CN110241724A - A kind of hogging moment area UHPC processing steel-mixes composite structure and preparation method - Google Patents
A kind of hogging moment area UHPC processing steel-mixes composite structure and preparation method Download PDFInfo
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- CN110241724A CN110241724A CN201910454074.5A CN201910454074A CN110241724A CN 110241724 A CN110241724 A CN 110241724A CN 201910454074 A CN201910454074 A CN 201910454074A CN 110241724 A CN110241724 A CN 110241724A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of hogging moment area UHPC processing steel-to mix composite structure and preparation method, mixes in steel-and uses UHPC floorings in the segmental length of composite structure hogging moment area, and welds the top flange of (bolt) adjacent girder steel at pier top.The continuous composite structure beam of freely-supported bridge floor is mixed for steel-, the present invention can significantly improve the cracking load of hogging moment area combination beam, and fracture interval is smaller, hence it is evident that inhibit the development of distress in concrete, excellent cracking resistance can effectively solve the problem of Cracking of hogging moment area.
Description
Technical field
The invention belongs to steel-to mix composite structure technical field, and in particular to a kind of mixed group of hogging moment area UHPC processing steel-
Close structure and preparation method.
Background technique
With highway in China and the continuous development of urban construction, steel-mixes composite beam bridge since span ability is big, building height
It is small, anti-seismic performance is good and constructs the advantages that fast, be widely used.Steel-mixes combination beam and has become municipal works, highway
Relatively common a kind of structure type in engineering, architectural engineering.Development with bridge to lightness and with large span direction,
Steel-, which mixes combination beam, also to be developed from freely supported structure to multispan continuous structure.But as " the mixed combination of steel-is continuous for the paper of Zheng He's brightness et al.
Negative moment section of beam floorings Crack Resistance " introduce in hogging moment area, top concrete slab tension, lower part girder steel are pressurized,
Concrete slab is easy to crack, the easy local buckling of steel girder, and combination beam rigidity is caused to reduce and durability decline.The mixed combination of ordinary steel-
Beam in order to control the cracking of hogging moment area concrete slab, often apply before concreting the prestressing force centainly born or
Directly in hogging moment area stretch-draw prestressing force steel beam, increase floorings compression deposit to prevent its cracking, or use the high ratio of reinforcement
To limit the fracture width of floorings.But for concrete slab, application prestressing force difficulty is larger, applies efficiency
It is low, and easily lose, paper " the prestressed concrete bridge panel construction delivered in " tech enterprises in China " such as Zhang Fangkun
Technology " describes in the construction of prestressed concrete bridge panel and is equipped with rigors to bellows, anchor plate, steel strand wires.
Ultra-high performance concrete, abbreviation UHPC, also referred to as Reactive Powder Concrete are after high-intensitive, high performance concrete
Successfully a kind of superhigh intensity, low brittleness, excellent in te pins of durability and the novel super-high strength with broad prospect of application mix for research later
Solidifying soil, compared with normal concrete, UHPC have high resistance to compression and flexural strength, superelevation it is impervious and good wear-resisting
Property, preferable ductility and higher tensile strength.About 10000 yuan of every cube of UHPC and about 1000 yuan of normal concrete, difference is huge
Greatly, therefore economic comparison is fairly obvious.
In recent years, the country has scholar to carry out a series of use high-performance concrete materials instead of the common coagulation in hogging moment area
The research of soil, some achievements of acquirement, such as Deng Shuwen paper " the complete prefabricated quick frame delivered in Chinese Highway journal in 2017
If the light-duty combined city bridge [J] of steel-UHPC " proposes a kind of Simply supported non-uniform structure that can be integral prefabricated with beam section to solve
The excessive problem of the mixed combination negative moment section of beam stress of traditional steel-；The paper delivered on civil engineering journal such as Li Wenguang et al.
