{"id":24645,"date":"2016-10-24T16:09:35","date_gmt":"2016-10-24T14:09:35","guid":{"rendered":"https:\/\/www.geostru.eu\/ro\/?p=24645"},"modified":"2017-11-08T18:28:04","modified_gmt":"2017-11-08T16:28:04","slug":"calculul-zidurilor-de-sprijin-conform-sr-en-1997-anexa-a","status":"publish","type":"post","link":"https:\/\/www.geostru.eu\/ro\/blog\/2016\/10\/24\/calculul-zidurilor-de-sprijin-conform-sr-en-1997-anexa-a\/","title":{"rendered":"Calculul zidurilor de sprijin conform SR EN 1997 Anexa A"},"content":{"rendered":"<p style=\"text-align: justify;\">Zidurile de sprijin sunt lucrari de sustinere definitive care au rolul de a asigura stabilitatea unei sapaturi sau umpluturi.<\/p>\n<p><a href=\"http:\/\/www.mdlpl.ro\/_documente\/constructii\/reglementari_tehnice\/normativ_lucrari_sustinere.pdf\"><strong>SR EN 1997-1<\/strong><\/a> recomanda parcurgerea urmatoarelor etape in dimensionarea zidurilor de sprijin:<\/p>\n<ul>\n<li>Alegerea dimensiunilor preliminare, in conformitate cu experienta proiectantului sau recomandarilor date anterior<\/li>\n<li>Verificarea zidurilor de sprijin la starea limita ultima (GEO, EQU-USL) care surprinde urmatoarele criterii, Fig. 1:\n<ol>\n<li>Verificare la stabilitate locala si generala<\/li>\n<li>Verificare la alunecare<\/li>\n<li>Verificare la rasturnare<\/li>\n<li>Verificare la capacitate portanta a terenului de fundare<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-24647 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/zid.png\" alt=\"zid\" width=\"790\" height=\"450\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/zid.png 790w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/zid-500x285.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/zid-300x171.png 300w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/zid-768x437.png 768w\" sizes=\"(max-width: 790px) 100vw, 790px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Figura 1. Criterii de verificare a zidurilor de sprijin<\/em><\/p>\n<ul>\n<li>Dimensionarea armaturii si verificarea in sectiunile periculoase ale zidului de beton (STR\/GEO-USL)<\/li>\n<li>Verificarea zidului de sprijin la deplasari (SLS)<\/li>\n<\/ul>\n<p>Cazurile de proiectare propuse de SR EN 1997-1 sunt:<\/p>\n<table class=\" aligncenter\" style=\"width: 751.063px;\">\n<tbody>\n<tr>\n<td style=\"width: 253.466px;\"><strong>CAZUL 1<\/strong><\/td>\n<td style=\"width: 201.648px;\"><strong>CAZUL 2<\/strong><\/td>\n<td style=\"width: 275.284px;\"><strong>CAZUL 3<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 253.466px;\">Combinatia 1: (A1+M1+R1)<br \/>\nCombinatia 2: (A2+M2+R1)<\/td>\n<td style=\"width: 201.648px;\">Combinatia 1: (A1+M1+R2)<\/td>\n<td style=\"width: 275.284px;\">Combinatia 1: (A1\/A2*+M2+R3)<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 253.466px;\"><\/td>\n<td style=\"width: 201.648px;\"><\/td>\n<td style=\"width: 275.284px;\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>* coeficientii A1 pentru actiunile de tip structural, A2 pentru cele de tip geotehnic<\/em><\/p>\n<p><strong>SR EN 1997-1\/NB-2007<\/strong> recomanda Abordarea 1 si Abordarea 3.<\/p>\n<p>In conformitate cu prevederile <strong>Anexei A a SR EN 1997-1<\/strong> s-au realizat actualizari ale programului MDC referitoare la coeficientii partiali de siguranta.\u00a0Coeficienti partiali pentru verificarea la starea de echilibru limita (<strong>EQU<\/strong>):<\/p>\n<ol>\n<li>Coeficientii (\u03b3<sub>F<\/sub>) care trebuie aplicati actiunilor pentru verificarea la starea de echilibru limita (EQU)<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-24651 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/ac1.png\" alt=\"ac1\" width=\"524\" height=\"367\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/ac1.png 524w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/ac1-500x350.