CN102505760B - Prefabricated combined beam and column node member - Google Patents
Prefabricated combined beam and column node member Download PDFInfo
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- CN102505760B CN102505760B CN2011103647768A CN201110364776A CN102505760B CN 102505760 B CN102505760 B CN 102505760B CN 2011103647768 A CN2011103647768 A CN 2011103647768A CN 201110364776 A CN201110364776 A CN 201110364776A CN 102505760 B CN102505760 B CN 102505760B
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Abstract
The invention relates to a prefabricated combined beam and column node member. The prefabricated combined beam and column node member comprises a cross beam and a vertical column which are intersected, wherein the cross beam as well as the vertical column comprises an ECC (engineered cementitious composite) material, longitudinal bars and stirrups, and a rectangular region where the cross beam and the vertical column are intersected and superposed is in the transverse width of A and the longitudinal height of B; the cross beam is in the transverse width of 2B plus A and the longitudinal height of B, and the longitudinal bars penetrate the full length of the cross beam and extend out of two beam ends by 10cm-15cm; and the vertical column in the longitudinal height of 2A plus B, and the longitudinal bars penetrate the full length of the vertical column and extend out of the two column ends by 10cm-15cm. The prefabricated combined beam and column node member disclosed by the invention is the prefabricated member which is formed by casting the steel bar-reinforced ECC material and is applied to an anti-seismic key part, in particular to a key node. Compared with an ordinary reinforced concrete member, the prefabricated combined beam and column node member can significantly improve the ductility and the anti-seismic performance of the structure, greatly reduce the use of the stirrups at the node under the condition of meeting the anti-seismic requirement and solve the difficult problem in construction caused by too dense stirrups in a node region.
Description
Technical field
What the present invention relates to is a kind of prefabricated beam column node component of fiber cement based composites (ECC) that adopts reinforcing bar to strengthen, and belongs to novel primary structure member, is mainly used in the high district that sets up defences of earthquake in order to substitute traditional cast-in-situ steel reinforced concrete node.
Background technology
ECC(engineered cementitious composites, engineering fiber cement based composites) be that a kind of to take cement and fine sand be filler, the novel concrete based composites that then adds synthetic fibers to form.The achievement in research of a large amount of physical and mechanical properties shows, the ECC material not only has the toughness of superelevation, and stronger energy absorption capability is arranged.And, to test verifiedly, the ultimate tensile strength value of this material is approximately 100～300 times of left and right of common concrete material, is 5～10 times of left and right of reinforcing bar, and its value can surpass 3%, and this provides new thinking for solving the concrete cracking problem.
The beam-column joints of frame construction and near zone will bear very large internal force under geological process, in Wenchuan earthquake, large amount of building is all to damage because of the destruction of beam column end plastic hinge or joint cores, and general structure (framework, shear wall structure etc.) in order to realize " strong column and weak beam ", aseismic design concept and the requirement of " strong shear capacity and weak bending capacity " and " strong node ", at concrete beam, post and bean column node place thereof have all configured fine and close stirrup, prevent the shear failure of beam column, but fine and close stirrup has brought great difficulty to site operation, easily cause node or key position concrete vibrating leakiness, bring potential safety hazard.
In addition, in the practice of construction process, between prefabricated node and adjacent members, reinforcing bar usually is connected with Type of Welding, due to end reinforced out-of-shape, two joints are difficult for alignment, and steel bar end lacks stable supporting and location during butt welding, causes the pad quality usually can't guarantee, becomes the weak spot of structure.
Summary of the invention
Technical problem: the invention provides and a kind ofly improve building structure especially mid-side node zone ductility and energy-dissipating property, thus the Prefabricated composite beam column node component that the implementation structure anti-seismic performance improves.
Technical scheme: a kind of Prefabricated composite beam column node component of the present invention, comprise the crossbeam and the column that intersect, described crossbeam and column form by fiber cement based composites, vertical muscle and stirrup for engineering, the transverse width of the rectangular area of crossbeam and column cross-coincidence is A, is vertically highly B;
The transverse width of described crossbeam is 2B+A, is vertically highly B, and described vertical muscle runs through the crossbeam total length and stretches out two beam-ends 10cm～15cm;
Vertical height of described column is 2A+B, and vertical muscle runs through the column total length and stretches out two styletable length 10cm～15cm.
