By W. M. C. McKenzie
"Design of Structural Masonry" offers a accomplished resource of knowledge on sensible masonry layout, introduces the character and inherent features of masonry given relating to the necessities of BS 5628 and introduces using Eurocode EC6 in structural masonry layout. The book's content material levels from an creation to masonry as a fabric to the layout of real looking constructions.
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In the design process the characteristic loads are multiplied by the partial safety factors to obtain the design values of design effects such as axial or flexural stress, and the design strengths are obtained by dividing the characteristic strengths by appropriate partial safety factors for materials. g. fk γm ≥ Design load effects ≥ [(stress due to Gk × γf dead ) + (stress due to Qk × γf imposed )] where: fk is the characteristic compressive strength of masonry, γm is the partial safety factor for materials (masonry), Gk is the characteristic dead load, Qk is the characteristic imposed load, γf dead partial safety factor for dead loads, γf imposed is the partial safety factor for imposed loads.
9 fk kN/mm2. 0 fk, the value given, however, is sufficiently accurate for design purposes. ) and lightweight concrete masonry as indicated in Appendix C of Part 2 of the code. In service masonry stresses are normally very low when compared with the ultimate value and consequently the use of linear elastic analysis techniques to determine structural deformations is acceptable. 6. 7 Creep, Moisture Movement and Thermal Expansion The effects of creep, shrinkage, moisture and thermal movement are all significant particularly when considering the design of prestressed masonry.
5 Slenderness (hef /tef) (Clause 28) The slenderness of a structural element is a mathematical concept used to assess the tendency of that element to fail by buckling when subjected to compressive forces. In many cases this is defined as a ratio of effective buckling length (le) to radius of gyration (r) about the axis of buckling. The effective buckling length is related to the type and degree of end fixity of the element and the radius of gyration is related to the crosssectional geometry. In rectangular cross-sections such as frequently encountered in masonry and timber design, the actual thickness is equal to the radius of gyration multiplied by 12 ; consider a rectangular element of width ‘d’ and thickness ‘t’: y y d t ryy = t = I yy Area 12 ryy = dt 3 1 × 12 dt ∴ t = t 12 ∝ ryy Since ‘t’ is directly proportional to ‘r’ then slenderness can equally well be expressed in terms of thickness instead of radius of gyration.