{"id":1821,"date":"2017-07-12T13:08:38","date_gmt":"2017-07-12T07:38:38","guid":{"rendered":"https:\/\/www.onlinecivilforum.com\/site\/?p=1821"},"modified":"2022-12-13T11:33:53","modified_gmt":"2022-12-13T06:03:53","slug":"design-of-strap-footing","status":"publish","type":"post","link":"https:\/\/onlinecivilforum.com\/site\/design-of-strap-footing\/","title":{"rendered":"Design of Strap Footing"},"content":{"rendered":"<p><strong>Design of Strap footing<\/strong><\/p>\n<p><strong>Introduction<\/strong><\/p>\n<p>When \u00a0two \u00a0columns are reasonably close, a combined footing is designed for both columns as shown in below. When two columns are far apart, a strap is designed to transfer eccentric moment between two columns as shown in below. The goal is to have uniform bearing pressure and to minimize differential settlement between columns.<\/p>\n<p><img decoding=\"async\" class=\"alignleft size-medium wp-image-1827\" src=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing-300x254.png\" alt=\"\" width=\"300\" height=\"254\" srcset=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing-300x254.png 300w, https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing.png 452w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/> <img decoding=\"async\" class=\"size-medium wp-image-1823 aligncenter\" src=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing1-300x227.png\" alt=\"\" width=\"300\" height=\"227\" srcset=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing1-300x227.png 300w, https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing1-80x60.png 80w, https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing1.png 480w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><strong>Design assumptions<\/strong><\/p>\n<ol>\n<li>Strap does not provide bearing.<\/li>\n<li>Strap is ridge enough to transfer moment from one footing to the other.<\/li>\n<\/ol>\n<p><strong>Design procedure<\/strong><\/p>\n<p><strong>Service load design:<\/strong><\/p>\n<ol>\n<li>Determine the length of exterior footing and its eccentricity, e.<\/li>\n<li>Determine eccentric moment, M = Pa*e.<\/li>\n<li>Determine shear force, V = M \/ L<\/li>\n<li>Determine footing reaction, Ra = Pa+V, and Rb = Pb-V<\/li>\n<li>Determine footing sizes for both A &amp; B.<\/li>\n<\/ol>\n<p><strong>Structural analysis<\/strong><\/p>\n<ol>\n<li>Calculate factored column loads, Pua &amp; Pub<\/li>\n<li>Calculate factored eccentric moment Mu = Pua*e<\/li>\n<li>Calculate factored shear, Vu = Mu \/ L<\/li>\n<li>Determine factored reactions, Rua &amp; Rub.<\/li>\n<li>Perform structural analysis, determine factored shear and moment on footings and strap.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>Reinforced concrete design<\/strong><\/p>\n<ol>\n<li>Design exterior footing. Check shear stresses and design flexural reinforcement.<\/li>\n<li>Design interior footing. Check shear stresses and design flexural reinforcements.<\/li>\n<li>Design footing strap as a reinforced concrete beam.<\/li>\n<\/ol>\n<p><strong>Service load design:<\/strong><\/p>\n<p><strong>Design procedure:<\/strong><\/p>\n<ol>\n<li>Determine the length of exterior footing and its eccentricity, e.<\/li>\n<li>Determine eccentric moment, M = Pa*e.<\/li>\n<li>Determine shear force, V = M \/ L<\/li>\n<li>Determine footing reaction, Ra = Pa+V, and Rb = Pb-V<\/li>\n<li>Determine footing sizes for both A &amp; B.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>Determine sizes of strap footing<\/strong><\/p>\n<p><strong>Given:<\/strong><\/p>\n<p><strong>Column information:<\/strong><\/p>\n<p>Column A: Live load = 40 kips, Dead load = 50 kips<\/p>\n<p>Column B: Live load = 80 kips, Dead load = 100 kips.<\/p>\n<p>Distance between two columns: 22 ft.<\/p>\n<p><strong>Footing information:<\/strong><\/p>\n<p>Allowable soil bearing capacity; 3000 psf<\/p>\n<p>Distance from column A to edge of footing: 1 ft.<\/p>\n<p>Allowable soil bearing capacity = 3000 psf<\/p>\n<p>Weight of soil above footing = 120 psf<\/p>\n<p>Depth of footing= 24\u201d<\/p>\n<p>Depth of soil above footing = 12\u201d<\/p>\n<p>Requirements: Determine the size of footing A &amp; B.<\/p>\n<p><strong>Solution:<\/strong><\/p>\n<p><img decoding=\"async\" class=\"size-medium wp-image-1824 aligncenter\" src=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing2-300x172.png\" alt=\"\" width=\"300\" height=\"172\" srcset=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing2-300x172.png 300w, https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing2.png 477w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>Assume a footing width of 6 ft, the eccentricity of footing A is e = 6\/2-1=2\u2019.