" experimental study of steel-UHPC compoboard flexural property " has studied the lateral flexural property of the light-duty combined bridge deck system of steel-UHPC,
The tensile stress of 18MPa or more can be born under hogging moment effect, but vertical unit length UHPC dosage reaches in the technical solution
0.05m3/ m, high expensive；Have studied influence of the sectional reinforcement rate to steel-UHPC combined bridge deck cracking resistance.But it wherein grinds
Study carefully it is mostly be orthotropic steel bridge deck and the combination of UHPC, be not directed to the hogging moment area research that I-steel-mixes combination beam.I.e. pair
The Mid and minor spans beam bridge of 30~60m overcomes the problems, such as that the cracking of hogging moment area concrete slab does not have solution。
The urgent needs that vertical unit length UHPC dosage is this field are utmostly reduced while reaching cracking resistance.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of hogging moment area
UHPC handles steel-and mixes composite structure, can reduce vertical unit length UHPC dosage, novel in design reasonable, mixes group in steel-
Close in the segmental length of structure hogging moment area keeps bridge floor continuous using UHPC floorings, and (bolt is welded in the top flange of adjacent girder steel
Connect) further limitation crack emergence and development.UHPC can improve the cracking load of hogging moment area combination beam, act in hogging moment
Under, the cracking strength of steel-UHPC continuous composite beam mixes the cracking strength of combination beam much higher than ordinary steel-, and fracture interval is smaller,
The obvious development for inhibiting distress in concrete can effectively solve the problem of Cracking that steel-mixes bridge floor continuous composite beam hogging moment area.This hair
Another bright is designed to provide the preparation method that UHPC processing steel-in the hogging moment area mixes composite structure, keeps construction is simple easy
Operation.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of mixed composite structure of hogging moment area UHPC processing steel-, includes: in one section of across footpath L of every two sections bridge pier composition
The girder steel of erection, the girder steel are steel I-beam, and the bridge pier is that 30~60m is arranged by across footpath L, described on adjacent segment across footpath L
Girder steel top flange is bolted or is welded to connect using steel plate at the hogging moment area band on bridge pier, the steel plate and the girder steel upper limb
Edge upper surface uniform welding shearing nail, the hogging moment area band of the steel plate and the girder steel top flange on bridge pier cover one layer of company
Continuous normal concrete floorings, the normal concrete floorings form inner cavity in hogging moment area band, pour in inner cavity
There are UHPC floorings, the steel beam web plate is placed equidistant with girder steel ribbed stiffener along its length.
Further, the inner cavity across footpath L that along girder steel directional spreding length is 0.08~0.15 times；
The UHPC floorings laying depth is 140~160mm, and the normal concrete floorings laying depth is 110
~130mm.
The girder steel top flange 16~20mm of thickness, wide 400~500mm；High 1000~the 1800mm of web, 16~20mm of thickness；
Girder steel lower flange 20~36mm of thickness, wide 650~750mm.
The steel beam web plate is placed equidistant with girder steel ribbed stiffener along its length.
Further, the UHPC floorings by 7~10MPa of bending and tensile strength, 150~200MPa of compression strength it is super
High performance concrete is made.
Further, the girder steel uses Q345 steel.
By above structure, a kind of hogging moment area UHPC processing steel-mixes the preparation method of composite structure, comprising the following steps:
The girder steel set up in one section of across footpath L of every two sections bridge pier composition, the girder steel are steel I-beam, the hogging moment area on bridge pier
Steel plate 3 is used to bolt or weld the girder steel top flange in adjacent across footpath L with place, the bridge pier is 30~60m arrangement by across footpath L；
Then in steel plate and girder steel top flange upper surface welding shearing nail；
Continuous common coagulation is laid in such a way that steel plate and girder steel top flange upper surface are cast-in-place or prefabricated using template
Native floorings, and hogging moment area band of the normal concrete floorings on bridge pier is made to form inner cavity, it is adopted in the inner cavity
UHPC floorings are laid with cast-in-place mode；
UHPC processing steel-is obtained after natural curing mixes composite structure.
Design of the invention is as follows: use steel I-beam, first by girder steel respectively across interior freely-supported, at pier top by it is adjacent across
Girder steel top flange is using bolt or is welded together, then casting concrete or by prefabricated concrete bridge deck on it
Grillage is located on girder steel, floorings it is adjacent across pier top on be it is continuous, to guarantee that vehicle passes through.
