1.0.1 This code was formulated with a view to unifying the technical requirements of the design of steel structures in port and waterway engineering and achieving the safety and reliability, economy and rationality, advanced technology and guaranteed quality.
1.0.2 This code is applicable to the design of hydraulic steel structures in port and waterway engineering, therein, the design of lock gate and valve as well as dock gate not only shall conform to the relevant requirements of this code, but also shall conform to the requirements of the current professional standards "Code for Design of Lock Gates and Valves of Shiplocks" (JTJ 308) and "Code for Design of Dock Gates and Filling and Emptying Systems of Dry Docks" (JTJ 253) respectively.
1.0.3 The design of steel structures in port and waterway engineering shall not only comply with the requirements of this code, but also comply with those in the current relevant ones of the Nation.
2 Terms
2.0.1 Slip coefficients
The ratio of external force making the friction surface of connecting piece slip to the pretension force of high-strength bolt perpendicular to the friction surface in the connecting of high-strength bolts.
2.0.2 Number of stress cycles
The number of stress variation generated by the repeating action of dynamic loads within the designed lifetime.
2.0.3 Brittle fracture
Emergent fracture of steel structure without warning marks for plastic deformation under the state of tensile stress.
2.0.4 Prying force
The increased tensile force in bolts caused by lever action due to the deformation of connection piece in the tension joint of bolts.
2.0.5 Buckling
The member bar or plate bursts with relatively large deformation inconsistent with the former stress state, under the action of axial compression, bending moment and shear force separately or jointly.
2.0.6 Composite steel and concrete beam
The beam composited by concrete flange plate and steel beam via shear connection pieces and able to bear force as a whole.
3 Basic Requirements
3.1 General Requirements
3.1.1 Design of steel structures in port and waterway engineering shall meet the requirements of strength, stability and rigidity and the requirements of anti-corrosion, manufacture, transportation and installation.
3.1.2 The design document of steel structure shall state such guarantee items as the designed lifetime of structure, the adopted grade of steels, the model or steel grade of connecting material and the required mechanical property and chemical composition, simultaneously, shall state the weld form, weld quality grade, planed tightly topped positions of end surface and the requirements for construction.
3.1.3 The monographic studies on aspects of necessary design calculation and construction shall be carried out for the design of a new type or the large steel structure engineering.
3.1.4 Except the fatigue calculation and the calculation of lock gate and valve as well as dock gate in this code, all the others shall adopt the ultimate state design method on the basis of probability theory and shall be calculated by using the design expression of partial coefficient.
3.1.5 The design of steel structures shall adopt different safety classes and corresponding structure importance coefficients, reference to the requirements of current national standard "Unified Standard of Reliability of Structural Design for Harbour Engineering" (GB 50158) and according to the probable consequence of structural failure.
3.1.6 The bearing structure shall be designed according to the limit state of bearing capacity and the serviceability limit state, and shall meet the following requirements:
(1) Limit state of bearing capacity includes: strength failure and fatigue failure of member and connection; unsuitable for continue bearing due to excessive deformation; structure, member or plate loses stability; structure transforming to maneuverable system and structure overturning as well as the progressive collapse of structure due to local failure; the calculation of limit state of bearing capacity includes the checking of strength, overall stability and local stability;
(2) Normal serviceability limit state includes: the deformation affecting the normal use or appearance of structure, member and nonstructural members; the vibration affecting normal use and the local damage affecting normal use or durability; the calculation of serviceability limit state includes the calculation of deformation or deflection and the checking of slenderness ratio.
3.1.7 As for the design of steel structures, the four design situations below shall be distinguished:
(1) Persistent design situation, which is applicable to the normal condition for structure application;
(2) Transient design situation, which is applicable to the temporary conditions for structure, including structure construction and maintenance conditions, etc.;
(3) Occasional design situation, which is applicable to the abnormal conditions for special requirement, including the conditions that the structure suffers from a fire, an explosion or an impact;
1 General Provisions 2 Terms 3 Basic Requirements 3.1 General Requirements 3.2 Materials 3.3 Deformation 3.4 Protection 4 Member Calculation 4.1 General Requirements 4.2 Calculated Length and Allowable Slenderness Ratio 4.3 Strength and Stability 4.4 Deformation 5 Connection Calculation 5.1 General Requirements 5.2 Weld Connection 5.3 Bolt and Rivet Connection 5.4 Gusset Plate 5.5 Support 6 Fatigue Calculation 7 Construction Requirements 7.1 General Requirements 7.2 Weld Connection 7.3 Bolt Connection and Rivet Connection 7.4 Structural Members 8 Steel Approach Bridge 8.1 General Requirements 8.2 Bridge Decking 8.3 Bracing 8.4 Solid-web Beam-type Main Beam 8.5 Truss-type Main Beam 8.6 Open Spandrel Arch Truss-type Main Beam 9 Box Track Beam 10 Steel Pipe Pile 11 Steel Sheet Pile 12 Steel Strut 13 Composite Steel and Concrete Beam 13.1 General Requirements 13.2 Calculation 13.3 Construction Requirements 14 Lock Gates and Valves 15 Dock Gate Appendix A Section Classification of Axial Compression Members Appendix B Stability Coefficient of Axial Compression Members Appendix C Equivalent Slenderness Ratio of Axial Compression Members C.1 Equivalent Slenderness Ratio of Monosymmetric Section C.2 Equivalent Slenderness Ratio of Lattice Type Axis Compression Members Appendix D Overall Stability Coefficient of Beam D.1 Constant-section Welded I-shaped and Rolled H Steel Simply Supported Beams D.2 Rolled Ordinary I-Steel Simply Supported Beam D.3 Rolled U-steel Simply Supported Beam D.4 Bi-axial Symmetrical I-shaped Constant-section and H Steel Cantilever Beams D.5 Approximate Calculation of the Overall Stability Coefficient of Flexural Member Appendix E Member and Connection Classification in Fatigue Calculation Appendix F Checking for the Lateral Stability of Compression Chord or Flange of Opening Through Steel Approach Bridge Appendix G Explanation of Wording in This Code Additional Explanation Name List of Chief Development Organizations, Participating Development Organizations, Chief Drafting Staff, Chief Examiners And Management Group Staff of This Code
