Basic structure and method of building structure detection and seismic identification
(House structure seismic identification contact telephone number)
When the construction is stopped during construction or when the construction needs to be layered, sandwiched, expanded, or a large-scale structural system or function is changed, the original structure needs to be subjected to seismic identification, including the detection of the original structure. The original structural system and structure are identified, the structural seismic proofing is carried out according to the reconstructed structure, the seismic performance of the structural structure after reconstruction and the feasibility of the reconstruction plan are comprehensively evaluated, and if necessary, the optimization measures of the reconstruction plan and the seismic strengthening measures of the original structure are proposed. Earthquake identification of building alterations is generally based on current seismic design standards.
1, testing items
By testing the quality status of the house and assessing the safety of the house under the earthquake of the specified intensity according to the specified seismic fortification requirements.
2, the scope of application
Non-seismic fortification or fortifications are lower than the current regulations, especially for the protection of buildings, urban lifeline projects and renovation of additional works.
3. Testing content and process
1) The main test parameters are:
Tilting, settlement, cracks, foundation foundation, masonry structural members, wood structural members, concrete structural members, steel structural members, etc., the detection of each parameter is generally on-site inspection.
2) Off-site testing items are:
a. In the inspection of concrete structural members, the concrete core method is used to detect the concrete strength;
b. In the detection of steel structural members, the tensile strength test method of steel is used to test the tensile strength of steel specimens, and the bending strength test method of steel is used to test the bending deformation ability of steel specimens.
c. In the detection of wood structural members, the wood is subjected to compressive, tensile and shear strength tests, wood flexural strength and elastic modulus tests, and wood transverse compressive strength tests.
3) Testing process:
1. Collect the original information such as the geological survey report, the completion drawing and the project acceptance document of the house, and supplement the engineering geological survey if necessary.
2. Comprehensively inspect and record the damage location, extent and extent of the foundation, load-bearing structure and envelope structure.
3. Investigate and analyze the seismic characteristics of the structure, structural arrangement and structure of the building structure, and review the seismic bearing capacity.
4. The test items for the mechanical properties of the building structural materials shall be determined according to the needs of the structural bearing capacity.
5, the general housing should be in accordance with the "Building Seismic Identification Standard" GB50023-95, using the corresponding step-by-level identification method for comprehensive seismic capacity analysis.
The seismic identification method is divided into two levels. The first-level appraisal is based on macro-control and tectonic appraisal for comprehensive evaluation, and the second-level appraisal is based on seismic quantification, and comprehensive evaluation of house seismic capacity is carried out in combination with structural influence.
When the house meets the requirements of the first-class seismic appraisal, the house can be rated as meeting the seismic appraisal requirements, and no second-level appraisal is required; otherwise, the second-level seismic appraisal should be judged.
6. To assess the overall seismic capacity of existing houses, and propose necessary seismic strengthening measures and countermeasures for earthquake and disaster mitigation according to relevant technical standards for houses that do not meet seismic requirements.
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