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以西南地区某大桥结构荷载效应分析为例,研究了双塔双索面斜拉桥结构在恒载、活载、温度荷载作用下,边跨1/2、中跨1/4、中跨1/2、中跨3/4截面处的位移、应力以及索力等参数的力学响应。研究结果表明:1)在恒载作用下,中跨1/2处挠度最大,主梁监测截面和索塔根部均处于受压状态,跨中截面附近出现最大压应力,达10.1MPa;2)在活载作用下,中跨1/2处竖向位移达最大值,而主塔监测截面应力位于-4~0.7MPa区间内;3)在温度荷载作用下,主梁监测截面在升温与降温两种情况下的竖向位移大小相等,挠度方向相反,应力基本呈对称分布,索力负值最大处为13#拉索处。
Taking the analysis of the structure load effect of a bridge in the southwest of China as an example, the effect of the load-carrying effect of the double-tower double cable plane cable-stayed bridge on the condition of constant load, live load and temperature load was studied. / 2, mid-span 3/4 section of the displacement, stress and cable force and other parameters of the mechanical response. The results show that: 1) Under the action of constant load, the deflection at the middle span is the largest, the monitoring section of the main girder and the root of the tower are all under compression, and the maximum compressive stress occurs near the mid- Under the action of live load, the vertical displacement of mid-span halfway up to the maximum value, while the monitoring section of main tower section stress lies in the range of -4 ~ 0.7MPa; 3) Under the temperature load, In both cases, the vertical displacements are equal in size and opposite in direction of deflection. The stress is basically symmetrical and the maximum value of the cable force is at 13 # of the cable.