<p>refers to the combination of earthquake action value of product ratio and total cross section area and the axial compressive strength of the concrete column design value of 1 axis pressure: 2 when the concrete strength grade of C65 and C70. The limit value of axial compression ratio should be determined by the data in table 0.05: reduce the concrete strength grade of C75, C80. The limit value of axial compression ratio should be determined by the data in table 0.10. Table 3 within the limits applicable to the shear </p>
<p>span ratio is greater than 2, the grade of concrete strength is higher than that of C60 column; shear span ratio is not greater than 0.05 should reduce the compression ratio of column shaft 2; the shear span ratio is less than 1.5 of the column, the limit value of axial compression ratio should be devoted to research and take special measures to construct 4 along the column; all the high cross composite hoop, and stirrup spacing is not greater than 100mm, limb distance not greater than 200mm, less than 12mm in diameter, </p>
<p>or along the column with high compound spiral hoop, and the pitch is not greater than 100mm, away from the limb is not greater than 200mm, less than 12mm in diameter, or along the column with high continuous composite rectangular spiral hoop, and screw spacing is not greater than 80mm, limb distance not greater than 200mm, less than 10mm in diameter, the limit value of axial compression ratio can be increased by 0.10 according to the data in the table. When the 5 column formed by additional longitudinal </p>
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