In the present invention, the end of crossbeam and column all is fixed with angle bar, described angle bar and reinforcing bar welding, and the length that angle bar puts in crossbeam and column is 10～15cm, and the length that exceeds vertical muscle end is 10～15cm.
The present invention considers each regional loading characteristic of frame construction, in joint cores and near zone, uses the ECC material, designs the prefabricated bean column node of framework, and final and reinforcing bar forms the R/ECC combined member jointly.
Beneficial effect: the present invention compares and has the following advantages with existing cast-in-situ concrete beam column node:
1. the main position that joint cores and near zone are the geological process lower stress, mainly born the effect of absorption and dissipation seismic energy, after adopting the ECC material, piece table has revealed higher ductility and good energy-dissipating property, in the traditional reinforced concrete beam column mid-side node to having identical reinforcement ratio and R/ECC combination bean column node is tested relatively, every antidetonation index of the present invention all shows clear superiority, what Fig. 2 meaned is R/ECC combined joint and the skeleton curve of common RC node under low all cyclic loadings, the R/ECC combined joint has improved 20% than the ultimate bearing capacity of common RC node, during destruction, displacement improves 15%, can find out that by skeleton curve the R/ECC combined joint is after reaching the limit of load, supporting capacity does not descend rapidly, but longer descending branch is more stably arranged, this is because the ECC material has high tenacity, can suppress carrying out of crack, guarantee that node still has larger bearing capacity ability after surrender.
2. node is the main position that absorbs seismic energy in earthquake, so the energy-dissipating property of node will directly affect the anti-seismic performance of structure.What mean as Fig. 3 curve is when being subject to the earthquake cyclic load, the accumulation energy consuming ratio of two kinds of nodes, the seismic energy that the R/ECC combined joint absorbs under geological process is the several times of common RC node, has absolutely proved the characteristics of R/ECC combined joint high ductility, highly energy-consuming.
3. as Fig. 4, be the loop wire stiffness variation curves of two kinds of combined joints under geological process, the loop wire rigidity that the Stiffness Deterioration of experiment structure can be got under same one-level distortion means, adopt as seen from the figure the node rigidity of ECC material will obviously be better than the ordinary concrete node, and descend comparatively mild at the later stage of CYCLIC LOADING curve, this just illustrates the ECC material by restriction node crack and delays stiffness degradation and makes the strength degradation in node later stage also be lagged behind, allow node keep due bearing capacity under larger distortion, thereby improve the ductility of node.
4. experimental study shows, the steel concrete node has finally reached destruction of a node under low all cyclic loads, R/ECC node with same reinforcement ratio finally shows as beam-ends and destroys, and has reached earthquake resistant code desired " strong node " and beam-ends mode of failure.The R/ECC combined joint is in joint cores, than steel concrete node, stirrup still less just can meet the earthquake resistant code requirement in use, this has illustrated that the ECC material realized and the common shearing resistance of node stirrup in joint cores, be substituted the effect of stirrup on certain degree, used stirrup still less can effectively solve the overstocked construction difficult problem of node area stirrup.
5. in work progress, the pad quality between reinforcing bar usually can't guarantee, becomes the weak spot of structure.The present invention has welded angle iron in bar splice place of beam and column end, and reinforcing bar can be considered and rests on angle iron, and stability and fastness while so just having improved with adjacent steel bar butt welding have guaranteed rigidity and welding quality herein.
6. the bellows-shaped that the beam and column end section forms has increased contact area, will contribute in work progress the combination with adjacent members, avoids becoming stressed weakness zone herein.
7. prefabricated ECC node is as the key position of frame construction, with cast-in-place steel concrete node, compare, more easily controlled and assurance of quality in manufacturing process, while having solved cast-in-place Nodes construction, steel mesh reinforcement is intensive, the difficult problem that concreting is unreal, the node section good integrity.When mounted, with cast-in-situ concrete on every side, can well be connected again, jointly stressed.In addition, adopt this prefabricated units can save reinforcing bar and template, meet the development trend of energy-conserving and environment-protective.