<\/p>\n<p>The distance between footing reaction, L = 22-2=20\u2019<\/p>\n<p>The eccentric moment is M = (40+50)*2=180 ft-kips<\/p>\n<p>The shear produced by M is, V = 180\/20=9 kips<\/p>\n<p>Reaction at footing A = 40+50+9 =99 kips<\/p>\n<p>Net soil bearing capacity = 3000-2*150-120=2580 psf<\/p>\n<p>Required footing area of A = 99\/2.58=38.4 ft2.<\/p>\n<p>Use 6\u2019 by 6.5\u2019 footing, area = 39 ft2.<\/p>\n<p>Reaction at footing B = 100+80-9=171 kips<\/p>\n<p>Required footing area = 171\/2.58=66.3 ft2.<\/p>\n<p>Use 8\u2019 by 8.5\u2019 footing, A = 68 ft2.<\/p>\n<p><img decoding=\"async\" class=\"size-medium wp-image-1823 aligncenter\" src=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing1-300x227.png\" alt=\"\" width=\"300\" height=\"227\" srcset=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing1-300x227.png 300w, https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing1-80x60.png 80w, https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing1.png 480w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><strong>Structural analysis of strap footing<\/strong><\/p>\n<p><strong>Procedures<\/strong><\/p>\n<ol>\n<li>Calculate factored column loads, Pua &amp; Pub<\/li>\n<li>Calculate factored eccentric moment Mu = Pua*e<\/li>\n<li>Calculate factored shear, Vu = Mu \/ L<\/li>\n<li>Determine factored reactions, Rua &amp; Rub.<\/li>\n<li>Determine factored footing reactions.<\/li>\n<li>Perform structural analysis; determine factored shear and moment<\/li>\n<\/ol>\n<p>on footings and strap.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Determine moment and shear in a strap footing<\/strong><\/p>\n<p>Given: The strap footing in<\/p>\n<p>Requirement: Determine maximum factored shears and moment in the footings and strap.<\/p>\n<p><strong>Solution:<\/strong><\/p>\n<p>Factored column load of A = 1.4*50+1.7*40=138 kips<\/p>\n<p>Factored column load of B = 1.4*100+1.7*80=276 kips<\/p>\n<p>Factored eccentric moment, Mu = 138*2=276 ft-kips<\/p>\n<p>Factored shear, Vu = 276\/20=13.8 kips<\/p>\n<p>Factored footing reaction at A = 138+13.8=151.8 kips<\/p>\n<p>Factored footing pressure per linear foot of A = 151.8\/6=25.3 k\/ft<\/p>\n<p>&nbsp;<\/p>\n<p>Factored footing reaction at B = 276-13.8=262.2 kips<\/p>\n<p>Factored footing pressure per linear foot at B = 262.2\/8=32.8 k\/ft.<\/p>\n<p><strong>Shear diagram:<\/strong><\/p>\n<p>At point 1: Vu = 25.3*1.5-138= -100.1 kips<\/p>\n<p>At point 2: Vu = 25.3*6-138=13.8 kips<\/p>\n<p>At point 3: Vu = 25.3*6-138=13.8 kips<\/p>\n<p>At point 4: Vu = 13.8+32.8*3.5= 128.6 kips<\/p>\n<p>At point 5: Vu = 32.8*-3.5=-114.8 kips<\/p>\n<p><strong>Moment diagram:<\/strong><\/p>\n<p>At point 1: Mu = 25.3*1.52\/2-138*0.5= -40.5 ft-kips<\/p>\n<p>At point 2: Mu = 25.3*62\/2-138*5= -234.6 ft-kips<\/p>\n<p>At point 3: Mu = 25.3*6*(6\/2+13)-138*(5+13)=-55.2 ft-kips<\/p>\n<p>At point 4: Mu = 25.3*6*(6\/2+13+3.5)-138*(5+13+3.5)+32.8*3.52\/2=194 ft-kips<\/p>\n<p>At point 5: Mu = 32.8*3.52\/2=200.9 ft-kips<\/p>\n<p><img decoding=\"async\" class=\"size-medium wp-image-1826 aligncenter\" src=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing4-300x260.png\" alt=\"\" width=\"300\" height=\"260\" srcset=\"https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing4-300x260.png 300w, https:\/\/onlinecivilforum.com\/site\/wp-content\/uploads\/2017\/07\/Design-of-Strap-footing4.png 515w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><strong>Reinforced concrete design of strap footing<\/strong><\/p>\n<p><strong>Design procedure:<\/strong><\/p>\n<ol>\n<li>Design exterior footing. Check shear stresses and design flexural reinforcement.<\/li>\n<li>Design interior footing. Check shear stresses and design flexural reinforcements.<\/li>\n<li>Design footing strap as a reinforced concrete beam.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Design of Strap footing Introduction When \u00a0two \u00a0columns are reasonably close, a combined footing is designed for both columns as shown in below. When two columns are far apart, a strap is designed to transfer eccentric moment between two columns as shown in below. The goal is to have uniform bearing pressure and to minimize &hellip;<\/p>\n","protected":false},"author":2264,"featured_media":1828,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"two_page_speed":[],"footnotes":""},"categories":[58],"tags":[113,204,102],"class_list":["post-1821","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-structural","tag-footing","tag-strap-footing","tag-structural-design"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Design of Strap Footing<\/title>\n<meta name=\"description\" content=\"Design of Strap footing Introduction Combined footings and strap footings are normal used when one of columns\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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