CN107908822A - The design method of prefabricated doubly-linked beam in a kind of overall assembled shear wall building structure - Google Patents

The design method of prefabricated doubly-linked beam in a kind of overall assembled shear wall building structure Download PDF

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CN107908822A
CN107908822A CN201710981864.XA CN201710981864A CN107908822A CN 107908822 A CN107908822 A CN 107908822A CN 201710981864 A CN201710981864 A CN 201710981864A CN 107908822 A CN107908822 A CN 107908822A
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doubly
prefabricated
linked
coupling beam
reinforcement
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CN107908822B (en
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焦柯
吴桂广
赖鸿立
毛建喜
王文波
陈剑佳
蒋运林
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Architectural Design and Research Institute of Guangdong Province
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    • G06F30/13Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material

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Abstract

The invention discloses a kind of design method of prefabricated doubly-linked beam in overall assembled shear wall building structure, including establish single coupling beam analysis model;Cast-in-place coupling beam and prefabricated doubly-linked beam are distinguished, the prefabricated doubly-linked beam has upper coupling beam, lower coupling beam and the cast-in-place join domain being connected with upper coupling beam and lower coupling beam end, which is connected with the wall of shear wall;The bending stiffness reduction coefficient of prefabricated doubly-linked beam is set;Obtained prefabricated doubly-linked beam is substituted into single coupling beam analysis model, single coupling beam of corresponding position is replaced as doubly-linked beam, obtains doubly-linked beam computation model, structure Design and Calculation is carried out to doubly-linked beam computation model, obtain prefabricated doubly-linked beam structure and arrangement of reinforcement as a result, the area of reinforcement of prefabricated doubly-linked beam is calculated;With reference to the area of reinforcement of obtained prefabricated doubly-linked beam and the construction of prefabricated doubly-linked beam, the actual arrangement of reinforcement of prefabricated doubly-linked beam is chosen;According to the structure of prefabricated doubly-linked beam and actual arrangement of reinforcement, construction drawing is drawn, completes the design of prefabricated doubly-linked beam.

Description

The design method of prefabricated doubly-linked beam in a kind of overall assembled shear wall building structure
Technical field
The present invention relates to a kind of design method of building structure, in particular to a kind of overall assembled shear wall building knot The design method of prefabricated doubly-linked beam in structure.
Background technology
Assembly of shear wall structure is made of a series of longitudinally, laterally shear walls and superstructure, for bearing vertical load It is common structure type in skyscraper with the space structure of horizontal loading.The steel reinforced concrete shearing force structure of rational design Anti-lateral displacement and torsional rigidity it is big, under horizontal loads, lateral displacement is smaller, has good antidetonation and wind resistance. The feature of shear wall structure lateral deformation under horizontal loads is flexure type, i.e. the stratified deformation of substructure is smaller, more It is bigger toward top stratified deformation.Fabricated shear wall is entirety of the rigidity to structure of partition wall with cast-in-place shear wall difference Stiffness contribution, the common structure of partition wall form of fabricated shear wall whether there is parting partition wall, bottom transverse joint partition wall, bottom transverse joint+side perps Partition wall, and different structure of partition wall forms contributes difference to the overall stiffness of structure, wherein integrally firm to structure without parting partition wall Degree contribution is maximum, and bottom transverse joint+side perps partition wall contributes structure overall stiffness minimum.
Under normal working load and wind action, structure should be in elastic state, and coupling beam should not produce Raw plastic hinge.And under small shake effect, coupling beam allows crack occur, but bearing capacity is met the requirements, and coupling beam permits under middle shake effect Permitted bending resistance surrender occur, but shearing resistance is unyielding, and under big shake effect, coupling beam allows to destroy, but needs certain prolong Property, belong to ductile fracture.Under normal circumstances, the span-depth radio of coupling beam is smaller, then the Line stiffness of coupling beam is bigger, the internal force of coupling beam and Arrangement of reinforcement also can be bigger, and the arrangement of reinforcement for be easy to causeing coupling beam has exceeded the maximum ratio of reinforcement of specification, or cross-section of coupling beam checking computations are unsatisfactory for It is required that so as to cause coupling beam brittle break occur when destroying, due to brittle break before destruction without obvious deformation or other pre- Million, harm is larger, is the failure mode that designer needs to avoid.Therefore how to ensure that coupling beam has higher energy dissipation capacity, with And preferable ductility, it is the major issue for having to consider in structure-property design.