8. because be subject to the bridge linking effect of fiber in the ECC material, structure is when hanging down under the class of loading effect, show as multiple cracking and carry out, and crack width is minimum, present fine and closely woven netted at node, major fracture does not appear all the time, after being applied in Practical Project, when the R/ECC combined joint, when being subject to hanging down the earthquake intensity geological process, the crack width of core space and near zone thereof will be significantly less than the ordinary reinforced concrete node, being almost naked eyes can not see, therefore after shake, without repairing, can continue to use.
9. the present invention has also expanded to the utilization of this material of ECC beam-ends and the styletable plastic hinge region of nearly core space, under geological process, these zones are subject to larger moment of flexure, at first crack is to occur herein, develop, it is final when certain major fracture extends to one fixed width, bearing capacity reduces rapidly, and component failure is destroyed.In this zone, the microcrack characteristics of carrying out of ECC material will be brought into play, and this will delay the major fracture time of occurrence, and member for prolonging, in the time than working under high-bearing capacity, improves ductility and the energy-dissipating property of structural entity.
10.ECC be flyash more than 70% in material, be mainly derived from the waste residue after the coal combustion of steam power station, therefore the ECC material is a kind of environmental friendliness shaped material thus, it builds the prefabricated component formed is also the twice laid to flyash, when guaranteeing the superior performance of member, reaches reusing natural resource.
The accompanying drawing explanation
Fig. 1 is sectional view of the present invention;
Fig. 2 is side sectional view of the present invention, and in figure, a is that angle bar puts in the length in crossbeam, and b runs through the length of after crossbeam, stretching out styletable for vertical muscle, and c is that angle bar exceeds the length of indulging muscle section;
The end cross-section that Fig. 3 is crossbeam of the present invention and column;
The skeleton curve comparison diagram that Fig. 4 is the present invention and ordinary reinforced concrete node;
The accumulative total energy consuming curve comparison diagram that Fig. 5 is the present invention and ordinary reinforced concrete node;
The loop wire stiffness curve comparison diagram that Fig. 6 is the present invention and ordinary reinforced concrete node.
In figure, have: crossbeam 1, column 2, vertical muscle 3, stirrup 4, angle bar 5.
The specific embodiment
Prefabricated composite beam column node component of the present invention, comprise the crossbeam 1 and the column 2 that intersect, and described crossbeam 1 and column 2 form by ECC material, vertical muscle 3 and stirrup 4, and crossbeam 1 is A with the transverse width of the rectangular area of column 2 cross-coincidences, is vertically highly B; The transverse width of crossbeam 1 is 2B+A, is vertically highly B, and described vertical muscle 3 runs through crossbeam 1 total length and stretches out two beam-ends 10cm～15cm; Vertical height of column 2 is 2A+B, and vertical muscle 3 runs through column 2 total lengths and stretches out two styletable length 10cm～15cm.
In the present invention, the end of crossbeam 1 and column 2 all is fixed with angle bar 5, described angle bar 5 and reinforcing bar 3 welding, and the length that angle bar 5 puts in crossbeam 1 and column 2 is 10～15cm, and the length that exceeds vertical muscle 3 ends is 10～15cm.
The preparation process of Prefabricated composite beam column node component of the present invention is:
1. determine the value size of A and B according to designing requirement, make mould, the good reinforcing bar of colligation, making reinforcing bar stretch out mould ends length is b, and then at end reinforced welding angle iron, it is a that angle iron gos deep into die length, and exceed steel bar end length is c.
2. insert corrugated sheet in mould middle cross beam and post end, and the length that makes angle iron pass corrugated sheet is b+c, then pours into the ECC material, and carefully vibrate, the final set corrugated sheet of later dismantling, maintenance can form prefabricated component after 28 days.
In the actual installation engineering of building operations, use the reinforcing bar connection between two Prefabricated composite beam column node components of the present invention, end at two Prefabricated composite beam column node components, all closely weld with reinforcing bar the termination of vertical muscle 3, the reinforcing bar stretched into also closely welds with angle bar simultaneously, then at the cast-in-place ordinary concrete of linkage section of two Prefabricated composite beam column node components, until moulding.
