Transcription of NCMA TEK
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NCMA TEK
Sized to provide sufficient design strength. Further informa-tion on determining design loads for lintels is included inAllowable Stress Design of Concrete masonry Lintels, TEK17-1A (ref. 3).Nominal lintel strength is determined based on thestrength design provisions of ACI 318 and then reduced bystrength reduction factors, called phi ( ) factors. Thesefactors account for any variability in materials and construc-tion practices. The resulting capacity needs to equal or exceedthe factored loads. Precast concrete strength reduction factorsare and for flexure and shear, respectively (ref. 2).Tables 1 through 4 list design moment and shear strengthsfor various precast lintel sizes and concrete strengths, basedon the following criteria (ref. 2).Flexural strength: Mn= [As fy(d-a/2)], = strength, no shear reinforcement: Vn= (2) (f 'c)1/2 bd, = 318 contains requirements for minimum and maxi-mum reinforcing steel areas to ensure a minimum level ofperformance.
Deflection criteria for lintels is based on controlling crack-ing in the masonry being supported. Consequently, less deflec-tion is allowed when the lintel supports unreinforced masonry.
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