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/ac1-300x210.png 300w\" sizes=\"(max-width: 524px) 100vw, 524px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Tabelul 1: Coeficienti partiali pentru actiuni in constructii (\u03b3<sub>F<\/sub>)<\/em><\/p>\n<ul style=\"list-style-type: square;\">\n<li style=\"text-align: left;\">\u03b3<sub>G;dst<\/sub> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0pentru actiunile permanente defavorabile destabilizatoare<\/li>\n<li style=\"text-align: left;\">\u03b3<sub>G;stb<\/sub> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0pentru actiunile permanente favorabile stabilizatoare<\/li>\n<li style=\"text-align: left;\">\u03b3<sub>Q<\/sub><sub>;dst<\/sub>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 pentru actiunile temporare\u00a0defavorabile stabilizatoare<\/li>\n<li style=\"text-align: left;\">\u03b3<sub>Q<\/sub><sub>;stb<\/sub> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0pentru actiunile temporare\u00a0favorabile stabilizatoare<\/li>\n<\/ul>\n<p style=\"text-align: left;\">\u00a0 \u00a0 \u00a0 2. Coeficientii (\u03b3<sub>M<\/sub>) care trebuie aplicati asupra parametrilor pamantului, atunci cand se includ rezistente la forfecare cu valori inferioare:<\/p>\n<p style=\"text-align: left;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-24659 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m3.png\" alt=\"m3\" width=\"564\" height=\"288\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m3.png 564w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m3-500x255.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m3-300x153.png 300w\" sizes=\"(max-width: 564px) 100vw, 564px\" \/><\/p>\n<p style=\"text-align: center;\"><em><span style=\"font-size: 12pt;\">Tabelul 2: Coeficienti partiali pentru parametrii pamantului (\u03b3<sub>M<\/sub>)<\/span><\/em><\/p>\n<ul style=\"list-style-type: square;\">\n<li style=\"text-align: left;\">\u03b3<sub>\u03c6`<\/sub>\u00a0 \u00a0pentru tangenta unghiului de frecare interna<\/li>\n<li style=\"text-align: left;\">\u03b3<sub>c<\/sub><sub>`<\/sub>\u00a0 \u00a0 pentru coeziunea efectiva (drenta)<\/li>\n<li style=\"text-align: left;\">\u03b3<sub>cu<\/sub>\u00a0 \u00a0 pentru coeziunea nedrenata<\/li>\n<li style=\"text-align: left;\">\u03b3<sub>qu<\/sub>\u00a0 \u00a0 pentru\u00a0rezistenta la compresiune cu deformare laterala libera<\/li>\n<li style=\"text-align: left;\">\u03b3<sub>\u03b3<\/sub>\u00a0 \u00a0 \u00a0 pentru greutate volumica<\/li>\n<\/ul>\n<p>Coeficienti partiali pentru verificarea starilor limita pentru structuri (<strong>STR<\/strong>) si geotehnice (<strong>GEO<\/strong>):<\/p>\n<ol>\n<li>Coeficienti partiali pentru actiuni (\u03b3<sub>F<\/sub>) sau efecte ale actiunilor (\u03b3<sub>E<\/sub>)<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-24671 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m6.png\" alt=\"m6\" width=\"628\" height=\"251\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m6.png 628w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m6-500x200.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m6-300x120.png 300w\" sizes=\"(max-width: 628px) 100vw, 628px\" \/><\/li>\n<\/ol>\n<p style=\"text-align: center;\"><em>Tabelul 3:\u00a0Coeficienti partiali pentru actiuni (\u03b3<sub>F<\/sub>) sau efecte ale actiunilor (\u03b3<sub>E<\/sub>)<\/em><\/p>\n<ul style=\"list-style-type: square;\">\n<li>\u03b3<sub>G \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/sub> \u00a0 pentru actiunile permanente defavorabile sau favorabile<\/li>\n<li>\u03b3<sub>Q<\/sub><sub>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/sub> \u00a0 \u00a0pentru actiunile favorabile defavorabile sau favorabile<\/li>\n<\/ul>\n<p>2. \u00a0Coeficienti partiali pentru parametrii pamantului (\u03b3<sub>M<\/sub>)<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-24679 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m8.png\" alt=\"m8\" width=\"665\" height=\"352\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m8.png 665w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m8-500x265.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m8-300x159.png 300w\" sizes=\"(max-width: 665px) 100vw, 665px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Tabelul 4: Coeficienti partiali pentru parametrii pamantului (\u03b3<sub>M<\/sub>)<\/em><\/p>\n<ul style=\"list-style-type: square;\">\n<li style=\"text-align: left;\"><span style=\"font-size: 12pt;\">\u03b3<sub>\u03c6`<\/sub>\u00a0 pentru tangenta unghiului de frecare interna<\/span><\/li>\n<li style=\"text-align: left;\"><span style=\"font-size: 12pt;\">\u03b3<sub>c<\/sub><sub>`<\/sub>\u00a0 \u00a0pentru coeziunea efectiva (drenta)<\/span><\/li>\n<li style=\"text-align: left;\"><span style=\"font-size: 12pt;\">\u03b3<sub>cu<\/sub>\u00a0 \u00a0pentru coeziunea nedrenata<\/span><\/li>\n<li style=\"text-align: left;\"><span style=\"font-size: 12pt;\">\u03b3<sub>qu<\/sub>\u00a0 \u00a0pentru\u00a0rezistenta la compresiune cu deformare