Claims (1)
1. a Prefabricated composite beam column node component, it is characterized in that, comprise the crossbeam (1) and the column (2) that intersect, described crossbeam (1) and column (2) are built composition by fiber cement based composites, vertical muscle (3) and stirrup (4) for engineering, crossbeam (1) is A with the transverse width of the rectangular area of column (2) cross-coincidence, is vertically highly B; The end cross-sectional of crossbeam (1) and column (2) is bellows-shaped;
The transverse width of described crossbeam (1) is 2B+A, is vertically highly B, and described vertical muscle (3) runs through crossbeam (1) total length and stretches out two beam-ends 10cm～15cm;
Vertical height of described column (2) is 2A+B, and vertical muscle (3) runs through column (2) total length and stretches out two styletable length 10cm～15cm;
The end of crossbeam (1) and column (2) all is fixed with angle bar (5), described angle bar (5) and reinforcing bar (3) welding, the length that angle bar (5) puts in crossbeam (1) and column (2) is 10～15cm, and the length that exceeds vertical muscle (3) end is 10～15cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103647768A CN102505760B (en) | 2011-11-17 | 2011-11-17 | Prefabricated combined beam and column node member |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103647768A CN102505760B (en) | 2011-11-17 | 2011-11-17 | Prefabricated combined beam and column node member |
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| CN102505760A CN102505760A (en) | 2012-06-20 |
| CN102505760B true CN102505760B (en) | 2013-12-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234209A (en) * | 2014-05-16 | 2014-12-24 | 山东万斯达建筑工业化研究院有限公司 | Construction method of beam-column joint |
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| CN102704621A (en) * | 2012-06-25 | 2012-10-03 | 中国十七冶集团有限公司 | Integral assembled frame precast beam |
| CN103774755A (en) * | 2014-01-07 | 2014-05-07 | 同济大学 | Prestressed prefabricated ECC-RC combination beam column joint component |
| CN103774754A (en) * | 2014-01-07 | 2014-05-07 | 同济大学 | Prefabricated ECC-RC combination beam column joint component |
| CN104532952A (en) * | 2014-12-19 | 2015-04-22 | 东南大学 | Short angle iron connection type reinforced concrete assembling integrated frame and construction method thereof |
| CN110056087A (en) * | 2019-06-03 | 2019-07-26 | 福州大学 | SMA-ECC self-healing assembling frame node structure and construction method |
| CN110080388A (en) * | 2019-06-06 | 2019-08-02 | 福建工程学院 | A kind of connection structure and its construction method improving PC frame joint anti-seismic performance |
| CN110468961A (en) * | 2019-08-29 | 2019-11-19 | 哈尔滨工业大学 | A kind of postposition in the built-in corrugated steel pipe of prefabricated beam column indulges the assembly concrete frame structure and preparation method thereof of muscle |
| CN113914694B (en) * | 2021-10-25 | 2023-06-16 | 江西中煤建设集团有限公司 | Assembled concrete beam column node and construction method thereof |
| CN115262633A (en) * | 2022-08-15 | 2022-11-01 | 上海建工集团股份有限公司 | Toughening device for existing underground space structure and construction method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11152796A (en) * | 1997-11-19 | 1999-06-08 | Kobe Steel Ltd | Method for jointing column and beam in lamination construction of steel-framed reinforced concrete and column-beam jointing structure |
| CN2390933Y (en) * | 1999-06-04 | 2000-08-09 | 同济大学 | Square steel pipe concrete beam and column jointing gusset |
| CN101029503A (en) * | 2007-04-06 | 2007-09-05 | 北京工业大学 | Beam and pile assembled node of precast and prestressed concrete structure |
| CN201474095U (en) * | 2009-09-08 | 2010-05-19 | 中国建筑第八工程局有限公司 | Combined connection device of reverse construction concrete beam steel bar and positive construction type steel column |
| CN202017302U (en) * | 2011-04-14 | 2011-10-26 | 西安建筑科技大学 | Engineering fiber reinforced cementitious composites (ECC) connecting beam |
| CN202359663U (en) * | 2011-11-17 | 2012-08-01 | 东南大学 | Pre-fabricated composite joint member |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104234209A (en) * | 2014-05-16 | 2014-12-24 | 山东万斯达建筑工业化研究院有限公司 | Construction method of beam-column joint |
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