Compared with the prior art, the present invention has the following advantages:
The method that the UHPC processing steel-that the present invention uses mixes composite structure hogging moment area is born curved in the mixed composite structure of steel-
Keep bridge floor continuous using UHPC floorings in square area across footpath segment length, and (bolt) is welded into the top flange of adjacent girder steel, into one
The emergence and development in step limitation crack.Ultra-high performance concrete (abbreviation UHPC) is current state-of-the-art cement base engineering material,
With superelevation resistance to compression, tension, endurance quality, compression strength up to 150~200MPa, tensile strength reach 7~10MPa with
On.UHPC can improve the cracking load of hogging moment area combination beam, under hogging moment effect, the cracking of steel-UHPC continuous composite beam
Intensity mixes the cracking strength of combination beam much higher than ordinary steel-, and fracture interval is smaller, hence it is evident that inhibit the development of distress in concrete,
It can effectively solve the problem of Cracking that steel-mixes continuous composite beam hogging moment area, convenient for promoting the use of.
The adjacent girder steel of different across footpath sections is welded at pier top or is bolted the globality with enhancing structure, the rigidity of structure
Increase, advantageously reduces the appearance in crack, and keep crack more dispersed.Girder steel and concrete slab are connected to one by WELDING STUDS
It rises, is formed whole with collective effect, rigidity of structure increase.
UHPC floorings of the invention, in hogging moment load, UHPC floorings maximum crack width is 0.05mm, at this time
Corresponding load is defined as the cracking load of composite structure, and cracking load measured value is 90.2kN, and the cracking of UHPC floorings is answered
Become 1453 μ ε, corresponding plate strain is 269 μ ε, and it is 30~60m that composite structure of the invention, which is applicable in across footpath,.
Jackshaft plate thickness of the present invention is about in 300mm or so.The present invention first spreads one layer of normal concrete floorings about 200mm
Thickness is laid with UHPC floorings on step, handles in this way, the strong UHPC floorings of cracking resistance can be arranged in topmost
To resist tensile stress, meet the force request of hogging moment area, while greatly reducing the dosage of UHPC, composite structure of the invention is vertical
It is 0.005~0.006m to length UHPC unit length dosage3/ m reduces by 10 times compared with the existing technology.Every cube of UHPC is about
10000 yuan and about 1000 yuan of normal concrete, difference is huge, therefore economic comparison is fairly obvious, and the present invention is more particularly suitable.This
The construction method of invention is not necessarily to UHPC floorings or normal concrete floorings arrangement of reinforcement, or in UHPC floorings and common coagulation
The joint surface of native floorings anchors U-shaped steel muscle in advance, overlaps on the normal concrete floorings U-shaped steel muscle of UHPC floorings mutually
It pours, construction method of the invention is simple and easy to do, reduces in the prior art in UHPC floorings and normal concrete floorings
The program of interior arrangement of reinforcement.
Below by attached drawing, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is that UHPC of the present invention handles the mixed composite structure hogging moment area schematic diagram of steel-；
Fig. 2 is girder steel cross-section diagram of the present invention；
Fig. 3 is that hogging moment area of the present invention bolts detail view；
Fig. 4 is that detail view is welded in hogging moment area of the present invention；
Fig. 5 is longitudinally arranged for test beam and load icon.
Fig. 6 is that test beam longitudinal direction corresponding measuring point arranges the diagram after displacement meter；
Fig. 7 is test beam longitudinal direction top view.
Description of symbols
1-normal concrete floorings；2-UHPC floorings；3-steel plates；
4-WELDING STUDSs；5-girder steels；6-girder steel ribbed stiffeners；
7-bridge piers；8-girder steel top flanges；9-steel beam web plates；
10-girder steel lower flanges；11-bolts；12-weld seams.