The design of Tall Shear Wall Structures anti-seismic performanceization is carried out using prefabricated energy consumption Design of Connecting Beam method, can effectively be subtracted Small coupling beam internal force and arrangement of reinforcement, and since prefabricated energy consumption coupling beam has preferable ductility, make overall structure that there is energy consumption well Ability, reduces response of the structure under geological process, so as to improve the anti-seismic performance of structure, it is enough to ensure that structure has Security.
The content of the invention
The object of the present invention is to provide a kind of design side of prefabricated doubly-linked beam in overall assembled shear wall building structure Method, the design method are firm by reducing coupling beam rigidity and structure suitable for the larger situation of structure overall stiffness and coupling beam rigidity Degree, so as to reduce the seismic force of structure, and then saves the material utilization amount of structure.
What the above-mentioned purpose of the present invention was realized by following technical solution:A kind of overall assembled shear wall building knot The design method of prefabricated doubly-linked beam in structure, it is characterised in that this method comprises the following steps:
Step (1):Single coupling beam analysis model in overall assembled shear wall building structure is established, according to building structure Facade and plane, which are split, to be required, and using existing finite element method, structure design meter is carried out to single coupling beam analysis model Calculate, determine depth of beam and beam length, coupling beam is defined as to beam of the span-depth radio less than 5;
Step (2):The coupling beam determined according to step (1), by the analysis to coupling beam position, further discriminates between cast-in-place company Beam and prefabricated doubly-linked beam, wherein, the coupling beam of Lift & Stairs position is cast-in-place coupling beam, and the coupling beam of other positions is prefabricated doubly-linked Beam, the prefabricated doubly-linked beam have upper coupling beam, lower coupling beam and the cast-in-place bonding pad being connected with upper coupling beam and lower coupling beam end Domain, the cast-in-place join domain are connected with the wall of shear wall;
Step (3):The prefabricated doubly-linked beam determined according to step (2), sets the bending stiffness reduction system of prefabricated doubly-linked beam Number, the bending stiffness reduction coefficient of single coupling beam is η in rounding body fabricated shear wall building structure, then prefabricated doubly-linked beam is anti- Curved Stiffness degradation coefficient is 0.76 η;
Step (4):The prefabricated doubly-linked beam that step (3) is obtained is substituted into single coupling beam analysis model of step (1), will be right The single coupling beam that should locate is replaced as doubly-linked beam, doubly-linked beam computation model is obtained, using existing finite element method, to doubly-linked Beam computation model carry out structure Design and Calculation, obtain the structure of prefabricated doubly-linked beam, and obtain the arrangement of reinforcement of prefabricated doubly-linked beam as a result, The area of reinforcement As of prefabricated doubly-linked beam is calculated by arrangement of reinforcement result;
Step (5):The structure that prefabricated doubly-linked beam is calculated by step (4) is as follows:The total high H of prefabricated doubly-linked Liang, lower company Deck-molding is h1, and the slit width between upper coupling beam, lower coupling beam is h2, and the height of the upper cast-in-place part of coupling beam is hb, upper coupling beam pre-erection Height be h3, h3=H-h1-h2-hb;Upper coupling beam, the end of lower coupling beam pre-erection are by the cast-in-place join domain phase Hold together, the length of the cast-in-place join domain is 100mm, and the longitudinal tensile reinforcing bar of prefabricated doubly-linked beam stretches into shear wall Interior anchorage length is not less than 1.2La, and wherein La is the anchorage length of longitudinal tensile reinforcing bar;
Step (6):Obtained with reference to the area of reinforcement As and step (5) of the prefabricated doubly-linked beam that step (4) obtains prefabricated double The construction of coupling beam, chooses the actual arrangement of reinforcement of prefabricated doubly-linked beam, real to be not less than As with area of reinforcement A, and is not more than 1.05As;
Step (7):The actual arrangement of reinforcement that the structure and step (6) of the prefabricated doubly-linked beam obtained according to step (5) obtain, Construction drawing is drawn, completes the design of prefabricated doubly-linked beam in overall assembled shear wall building structure.
