At last, the thesis emphatically studies the fatigue load spectrum of double-deck bridge, and provides the fatigue load spectrum of bridges that bear straddle type monorail loads.

• 最后，以重庆菜园坝长江大桥为背景，重点研究了公轨两用钢桁桥疲劳荷载谱的制定方法，提出了重庆跨座式轨道交通荷载作用下的桥梁荷载谱。