Specific embodiment
Ultra-high performance concrete (UHPC) as it is a kind of it is novel, one of there is inventive material, there is superelevation compression strength
(150~200MPa), superelevation compression strength (7~10MPa) and good endurance quality.UHPC can improve hogging moment area combination beam
Cracking load,Test cardBright, under hogging moment effect, the cracking strength of steel-UHPC continuous composite beam is mixed much higher than ordinary steel-
The cracking strength of combination beam, and fracture interval is smaller, hence it is evident that it is continuous to can effectively solve steel-mixed connection for the development for inhibiting distress in concrete
The problem of Cracking of negative moment section of beam is combined, convenient for promoting the use of.
Embodiment 1
Such as Fig. 1~4, process of deployment is as follows in the present embodiment:
Equidistant interval sets up girder steel 5 in one section of across footpath L of every two sections bridge pier 7 composition, and the girder steel 5 is steel I-beam,
The steel beam web plate 9 is placed equidistant with girder steel ribbed stiffener 6 along its length, and steel plate 3 is used at the hogging moment area band on bridge pier 7
The girder steel top flange 8 in adjacent across footpath L is bolted or welds, the bridge pier 7 is 30~60m arrangement by across footpath L；
Then in steel plate 3 and 8 upper surface of girder steel top flange welding shearing nail 4；
Continuous prefabricated normal concrete floorings 1 are laid in steel plate 3 and 8 upper surface of girder steel top flange, it is described
Hogging moment area band of the normal concrete floorings 1 on bridge pier 7 has inner cavity, is spread in the inner cavity using cast-in-place mode
If UHPC floorings 2；
UHPC processing steel-is obtained after natural curing mixes composite structure.
In composite structure manufactured in the present embodiment, floorings in the segmental length of composite structure hogging moment area are mixed in steel-and are used
UHPC material, and (bolt) is welded into the top flange of adjacent girder steel at pier top.The present embodiment be suitable for single span across footpath L be 30~
The mixed combination continuous beam of the steel-of 60m.Since current UHPC material construction is higher, under the premise of guaranteeing that structure stress is met the requirements,
Reduce UHPC dosage to the greatest extent, thus in the present embodiment hogging moment area ultra-high performance concrete floorings laying length be 0.08~
0.15L.Hogging moment area ultra-high performance concrete floorings are by 7~10MPa of bending and tensile strength, 150~200MPa of compression strength
Ultra-high performance concrete be made, Q345 steel is all made of using girder steel top flange 8 at steel I-beam 5 and 7 top of bridge pier across interior.Its
In, hogging moment area is laid in 0.08~0.15L length range of UHPC floorings 2, the ultra-high performance concrete UHPC bridge on upper layer
2 laying depth of panel is 140~160mm, and 1 laying depth of normal concrete floorings of lower layer is 110~130mm.On girder steel
The edge of a wing 8 thickness 16~20mm, wide 400~500mm；Steel beam web plate 9 is 1000~1800mm high, 16~24mm of thickness；Girder steel lower flange 10
Thickness 20~36mm, wide 650~750mm.
Taking specification is long 1500mm, the wide 750mm in lower flange, the steel I-beam of the wide 500m in top flange two, by the present embodiment
Composite structure prepare test specimen, UHPC floorings 2 length in hogging moment area is 120mm, thick 120mm, dosage 0.008.4m3, longitudinal
Unit length UHPC dosage 0.0056m3/ m, then standard test procedure is pressed, the basic mechanical performance of UHPC is tested, this test is set
Counted a kind of more unique corner loading method, i.e., at the both ends support of composite structure one spring of each placement, in spring
On loaded (see Fig. 5), guarantee stable structure and realize larger corner displacement, be control with spring fastening displacement at load(ing) point
Mode is loaded.Meanwhile to guarantee that two end support saddles of continuous beam are conllinear with intermediate 2 supports, in test beam production, lifting
During in place, total is fixed with fashioned iron, each height of support is adjusted when falling beam and is allowed in the same height, guarantees structure
Producing balanced forces.Test content includes the crack etc. of finder charge, longitudinal strain, vertical displacement and floorings, corresponding measuring point cloth
Displacement meter 12 is set, such as Fig. 6~7.UHPC layers of top surface fracture width are measured when to load convenient for hogging moment, using jack from upper past
Under be further applied load, as a result such as table 1.
