Bridge Intermediate Support Design

Contents

1.Development of options.........................................................................................................................................................................................................................................................................................................................................................................................................................................

1.1. First variant.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... -

1.2. Second variant.................................................................................................................................................................................................................................................................................................................................................................

1.3. Option 3.................................................................................................................................................................................................................................................................................................................................................................

2. Collection of loads on the support base.......................................................................... -str

2.1. Structural dead weight.........................................................................................................................................................................................................................................................................................................................................................................................

2.2. Temporary movable loads.....................................................................................................................................................................

2.3. Horizontal transverse load from centrifugal force............ -str

2.4. Load from horizontal cross impacts

Rolling stock................................................................................................................................................................................. - p

2.5. Horizontal longitudinal braking load............................... -str

2.6. Wind load.................................................................................................................................................................................................................................................................................................................................

2.7. Load from moving ice fields.....................................................................................................................................................................................................

3. Calculation of pile foundation of support.....................................................................................................................................................................................................................................................................................................................................................................

3.1. Load options and load combinations.....................................................................................................................................................................................................................................................................................................................................................

3 2. Construction of the pile pile. Pile type selection.................................................................................................................

3.3. Determination of bearing capacity of pile foundation,

as massive in soil.....................................................................................................................................................................................................................................................................

3.4. Determination of support settlement.................................................................................. -str

4. Strength support calculation.....................................................................................................................................................................................................................................................................................................................................................................................

5. Calculation of support by shape stability.................................................................................................................................................................................................................

6. Crack Resistance Support Calculation.........................................................................................................................................................................................................................................................................................................

7. List of used literature.........................................................................................................................................................................................................................................................................................................................................................................................................

1. Developing options

Option 1: Combined support with hollow superstructure.

A feature is the device of the lower part of the massive, and the upper - lightweight view. The hollow superstructure is made of monolithic reinforced concrete. Support has solid body in zone of variable water level. Base part of support is similar to prefabricated supports. Two boxes are provided in cross section. They are mounted on support parts. The columns are coaxial to the boxes, the distance between them is 5.6m. The river is navigable (class 5), the thickness of the ice is 0.4m, the massive part of the support is made with roundings. The length of the crossbar is 10.6m with cantilever parts of 1.0 m, tears are present. Height of support is 13.5m.

I accept a pile foundation with a low pedestal. Dimensions of the pedestal 11.6x6.0x3.0 m. Under the base, reinforced concrete piles of continuous cross section 40x40 cm are used. They are located in 4 rows along the facade of 8 pcs. In each row, length 11.8m.

Option 2: Combined support with columns

The support is riggless. Two boxes are provided in cross section. They are mounted on support parts. The diameter of the columns is 2m, the height is 6.2m. The columns are coaxial to the boxes, the distance between them is 5.6m. Since the river is navigable (class 5), and the ice thickness is 0.4 m, the massive part of the support is made with roundings, a radius equal to half the width - 2.2 m. Height of support 12.87 m.

A pile foundation with a low pedestal is assigned to the support. Dimensions of the pedestal 11.0x5.4x2.0 m. Under the base, reinforced concrete piles of continuous cross section 40x40 cm are used. They are located in 4 rows along the facade of 8 pcs in each row.

Option 3: Massive prefabricated support

The support is riggless, with a head. The head plays the role of a roof, it is densely reinforced with nets and is a load distributor.

The support body consists of concrete blocks up to 3 m high and weighing up to 30 tons. Blocks are laid on the solution. Special niches are provided in the body of the blocks, which, after welding vertical outlets from the lower blocks with a reinforcement grid of the upper ones, are sealed with monolithic concrete.

Since the height of the support is quite large 12 m (from the top of the foundation to the top of the tip), it has inclined faces with a slope of 30:1 .

A pile foundation with a low pedestal is designed for the support. Dimensions of the pedestal 9.2x4.0x2.0 m. Under the base, reinforced concrete piles of continuous cross section 40x40 cm are used. They are located in 3 rows along the facade of 6 pcs in each row.

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