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不在同一平面内的预应力曲线钢丝束(力筋),称为预应力空间曲线束。这种曲线可得到三向预应力。在大尺寸、大跨度或受力复杂的混凝土结构中,有重要的意义。众所周知,很多空间曲线方程易于建立,但要做到吻接(相切),它的要素如曲线长、空间半径、空间弧度等会涉及椭圆积分,以K函数或F函数来表达,是难于精确解的,或者表达烦复而不能为工程所用。因此,本文以园柱面旋螺线为基础,用一种数学技巧构成园柱面上新的曲线方程(笔者称为缓和空间曲线)。此曲线能精确求得各要素,又能达到吻接。
The prestressed steel wire bundles (strands) that are not in the same plane are called prestressed space curve bundles. This curve gives three-way prestress. It is of great significance in large-scale, large-span, or complex concrete structures. As we all know, many space curve equations are easy to establish, but to achieve kiss (tangent), its elements such as the curve length, space radius, space arc, etc. will involve elliptic integrals, expressed in terms of K-functions or F-functions, which are difficult to accurately Solution, or expressed annoyance can not be used for the project. Therefore, this paper uses a mathematical technique to construct a new curve equation on the cylinder surface based on the circular spiral of the cylinder surface (the author calls it the relaxation space curve). This curve can accurately find all the elements and achieve kiss connection.