{"id":145,"date":"2026-02-20T13:24:31","date_gmt":"2026-02-20T13:24:31","guid":{"rendered":"https:\/\/brgt.com.br\/blog-admin\/?p=145"},"modified":"2026-02-20T13:27:34","modified_gmt":"2026-02-20T13:27:34","slug":"reduzindo-o-fpk-na-alvenaria-estrutural-ponderadores-de-carga-e-reducao-de-sobrecarga-no-tqs","status":"publish","type":"post","link":"https:\/\/brgt.com.br\/blog-admin\/reduzindo-o-fpk-na-alvenaria-estrutural-ponderadores-de-carga-e-reducao-de-sobrecarga-no-tqs\/","title":{"rendered":"Reduzindo o fpk na Alvenaria Estrutural: Ponderadores de Carga e Redu\u00e7\u00e3o de Sobrecarga no TQS"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Ao dimensionar um edif\u00edcio em alvenaria estrutural, o <strong>fpk<\/strong> (resist\u00eancia caracter\u00edstica \u00e0 compress\u00e3o do prisma) \u00e9 o par\u00e2metro que define diretamente o custo do bloco. Um fpk menor significa blocos mais baratos, log\u00edstica mais simples e, em muitos casos, a viabilidade do pr\u00f3prio empreendimento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Neste artigo, mostramos como dois ajustes normativos \u2014 <strong>corre\u00e7\u00e3o dos coeficientes de pondera\u00e7\u00e3o Psi<\/strong> e <strong>redu\u00e7\u00e3o de cargas vari\u00e1veis da NBR 6120:2019<\/strong> \u2014 impactam o dimensionamento real de um edif\u00edcio de 17 pavimentos processado no TQS Alvest.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">O projeto de estudo<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>17 pisos (Tipo 1 ao 3, Tipo 4 ao 7, Tipo 8 ao 10, Tipo 11 ao 13, Tipo 14, Rooftop e Reservat\u00f3rios)<\/li>\n\n\n\n<li>Alvenaria estrutural com blocos vazados de concreto, espessura 14 cm<\/li>\n\n\n\n<li>40 subestruturas por pavimento<\/li>\n\n\n\n<li>Altura total de 49,70 m<\/li>\n\n\n\n<li>Vento: V0 = 33 m\/s, Categoria IV, Classe B<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Modelos analisados<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Modelo<\/th><th>Descri\u00e7\u00e3o<\/th><\/tr><\/thead><tbody><tr><td><strong>Original<\/strong><\/td><td>Crit\u00e9rios default do TQS<\/td><\/tr><tr><td><strong>Psis<\/strong><\/td><td>Coeficientes Psi corrigidos conforme NBR 8681<\/td><\/tr><tr><td><strong>RedSobrec<\/strong><\/td><td>Psis corrigidos + Redu\u00e7\u00e3o de sobrecarga conforme NBR 6120:2019<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Ajuste 1: Coeficientes de pondera\u00e7\u00e3o Psi<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">O que s\u00e3o os coeficientes Psi<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Os coeficientes Psi (\u03a8\u2080, \u03a8\u2081 e \u03a8\u2082) definem como as a\u00e7\u00f5es vari\u00e1veis participam das combina\u00e7\u00f5es de carregamento:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u03a8\u2080<\/strong> \u2014 Fator de combina\u00e7\u00e3o (ELU)<\/li>\n\n\n\n<li><strong>\u03a8\u2081<\/strong> \u2014 Fator frequente (ELS-Fr)<\/li>\n\n\n\n<li><strong>\u03a8\u2082<\/strong> \u2014 Fator quase-permanente (ELS-QP)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">O problema: valores default do TQS<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Coeficiente<\/th><th>Default TQS<\/th><th>Norma (NBR 8681)<\/th><\/tr><\/thead><tbody><tr><td>\u03a8\u2080 (ELU)<\/td><td>0,8<\/td><td><strong>0,5<\/strong><\/td><\/tr><tr><td>\u03a8\u2081 (ELS-Fr)<\/td><td>0,7<\/td><td><strong>0,4<\/strong><\/td><\/tr><tr><td>\u03a8\u2082 (ELS-QP)<\/td><td>0,6<\/td><td><strong>0,3<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Crit\u00e9rios default do TQS<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"574\" height=\"286\" src=\"https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-1.png\" alt=\"\" class=\"wp-image-146\" srcset=\"https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-1.png 574w, https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-1-300x149.png 300w\" sizes=\"auto, (max-width: 574px) 85vw, 574px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Crit\u00e9rios corrigidos Psi<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"574\" height=\"286\" src=\"https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-2.png\" alt=\"\" class=\"wp-image-147\" srcset=\"https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-2.png 574w, https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-2-300x149.png 300w\" sizes=\"auto, (max-width: 574px) 85vw, 574px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Impacto no dimensionamento<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A corre\u00e7\u00e3o dos Psi <strong>n\u00e3o altera as cargas verticais<\/strong> nem a tens\u00e3o de compress\u00e3o pura (falv,c). O que muda \u00e9 a participa\u00e7\u00e3o da carga acidental nas combina\u00e7\u00f5es com vento, alterando o equil\u00edbrio entre compress\u00e3o e flex\u00e3o \u2014 e consequentemente o fpk necess\u00e1rio.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Ajuste 2: Redu\u00e7\u00e3o de cargas vari\u00e1veis (NBR 6120:2019, item 6.12)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Fundamenta\u00e7\u00e3o normativa<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A NBR 6120:2019 permite reduzir as cargas vari\u00e1veis quando h\u00e1 pisos adjacentes com mesmo tipo de uso. O princ\u00edpio \u00e9 estat\u00edstico: a probabilidade de todos os pavimentos estarem simultaneamente carregados diminui conforme o n\u00famero de pisos aumenta.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Aplica\u00e7\u00e3o no TQS<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Pisos<\/th><th>Redutor<\/th><th>Pavimento<\/th><\/tr><\/thead><tbody><tr><td>12<\/td><td>0,00<\/td><td>Tipo 11 ao 13<\/td><\/tr><tr><td>11<\/td><td>0,20<\/td><td>Tipo 11 ao 13<\/td><\/tr><tr><td>10<\/td><td>0,40<\/td><td>Tipo 8 ao 10<\/td><\/tr><tr><td>09<\/td><td>0,60<\/td><td>Tipo 8 ao 10<\/td><\/tr><tr><td>01\u201308<\/td><td>0,60<\/td><td>Tipo 1 ao 10<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tabela redutores TQS<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"586\" height=\"322\" src=\"https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-3.png\" alt=\"\" class=\"wp-image-148\" srcset=\"https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-3.png 586w, https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-3-300x165.png 300w\" sizes=\"auto, (max-width: 586px) 85vw, 586px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Impacto no dimensionamento<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A redu\u00e7\u00e3o de sobrecarga <strong>diminui diretamente a carga vertical acumulada<\/strong>, reduzindo tanto a tens\u00e3o de compress\u00e3o (falv,c) quanto o fpk necess\u00e1rio.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Resultados comparativos<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Compara\u00e7\u00e3o modelos TQS<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"661\" src=\"https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-4-1024x661.png\" alt=\"\" class=\"wp-image-149\" srcset=\"https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-4-1024x661.png 1024w, https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-4-300x194.png 300w, https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-4-768x496.png 768w, https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-4-1536x992.png 1536w, https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-4-1200x775.png 1200w, https:\/\/brgt.com.br\/blog-admin\/wp-content\/uploads\/2026\/02\/Imagem-4.png 1801w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Resumo geral<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Modelo<\/th><th>falv,c m\u00e9dio<\/th><th>falv,c m\u00e1x<\/th><th>fpk m\u00e9dio<\/th><th>fpk m\u00e1x<\/th><th>\u0394 falv,c<\/th><th>\u0394 fpk<\/th><\/tr><\/thead><tbody><tr><td><strong>Original<\/strong><\/td><td><strong>219,0<\/strong><\/td><td><strong>299,8<\/strong><\/td><td><strong>1151,9<\/strong><\/td><td><strong>1489,0<\/strong><\/td><td>\u2014<\/td><td>\u2014<\/td><\/tr><tr><td>Psis<\/td><td>219,0<\/td><td>299,8<\/td><td>1122,2<\/td><td>1416,9<\/td><td>0,0%<\/td><td><strong>-2,6%<\/strong><\/td><\/tr><tr><td>Psis + RedSobrec<\/td><td>205,8<\/td><td>269,5<\/td><td>1074,9<\/td><td>1367,7<\/td><td><strong>-6,0%<\/strong><\/td><td><strong>-6,7%<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclus\u00e3o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A simples confer\u00eancia de dois par\u00e2metros de carregamento \u2014 <strong>coeficientes Psi<\/strong> e <strong>redu\u00e7\u00e3o de sobrecarga<\/strong> \u2014 pode gerar uma economia de quase <strong>7% no fpk de dimensionamento<\/strong> sem qualquer altera\u00e7\u00e3o na geometria ou detalhamento do projeto.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para edif\u00edcios altos em alvenaria estrutural, onde o fpk dos pisos inferiores governa a especifica\u00e7\u00e3o dos blocos, essa diferen\u00e7a \u00e9 significativa.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Estudo realizado pela equipe BRGT Estruturas utilizando o TQS Alvest V25 e ferramentas internas desenvolvidas em Python.<\/em><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Gostou do conte\u00fado? Nos siga nas redes sociais e n\u00e3o perca nenhuma novidade!!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ao dimensionar um edif\u00edcio em alvenaria estrutural, o fpk (resist\u00eancia caracter\u00edstica \u00e0 compress\u00e3o do prisma) \u00e9 o par\u00e2metro que define diretamente o custo do bloco. Um fpk menor significa blocos mais baratos, log\u00edstica mais simples e, em muitos casos, a viabilidade do pr\u00f3prio empreendimento. Neste artigo, mostramos como dois ajustes normativos \u2014 corre\u00e7\u00e3o dos coeficientes &hellip; <a href=\"https:\/\/brgt.com.br\/blog-admin\/reduzindo-o-fpk-na-alvenaria-estrutural-ponderadores-de-carga-e-reducao-de-sobrecarga-no-tqs\/\" class=\"more-link\">Continue lendo<span class=\"screen-reader-text\"> &#8220;Reduzindo o fpk na Alvenaria Estrutural: Ponderadores de Carga e Redu\u00e7\u00e3o de Sobrecarga no TQS&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":151,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pagelayer_contact_templates":[],"_pagelayer_content":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-145","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/posts\/145","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/comments?post=145"}],"version-history":[{"count":3,"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/posts\/145\/revisions"}],"predecessor-version":[{"id":154,"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/posts\/145\/revisions\/154"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/media\/151"}],"wp:attachment":[{"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/media?parent=145"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/categories?post=145"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/brgt.com.br\/blog-admin\/wp-json\/wp\/v2\/tags?post=145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}