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## Materials Library |

This is the button in the Tab bar to open the library of the materials data (the same selecting "Materials Library" from the drop-down RUN menu). In this window all tension are expressed in Mpa (N/mm²).

At starting of the program or of a new calculation this window show the default library which may be amended or extended. To save the library as default library for the next calculations save it with the command "Set as default". To save the current library (after modifications) only for current section save it with the command "Set for current calc." (this current library is saved together with the data of the section.

Class: Name of the strength class of the concrete by means a string of no more than 10 alphanumeric characters. The normalized classes to edit are those present in the table 3.1 EC2 on the basis of the characteristic cylindrical strength fck and cubic Rck.

Values based on fck: if this box is checked Ecm, fcm, fcd, fctd, fctm (column with dark background colour) are automatically calculated by program typing the only fck value. Their values are defined on the basis of formulas in table 3.1 EC2, of partial safety factor γc in table 2.1N EC2 and of code setting adopted by user (National Annexes) in the window dialog "Code and reinforcement options". If the box is not checked you can freely change all the above values.

Ecm: Mean elastic Ecm modulus (Mpa). In table 3.1 EC2 Ecm = 22000 [(fcm/100]0.3 Mpa

fcm: Mean compressive cylindrical strength fcm = fck + 8

fck: Characteristic compressive cylindrical strength fck

fcd: Design compressive strength fcd = acc fck / γc with γc= 1.5 and acc = coefficient taking account of long term effects defined in the window Code options (recommended value 1.0)

fctd: Design tensile strength fctd = 0,7 fctm / γc

fctm: Design mean tensile strength fctm = 0.3 (fck)2/3 if fck ≤ 50 Mpa; fctm = 2.12 ln[1+ (fcm/10)] if fck > 50 Mpa

Creep coeff.: Coefficient φ(t,t0) [eq.(B.1) in B.1 Annex B EC2] used in SLS stress determinations based on AAEM and EM method and in SLS deflections calculation. Default value are to be changed in base to the real case study.

Shrinkage coeff.: Coefficient ecs [eq. (3.8) EC2]. Same considerations in above creep coeff.

Aging coeff.: Coefficient χ(t,t0) used in SLS stress determinations based on AAEM method and in SLS deflections calculation. For t=∞ use χ=0.8. In EM method χ=1.0

n omog.: Es/Ec used in SLS stress simplified calculation (n = 15 as common default value).

fc max: max strength of confined concrete in a stress-strain relation Kent-Park type (for ductility check with moment-curvature diagrams)

fc ult: strength of confined concrete at max compressive confined strain in a stress-strain relation Kent-Park type (for ductility check with moment-curvature diagrams)

ec 0: compressive strain ec0 at max confined stress in a stress-strain relation Kent-Park type (for ductility check with moment-curvature diagrams)

ec ult: compressive strain ecu in correspondence of fc ult in a stress-strain relation Kent-Park type (for ductility check with moment-curvature diagrams)

Name: Name of steel grade (string of no more than 10 alphanumeric characters)

Es: Elastic modulus Es. (Es= 200000 is the recommended value in EC2)

fym: Mean yielding stress fym (no indication in EC2). Used in ductility check

fyk: Characteristic (nominal) yielding stress fyk

fyd: Design yielding stress fyd = fyk / γs with γs= 1.16; this value is not editable as derived automatically from the value assigned to fyk

ftk: Characteristic nominal tensile strength ftk. This value is never used in program calculation (but only for description). The ratio ftk/fty is regulated for each class (A-B-C) of steel in Annex C EC2.

ftk/fyk:This ratio ftk/fty , important for steel ductility, is regulated for each class of steel in Annex C EC2. This value is never used in program calculation (but only for description)

e_uk: Characteristic strain at max force euk (for A class steel ≥ 0.025; for B class steel ≥ 0.025 ; for C class steel ≥ 0.075). It is important to edit this value in accordance with the steel grade

e_ud: Design ultimate strain eud = euk * ku with ku= reduction factor assigned in Code and reinforcement options (0.9 if the recommended for ku value in EC2). This value is not editable as derived automatically from the values assigned to e_uk and ku

k: Design ratio ftd/fyd ; if you set k=1 program assume in the design stress-strain diagram an horizontal top branch without strain limit (with a very little difference in results program assumes eud as strain limit); if you set 1<k≤1.35 program assume in design stress-strain diagram (see fig. 3.8 EC2) an inclined branch with strain limit eud and max stress k·fyd . Assigned k value must be consistent with nominal ratio ftk/fty