桥梁工程专业英语

孟庆硕——专业英语

不对称连续钢构桥受力分析

20130322

When building a continuous girder bridge in the mountain area with rugged terrain

，

the

amount

of

piers

will

increase.

As

a

result

，

the

total

construction

cost

will

rise .Moreover

,if

the

cantilever

construction

method

is

chosen

,the

amount

of

provisional

anchorage

devices

will

increase

,which

will

also

arise

the

construction

difficulties .In

this

case

,

a

continuous

rigid

frame

bridge

is

preferable

with

its

large

span

capacity

and

its

convenience in the construction process where it requires no system conversion .

Normally a continuous rigid frame bridge is arranged symmetrically

。

However ,in some

cases such as an unfavorable topographic condition or a restricted navigation condition

，

an

unsymmetrical

arrangement

is

usually

selected

.Generally

，

there

are

two

kinds

of

unsymmetrical

continuous

rigid

frame

bridges

regardless

of

curved

ones

:the

one

with

unsymmetrical longitudinal spans ,and the one with piers having height differences .And in

the practical projects

，

there are those with both features mentioned above .

Under

load

action

an

unsymmetrical

continuous

rigid

frame

bridge

will

have

unsymmetrical

internal

forces

and

deformations

，

which

is

different

from

symmetrical

ones .Therefore

，

it

is

necessary

to

study

on

unsymmetrical

rigid

frame

bridge .Based

on

project of western region a very good application examples of asymmetric continuous rigid

frame

—

the

Yantou

River

Bridge

in

Sinan

county

in

Guizhou

province

，

an

analysis

on

unsymmetrical

continuous

rigid frame

bridge

is

carried

on with

the

help

of finite

element

program .Several aspects studied in this paper are as follows.

(1) Set up a finite element model of a continuous rigid frame bridge with unsymmetrical

longitudinal spans. Keep the three parameters of pier of one side

，

including the height, the

width in the longitudinal direction and the spacing of double thin- wall

，

and change those

three

parameters

of

the

other

side.

Then

compare

and

analyze

the

internal

force

and

deformation of piers under load action. By that, features of internal force and deformation

of continuous rigid frame bridge with both unsymmetrical spans and different pier heights

can be acquired.

(2)

Set

up

another

finite

element

model,

a

continuous

rigid

frame

bridge

with

symmetrical longitudinal spans. Keep the height of pier of one side, and change the height of

1

孟庆硕——专业英语

pier of the other side. Then compare and analyze the internal force and deformation of piers

under load action and try to find out the characteristics of internal force and deformation of

continuous rigid frame bridge with symmetrical spans but different pier heights.

(3)

By contrast and analysis of the layouts of tendons of an unsymmetrical rigid frame

bridge

(The

Yantou

River

Bridge)

and

a

symmetrical

rigid

frame

bridge

(The

Second

Wujiang River Bridge), draw some conclusions on their similarities and differences .Analyze

the

location

differences

of

mid-span

te

ndon’s

control

section

of

symmetrical

and

unsymmetrical

rigid

frame

bridge

and

find

out

the

variation

trends

of

mid-

span

tendon’s

control section of unsymmetrical rigid frame bridge.

桥梁大体积混凝土结构温度应力及其敏感性因素分析

20130308

With the rapidly expanding of our country transportation

，

the capacity of bridge design

and construction technology by leaps and bounds

，

lots of massive bridge concrete structures

have been made. But also many problems appear. One obvious problem is that as a result of

big-size

and

complexity

of

the

structure,

the

temperature

stress

surpasses

the

limits

frequently

，

the temperature cracks come along.

The temperature stress as well as the resultant stress cracks are the factors which must

been considered in the designing. In the new code for design of highway bridges and culverts

which

has

been further

stressed

，

it

tells

us

the factor

can not be

neglected

in

the

project.

Although engineers have become aware of this problem

，

and many specialists have also done

a lot of studies

，

but some problems are still there

，

we need do more still.

The

paper

pays

more

attention

to

the

analysis

suited

to

bridge

structure

for

the

difference between massive concrete bridge structure and the general structure.

Firstly the status of the research on the mass concrete and its related theory is simply

described in the paper

，

although not much

，

but it has layed the necessary theoretical basis.

In the Chapter IV

，

some research about the temperature stress of the massive concrete

structures and its related factors is done. In this paper

，

only a few key aspects of the analysis

have been studied

，

for example

，

the relationship between the rate of water flow and cooling

efficiency the depth effect of outside temperature

，

the effect of structure size on the stress

2