What is the main structure of the superstructure of a highway simply supported girder bridge?

The superstructure of a simply supported bridge should include: bearings (basin rubber bearings, spherical steel bearings, ball-hinged seismic bearings), beams and slabs (prefabricated, cast-in-place, hollow, solid, prestressed), bridge deck structure (bridge deck pavement layer, waterproof layer, asphalt layer, bridge deck continuous, expansion joints, etc.), bridge deck ancillary structures (crash walls, isolation piers, sound insulation screens, etc.).

Simply supported beam is a statically determined structure, adjacent each span is stressed separately, the structural stress is relatively simple, is not affected by the bearing displacement and the like, is suitable for various geological conditions, the structure is also relatively simple, easy to make standardization, assembly components, manufacturing, installation are more convenient, is a kind of beam type bridge that adopts the most extensively. But the mid-span bending moment of simply supported beam will increase sharply with the increase of span diameter, thus the time of large span is not economical.

The superstructure is composed of the main load-bearing beams that are simply supported on the pier at both ends.

The superstructure structure, also known as the bridge span structure, is the main load-bearing structure that crosses obstacles when the route is interrupted; The substructure includes piers, abutments.

and foundations; Bridge ancillary facilities include bridge deck system and expansion joints.

The bridge deck includes bridge deck pavement (or carriageway pavement), drainage system, railing (or anti-collision railing), lighting, etc.

The problem of the little rabbit Turtle comes, hehe The superstructure of the simply supported bridge should include the following things: bearings (basin rubber bearings, spherical steel bearings, ball hinged seismic bearings), beams and slabs (prefabricated, cast-in-place, hollow, solid, prestressed), bridge deck structure (bridge deck pavement layer, waterproof layer, asphalt layer, bridge deck continuous, expansion joints, etc.), bridge deck ancillary structures (crash walls, isolation piers, sound insulation screens, etc.). That's all you know, hehe, you should have most of it.

The superstructure is composed of the main load-bearing beams that are simply supported on the pier at both ends.

The superstructure structure, also known as the bridge span structure, is the main load-bearing structure that crosses obstacles when the route is interrupted; The substructure comprises piers, abutments, and foundations; The ancillary facilities of the bridge include the bridge deck system, expansion joints, bridge head lap plate and tapered slope protection, etc., and the bridge deck system includes bridge deck pavement (or carriageway pavement), drainage system, railing (or anti-collision railing), lighting, etc.

Answer]: B2020 edition of Changhail Selling Textbook P103

The composition of the bridge is composed of four basic parts: the superstructure, the substructure, the bearing system and the ancillary facilities. The substructure comprises piers, abutments, and foundations;

The bridge is mainly composed of 3 parts: the substructure, the superstructure and the auxiliary structure, 1. The substructure:

The first is the foundation, including the pier foundation and the abutment foundation, and the foundation form generally has two types: expanded foundation and pile foundation.

The abutment is generally divided into gravity and light abutments (including ribbed abutments, pile abutments, etc.), and the general construction sequence is:

Gravity type: abutment foundation - front and side walls - cap - supporting pad stone.

Light abutment: pile foundation - bearing cap - platform body - cap, ear back wall - support stepping stone.

Bridge piers are slightly different according to their different types, and for pile-type piers directly connected to pile foundation conditions (i.e., no bearing cap), its construction sequence is generally: pile foundation - pile tie beam (if pier is not high may not be) - pier body - pier tie beam (if pier is not high may not be) - cover beam - support stepping stone.

In the case of cushion cap, pile foundation - cushion cap - pier body - cap beam - supporting pad stone.

2. a superstructure.

It varies according to the construction method

Prefabricated components: (if there is a reflection of the conversion, that is, the first simple support and then the continuous situation of the structure) Erection of prefabricated beams - cast-in-place pier top continuous section - tension negative moment prestressed cable - set permanent support, remove temporary support, complete system conversion - diaphragm, wet joints, etc.

In the case of simply supported structures, only prefabricated beams need to be erected.

Cast-in-place components: It has a great relationship with the scale of the bridge and the construction technology (full bracket cast-in-place, hanging blue construction, jacking method construction, etc.), and can generally be summarized as (post-tensioning method): erecting scaffolding (corresponding changes according to different construction technology) - binding reinforcement cage - cast-in-place concrete - tensile prestress - diaphragm, wet joints, etc.

3. Subsidiary structure.

Including bridge deck system, lap plate, guardrail, expansion joint, etc.

Bridge deck continuity - bridge deck pavement - sidewalk slab (if there is a sidewalk) - bridge deck drainage - guardrail - expansion joints, abutment slabs.

Tie beam: divide pier tie beam and pile tie beam, mainly in the middle of the pier or pile top, connect adjacent pier piles, enhance integrity.

Cap beam: It is divided into pier cover beam and abutment cover or accompanying beam, which is at the top of the pier abutment and plays the role of shelving the main beam.

Box girder: a kind of beam bridge structure form, there are box girder, T beam, hollow slab, etc., box girder can be divided into prefabricated box girder according to different standards.

and cast-in-situ box girders, equal-section box girders and variable-section box girders, small box girders and box girders, etc.

Abutment: Displacement of both ends of the bridge, which is connected to the road.

Abutment: Refers to the piers and abutments of the bridge.

Table cap and pier cap: the same meaning as the abutment cover beam and pier cover beam, but the name is different.

1. The stress characteristics of simply supported girder bridges.

2. Analysis of the mechanical characteristics of simply supported girder bridges.

3. The stress characteristics of simply supported beam bridges and continuous beam bridges.

4. Mechanical characteristics of simply supported girder bridges.

1.The structure of the bridge is statically determined, with no redundant constraints, and the displacement of the support seat has no effect on the internal force of the structure.

2.The support reaction force is only a vertical force, not a horizontal force.

3.The mid-span bending moment of the silver structure under the action of the uniform load of the sail.

Maximum, the deflection curve is parabolic.

Form. 4.Shear force at the support.

Maximum, the bending moment is zero.

1. Span determination : because the maximum span of the hollow core slab can only be 25 meters, if the span is greater than 25 meters, the hollow core slab will be abandoned;

2. Determined by industry habits: the railway department likes the T-beam, and the highway department likes the small box girder and hollow slab;

3. Determined by the on-site construction site: if the site can build a bracket, the highway department will choose a small box girder;

4. Determined by the equipment: if there is a large bridge erecting machine, T beam or small box girder will be selected;

5. Determined by the degree of technical maturity: because a certain type of professional construction team is more cherished, the design unit will be mobilized to design what type;

6. Determined by the type of the adjacent bridge: if there is a ready-made prefabricated yard and equipment for the type of the adjacent bridge, it will be considered in the design to save investment.

Now there are generally three types of box girders, T-beams and hollow slabs.

Simply supported beams: The two ends of the beam resting on the support.