GB 55005-2021Code for design of timber structures (English PDF)

1 General

1.0.1 This specification is hereby formulated, in order to ensure the quality and safety of timber structure projects, implement resource conservation and environmental protection policies, ensure the safety of people's lives and property and personal health, improve the sustainable development level of timber structure projects.

1.0.2 Timber structure engineering must implement this specification.

1.0.3 Whether the technical methods and measures, which are adopted in the project construction, meet the requirements of this specification, shall be determined by the relevant responsible entities. Among them, innovative technical methods and measures shall be demonstrated, to meet the relevant performance requirements in this specification.

2 Basic provisions

2.0.1 The safety level of timber structure and its components shall not be less than level 3.When the safety levels of structural members and components are inconsistent with that of the structures, they shall be clearly marked in the design documents.

2.0.2 The design service life of timber structure shall meet the following requirements.

3 Materials

3.0.1 The timber structure shall adopt square timber, logs, sawn timber, engineered timber products, which have clear material grade or strength grade.

3.0.2 The moisture content of structural timber shall meet the requirements for design, production, installation of timber structure.

3.0.5 The steel used in the timber structure shall meet the following requirements.

3.0.6 In addition to meeting the requirements of Article 3.0.5 of this specification, the metal connectors, which are used in the timber structure, shall also provide a product quality certificate. The cast steel connectors shall also have a qualified guarantee for the reduction of cross-sectional area. Stainless steel connectors shall also have the qualified guarantee of nominal yield strength, tensile strength, elongation, content of carbon, nickel, chromium, molybdenum.

4 Design

5 Protection and fire protection

6 Construction and acceptance

6.0.1 In the engineering construction of timber structures, it shall take safety measures to ensure the bearing capacity and stability of the structure, during the construction process, as well as measures to ensure the safety of construction equipment and facilities; meanwhile, it shall carry out necessary verification.

6.0.4 The construction quality control of timber structure engineering shall meet the following requirements.

6.0.5 When other materials and components are used to replace the materials and components, which are specified in the design documents, for the construction of timber structures, it shall ensure the reliability of the structure.

6.0.6 The inspection of incoming timber and timber products shall include the following items.

7 Maintenance and removal

7.0.1 Within the design service life of the timber structure buildings, it shall establish an inspection and maintenance system, for waterproof, moisture- proof and anti-biological hazard measures, according to the local climate conditions, the degree of termite hazards, the characteristics of the building.

7.0.3 When the structural safety is affected by the renovation of timber structures, it shall test and assess the structure; take effective treatment measures, according to the appraisal results.

7.0.4 The timber structure shall be demolished under the following conditions.

7.0.5 For the demolition of timber structures, it shall carry out site assessment;

formulate a special demolition plan. Meanwhile, there shall be measures for safety protection, control of dust, construction materials, garbage classification and disposal.

7.0.6 Before the timber structure is dismantled, it shall make written safety technical disclosure, for the construction workers.

7.0.7 When manual or mechanical dismantling is used, the dismantling shall be carried out floor by floor from top to bottom, in segments. It shall first remove the non-load-bearing structure, then the load-bearing structure.

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