2 Terms,Symbols 2.1 Terms 2.1.1 Concrete structures-The structures are mainly made by concrete,including plain concrete stucture,reinforced concrete structure,and prestressed concrete structure etc. 2.1.2 Plain concrete structure-The structure is made of the concrete without the stcel reinforcements or not providing with the stressed steel reinforcements. 2.1.3 Reinfored concrete structure-The structure is made of the and providing with the stressed ordinary steel reinforcements,steel reinforcement meshs or steel reinforcement skeletons. 2.1.4 Prestressed concrete structure-The structure is made of the concrete and providing with the stressed prestressing reinforcements,which will be through stretching or by other methods to establish prestress. 2.1.5 Pre-tensioned prestressed structure-The concrete structure of which the concrete will be casted,after the stressed prestressing reinforcements have been stretched on stretching bed,then thu the transmission of ond force between tendons and conrete to establish prestress 2.1.6 Post-tensioned prestressed concrete structure-The concrete structure of which the strength of concrete should be first reached the required stipulated requirements,then stretching the stressed pre- stressing reinforcements and anchoring on the structure to establish prestress. 2.1.7 Cast-in-itcontetre-Thecor of hi the fomork stalled in-situ and cast-in-situ the concrete integrally. 2.1.8 Prefabricated concrete sructur-The concretesucture of which the structure is assembled by 2.1.9 Assembled monolithic concrete structure-The monolithic concrete structure is assembled by precasted concrete components or parts,through the connections of steel reinforcements,connecting parts or applied prestressing force,and finally cast-in-situ the concrete. 2.1.10 Frame structure-The load-bearing system structure is compeed by girders and columns con- necting them with rigid joint or hinged jo. 2.1.11 Suructural (shear)wall structure-The structure is composed by structural wall (shear wall)to sustain the vertical and horizontal actions. 2.1.12 Frame-structural (shear)wall structure-The structure of which the vertical and horizontal ac- tions are jointly sustained by frame and structural wall (shear wall). 2.1.13 Deep flexural member-It denotes the flexural member with span-depth ratio less than 5. 2.1.14 Deep beam-denotes the single-span beam with span-depth ratio not greater than 2 and the multi-spn beam with span-depth ratio not greater than 2.5. 2.1.15 Ordinary steel bar-A general call for various non-prestressed steel reinforcements which are used in concrete structural members