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Method for prolonging fatigue life of steel bridge deck by loading overload vehicle
The invention discloses a method for prolonging the fatigue life of a steel bridge deck by loading an overload vehicle, which comprises an overload vehicle and a steel cushion block, and the steel cushion block is laid at a specific position above a top plate of the steel bridge deck, so that the overload vehicle slowly travels through the steel cushion block; the fatigue cracks at the U-rib-top plate welding seam, the U-rib web and the U-rib bottom plate butt welding seam are subjected to a tensile stress greater than a standard design value, so that a plastic zone is generated at the tip of the fatigue cracks, and the aims of reducing the expansion rate of the fatigue cracks and prolonging the fatigue life of the steel bridge deck are fulfilled. According to the method, the existing fatigue crack of the steel bridge can be treated in a simple and easy-to-operate mode, so that the fatigue crack generates a plastic zone under the action of overload tensile stress, the stress mode of the tip of the fatigue crack is improved, the expansion of the fatigue crack is delayed, and the fatigue life is prolonged.
本发明公开了一种超载车加载延长钢桥面板疲劳寿命的方法，包括超载车辆和钢垫块，在钢桥面板顶板上方特定位置处铺设钢垫块，使超载车辆缓慢行驶通过钢垫块，促使U肋‑顶板焊缝和U肋腹板以及U肋底板对接焊缝处的疲劳裂纹受到一个大于标准设计值的拉应力，使疲劳裂纹尖端产生塑性区，达到降低疲劳裂纹扩展速率和延长钢桥面板疲劳寿命的目的。本发明能够以简便易操作的方式处治现存钢桥已出现的疲劳裂纹，使得疲劳裂纹在超载拉应力作用下产生塑性区，改善疲劳裂纹尖端的受力方式，延缓疲劳裂纹扩展，提高疲劳寿命。
Method for prolonging fatigue life of steel bridge deck by loading overload vehicle
The invention discloses a method for prolonging the fatigue life of a steel bridge deck by loading an overload vehicle, which comprises an overload vehicle and a steel cushion block, and the steel cushion block is laid at a specific position above a top plate of the steel bridge deck, so that the overload vehicle slowly travels through the steel cushion block; the fatigue cracks at the U-rib-top plate welding seam, the U-rib web and the U-rib bottom plate butt welding seam are subjected to a tensile stress greater than a standard design value, so that a plastic zone is generated at the tip of the fatigue cracks, and the aims of reducing the expansion rate of the fatigue cracks and prolonging the fatigue life of the steel bridge deck are fulfilled. According to the method, the existing fatigue crack of the steel bridge can be treated in a simple and easy-to-operate mode, so that the fatigue crack generates a plastic zone under the action of overload tensile stress, the stress mode of the tip of the fatigue crack is improved, the expansion of the fatigue crack is delayed, and the fatigue life is prolonged.
本发明公开了一种超载车加载延长钢桥面板疲劳寿命的方法，包括超载车辆和钢垫块，在钢桥面板顶板上方特定位置处铺设钢垫块，使超载车辆缓慢行驶通过钢垫块，促使U肋‑顶板焊缝和U肋腹板以及U肋底板对接焊缝处的疲劳裂纹受到一个大于标准设计值的拉应力，使疲劳裂纹尖端产生塑性区，达到降低疲劳裂纹扩展速率和延长钢桥面板疲劳寿命的目的。本发明能够以简便易操作的方式处治现存钢桥已出现的疲劳裂纹，使得疲劳裂纹在超载拉应力作用下产生塑性区，改善疲劳裂纹尖端的受力方式，延缓疲劳裂纹扩展，提高疲劳寿命。
Method for prolonging fatigue life of steel bridge deck by loading overload vehicle
一种超载车加载延长钢桥面板疲劳寿命的方法
KE LU (author) / LI YOULIN (author) / CHEN ZHENG (author) / LI CHUANXI (author) / GAO QIANG (author) / WEI QIANG (author) / CHEN LIANGSHENG (author) / LU FUZHOU (author) / FENG ZHENG (author) / QIU MINGDONG (author)
2024-01-12
Patent
Electronic Resource
Chinese
IPC:
E01D
BRIDGES
,
Brücken
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