鋼筋外徑、彎折、錨固長(zhǎng)度

鋼筋彎鉤,,,,,,,,,,,,,,,,,,

彎鉤計(jì)算依據(jù)《公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范》（JTGD62-2004）9.1.5、9.1.6條,,,,,,,,,,,,,,,,,,

9.1.5受拉鋼筋端部彎鉤應(yīng)符合表9.1.5規(guī)定。,,,,,,,,,,,,,,,,,,

,表9.1.5受拉鋼筋末端彎鉤,,,,,,,,,,,,,,,,,

,彎曲部位,,,,彎曲角度,形狀,,,,鋼筋,,彎曲直徑（D）,,平直段長(zhǎng)度,,彎鉤增長(zhǎng),,

,末端彎鉤,,,,180°,,,,,R235,,≥2.5d,,≥3d,,"(D+d)απ/360

+3d－(D+d)/2",,

,,,,,135°,,,,,HRB335,,≥4d,,≥5d,,"(D+d)απ/360

+5d－(D+d)/2",,

,,,,,,,,,,"HRB400

KL400",,≥5d,,,,,,

,,,,,90°,,,,,HRB335,,≥4d,,≥10d,,"(D+d)απ/360

+10d－(D+d)/2",,

,,,,,,,,,,"HRB400

KL400",,≥5d,,,,,,

,中間彎折,,,,≤90°,,,,,各種鋼筋,,≥20d,,--,,"(D+d)απ/360－

(D+d)tan(α/2)",,

,α：鋼筋彎曲角度（單位：°）,,,,,,,,,,,,,,,,,

,"注：采用環(huán)氧樹(shù)脂涂層鋼筋時(shí)，除應(yīng)滿足表內(nèi)規(guī)定外，當(dāng)鋼筋直徑d≤20mm時(shí)，彎鉤內(nèi)直徑D不應(yīng)小于4d；

當(dāng)鋼筋直徑d＞20mm時(shí)，彎鉤內(nèi)直徑D不應(yīng)小于6d；直線段長(zhǎng)度不應(yīng)小于5d。",,,,,,,,,,,,,,,,,

9.1.6箍筋的末端應(yīng)做成彎鉤。彎鉤角度可取135°。彎鉤的彎曲直徑應(yīng)大于被箍的受力主鋼筋的直徑，且R235鋼筋不應(yīng)小于箍筋直徑的2.5倍，HRB335鋼筋不應(yīng)小于箍筋直徑的4倍。彎鉤平直段長(zhǎng)度，一般結(jié)構(gòu)不應(yīng)小于箍筋直徑的5倍，抗震結(jié)構(gòu)不應(yīng)小于箍筋直徑的10倍。,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,

鋼筋彎鉤,,,,,,,,,,,,,,,,,,

"公稱直徑

（mm）",熱軋帶肋鋼筋(HRB),,,,"公稱橫截面積

（mm2）","公稱重量

（kg/m）",鋼筋末端彎鉤增長(zhǎng)（mm）,,,,,鋼筋中間彎折長(zhǎng)度折減D=20d,,,,中間彎折長(zhǎng)度折減(mm),,

,,,,,,,180°,135°,,90°,,30°,45°,60°,90°,90°,,

,"內(nèi)徑

（mm）","橫肋高

（mm）","縱肋高

（mm）","外徑

（mm）",,,R235,HRB335,HRB400KL400,HRB335,HRB400KL400,"各種

鋼筋","各種

鋼筋","各種

鋼筋","各種

鋼筋",R235D=2.5d,HRB335D=4d,HRB400D=5d

6,5.8,0.6,0.8,7.0,28.27,0.222,40,50,54,69,70,-1,-3,-7,-27,-5,--,--

6.5,--,--,--,--,33.18,0.260,44,--,--,--,--,-1,-3,-7,-29,-5,--,--

8,7.7,0.8,1.1,9.3,50.27,0.395,54,67,73,91,94,-1,-4,-9,-36,-6,--,--

10,9.6,1.0,1.3,11.6,78.54,0.617,67,84,91,114,117,-1,-5,-11,-45,-8,-11,-13

12,11.5,1.2,1.6,13.9,113.1,0.888,81,101,109,137,141,-2,-5,-14,-54,-9,-13,-15

14,13.4,1.4,1.8,16.2,153.9,1.21,94,117,127,160,164,-2,-6,-16,-63,-11,-15,-18

16,15.4,1.5,1.9,18.4,201.1,1.58,108,134,145,183,187,-2,-7,-18,-72,-12,-17,-21

18,17.3,1.6,2.0,20.5,254.5,2.00,121,151,163,206,211,-2,-8,-20,-81,-14,-19,-23

20,19.3,1.7,2.1,22.7,314.2,2.47,135,168,181,229,234,-3,-9,-23,-90,-15,-21,-26

22,21.3,1.9,2.4,25.1,380.1,2.98,148,185,200,251,258,-3,-10,-25,-99,-17,-24,-28

25,24.2,2.1,2.6,28.4,490.9,3.85,169,210,227,286,293,-3,-11,-28,-113,-19,-27,-32

28,27.2,2.2,2.7,31.6,615.8,4.83,--,235,254,320,328,-4,-13,-32,-126,-21,-30,-36

32,31.0,2.4,3.0,35.8,804.2,6.31,--,268,290,366,375,-4,-14,-36,-144,-24,-34,-41

36,35.0,2.6,3.2,40.2,1018,7.99,--,302,326,411,422,-5,-16,-41,-162,-27,-39,-46

40,38.7,2.9,3.5,44.5,1257,9.87,--,336,363,457,468,-5,-18,-45,-180,-30,-43,-52

50,48.5,3.2,3.8,54.9,1963,15.41,--,420,453,571,586,-6,-23,-56,-225,-38,-54,-64

公稱直徑、內(nèi)徑、外徑、面積、重量依據(jù)：1、熱軋光圓鋼筋《鋼筋混凝土用鋼第1部分：熱軋光圓鋼筋》(GB1499.1-2008)；,,,,,,,,,,,,,,,,,,

2、熱軋帶肋鋼筋《鋼筋混凝土用鋼第2部分：熱軋帶肋鋼筋》(GB1499.2-2007)。,,,,,,,,,,,,,,,,,,

上表計(jì)算彎曲直徑（D）時(shí)均采用公稱直徑，計(jì)算鋼筋中心的彎曲直徑時(shí)采用（D+公稱直徑）,,,,,,,,,,,,,,,,,,

"采用環(huán)氧樹(shù)脂涂層鋼筋采用環(huán)氧樹(shù)脂涂層鋼筋時(shí)，除應(yīng)滿足表內(nèi)規(guī)定外：當(dāng)鋼筋直徑d≤20mm時(shí)，彎鉤內(nèi)直徑D不應(yīng)小于4d；

當(dāng)鋼筋直徑d＞20mm時(shí)，彎鉤內(nèi)直徑D不應(yīng)小于6d；