How to calculate the free term of force method

1.

1. The statically indeterminate times of the original structure are determined

2. Select the statically determined basic structure (after removing the rendant constraints, it is called the basic structure, and the equivalent system of the original structure is obtained by replacing the rendant constraints with the rendant unknown forces)

3. Write the typical equation of force method

The internal force diagram of each unit and the internal force diagram of load of the equivalent system are made, and the coefficients and free terms in the typical equation are calculated accordingly

The typical equations are solved and the rendant unknown forces are obtained

The internal force diagram was made by superposition

7. Static balance check + displacement condition check

The common constraint types of stress analysis are as follows: (1) the constraint is placed along the normal line of the contact surface.

(2) the constraint is perpendicular to the axis of rotation, but the direction is uncertain. It is usually expressed by two component forces which are perpendicular to each other and perpendicular to the axis of rotation.

(3) the constraint is over the center of the ball, (4) the binding force of the roller seat is perpendicular to the contact surface of the roller seat.

(5) the binding force of the journal bearing and the thrust bearing is perpendicular to the rotating shaft, but its direction is unknown, The thrust bearing is equal to the journal bearing, plus the applied force, three components can be drawn, one component is along the axis, and the other two components are perpendicular to each other

for the mechanical calculation of complex structure, sometimes it is necessary to separate each component from the joint and draw the force diagram of each component separately. At this time, it must be noted that the force diagram shows that the binding force at the joint obeys the law of force and reaction

2. No, as long as the address is sent out, it will wait for confirmation. Wait, wait

3.

The bus from Rao to Wannian takes the bus at the passenger transport center station, and the first and last time is 7:30 and 16:50:

4. Take a bus at Daihu Road coach station in Shangrao City. There are only cars, not trains that go through ten thousand years

5. Wannian County, Shangrao City, Jiangxi Province Shangrao: 6:30 / 08:00 / 9:30 / 11:50 / 12:50 / 14:10 / 15:40
Wannian bus station: 0793-3840991
Jiande Road

6. 1. From {Zhongshan West Road} to {West Road}, go to {Nanmen road} 0.5km
2. Turn to {right} 0.5km at {Gandongbei Avenue}
3. Turn to {right} 0.6km at {Shengli Road}
4. Turn to {right} 1.7km at {Daihu road}
5. Turn to {left} 4.2km at {Sanqingshan Avenue}
6. Turn to {left}, Continue along {Sanqingshan Avenue} for 0.6km
7. Turn slightly to {right} at {320 national highway / Ping'an Avenue} and continue along national highway 320 for 2.2km
8. Turn 9m to {left} at {Liwen expressway entrance}
9. Go up the ramp and charge 0.7km for some sections of {Liwen Expressway}
10, Take {Liwen Expressway} and the toll is 103km
11. Take the exit and go to {Jiguang Expressway} and the toll is 0.4km
12. At the intersection, continue to take {right} in the direction of {Jiguang Expressway} and take {Jiguang Expressway} and the toll is 22.2km
13. Take the exit of {Yugan / Huangjinbu / g206}, Some sections of {206 National Road} charge 0.9 km
14. Turn to {right} at {206 National Road} for 26.4 km
15. Turn to {right} at {316 provincial road} for 14.3 km
16. Continue to go up {Jiande Street} for 1.5 km
17. Turn to {right} at {60 North Avenue}

7. Shangrao Wannian location: Daihu road long distance bus station, departure time: 7:30, 8:45, 10:00, 12:40, 14:25, 15:40, 16:50.

8.

Take a bus to the long distance bus station (Daihu Road),

9. About 20 yuan, about three hours