锚固螺栓锚栓用于上部钢结构与下部基础的连接，承受柱弯矩在柱脚底板与基础间产生的拉力，剪力由柱底板与基础面之间的摩擦力抵抗，若摩擦力不足以抵抗剪力，则需在柱底板上焊接抗剪键以增大抗剪能力。
锚栓一头埋入混凝土中，埋入的长度要以混凝土对其的握裹力不小于其自身强度为原则，所以对于不同的混凝土标号和锚栓强度，所需最小埋入长度也不一样。
为了增加握裹力，对于Φ39以下锚栓，需将其下端弯成L型，弯钩的长度为4D；对于Φ39以上锚栓，因其直径过大不便于折弯，则在其下端焊接锚固板。
锚栓的锚固及构造详见表7-5与表7-6。
259表7-5-1Q235 钢锚栓选用表锚栓直径d (mm) 锚栓截面有效面积A0(cm)连接尺寸锚固长度及细部尺寸每个螺栓的受拉承载力设计值taN(KN)Ⅰ型Ⅱ型Ⅲ型单螺母双螺母锚固长度 l (mm)锚板尺寸a(mm)b(mm)a(mm)b(mm)当基础混凝土的强度等级为 C(mm)t(mm)C15 C20 C15 C20 C15 C2020 22 24 27 3033 36 39 42 45 2.4483.0343.5254.5945.6066.9368.1679.75811.2113.06454550505555606570757575808085909510010511060657075808590951001059095100105110120125130135140500550600675750825900100040044048054060066072078010501125840900630675505540140140202034.342.549.464.378.597.1114.3136.6156.9182.8260表7-5-2Q235 钢锚栓选用表锚栓直径d (mm) 锚栓截面有效面积A0(cm)连接尺寸锚固长度及细部尺寸每个螺栓的受拉承载力设计值taN(KN)Ⅰ型Ⅱ型Ⅲ型单螺母双螺母锚固长度 l (mm)锚板尺寸a(mm)b(mm)a(mm)b(mm)当基础混凝土的强度等级为 C(mm)t(mm)C15 C20 C15 C20 C15 C2048 52 56 6064 68 72 76 80 14.7317.5820.3023.6226.7630.5534.6038.8943.4480859095100105110115120120125130135145150155160165110120130140150160170180190150160170180195205215225235120013001400150016001700180019002000960104011201200128013601440152016007207808409009601020108011401200575625670720770815865910960200200200240240280280320350202020252530303040206.2246.1284.2330.7374.6427.7484.4544.5608.2261表7-5-3 Q235 钢锚栓选用表锚栓直径d (mm) 锚栓截面有效面积A0(cm)连接尺寸锚固长度及细部尺寸每个螺栓的受拉承载力设计值taN(KN)Ⅰ型Ⅱ型Ⅲ型单螺母双螺母锚固长度 l (mm)锚板尺寸a(mm)b(mm)a(mm)b(mm)当基础混凝土的强度等级为 C(mm)t(mm)C15 C20 C15 C20 C15 C2085 90 95 100 49.4855.9162.7369.95130140150160180190200210200210220230250260270280212522502375250017001800190020001275135014251500102010801140120035040045050040404545692.7782.7878.2979.3262表7-6-1Q345 钢锚栓选用表锚栓直径d (mm) 锚栓截面有效面积A0(cm)连接尺寸锚固长度及细部尺寸每个螺栓的受拉承载力设计值taN(KN)Ⅰ型Ⅱ型Ⅲ型单螺母双螺母锚固长度 l (mm)锚板尺寸a(mm)b(mm)a(mm)b(mm)当基础混凝土的强度等级为 C(mm)t(mm)C15 C20 C15 C20 C15 C2020 22 24 27 3033 36 39 42 45 2.4483.0343.5254.5945.6066.9368.1679.75811.2113.064545505055556065707575758080859095100105110606570758085909510010590951001051101201251301351406006607208109009901080117050055060067575062590010001260135010501125755810630675140140202044.154.663.582.7100.9124.8147.0175.6201.8235.1263表7-6-2 Q345 钢锚栓选用表锚栓直径d (mm) 锚栓截面有效面积A0(cm)连接尺寸锚固长度及细部尺寸每个螺栓的受拉承载力设计值taN(KN)Ⅰ型Ⅱ型Ⅲ型单螺母双螺母锚固长度 l (mm)锚板尺寸a(mm)b(mm)a(mm)b(mm)当基础混凝土的强度等级为 C(mm)t(mm)C15 C20 C15 C20 C15 C2048 52 56 6064 68 72 76 80 14.7317.5820.3023.6226.7630.5534.6038.8943.448085909510010511011512012012513013514515015516016511012013014015016017018019015016017018019520521522523514401560168018001920204021602280240012001300140015001600170018001900200086593510101080115012251300137014407207808409009601020108011401200200200200240240280280320350202020252530303040265.1316.4365.4425.2481.7549.9622.8700.0781.9264表7-6-3 Q345 钢锚栓选用表锚栓直径d (mm) 锚栓截面有效面积A0(cm)连接尺寸锚固长度及细部尺寸每个螺栓的受拉承载力设计值taN(KN)Ⅰ型Ⅱ型Ⅲ型单螺母双螺母锚固长度 l (mm)锚板尺寸a(mm)b(mm)a(mm)b(mm)当基础混凝土的强度等级为 C(mm)t(mm)C15 C20 C15 C20 C15 C2085 90 95 100 49.4855.9162.7369.95130140150160180190200210200210220230250260270280255027002850300021252250237525001530162017101800127513501425150035040045050040404545890.6100611291259265。