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对某斜拉桥桥塔锚固区布置的双层环向预应力筋进行优化研究。将单位环向预应力筋对锚固区的预应力效应和正常工作拉索荷载对锚固区的索力效应分别单独进行考虑,然后采用线性叠加,得出了两者在锚固区的效应。通过考虑各种约束函数,并结合预应力筋数量最小这一目标函数,对某斜拉桥桥塔锚固区现有的环向预应力筋布置方式进行优化研究。优化研究表明:桥塔锚固区仅仅采用环向预应力筋布置时,长短边的应力和抗裂安全系数都不可能均匀;另外,预应力筋布置在锚固区偏外侧的位置时,所需预应力筋数量最少。
The optimization of double prestressing tendons in the anchorage zone of a cable-stayed bridge was carried out. The effect of prestressing force of anchorage zone and prestressing force of anchorage zone of normal circular cable to the cable force effect of anchorage zone of normal working cable load are separately considered respectively. Then the effect of both of them in anchorage zone is obtained by linear superposition. By considering various constraint functions and combining with the objective function of minimizing the amount of prestressing tendons, the existing arrangement of circumferential prestressing tendons in anchorage zone of a cable-stayed bridge was optimized. The optimization research shows that the stress and crack safety factor of the long and short sides can not be uniform when only the annular prestressing tendons are arranged in the anchorage zone of the pylon. In addition, when the prestressing tendons are arranged outside the anchorage zone, The least amount of stress bar.