laterala libera<\/span><\/li>\n<li style=\"text-align: left;\"><span style=\"font-size: 12pt;\">\u03b3<sub>\u03b3<\/sub>\u00a0 \u00a0 \u00a0pentru greutate volumica<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 12pt;\">3. Coeficienti partiali de rezistenta (\u03b3<sub>R<\/sub>)<\/span><\/p>\n<p style=\"text-align: left;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-24685 aligncenter\" src=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m9.png\" alt=\"m9\" width=\"660\" height=\"224\" srcset=\"https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m9.png 660w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m9-500x170.png 500w, https:\/\/www.geostru.eu\/wp-content\/uploads\/2016\/10\/m9-300x102.png 300w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Tabelul 5: Coeficienti partiali de rezistenta (\u03b3<sub>R<\/sub>) pentru lucrari de sustinere<\/em><\/p>\n<ul style=\"list-style-type: square;\">\n<li style=\"text-align: left;\">\u03b3<sub>R;v\u00a0<\/sub>\u00a0 pentru capacitate portanta<\/li>\n<li style=\"text-align: left;\">\u03b3<sub>R;h\u00a0<\/sub>\u00a0 pentru\u00a0rezistenta la alunecare<\/li>\n<li style=\"text-align: left;\">\u03b3<sub>R;e\u00a0<\/sub>\u00a0 pentru\u00a0rezistenta\u00a0pamantului<\/li>\n<\/ul>\n<h4><strong>Calculul la starea limita ultima<\/strong><\/h4>\n<ol>\n<li>Verificarea la cedare prin alunecare conform <strong>SR EN 1997-1:2006:<\/strong><\/li>\n<\/ol>\n<p style=\"text-align: center;\"><strong>Hd&lt;Rd+Rp,d<\/strong><\/p>\n<ul style=\"list-style-type: square;\">\n<li style=\"text-align: left;\">H<sub>d\u00a0<\/sub>&#8211; valoarea de calcul a lui H<\/li>\n<li style=\"text-align: left;\">H &#8211; incarcarea orizontala sau componenta orizontala a unei actiuni totale aplicate paralel cu\u00a0baza zidului, in acest caz presiunea pamantului<\/li>\n<li style=\"text-align: left;\">R<sub>d\u00a0<\/sub>&#8211; valoarea de calcul a rezistentei fata de o actiune, in\u00a0cazul acesta forta de frecare pe baza fundatiei zidului, calculata conform paragrafului 2.4 al SR-EN 1997-1:2006<\/li>\n<li style=\"text-align: left;\">R<sub>p,d\u00a0<\/sub>&#8211; valoarea de calcul a fortei datorate presiunii pasive<\/li>\n<\/ul>\n<h4><strong>Actiuni seismice<\/strong><\/h4>\n<p>Un alt set de actualizari a fost realizat in conformitate cu <strong>Normativul pentru proiectarea lucrarilor de sustinere (Anexa A)<\/strong> referitoare la actiunile seismice.\u00a0In cazul solicitarilor seismice se\u00a0precizeaza adaugarea presiunii P<sub>s <\/sub>(presiune seismica) la presiunea masivului de pamant in conditii statice.<\/p>\n<p>Elementul de sustinere este supus unei forte de inertie in directie orizontala:<\/p>\n<p style=\"text-align: center;\">F<sub>i<\/sub>=k<sub>h<\/sub>G<\/p>\n<p style=\"text-align: left;\">G &#8211; greutatea structurii de sprijin<\/p>\n<p>k<sub>h <\/sub>\u2013 coeficient seismic in directie orizontala<\/p>\n<p style=\"text-align: center;\">k<sub>h<\/sub>=0.5\u03b3<sub>1<\/sub>(a<sub>g<\/sub>\/g)<\/p>\n<p>a<sub>g <\/sub>\u2013 acceleratia terenului pentru proiectare<\/p>\n<p>g \u2013 acceleratia terenului<\/p>\n<p>\u03b3<sub>1<\/sub> \u2013 clasa de importanta<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Zidurile de sprijin sunt lucrari de sustinere definitive care au rolul de a asigura stabilitatea unei sapaturi sau umpluturi. SR EN 1997-1 recomanda parcurgerea urmatoarelor etape in dimensionarea zidurilor de sprijin: Alegerea dimensiunilor preliminare, in conformitate cu experienta proiectantului sau recomandarilor date anterior Verificarea zidurilor de sprijin la starea limita ultima (GEO, EQU-USL) care surprinde&hellip;<\/p>\n","protected":false},"author":10348,"featured_media":24758,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[592,591],"tags":[624,635,633,634],"class_list":["post-24645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articole-geotehnic","category-articole-pentru-geologie","tag-calculul-zidurilor-sprijin","tag-sr-en-1997","tag-sr-en-1997-anexa-a","tag-ziduri-de-sprijin","category-592","category-591","description-off"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v25.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Calculul zidurilor de sprijin conform SR EN 1997 Anexa A<\/title>\n<meta name=\"description\" content=\"Calculul zidurilor de sprijin conform SR EN 1997 Anexa A - 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