Embodiment 2
Such as Fig. 1~5, process of deployment is as follows in the present embodiment:
Equidistant interval sets up girder steel 5 in one section of across footpath L of every two sections bridge pier 7 composition, and the girder steel 5 is steel I-beam,
Steel plate 3 is used to bolt or weld the girder steel top flange 8 in adjacent across footpath L, the bridge pier 7 at the hogging moment area band on bridge pier 7
It is 30~60m arrangement by across footpath L；
Then in steel plate 3 and 8 upper surface of girder steel top flange welding shearing nail 4；
Girder steel ribbed stiffener 6 is equidistantly welded and fixed along the steel beam web plate length direction, on steel plate 3 and girder steel top flange 8
Surface is laid with continuous normal concrete floorings 1 using template is cast-in-place, and the normal concrete floorings 1 are on bridge pier 7
Hogging moment area band there is inner cavity, UHPC floorings 2 are laid with using cast-in-place mode in the inner cavity；
UHPC processing steel-is obtained after natural curing mixes composite structure.
When UHPC processing steel-prepared by the method using the present embodiment mixes composite structure production combination beam, the same bridge
Girder steel ribbed stiffener 6 is equidistantly welded and fixed along 9 length direction of steel beam web plate in side by side parallel branch column steel I-beam 5 on pier 7,
Before the cast-in-place normal concrete floorings 1 built or mat formation prefabricated of template, template is cast-in-place between adjacent girder steel 5 arranged side by side is built
Normal concrete fills normal concrete to pouring height and 8 plane of girder steel top flange etc. between adjacent girder steel 5 arranged side by side
It is high.
The cracking that the method for mixing composite structure hogging moment area using UHPC processing steel-of the invention can be improved combination beam is strong
Degree, and fracture interval is smaller, hence it is evident that inhibit the development of distress in concrete；(welding) girder steel top flange is only bolted in hogging moment area,
It is easy to site operation.To sum up, which can effectively solve the problem that steel-mixes the problem of Cracking of bridge floor continuous composite beam hogging moment area, economical
Property it is good, convenient for promoting.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (5)
1. a kind of hogging moment area UHPC processing steel-mixes composite structure characterized by comprising the one of every two sections bridge pier composition
The girder steel set up in section across footpath L, the girder steel are steel I-beam, and the bridge pier is that 30~60m is arranged by across footpath L, adjacent segment across
On diameter L, the girder steel top flange is bolted or is welded to connect using steel plate at the hogging moment area band on bridge pier, the steel plate and institute
State girder steel top flange upper surface uniform welding shearing nail, the hogging moment area band of the steel plate and the girder steel top flange on bridge pier
One layer of continuous normal concrete floorings are covered, the normal concrete floorings form inner cavity in hogging moment area band, interior
UHPC floorings are poured in cavity, the steel beam web plate is placed equidistant with girder steel ribbed stiffener along its length.
2. hogging moment area UHPC processing steel-according to claim 1 mixes composite structure, it is characterised in that: the inner cavity
Along girder steel directional spreding the across footpath L that length is 0.08~0.15 times；
The UHPC floorings laying depth be 140~160mm, the normal concrete floorings laying depth be 110~
130mm；
The girder steel top flange 16~20mm of thickness, wide 400~500mm；High 1000~the 1800mm of web, 16~20mm of thickness；Girder steel
Lower flange 20~36mm of thickness, wide 650~750mm；
The steel beam web plate is placed equidistant with girder steel ribbed stiffener along its length.
3. hogging moment area UHPC processing steel-according to claim 1 mixes composite structure, it is characterised in that: the UHPC bridge
Panel is made of the ultra-high performance concrete of 7~10MPa of bending and tensile strength, 150~200MPa of compression strength.
4. hogging moment area UHPC processing steel-according to claim 1 mixes composite structure, it is characterised in that: the girder steel is adopted
With Q345 steel.
