A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Calculation method for arbitrary distribution of dead load of three-main-cable suspension bridge in transverse bridge direction
The invention discloses a calculation method for arbitrary distribution of dead loads of a three-main-cable suspension bridge in the transverse bridge direction. The calculation method comprises the steps that firstly, bearing reaction force at each suspension point is obtained according to a multipoint rigid bearing continuous beam method; comparison is made through an equivalent cross beam, and unknown numbers for calculating the unstressed lengths of the three suspenders are determined; then, a displacement coordination equation is established according to displacement coordination conditions of all the lifting points, a symmetric condition is supplemented for a symmetric section beam to establish an equation 1, and an energy conservation condition is supplemented for an asymmetric section beam to establish an equation 2; and simultaneous solution is performed on the equations to obtain an unstressed length relation of the three suspenders. And finally, the unstressed length of each suspender of the three-main-cable suspension bridge is obtained through the method. Meanwhile, dead load can be distributed according to design requirements in the transverse bridge direction by reasonably adjusting the unstressed length of the middle suspender and the side suspender, so that the axial force of the middle suspender is reduced, the stress of the middle main cable is reduced, and the torsional rigidity of the bridge is improved.
本发明公开了一种三主缆悬索桥恒载沿横桥向任意分配的计算方法，首先根据多点刚性支承连续梁法获取各吊点处的支反力；然后通过等效横梁进行比拟，确定用于计算三根吊杆无应力长度的未知数；接着通过各吊点处的位移协调条件建立位移协调方程，对于对称截面横梁补充对称条件建立方程1，对于非对称截面横梁补充能量守恒条件建立方程2；再将方程进行联立求解，得到三根吊杆的无应力长度关系。最终通过此方法获得三主缆悬索桥各吊杆的无应力长度。同时，通过合理调整中、边吊杆的无应力长度可以使得恒载沿横桥向按设计要求进行分配，从而减少中间吊杆的轴力，进而减少中主缆的受力，并提高桥梁的抗扭刚度。
Calculation method for arbitrary distribution of dead load of three-main-cable suspension bridge in transverse bridge direction
The invention discloses a calculation method for arbitrary distribution of dead loads of a three-main-cable suspension bridge in the transverse bridge direction. The calculation method comprises the steps that firstly, bearing reaction force at each suspension point is obtained according to a multipoint rigid bearing continuous beam method; comparison is made through an equivalent cross beam, and unknown numbers for calculating the unstressed lengths of the three suspenders are determined; then, a displacement coordination equation is established according to displacement coordination conditions of all the lifting points, a symmetric condition is supplemented for a symmetric section beam to establish an equation 1, and an energy conservation condition is supplemented for an asymmetric section beam to establish an equation 2; and simultaneous solution is performed on the equations to obtain an unstressed length relation of the three suspenders. And finally, the unstressed length of each suspender of the three-main-cable suspension bridge is obtained through the method. Meanwhile, dead load can be distributed according to design requirements in the transverse bridge direction by reasonably adjusting the unstressed length of the middle suspender and the side suspender, so that the axial force of the middle suspender is reduced, the stress of the middle main cable is reduced, and the torsional rigidity of the bridge is improved.
本发明公开了一种三主缆悬索桥恒载沿横桥向任意分配的计算方法，首先根据多点刚性支承连续梁法获取各吊点处的支反力；然后通过等效横梁进行比拟，确定用于计算三根吊杆无应力长度的未知数；接着通过各吊点处的位移协调条件建立位移协调方程，对于对称截面横梁补充对称条件建立方程1，对于非对称截面横梁补充能量守恒条件建立方程2；再将方程进行联立求解，得到三根吊杆的无应力长度关系。最终通过此方法获得三主缆悬索桥各吊杆的无应力长度。同时，通过合理调整中、边吊杆的无应力长度可以使得恒载沿横桥向按设计要求进行分配，从而减少中间吊杆的轴力，进而减少中主缆的受力，并提高桥梁的抗扭刚度。
Calculation method for arbitrary distribution of dead load of three-main-cable suspension bridge in transverse bridge direction
一种三主缆悬索桥恒载沿横桥向任意分配的计算方法
ZHANG WENMING (author) / LIU JIJIU (author) / WANG JINGQUAN (author) / LIU ZHAO (author)
2021-11-23
Patent
Electronic Resource
Chinese
| European Patent Office | 2020
| European Patent Office | 2024