【正文】
oncrete structures are built in seismic regions. (4)P Eurocode 2 is subdivided into the following parts: Part : General rules and rules for buildings Part : Structural fire design Part 2: Reinforced and prestressed concrete bridges Part 3: Liquid retaining and containing structures Scope of Part 11 of Eurocode 2 (1)P Part 11 of Eurocode 2 gives a general basis for the design of structures in plain, reinforced and prestressed concrete made with normal and light weight aggregates together with specific rules for buildings. (2)P The following subjects are dealt with in Part 11. Section 1: General Section 2: Basis of design Section 3: Materials Section 4: Durability and cover to reinforcement 9 Section 5: Structural analysis Section 6: Ultimate limit states Section 7: Serviceability limit states Section 8: Detailing of reinforcement and prestressing tendons General Section 9: Detailing of members and particular rules Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or working permitted without license from IHS Not for Resale `,`,```,`,`,`,` EN 199211:2020 (E) 15 Section 10: Additional rules for precast concrete elements and structures Section 11: Lightweight aggregate concrete structures Section 12: Plain and lightly reinforced concrete structures (3)P Sections 1 and 2 provide additional clauses to those given in EN 1990 “Basis of structural design”. (4)P This Part 11 does not cover: the use of plain reinforcement resistance to fire。 particular aspects of special types of civil engineering works (such as viaducts, bridges, dams, pressure vessels, offshore platforms or liquidretaining structures)。 Depth d Effective depth of a crosssection Copyright European Committee for Standardization Provided by IHS under license with CEN No reproduction or working permitted without license from IHS Not for Resale `,`,```,`,`,`,` EN 199211:2020 (E) 18 dg Largest nominal maximum aggregate size e Eccentricity fc Compressive strength of concrete fcd Design value of concrete pressive strength fck Characteristic pressive cylinder strength of concrete at 28 days fcm Mean value of concrete cylinder pressive strength fctk Characteristic axial tensile strength of concrete fctm Mean value of axial tensile strength of concrete fp Tensile strength of prestressing steel fpk Characteristic tensile strength of prestressing steel fp0,1 0,1% proofstress of prestressing steel fp0,1k Characteristic 0,1% proofstress of prestressing steel f0,2k Characteristic 0,2% proofstress of reinforcement ft Tensile strength of reinforcement ftk Characteristic tensile strength of reinforcement fy Yield strength of reinforcement fyd Design yield strength of reinforcement fyk Characteristic yield strength of reinforcement fywd Design yield of shear reinforcement h Height h Overall depth of a crosssection i Radius of gyration k Coefficient 。 Span m Mass r Radius 1/r Curvature at a particular section t Thickness t Time being considered t0 The age of concrete at the time of loading u Perimeter of concrete crosssection, having area Ac u,v,w Components of the displacement of a point x Neutral axis depth x,y,z Coordinates z Lever arm of internal forces 14 Greek lower case letters α Angle 。 ratio。s ratio ν Strength reduction factor for concrete cracked in shear ξ Ratio of bond strength of prestressing and reinforcing steel ρ Ovendry density of concrete in kg/m3 ρ 1000 Value of relaxation loss (in %), at 1000 hours after tensioning and at a mean temperature of 20176