承台抗剪计算部分

《承台抗剪计算部分》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、承台抗剪计算对CT1和CT3，依规范计算如下柱下桩基独立承台斜截面受剪承载力可按下列公式进行计算（图8.5.21）：V<βhkbftb0h0（8.5.21-1）β=1.75λ+1.0（8.5.21-2）式中：V——扣除承台及其上填土自重后相应于作用的基本组合时的斜截面的最大剪力设计值（kN）；b0——承台计算截面处的计算宽度（m）。阶梯形承台变阶处的计算宽度、锥形承台的计算宽度应按本规范附录U确定；h0——计算宽度处的承台有效高度（m）；b——剪切系数；βhk——受剪切承载力截面高度影响系数，按公式计算；l——计算截面的剪跨比

2、，。ax、ay为柱边或承台变阶处至x、y方向计算一排桩的桩边的水平距离，当l<0.3时，取l=0.3；当l>3时，取l=3。图8.5.21承台斜截面受剪计算CT1的承台抗剪验算柱编号hcmmbcmmVmaxNhmmh0mmb0mmaXmmλββhsftN/mm2ββhsftb0h0NZ360030019888201200115010001500.31.3461540.9132681.432021746Z450030019888201200115010002000.31.3461540.9132681.432021746Z570

3、030019888201200115010001000.31.3461540.9132681.432021746Z664035019888201200115010001300.31.3461540.9132681.432021746Z1564035019888201200115010001300.31.3461540.9132681.432021746Z1670035019888201200115010001000.31.3461540.9132681.432021746Z187003501988820120011501000

4、1000.31.3461540.9132681.432021746Z2164035019888201200115010001300.31.3461540.9132681.432021746Z2257030019888201200115010001650.31.3461540.9132681.432021746Z2464040019888201200115010001300.31.3461540.9132681.432021746Z2557030019888201200115010001650.31.3461540.913268

5、1.432021746Z2644040019888201200115010002300.31.3461540.9132681.432021746Z2764040019888201200115010001300.31.3461540.9132681.432021746Z3064035019888201200115010001300.31.3461540.9132681.432021746Z3160030019888201200115010001500.31.3461540.9132681.432021746Z3275030019

6、88820120011501000750.31.3461540.9132681.432021746Z3360030019888201200115010001500.31.3461540.9132681.432021746表中Vmax=Qk,max×1.35，ax=450-hc/2，其他值依规范计算得。由表可见，CT1的抗剪承载力均大于其下桩的反力设计最大值Vmax，故承台的抗剪承载力足够。CT3抗剪计算：柱编号hcmmbcmmVmaxNhmmh0mmb0mmaXmmλββhsftN/mm2ββhsftb0h0NZ7570300

7、1403865120011509001650.31.3461540.9132681.431819571Z84404001403865120011509002300.31.3461540.9132681.431819571Z96404001403865120011509001300.31.3461540.9132681.431819571Z135003001403865120011509002000.31.3461540.9132681.431819571Z195003001403865120011509002000.31.34

8、61540.9132681.431819571Z285003001403865120011509002000.31.3461540.9132681.431819571表中Vmax=Qk,max×1.35，ax=450-hc/2，其他值依规范计算得。由表可见，CT3的抗剪承载力