In the present invention, in the step (3), η values are 0.7.
In the step (5), H >=400mm, h1 240mm, h2 10mm, hb 140mm.
In order to make structure have certain ductility, coupling beam failure mode should be bending failure, and equivalent connecting beam ensures that bending resistance is firm first Degree is consistent.This section fundamental formular equivalent to more coupling beam bending resistances derives, and obtains final coupling beam bending stiffness reduction system Number.
If coupling beam a height of h, deck-siding b, beam Dan Gangwei K, transformation matrix T, it is assumed that beam central axes offset distance is dk.
The axial rigidity of bar,
The bending stiffness of bar,
Rigidity after offset, K'=TTKT (4)
Bending stiffness after offset,
Rotary inertia after offset,
If the radical of more coupling beams is n, every coupling beam rotary inertia is J1 in more coupling beams, and more coupling beam rotary inertias are Jn, Then:
Rotary inertia reduction coefficient,
When n=2 is prefabricated doubly-linked beam, γ 2=0.4375;When n=3 is three coupling beams, γ 3=0.3333.Bending stiffness with Deck-molding is 3 power relations, therefore equivalent connecting beam highly should be 0.76 times of prefabricated doubly-linked depth of beam, i.e.,
By bending stiffness Equivalent Calculation coupling beam, a reduction bending stiffness is answered, should not directly change depth of beam, it is otherwise equivalent Coupling beam is cut area and is cut area less than prefabricated doubly-linked beam;When carrying out prefabricated doubly-linked beam arrangement of reinforcement, if coupling beam reinforcing bar is put down It is assigned among prefabricated doubly-linked beam, when under-reinforced presses minimum steel ratio, rolled steel dosage can be caused to increase.
Bearing capacity is less than single coupling beam after prefabricated doubly-linked beam surrender, relatively early to enter strain, but ductility is better than single coupling beam. For single coupling beam structure when top displacement reaches 10mm, the damage of most coupling beams, which comes into, closes on failure stage, with continuing plus Carry, single coupling beam is destroyed rapidly, and depression of bearing force is obvious.Prefabricated doubly-linked girder construction is when top displacement reaches 11mm, most coupling beams Damage, which comes into, closes on failure stage, and with continuing to load, prefabricated doubly-linked beam destroys, but depression of bearing force compares phase To gentle, good ductility is shown.
The lower coupling beam of prefabricated doubly-linked beam uses prefabricated coupling beam, and upper coupling beam is using overlapping coupling beam, compared to lower coupling beam using prefabricated Coupling beam, upper coupling beam save the technique that template is added in lower coupling beam using cast-in-place coupling beam.In the prefabricated of lower coupling beam and upper coupling beam Part is after installation is complete, can the cast-in-place concrete on the face of coupling beam directly on prefabricated, installation is simple, and easy for construction, raising finishes The speed of application and construction quality of structure.
It is lateral that the prefabricated energy consumption Design of Connecting Beam method of overall assembled shear wall structure of the present invention is suitable for shear wall structure The larger situation of rigidity, the rigidity of structure can be obviously reduced by the present invention, so as to reduce big shake lower structure seismic response, increased Add structure ductility, achieve the purpose that to ensure structural seismic resistance safety.Particularly prefabricated coupling beam shearing is excessive, it is difficult to meets shearing resistance The situation of bearing capacity, the rigidity of prefabricated coupling beam can be obviously reduced by the present invention, so as to reduce coupling beam shearing, met On the premise of conceptual Design of Earthquake Resistance, reach the target saved building materials, reduce cost.
Compared with prior art, the present invention has following remarkable result:
(1) present invention calculates coupling beam using bending stiffness equivalent method, only by carrying out reduction to bending stiffness, you can Realize the elastic calculation of prefabricated doubly-linked beam, illustrate using bending stiffness equivalent method can quickly to prefabricated doubly-linked beam model into Row calculates.
It is (2) of the invention that since the stress amount of shear walls of overall assembled shear wall structure is more, the rigidity of structure is partially firm, Method by setting the prefabricated doubly-linked beam of assembled energy consumption, the overall stiffness of structure reduce about 7%, are cut so as to reduce earthquake Power about 8%.It is partially firm to solve overall assembled shear wall structure, seismic force problem bigger than normal.
(3) present invention is under big shake effect, and when the story drift of structure reaches 1/750, intermediate floor partial precast is double Coupling beam initially enters surrender, and with the increasing of seismic force, the scope of surrender further increases, and component damage scope compares Dan Lian Beam is big by 15%, has given full play to the energy consumption effect of coupling beam, has added coupling beam energy dissipation capacity and structure ductility.
(4) bending stiffness of the prefabricated doubly-linked beam of the present invention is smaller, reduce structure overall stiffness and seismic response it is same When, the arrangement of reinforcement of component is also obviously reduced, and structural material dosage about reduces 7%, has obvious economic benefit.
(5) the lower coupling beam of the prefabricated doubly-linked beam of the present invention uses prefabricated coupling beam, and upper coupling beam is using overlapping coupling beam, compared to lower company Beam uses prefabricated coupling beam, and upper coupling beam saves the technique that template is added in lower coupling beam using cast-in-place coupling beam, and installation is simple, applies Work is convenient, improves the speed of application and construction quality of structure.
Brief description of the drawings
The present invention is described in further details with reference to the accompanying drawings and detailed description.
Fig. 1 is the planar structure schematic diagram for the case history being designed using design method of the present invention;
Fig. 2 is the Three-dimensional CAD schematic diagram for the case history being designed using design method of the present invention;
Fig. 3 is the structure diagram of prefabricated doubly-linked beam in design method of the present invention;
Fig. 4 is the story drift curve map under geological process using the case history of design method of the present invention;
Fig. 5 is coupling beam positional structure schematic diagram in design method of the present invention;
Fig. 6 is the distribution schematic diagram of coupling beam reduction coefficient in design method of the present invention;
Fig. 7 is the distribution schematic diagram that wall is numbered in design method of the present invention;
Single coupling beam arrangement of reinforcement result of calculation distribution schematic diagram when Fig. 8 is small shake;
Fig. 9 is arrangement of reinforcement result of calculation distribution schematic diagram in prefabricated doubly-linked beam under the conditions of small shake;
Single coupling beam arrangement of reinforcement result of calculation distribution schematic diagram when Figure 10 is middle shake;
Figure 11 is arrangement of reinforcement result of calculation distribution schematic diagram in prefabricated doubly-linked beam under the conditions of middle shake;
Figure 12 is 3s moment list coupling beam degree of impairment structure diagrams under the conditions of big shake;
Figure 13 is 2s moment prefabricated doubly-linked beam degree of impairment structure diagram under the conditions of big shake;
Figure 14 is 20s moment list coupling beam degree of impairment structure diagrams under the conditions of big shake;
Figure 15 is 20s moment prefabricated doubly-linked beam degree of impairment structure diagram under the conditions of big shake;
Single coupling beam is in the corresponding coupling beam reinforcement stresses cloud atlas of ultimate bearing capacity, reinforcement stresses when Figure 16 is big shake 394MPa;
Figure 17 should in the corresponding coupling beam reinforcement stresses cloud atlas of ultimate bearing capacity, reinforcing bar for prefabricated doubly-linked beam under the conditions of big shake Power is 400MPa;
Single coupling beam is in node district concrete plastic strain figure, the larger compressive strain of concrete when Figure 18 is big shake 0.036;
Figure 19 is prefabricated doubly-linked beam under the conditions of big shake in node district concrete plastic strain figure, the larger compressive strain of concrete 0.033;
Figure 20 is to match somebody with somebody reinforcement structure schematic diagram using the reality of single coupling beam of design method of the present invention;
Figure 21 is to match somebody with somebody reinforcement structure schematic diagram using the reality of the prefabricated doubly-linked beam of design method of the present invention.
Description of reference numerals
1st, upper coupling beam;2nd, lower coupling beam;3rd, wall;4th, cast-in-place join domain.
Embodiment
Case history and result of calculation
This project is a Tall Shear Wall Structures, and more than ground totally 33 layers, structure heights of roofs is 99m, and fortification intensity is 7 degree, two class places, fundamental wind pressure 0.5kN/m2, surface roughness is C classes, as shown in Figure 1 and Figure 2.
Since the rigidity of structure of overall assembled shear wall is larger, the deformation of structure is smaller, as shown in figure 3, passing through setting Prefabricated doubly-linked beam reduces the rigidity of structure, reduces the response under geological process.
It was found from the relative storey displacement angular curve of Fig. 4, the story drift in 0 degree and 90 degree direction is respectively 1/1428 and 1/ 1701, much smaller than Criterion restriction 1/1000, there is larger rich degree, by setting prefabricated doubly-linked beam to reduce the rigidity of structure and ground Brisance.
Table 1 is compared and analyzed using 6 coupling beam schemes, wherein difference of the prefabricated doubly-linked beam according to upper and lower coupling beam height Divide 5 kinds of situations, the cross-section of coupling beam size of each scheme is shown in Table 1.
Table 1:Cross-section of coupling beam size (mm)
Former scheme Scheme 1 Scheme 2 Scheme 3 Scheme 4 Scheme 5
Upper coupling beam 200×500 200×140 200×200 200×250 200×300 200×350
Lower coupling beam -- 200×360 200×300 200×250 200×200 200×150
Under horizontal force action, the top displacement and base shear of shear wall the results are shown in Table shown in 2.
Table 2:Displacement-shearing result (kN, mm)
Table 3:Line stiffness kN/m
Former scheme Scheme 1 Scheme 2 Scheme 3 Scheme 4 Scheme 5
1 14118 12625 11077 10704 11100 11846
2 8678 8372 8000 7561 10325 9915
3 2784 2282 2133 2141 2173 2259
It was found from table 2 and table 3, the structure Line stiffness of 1~scheme of scheme 5 is respectively less than the Line stiffness of former scheme, wherein up and down 3 Line stiffness of scheme when coupling beam is highly identical is minimum, is the 76% of former scheme Line stiffness, and the Line stiffness of scheme 1 is maximum, for original The 89% of scheme Line stiffness.
When structure maximum story drift be less than Criterion restriction 20% when, 2~scheme of scheme 4 can be used, when structure most When big story drift is the 10%~20% of Criterion restriction, scheme 1 and scheme 5 can be used, this project is due to the maximum of structure Story drift is less than the 20% of Criterion restriction, and the scheme 3 for choosing prefabricated doubly-linked beam rigidity minimum is designed.