5. hogging moment area UHPC processing steel-according to any one of claims 1 to 4 mixes the preparation method of composite structure,
Be characterized in that, steps are as follows: the girder steel set up in one section of across footpath L of every two sections bridge pier composition, the girder steel are steel I-beam,
Bolt or weld girder steel top flange in adjacent across footpath L at hogging moment area band on bridge pier using steel plate, the bridge pier press across
Diameter L is 30~60m arrangement；
Then in steel plate and girder steel top flange upper surface welding shearing nail；
Continuous normal concrete bridge is laid in such a way that steel plate and girder steel top flange upper surface are cast-in-place or prefabricated using template
Panel, and hogging moment area band of the normal concrete floorings on bridge pier is made to form inner cavity, using existing in the inner cavity
The mode of pouring is laid with UHPC floorings；
UHPC processing steel-is obtained after natural curing mixes composite structure.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110629655A (en) * | 2019-10-09 | 2019-12-31 | 广西大学 | Local replaceable plate steel concrete composite beam adopting suspended formwork system |
| CN110924303A (en) * | 2019-11-19 | 2020-03-27 | 东北大学 | Steel beam and built-in steel reinforced concrete slab continuous combination beam and construction method |
| CN111076918A (en) * | 2020-01-09 | 2020-04-28 | 北京市轨道交通建设管理有限公司 | Device and method for testing bearing capacity of composite board structure |
| CN111778835A (en) * | 2020-07-01 | 2020-10-16 | 上海市城市建设设计研究总院（集团）有限公司 | Combined beam of steel, common concrete and ultrahigh-performance concrete and construction method |
| CN112482200A (en) * | 2020-12-24 | 2021-03-12 | 福州大学 | Connecting structure of hogging moment area of steel-concrete combined continuous beam and construction method thereof |
| CN112948921A (en) * | 2021-02-02 | 2021-06-11 | 中铁大桥勘测设计院集团有限公司 | Method for determining longitudinal constraint rigidity of tower beam of three-tower cable-stayed bridge and optimizing foundation |
| CN114703751A (en) * | 2022-02-17 | 2022-07-05 | 中铁上海工程局集团有限公司 | Simple construction process for improving hogging moment crack resistance of steel concrete composite beam |
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2019
- 2019-05-29 CN CN201910454074.5A patent/CN110241724A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110629655A (en) * | 2019-10-09 | 2019-12-31 | 广西大学 | Local replaceable plate steel concrete composite beam adopting suspended formwork system |
| CN110924303A (en) * | 2019-11-19 | 2020-03-27 | 东北大学 | Steel beam and built-in steel reinforced concrete slab continuous combination beam and construction method |
| CN110924303B (en) * | 2019-11-19 | 2021-08-10 | 东北大学 | Steel beam and built-in steel reinforced concrete slab continuous combination beam and construction method |
| CN111076918A (en) * | 2020-01-09 | 2020-04-28 | 北京市轨道交通建设管理有限公司 | Device and method for testing bearing capacity of composite board structure |
| CN111076918B (en) * | 2020-01-09 | 2022-07-05 | 北京市轨道交通建设管理有限公司 | Device and method for testing bearing capacity of composite board structure |
| CN111778835A (en) * | 2020-07-01 | 2020-10-16 | 上海市城市建设设计研究总院（集团）有限公司 | Combined beam of steel, common concrete and ultrahigh-performance concrete and construction method |
| CN112482200A (en) * | 2020-12-24 | 2021-03-12 | 福州大学 | Connecting structure of hogging moment area of steel-concrete combined continuous beam and construction method thereof |
| CN112948921A (en) * | 2021-02-02 | 2021-06-11 | 中铁大桥勘测设计院集团有限公司 | Method for determining longitudinal constraint rigidity of tower beam of three-tower cable-stayed bridge and optimizing foundation |
| CN114703751A (en) * | 2022-02-17 | 2022-07-05 | 中铁上海工程局集团有限公司 | Simple construction process for improving hogging moment crack resistance of steel concrete composite beam |
| CN114703751B (en) * | 2022-02-17 | 2023-09-12 | 中铁上海工程局集团有限公司 | Simple construction process for improving hogging moment crack resistance of steel concrete composite beam |
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