顶层梁、柱的钢筋锚固是怎么规定的?
现在手上没有图籍,最好能直接给出答案
推荐回答(3个)
柱中纵向钢筋的配置应符合下列规定:
纵向受力钢筋直径不宜小于12mm;全部纵向钢筋的配筋率不宜大于5%;
柱中纵向钢筋的净间距不应小于50mm,且不宜大于300mm;
偏心受压柱的截面高度不小于600mm时,在柱的侧面上应设置直径不小于10mm的纵向构造钢筋,并相应设置复合箍筋或拉筋;
圆柱中纵向钢筋不宜少于8根,不应少于6根,且宜沿周边均匀布置;
在偏心受压柱中,垂直于弯矩作用平面的侧面上的纵向受力钢筋以及轴心受压柱中各边的纵向受力钢筋,其中距不宜大于300mm。
扩展资料:
选用
另外,当钢筋为HRB335级和HRB400级其直径大于25mm时,锚固长度应再乘1.1的修正系数。
在地震区还应根据抗震等级再乘一个系数:抗震等级一、二级时系数为1.15;三级时系数为1.05;四级时系数为1.0。
混凝土中受压钢筋的锚固长度为受拉钢筋锚固长度的0.7倍。
以上是钢筋锚固长度的计算方法,在施工图中的设计说明部分,一般都有对钢筋锚固长度的要求,可以根据图中的要求进行检查。
钢筋锚固
钢筋锚固长度规范:在混凝土结构基本理论中,受混凝土的极限应变值的限制,强度过高的钢筋发挥不出其全部作用(这正是混凝土设计规范和施工规范不设Ⅳ级钢筋的理论依据)。所以,即便是Ⅳ级钢筋,其强度设计值也只能取到360N/mm2(与Ⅲ级钢筋相同),且当用于轴心受拉和小偏心受拉构件时只能按300N/mm2取用。因此,高于Ⅲ级的钢筋的锚固长度取值按Ⅲ级钢筋即可。
Ⅳ级钢筋的塑性性能和可焊性比新Ⅲ级钢筋差,用在普通混凝土结构中并不合适,也不经济。
参考资料来源:百度百科-钢筋锚固
柱有三种:03G101-1P43
当直锚长度当直锚长度≥LaE时,则采用直锚形式,柱纵向筋至柱顶后截断.锚固长度=梁高-保护层
边柱的外纵向筋锚固长度自梁底至柱纵筋断点≥1.5 LaE,与梁上部纵筋搭接.当柱外侧纵向筋的配筋率>1.2%时,第一批柱外侧纵向筋锚固长度自梁底至柱纵筋断点≥1.5 LaE,第二批柱外侧纵向筋锚固长度自梁底至柱纵筋断点≥1.5 LaE+20d。
梁详03G101-1P55构造(一)
框架梁上部钢筋:
左右锚固长度取值判断
当hc-保护层(直锚长度)>LaE时,取Max(LaE,0.5hc+5d);
当hc-保护层(直锚长度)≤LaE时,必须弯锚,这时有以下几种算法:
算法1、hc-保护层+15d
算法2、取0.4LaE+15d
算法3、取Max(LaE,0.5hc-保护层+15d);
算法4、取Max(LaE,0.4LaE+15d)。
好象都与普通楼层方法一样。
有一点不同:
屋面框架梁端支座锚固长度=hc-保护层+梁高-保护层
还有一点,当柱纵筋直径≥25时,在柱宽范围内柱箍筋内侧设间距≤150,但不少时3Φ10的角部附加筋,角筋长度为300+300。
上述为柱锚入梁,详03G101-1P55构造(一),图集中还有一种做法为梁锚入柱,我就不说了,你看图集吧,详03G101-1P56构造(二)。
钢筋砼结构施工及验收规范
这里下载
http://iask.sina.com.cn/browse/download.php?path=/87/58/05/1272875805.8026354.pdf&filename=钢筋锚固长度.pdf
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