桥梁工程作业汇总.doc

土硕桥梁工程作业汇总
一、朱平老师：
1. 上一次交的作业再认真做一遍，97页例题2-3-1，l。改成2米，计算最不利荷载；
2. 荷载横向分布系数计算，证明当各主梁惯性矩不相等时，偏心荷载对各主梁的总作用公式；
3. 主梁内力计算，107页例题2-3-5，计算2号主梁跨中截面、1/4截面的最大弯矩和最大剪力，以及支点截面最大剪力；
4. 横隔梁内力计算，111页例题2-3-7，求跨中横梁在1号和2号主梁之间截面的弯矩，靠近2号主梁处支座右截面的剪力，荷载等级为公里—Ⅱ级；
5. 图如下

求3#主梁处，横梁弯矩影响线；3#、4#梁间，横梁弯矩影响线；1#主梁右侧，横梁剪力影响线；2#主梁右侧，横梁剪力影响线；
6. 支座计算，这个大家都有拍照我就不详细写了。
二、赵华老师作业
作业一：视频可以到海飞和曹然那里拷
1. How to cut giant pieces of steel fast with incredible precision to make the giant steel pieces fit together precisely?

2. Once the bridge deck of Millau bridge was created, how to put it in place?

3. How to make sure 36000 tons of bridge deck, which is pressed down the wedges, to be able to slide over one another to work effectively?

4. How to construct the tallest piers (245m) ever built to specific point to a sky with a mm precision and to end up in the exactly right place?

5. How to measure the distance? How GPS works?

6. Why do we use cable stays in metal strands? Why it is better than steel chain? During the operation of the Millau Bridge, how to replace the metal strands without the bridge falling down?

7. How to overcome the temperature expansion of steel bridge deck of Millau Brdige at the starting and the ending?

8. How to overcome the temperature expansion of steel bridge deck of Millau Bridge at pier? And why it works effectively?
9. How to overcome the temperature expansion of steel bridge deck of Millau Bridge at pier? And why it works effectively?
10. Challenge question:
Considering the seasonal temperature variation and braking force of vehicle load, give some suggestion to determine the height of split position (given the height of pier , the dimension of pier (longitudinal x transverse)).
Hint: Considering the bending moments at the bottom of pier, the buckling (or the vertical stability) of the pier.
Principle: For a cable-stayed bridge with high piers, the piers must have sufficient longitudinal stiffness and flexibility to satisfy the requirement of longitudinal deformation caused by temperature load, concrete shrinkage and creep, and braking force. The lower part was designed to be a single pier with sufficient longitudinal stiffness, and the upper part was split into two parts with appropriate flexibility.
作业二：
1. How many types of bridges are there for the time being? Describe in detail the span range of types of the bridges?
2. In terms of the following different span length(250m,500m,800m,1500m),address your comments on your choice of bridges types considering the design ,construction, cost, and etc