1 General Principles 1.0.1 The code was drawn up to suit the needs for design of building structures,and to confom with the requirements for the safety,serviceability and the economy,rationality of building structures. 1.0.2 The code is applicable to the structural design of building engineering. 1.0.3 The code was drawn up in accordance with the principles stipulated in the"Unified Standard for Reliability Design of Building Structures"(GB 50068-2001). 1.0.4 Actions,which are dealt with the design of building structures,include direct actions (loads) and indirect actions (such as the actions may be caused by deformation of subsoil,shrinkage of con- crete,distortion due to welding,variation of temperature,earthquake and ete.).Only the stipulations of concered loads were dealt with the code. 1.0.5 A 50-year design reference period was adopted by the code. 1.0.6 Actions or loads,which are dealt with the design of building structures,besides they shall be implemented in accordance with the code,the stipulations of other current national standards shall still be conformed