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变截面柱采用一点起吊,当柱子不太长时,吊点的位置通常设在柱牛腿根部,一般不需计算,但需复核抗弯强度或抗裂度。计算内力可按一端带有悬臂的简支梁进行分析。验算时,荷载一般应将构件自重力乘以动力系数1.5,根据受力实际情况,动力系数可适当增减。柱子一般均为平卧预制,中等长度的柱子,均可采取一点不翻身平吊,吊点位置确定后,据此复核产生最大弯矩处的抗弯强度。当满足抗弯强度计算要求,即认为满足不翻身平吊要求。对特殊要求的柱,应进行抗裂验算,要求其满足抗裂度条件或裂缝宽度限制。可按下式计算:
The variable cross-section column adopts one-point lifting. When the column is not too long, the position of the suspension point is usually set at the root of the column bovine leg. Generally, no calculation is needed, but the bending strength or crack resistance needs to be reviewed. The calculated internal force can be analyzed by a simple beam with a cantilever at one end. When checking, the load should generally be multiplied by the force coefficient by 1.5 from the weight of the component. According to the actual situation of the force, the dynamic coefficient can be increased or decreased appropriately. Columns are generally horizontally prefabricated, medium-length columns, can take a little do not turn flat hanging, hanging point position is determined, based on this review of the maximum bending moment at the bending strength. When the calculation requirements for bending strength are satisfied, it is considered that the requirements for non-turning flat lifting are satisfied. Columns with special requirements shall be subjected to anti-crack checking, and they shall be required to meet the conditions of crack resistance or crack width restrictions. Can be calculated as follows: