CN108756061A - A kind of partial precast assembly prestress steel reinforced concrete hybrid beam and construction method - Google Patents

A kind of partial precast assembly prestress steel reinforced concrete hybrid beam and construction method Download PDF

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Publication number
CN108756061A
CN108756061A CN201810629207.3A CN201810629207A CN108756061A CN 108756061 A CN108756061 A CN 108756061A CN 201810629207 A CN201810629207 A CN 201810629207A CN 108756061 A CN108756061 A CN 108756061A
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CN
China
Prior art keywords
shaped
concrete
prefabricated
steel
slot
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CN201810629207.3A
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Chinese (zh)
Inventor
杨勇
于云龙
薛亦聪
冯世强
孙东德
杨叶
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西安建筑科技大学
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Priority to CN201810629207.3A priority Critical patent/CN108756061A/en
Publication of CN108756061A publication Critical patent/CN108756061A/en

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete

Abstract

A kind of partial precast assembly prestress steel reinforced concrete hybrid beam is made of using the cast-in-place thought of partial precast assembled portion pre-erection and cast-in-place part, including prefabricated U-shaped high-strength concrete slot;It is set to shaped steel parallel with length direction in prefabricated U-shaped high-strength concrete slot;It is set to the prefabricated U-shaped high-strength concrete slot bottom vertical muscle one parallel with length direction;It is set to stirrup vertical with length direction in prefabricated U-shaped high-strength concrete slot;It is set to light core film in prefabricated U-shaped high-strength concrete slot and parallel with flute length direction;It is set to the prefabricated U-shaped high-strength concrete groove top vertical muscle two parallel with length direction;It is set to presstressed reinforcing steel parallel with length direction in prefabricated U-shaped high-strength concrete slot;The cast-in-place normal concrete one being filled in prefabricated U-shaped high-strength concrete slot;And it is set to the cast-in-place flange plate of prefabricated U-shaped high-strength concrete groove top, the present invention can mitigate the dead weight of beam, and simple bending end stress performance is good, save material, improve beam cracking resistance.

Description

A kind of partial precast assembly prestress steel reinforced concrete hybrid beam and construction method

Technical field

The invention belongs to technical field of buildings, more particularly to a kind of partial precast assembly prestress steel reinforced concrete mixing Beam.

Background technology

In modern reinforced concrete structure, the structure type applied in early days is monolithic reinforced concrete structure, it be Structure made of live formwork and one-piece casting has many advantages, such as that materials are easy, overall performance is good, rigidity is big, normability is good.But Also have the shortcomings that during design, construction and use it is very much, such as need to consider from great factor in the design process;Scene into There is working procedure various when row formwork is with construction, labo r usage is big, and the period is long, of high cost etc.;There is crack resistance poor during use The shortcomings of, positive impetus is lacked to establishing resource economizing type and friendly environment society.

With the development of building construction technology, prefabricated concrete structure occurs, and it is main stress that it, which is by prefabricated components, Component is through assembling or connecting the concrete structure of formation.Compared with cast-in-place concrete structure, industry may be implemented in fabricated construction Metaplasia is produced, and since component is poured and conserved in factory, the quality of component is ensured, the making of building element is not by season The influence and limitation of section, and the construction period is greatly shortened, production efficiency is high, has saved a large amount of support shuttering, has been conducive to Environmental protection, however, there are also many disadvantages, and overall performance is poor, and design difficulty is larger, impervious poor, unfavorable antidetonation, Transporting installation, there is also certain problems.

Invention content

In order to overcome the disadvantages of the above prior art, the purpose of the present invention is to provide a kind of partial precast assembly prestress Steel reinforced concrete hybrid beam, the advantages of remaining cast-in-place and fabricated construction, while solving the deficiency of two kinds of structures, have existing The characteristics of easy construction, of low cost, function admirable.

To achieve the goals above, the technical solution adopted by the present invention is:

A kind of partial precast assembly prestress steel reinforced concrete hybrid beam, which is characterized in that including:

Prefabricated U-shaped high-strength concrete slot 1;

The cast-in-place normal concrete 1 being filled in prefabricated U-shaped high-strength concrete slot 1;

It is set to the shaped steel 5 that in prefabricated U-shaped high-strength concrete slot 1 and length direction is parallel with flute length direction;

It is set to 1 slot bottom of prefabricated U-shaped high-strength concrete slot and several vertical muscle one 6 parallel with flute length direction;

It is set in prefabricated U-shaped high-strength concrete slot 1 and the stirrup 7 of several closures vertical with flute length direction;

It is set to 1 groove top of prefabricated U-shaped high-strength concrete slot and several vertical muscle two 8 parallel with flute length direction;

It is set to the light core film 9 that in prefabricated U-shaped high-strength concrete slot 1 and length direction is parallel with flute length direction, lightweight Core film 9 is closely set in the web side of shaped steel 5;

It is set to the presstressed reinforcing steel 10 that in prefabricated U-shaped high-strength concrete slot 1 and length direction is parallel with flute length direction;

And

It is set to the cast-in-place flange plate at 1 top of prefabricated U-shaped high-strength concrete slot.

The lower part of the I-steel 5 is located in the slot bottom of prefabricated U-shaped high-strength concrete slot 1, and presstressed reinforcing steel 10 is according to construction It is required that carrying out tensioning, the lower part of the closed stirrups 7 is located in the cell wall and slot bottom of prefabricated U-shaped high-strength concrete slot 1, indulges muscle one 6 bottoms for being located at the trench bottom of prefabricated U-shaped high-strength concrete slot 1 and being welded in 7 closed circle of stirrup, vertical muscle 28 are located at prefabricated U The top of type high-strength concrete slot 1 and the top being welded in 7 closed circle of stirrup, the prefabricated U-shaped high-strength concrete slot 1, type Steel 5, vertical muscle 1, stirrup 7, vertical muscle 28, light core film 9 and presstressed reinforcing steel 10 are pre-erection.

In the longitudinal direction, prefabricated U-shaped high-strength concrete slot 1 is stretched out at both ends to the shaped steel 5, the shaped steel 5 be H profile steel, I-steel or cellular steel.

The light core film 9 be polystyrene foam core film, polyphenyl inner membrance, inflating rubber core film or other light fire-proofs every Hot material.

The cast-in-place normal concrete 1 and cast-in-place flange plate are cast-in-place part.

Concrete strength used by the cast-in-place normal concrete 1 and cast-in-place flange plate is less than prefabricated high-strength concrete Concrete strength used by rectangular section 1.

Concrete used by the cast-in-place normal concrete 1 and cast-in-place flange plate is regeneration concrete, lightweight aggregate is mixed Solidifying soil, rubber concrete, sound absorption concrete or thermal-insulating concrete.

The cast-in-place flange plate uses composite slab with profiled steel sheeting or laminated floor slab.

The composite slab with profiled steel sheeting is by profiled sheet or precast slab 3 and cast-in-place normal concrete 24 Composition, wherein profiled sheet or precast slab 3 are connect with the top of prefabricated U-shaped high-strength concrete slot 1.

The present invention also provides the construction methods of the partial precast assembly prestress steel reinforced concrete hybrid beam, and step is such as Under:

1) in factory, vertical muscle 1 is welded on the bottom in the circle of stirrup 7, vertical muscle 28 is welded on the top in the circle of stirrup 7, By Lightweight core mould 9 be close to 5 web side of shaped steel and in specific position (simple bending section) it is fixed, presstressed reinforcing steel 10 according to construction requirement into Row tensioning pours the lower part of stirrup 7, vertical muscle 1 and shaped steel 5 and the lower part of presstressed reinforcing steel 10 in prefabricated U-shaped high-strength concrete In slot 1, pre-erection is completed;

2) at the scene, the both ends of shaped steel 5 and coupled column or steel column are directly connected to, or are connect with concrete column transition;

3) cast-in-place normal concrete 1 is poured into prefabricated U-shaped high-strength concrete slot 1;

4) cast-in-place flange plate is poured to 1 top of prefabricated U-shaped high-strength concrete slot.

Compared with prior art, the beneficial effects of the invention are as follows:

1) easy for construction.

The steel skeleton part of the prefabrication and assembly construction prestressed steel reinforced concrete hybrid beam includes that beam lower part is indulged muscle, stirrup, answered in advance Power muscle, shaped steel and lower part concrete, the part be prefabricated in the factory production complete, building site by the shaped steel of pre-erection with combine Column or steel column are directly connected to (or being connect with concrete column transition), then casting concrete floor completes installation.With traditional SRC beams It compares, scene does not have to assembling reinforcement, formwork, form removal and sets up temporary support under beam.If floor uses profiled sheet-coagulation local soil type Plywood or laminated floor slab are then not necessarily to formwork, form removal and set temporary support, on-site construction processes, construction in entire work progress Material and construction working hour will reduce, and construction efficiency will be improved.

2) weight reduction.

Certain Lightweight core mould is added in interlude in the middle part of shaped steel in the prefabricated U-shaped high-strength concrete slot, or uses honeycomb type Steel, after the completion of beam and concrete floor slab placement, compared with being not added with Lightweight core mould, to make the whole weight reduction of beam.And beam is by equal When cloth load action, under the premise of resist torque is substantially unaffected, certain Lightweight core mould is added in middle part, meets very much shearing span centre The big loading characteristic in small both ends.

3) cost is reduced.

In the construction of traditional SRC beams, beam pours together with floor, i.e., concrete is necessary for same in concrete and floor in beam One kind and same strength grade concrete.The larger girder with rolled steel section en cased in concrete of span mostly uses high-strength concrete.Floor is also the same Cost is caused to increase to make floor bar dosage increase using high-strength concrete.And the prefabrication and assembly construction prestressing force shaped steel coagulation Native hybrid beam only uses high-strength concrete in beam prefabricated part, and beam and the cast-in-place part of floor are mixed using normal concrete, regeneration Solidifying soil or lightweight aggregate concrete cause cost to reduce to which floor bar dosage is reduced.

3) functional promotion.

Concrete uses varying strength in concrete and floor in the prefabrication and assembly construction prestressed steel reinforced concrete hybrid beam beam The concrete of grade meets multi-functional requirement.To mitigate superstructure dead weight, using lightweight aggregate concrete;For improve superstructure vibration damping every Audio fruit, using rubber concrete or sound absorption concrete;To improve superstructure heat-insulating property, using thermal-insulating concrete.

4) construction quality is good.

In the construction of traditional SRC beams, working procedure is more, difficulty of construction is big, concrete vibrating in SRC beam webs often occurs The problems such as reinforcing bar misplaces in difference, Concrete intensity insufficient and beam, construction quality are not easy to control.And in the prefabrication and assembly construction prestressing force type In steel concrete hybrid beam, web part is mostly prefabrication, and concreting vibrates convenient and steam curing can be used, mixes Solidifying soil construction quality is easily controllable.

Generally speaking, compared with traditional SRC beams, which simplifies construction work Sequence and difficulty of construction efficiently solve some long-term crucial problems for restricting tradition SRC beams and promoting and applying, and can give full play to It is mixed to can be widely applied to all kinds of reinforcing bars in the advantage of stress performance, endurance quality, fire resistance and economic performance etc. for beam In solidifying soil and steel building, it is particularly suitable for large span, heavy load or complexity, irregular skyscraper and Super High and builds It builds.Therefore, prefabrication and assembly construction prestressed steel reinforced concrete hybrid beam is carried out and furthers investigate great practical meaning in engineering.

Description of the drawings

Fig. 1 is the stereoscopic schematic diagram of steel skeleton part of the present invention.

Fig. 2 is the stereoscopic schematic diagram of pre-erection of the present invention.

Fig. 3 is the stereoscopic schematic diagram of the cast-in-place part of the present invention.

Fig. 4 is the schematic cross-section that the present invention uses i shaped steel pre-erection.

Fig. 5 is A-A direction views in Fig. 4, i.e., the sectional view of Lightweight core mould in prefabricated U-shaped high-strength concrete slot.

Fig. 6 is B-B direction view in Fig. 4, i.e. prefabricated U-shaped high-strength concrete slot cross-section figure.

Fig. 7 is the schematic cross-section that the present invention uses the cast-in-place part of i shaped steel.

Fig. 8 is C-C direction views in Fig. 7, i.e., the sectional view of Lightweight core mould in prefabricated U-shaped high-strength concrete slot.

Fig. 9 is D-D direction views in Fig. 7, i.e. prefabricated U-shaped high-strength concrete slot cross-section figure.

Figure 10 is the schematic cross-section that the present invention uses honeycomb shaped steel pre-erection.

Figure 11 is E-E direction views in Figure 10, i.e., the sectional view of Lightweight core mould in prefabricated U-shaped high-strength concrete slot.

Figure 12 is F-F direction views in Figure 10, i.e. prefabricated U-shaped high-strength concrete slot cross-section figure.

Figure 13 is the schematic cross-section that the present invention uses the cast-in-place part of honeycomb shaped steel.

Figure 14 is G-G direction views in Figure 13, i.e., the sectional view of Lightweight core mould in prefabricated U-shaped high-strength concrete slot.

Figure 15 is H-H direction views in Figure 13, i.e. prefabricated U-shaped high-strength concrete slot cross-section figure.

Specific implementation mode

The embodiment that the present invention will be described in detail with reference to the accompanying drawings and examples.

A kind of partial precast assembly prestress steel reinforced concrete hybrid beam of the present invention, it is cast-in-place using partial precast assembled portion Thought, be made of pre-erection and cast-in-place part, as shown in Fig. 1 to Figure 15, including:

Prefabricated U-shaped high-strength concrete slot 1;It is set in prefabricated U-shaped high-strength concrete slot 1 and length direction and flute length direction Parallel shaped steel 5;It is set to 1 slot bottom of prefabricated U-shaped high-strength concrete slot and several vertical muscle one 6 parallel with flute length direction;Setting In prefabricated U-shaped high-strength concrete slot 1 and the stirrup 7 of several closures vertical with flute length direction;It is high-strength mixed to be set to prefabricated U-shaped 1 top of solidifying soil box and several vertical muscle two 8 parallel with flute length direction;It is set in prefabricated U-shaped high-strength concrete slot 1 and length side To the Lightweight core mould 9 parallel with flute length direction;It is set in prefabricated U-shaped high-strength concrete slot 1 and length direction and flute length direction Parallel presstressed reinforcing steel 10;The cast-in-place normal concrete 1 being filled in prefabricated U-shaped high-strength concrete slot 1;And it is set to pre- Make the cast-in-place flange plate at 1 top of U-shaped high-strength concrete slot.

Wherein, it as shown in Fig. 2, the lower part of shaped steel 5 is embedded in the slot bottom of prefabricated U-shaped high-strength concrete slot 1, indulges muscle 1 and welds It is connected on the bottom in the circle of stirrup 5, the lower part of stirrup 7 is embedded in the cell wall and slot bottom of prefabricated U-shaped high-strength concrete slot 1 and top Vacantly, it indulges muscle 28 and is welded on the circle inner top of 7 overhanging portion of stirrup and parallel with vertical muscle 1, presstressed reinforcing steel 10 is wanted according to construction Carry out tensioning, prefabricated U-shaped high-strength concrete slot 1 is asked shaped steel 5, vertical muscle 1, stirrup 7, to indulge muscle 28, Lightweight core mould 9 and answer in advance Power muscle 10 is pre-erection.

As shown in figure 3, cast-in-place normal concrete 1 and cast-in-place flange plate form cast-in-place part.Cast-in-place flange plate can be adopted With composite slab with profiled steel sheeting or laminated floor slab.With composite slab with profiled steel sheeting by profiled sheet in the present embodiment Or precast slab 3 and cast-in-place normal concrete 24 form, wherein profiled sheet or precast slab 3 and prefabricated U-shaped is high The top of reinforced concrete slot 1 connects.After cast-in-place, the top of shaped steel 5, the top of stirrup 7 and vertical muscle 28 are in cast-in-place part In.

Wherein:

1) concrete involved by pre-erection uses high-strength concrete, and the anti-of precast and assembled reinforced concrete beam can be improved Fragility energy, endurance quality and fire resistance.

2) in the longitudinal direction, prefabricated U-shaped high-strength concrete slot 1 is stretched out at both ends to shaped steel 5, i.e., in prefabricated type steel skeleton part Overhanging segment shaped steel is attached in construction and installation with the overhanging shaped steel bolt of pre- buried column, consequently facilitating prefabricated high-strength concrete Framework of steel reinforcement.

3) design parameters such as length, height, material involved by Lightweight core mould of the present invention can be counted according to corresponding design Calculation method and Specific construction case optimize.

4) H profile steel or I-steel may be used in shaped steel 5, and for there is pre-buried horizontal pipeline in requirement beam, it can be by H Shaped steel or I-steel change cellular steel into, and adjustment cellular steel cavity size is to meet the actual needs.

Concrete construction method is:

Be prefabricated in the factory the lower part web part of beam first, then in the lower part web part of building-site mounting rail, most The whole top edge of a wing plate part for pouring beam together with concrete floor afterwards.Whole shaped steel top flanges, top in beam prefabricated part are vertical Muscle and stirrup are exposed.The prefabricated web part in lower part of beam is the prefabricated U-shaped high-strength concrete with presstressed reinforcing steel and with light core film The high-strength concrete framework of steel reinforcement of slot (i.e. web);The cast-in-place edge of a wing plate part in top of beam can be armoured concrete slab, die mould The forms such as steel plate and concrete composite plate and precast concrete superimposed sheet, wherein cast-in-place concrete can be normal concrete, regeneration The different types concrete such as concrete, lightweight aggregate concrete.By various forms of prefabricated web parts and various forms of existing The intercombination of flange plate is poured, can be with optimum organization at various types of beams, and respectively have performance characteristics and an advantage, it is suitable for difference Project situation demand.

For the present invention on the basis of traditional square type precast beam, pre-erection uses I-steel, high-strength concrete and presstressed reinforcing steel It pours together, effectively improves pre-erection globality, meet on-site hoisting requirement, be a kind of good method for prefabricating.According to this Invention proposes design method, can advanced optimize honeycomb shape, I-steel type, and precast concrete inner surface lines is prefabricated The parameters such as part concrete strength, cast-in-place concrete intensity and type (regeneration concrete, lightweight aggregate concrete etc.) are with reality Now this example optimal designs.

Claims (10)

1. a kind of partial precast assembly prestress steel reinforced concrete hybrid beam, which is characterized in that including:
Prefabricated U-shaped high-strength concrete slot (1);
The cast-in-place normal concrete one (2) being filled in prefabricated U-shaped high-strength concrete slot (1);
It is set to the shaped steel (5) that in prefabricated U-shaped high-strength concrete slot (1) and length direction is parallel with flute length direction;
It is set to prefabricated U-shaped high-strength concrete slot (1) slot bottom and several vertical muscle one (6) parallel with flute length direction;
It is set in prefabricated U-shaped high-strength concrete slot (1) and the stirrup of several closures vertical with flute length direction (7);
It is set to prefabricated U-shaped high-strength concrete slot (1) groove top and several vertical muscle two (8) parallel with flute length direction;
It is set to the light core film (9) that in prefabricated U-shaped high-strength concrete slot (1) and length direction is parallel with flute length direction, lightweight Core film (9) is closely set in the web side of shaped steel (5);
It is set to the presstressed reinforcing steel (10) that in prefabricated U-shaped high-strength concrete slot (1) and length direction is parallel with flute length direction;
And
The cast-in-place flange plate being set at the top of prefabricated U-shaped high-strength concrete slot (1).
2. partial precast assembly prestress steel reinforced concrete hybrid beam according to claim 1, which is characterized in that the I-shaped The lower part of steel (5) is located in the slot bottom of prefabricated U-shaped high-strength concrete slot (1), and presstressed reinforcing steel (10) is opened according to construction requirement It draws, the lower part of the closed stirrups (7) is located in the cell wall and slot bottom of prefabricated U-shaped high-strength concrete slot (1), indulges one (6) position of muscle Trench bottom in prefabricated U-shaped high-strength concrete slot (1) and the bottom that is welded in stirrup (7) closed circle, indulge muscle two (8) be located at it is pre- The top made the top of U-shaped high-strength concrete slot (1) and be welded in stirrup (7) closed circle, the prefabricated U-shaped high-strength concrete Slot (1), shaped steel (5), vertical muscle one (6), stirrup (7), vertical muscle two (8), light core film (9) and presstressed reinforcing steel (10) are prefabricated Part.
3. partial precast assembly prestress steel reinforced concrete hybrid beam according to claim 1, which is characterized in that the shaped steel (5) in the longitudinal direction, prefabricated U-shaped high-strength concrete slot (1) is stretched out at both ends, and the shaped steel (5) is H profile steel, I-steel or bee Nest steel.
4. partial precast assembly prestress steel reinforced concrete hybrid beam according to claim 1, which is characterized in that the lightweight Core film (9) is polystyrene foam core film, polyphenyl inner membrance, inflating rubber core film or other light fire-proof heat-insulating materials.
5. partial precast assembly prestress steel reinforced concrete hybrid beam according to claim 1, which is characterized in that described cast-in-place Normal concrete one (2) and cast-in-place flange plate are cast-in-place part.
6. partial precast assembly prestress steel reinforced concrete hybrid beam according to claim 1, which is characterized in that described cast-in-place Concrete strength used by normal concrete one (2) and cast-in-place flange plate is less than prefabricated high-strength concrete rectangular section (1) institute The concrete strength of use.
7. partial precast assembly prestress steel reinforced concrete hybrid beam according to claim 1, which is characterized in that described cast-in-place Concrete used by normal concrete one (2) and cast-in-place flange plate is regeneration concrete, lightweight aggregate concrete, rubber coagulation Soil, sound absorption concrete or thermal-insulating concrete.
8. partial precast assembly prestress steel reinforced concrete hybrid beam according to claim 1, which is characterized in that described cast-in-place Flange plate uses composite slab with profiled steel sheeting or laminated floor slab.
9. partial precast assembly prestress steel reinforced concrete hybrid beam according to claim 8, which is characterized in that the die mould Steel plate and concrete composite plate is made of profiled sheet or precast slab (3) and cast-in-place normal concrete two (4), wherein pressing Shape steel plate or precast slab (3) are connect with the top of prefabricated U-shaped high-strength concrete slot (1).
10. the construction method of partial precast assembly prestress steel reinforced concrete hybrid beam, feature exist according to claim 1 In steps are as follows:
1) in factory, vertical muscle one (6) is welded on the bottom in stirrup (7) circle, vertical muscle two (8) is welded in stirrup (7) circle Lightweight core mould (9) is close to shaped steel (5) web side and fixed, presstressed reinforcing steel (10) root in specific position (simple bending section) by top Tensioning is carried out according to construction requirement, the lower part of stirrup (7), vertical muscle one (6) and shaped steel (5) and the lower part of presstressed reinforcing steel (10) are poured It builds in prefabricated U-shaped high-strength concrete slot (1), completes pre-erection;
2) both ends of shaped steel (5) are directly connected to coupled column or steel column at the scene, or are connect with concrete column transition;
3) cast-in-place normal concrete one (2) is poured into prefabricated U-shaped high-strength concrete slot (1);
4) cast-in-place flange plate is poured to prefabricated U-shaped high-strength concrete slot (1) top.
CN201810629207.3A 2018-06-19 2018-06-19 A kind of partial precast assembly prestress steel reinforced concrete hybrid beam and construction method CN108756061A (en)

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CN201810629207.3A CN108756061A (en) 2018-06-19 2018-06-19 A kind of partial precast assembly prestress steel reinforced concrete hybrid beam and construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810629207.3A CN108756061A (en) 2018-06-19 2018-06-19 A kind of partial precast assembly prestress steel reinforced concrete hybrid beam and construction method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109537807A (en) * 2018-11-21 2019-03-29 江南大学 A kind of partial precast shape steel-concrete combined beam
CN109537804A (en) * 2018-11-21 2019-03-29 江南大学 A kind of partial precast shape steel-concrete combined beam and its construction method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109537807A (en) * 2018-11-21 2019-03-29 江南大学 A kind of partial precast shape steel-concrete combined beam
CN109537804A (en) * 2018-11-21 2019-03-29 江南大学 A kind of partial precast shape steel-concrete combined beam and its construction method

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