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大跨径双曲拱桥,拱脚的恒载轴向力(N)较拱顶大,拱脚截面压应力((?))增高。从力学观点而言,总是按其受力状况,考虑主拱圈沿着拱跨设为变截面(即变拱肋,或变拱板)。显然,这样不论是浆砌料石作拱肋,还是现地浇筑,或是无支架吊装拱肋,主拱圈的施工工艺过程,都颇为复杂。同时,为使弯矩(M)不致过多的分向拱脚,拱顶与拱脚的截面高度也不宜相差过大,否则就削弱了双曲拱的作用和意义。因此,对于大跨径双曲拱桥的设计,如何合理选用主拱圈的问题,有必要研究。
Long-span arch bridge, arch axial load (N) larger than the arch, arch foot section of the compressive stress ((?)) Increased. From the mechanical point of view, always according to their stress conditions, consider the main arch ring along the arch set as a variable cross-section (that is, variable arch, or variable arch). Obviously, whether it is mortar for the arch rib, or cast in situ, or without lifting the arch ribs, the main arch of the construction process, are quite complex. At the same time, in order to make the bending moment (M) does not cause excessive arch legs, arch and arch foot section height should not differ too much, otherwise weakened the role and significance of double arch. Therefore, for the design of large-span double-curved arch bridge, it is necessary to study how to choose the main arch ring reasonably.