and seismic response monitoring, wind and wind-induced response monitoring, cable force monitoring, and corrosion monitoring. 4.2 Stress and strain 4.2.1 Strain monitoring may be achieved by resistance strain gauges, vibrating wire strain gauges, fiber strain gauges and other strain monitoring components. 4.2.2 It is preferable to select the strain gauges based on monitoring purposes and engineering requirements, as well as sensor technology and environmental characteristics. 4.3 Deformation and crack 4.3.1 Deformation monitoring can be divided into horizontal displacement monitoring, vertical displacement monitoring, three-dimensional displacement monitoring, and other displacement monitoring. 4.4 Temperature and humidity 4.4.1 Temperature and humidity monitoring may include the environment and component temperature monitoring AND environmental humidity monitoring. 4.4.2 Mass concrete temperature monitoring shall be in accordance with the relevant provisions of the current national standard “Code for construction of mass concrete” GB 50496. 4.5 Vibration 4.5.1 Vibration monitoring shall include vibration response monitoring and vibration excitation monitoring. The monitoring parameters may be acceleration, velocity, displacement and strain. 4.5.2 Vibration monitoring methods can be divided into relative measurement and absolute measurement. 4.5.3 The structure vibration displacement monitoring by the relative measurement method shall comply with the following requirements. 4.8 Other items I. Cable force monitoring5 High-rise building and structure5.1 General requirements 5.1.1 In addition to the requirements of the design documents, high-rise buildings and structures at the height of 250 m and above OR having vertical structural components significant in compression and deformation shall be subjected to the construction monitoring, AND the high-rise building and structures having a height of 350 m and above shall be subjected to post construction monitoring. 5.1.4 The foundation pit work having an excavation depth greater than or equal to 5 m OR excavation depth of less than 5 m but the site geological conditions and the surrounding environment more complex as well as other foundation pit works which requires monitoring shall be subjected to monitoring in accordance with Technical code for monitoring of building excavation engineering GB 50497. 5.1.5 The construction monitoring items of the high-rise building and structures shall be selected in accordance with the characteristics of the project from Table 5.1.5. 5.2 Construction monitoring I. Sedimentation monitoring 5.2.1 During settlement monitoring, it shall first transfer the base point of work AND then arrange the settlement measurement points based on regions, AND it is preferable for the settlement monitoring points to be consistent with the horizontal displacement monitoring point. 5.2.2 Deformation monitoring during construction period may include axis monitoring, elevation monitoring, relative deformation monitoring of connected components between building bodies, and monitoring of three-dimensional spatial deformation of key points of the structure. 5.3 Post construction monitoring I. Deformation monitoring 5.3.1 Deformation monitoring measurement point can be at the following locations. 5.3.14 It is preferable for the translating vibration monitoring measurement points to be arranged in the stiffness center of the building. 5.3.15 It is preferable for the torsional vibration monitoring measurement points to be arranged at the edge of the structure of the maximum rotation point. 5.3.16 As for the high-rise building and structures which had been subjected to the vibration bench model test, it may distribute the measurement points in accordance with the vibration bench model test results.6 Long-span spatial structure6.1 General requirements 6.1.1 In addition to the long-span spatial structure which shall be subjected to construction monitoring in accordance with the requirements of the design documents or other provisions, the long-span spatial structure shall be subjected to the construction monitoring once complying with one of the following conditions. 6.1.2 Ultra-high, overweight and long-span formwork support systems with height over 8 m or span over 18 m, total construction load over 10 kN/m2 and concentrated load over 15 kN/m shall be monitored. 6.1.3 In addition to the long-span spatial structure which shall be subjected to post construction monitoring in accordance with the requirements of the design documents or other provisions, the long-span spatial structure shall be subjected to the post construction monitoring once complying with one of the following conditions. 6.2.2 Deformation monitoring during construction may include deflection of members, offset of center axis of support, height difference of highest and lowest supports, height difference of adjacent supports, axis of rod, perpendicularity of member, and sloping deformation monitoring. 6.2.3 After finishing the spatial structure installation, when monitoring the main span deflection, the measurement points may be determined by the design unit. When there is no design requirement, it shall monitor the mid-span deflection for the span of 24 m and below; AND it shall monitor the deflection at the mid-span and quarter-point along span direction for the span more than 24 m. 6.3 Post construction monitoring I. Deformation monitoring 6.3.1 Measurement point arrangement for deformation monitoring during construction shall be selected in accordance with Table 6.3.1. 6.3.2 During use, it is preferable to make strain monitoring for the key support and the main stressed components; AND it is preferable to make strain monitoring for the root or high stressed parts of the ultra-large overhang cantilever structure. 6.3.3 During the use of cable structure, it shall regularly monitor the cable force; AND when the difference between the cable force and the design value is more than 10%, it shall make warning in time AND adjust or compensate the cable force. 6.3.4 When the main membrane surface of the membrane structure is subjected to wind and wind-induced response monitoring, it is preferable to divide the monitored area into wind pressure and wind vibration main monitoring area and the wind pressure secondary monitoring area, AND the monitoring items are membrane surface vibration and wind pressure on the upper and lower surfaces.7 Bridge structure7.1 General requirements 7.1.1 In addition to the bridge structures which shall be subjected to construction monitoring in accordance with the requirements of the design documents or other provisions, the bridge structures shall also be subjected to the construction monitoring once complying with one of the following conditions. 7.1.2 For particularly important ultra-large bridges, it shall make post construction monitoring. 7.1.3 In addition to the bridge structures which shall be subjected to post construction monitoring in accordance with the provisions of clause 7.1.2 of this code, the requirements of the design documents or other provisions, the bridge structures shall also be subjected to the post construction monitoring once complying with one of the following conditions. 7.3.3 The post construction deformation monitoring frequency shall be determined in combination with the bridge structure characteristics and service life, which shall be not less than the regular inspection frequency; AND it is preferable to make monitoring for the ultra-large bridge. 7.3.4 Strain monitoring measurement points shall be arranged in accordance with the stressing characteristics of the bridge structure. 7.3.5 Strain monitoring shall be set with the warning value in accordance with the strain amplitude of the structure during use. 7.3.6 The cable force monitoring of the suspension boom or sling, stay cable or main cable shall comply with the following requirements. 7.3.7 Steel structure bridges shall be subject to fatigue monitoring; AND the monitoring parameters may include fatigue stress and steel structure temperature. 7.3.8 Dynamic response monitoring shall take into account the dynamic characteristic test, AND the monitoring project may include the structure natural frequency, vibration mode and damping ratio.8 Other structures8.1 Seismically isolated structure 8.1.1 In addition to the seismically isolated structure which shall be subjected to monitoring in accordance with the requirements of the design documents or other provisions, the seismically isolated structure shall be subjected to the construction and post construction monitoring once complying with one of the following conditions. 8.1.2 The measurement points of the seismically isolated layer shall be set at the key parts of the seismically isolated layer. During construction, it shall monitor the horizontal and vertical displacement of the seismically isolated layer; AND during use, it shall also monitor the acceleration of the seismically isolated layer and the structure top layer. 8.2 Crossing construction 8.2.1 underground works through the existing structure of regular wear and side wear, the following conditions shall be carried out through the construction monitoring. 8.2.4 All the important structures to be crossed shall be monitored in real time during construction. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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