The design method of prefabricated doubly-linked beam, includes the following steps in the overall assembled shear wall building structure
(1), single coupling beam in overall assembled shear wall building structure is established using the finite element method of the prior art Single coupling beam analysis model, according to building structure and plane split require, using existing finite element method, to list Coupling beam analysis model carries out structure Design and Calculation, determines depth of beam and beam length, and coupling beam is defined as to beam of the span-depth radio less than 5, As shown in Figure 5;
(2), the coupling beam determined according to step (1), by the analysis to coupling beam position, further discriminate between cast-in-place coupling beam and Prefabricated doubly-linked beam, wherein, the coupling beam of Lift & Stairs position is cast-in-place coupling beam, and the coupling beam of other positions is prefabricated doubly-linked beam, in advance Doubly-linked beam processed has upper coupling beam 1, lower coupling beam 2 and the cast-in-place join domain 4 being connected with upper coupling beam 1 and lower 2 end of coupling beam, The cast-in-place join domain 4 is connected with the wall 3 of shear wall;
(3), the prefabricated doubly-linked beam determined according to step (2), sets the bending stiffness reduction coefficient of prefabricated doubly-linked beam, by Highly it is 500mm in this item purpose coupling beam, therefore bending stiffness reduction coefficient takes 0.76, cast-in-place coupling beam Stiffness degradation coefficient For 0.7, the Stiffness degradation coefficient of prefabricated energy consumption coupling beam is 0.53, if as shown in fig. 6, i.e. rounding body fabricated shear wall is built The bending stiffness reduction coefficient of single coupling beam is η in building structure, then the bending stiffness reduction coefficient of prefabricated doubly-linked beam is 0.76 η;
(4), the prefabricated doubly-linked sill bolt for obtaining step (3) enters in single coupling beam analysis model of step (1), by corresponding position Single coupling beam be replaced as doubly-linked beam, doubly-linked beam computation model is obtained, using existing finite element method, to doubly-linked beam meter Calculate model and carry out structure Design and Calculation, obtain the structure of prefabricated doubly-linked beam, wherein, always high H is 400mm to prefabricated doubly-linked Liang, lower company 2 high h1 of beam is 240mm, and the slit width h2 between upper coupling beam 1, lower coupling beam 2 is 10mm, and the height of upper 1 cast-in-place part of coupling beam is that hb is 140mm, the height h3 of upper 1 pre-erection of coupling beam is 10mm, h3=H-h1-h2-hb;Upper coupling beam 1, lower coupling beam 2 pre-erection End is connected to an entirety by cast-in-place join domain 4, and the length of the cast-in-place join domain 4 is 100mm, prefabricated doubly-linked beam The anchorage length that longitudinal tensile reinforcing bar is stretched into shear wall is not less than 1.2La, and wherein La is that the anchoring of longitudinal tensile reinforcing bar is grown Degree;
At the same time existing finite element method is used to doubly-linked beam computation model, obtain the arrangement of reinforcement of prefabricated doubly-linked beam as a result, The area of reinforcement As of prefabricated doubly-linked beam is calculated by arrangement of reinforcement result;
1) small shake result of calculation
Table 4:Small shake overall calculation the results list
It was found from the small shake overall calculation result of table 4, prefabricated doubly-linked beam increases about 4% than the cycle of single coupling beam, and shearing subtracts Small by about 3%, the displacement under geological process is reduced by about 4%, and the displacement under wind load is reduced by about 7%;Just again than being reduced by about 7%, position Move than being reduced by about 1% with floor bearing capacity ratio.
Table 5:Single operating mode internal force contrast under small shake
A) under geological process, shear wall axle power most size about 14% of the prefabricated doubly-linked beam than single coupling beam.
B) under geological process, prefabricated doubly-linked beam shears most size 6% than the shear wall of single coupling beam.
C) under geological process, shear wall moment of flexure most size about 3% of the prefabricated doubly-linked beam than single coupling beam.
It was found from the small shake arrangement of reinforcement result of Fig. 8, Fig. 9, the arrangement of reinforcement of the node reinforcement ratio list coupling beam of prefabricated doubly-linked beam few about 8%~ 10%.
2) shake result of calculation in
Table 6:Middle shake global index
The middle shake overall calculation result of table 6 understands that prefabricated doubly-linked beam is reduced by about 1% than the shearing of single coupling beam, geological process Under displacement be reduced by about 6%~9%.
It was found from the small shake arrangement of reinforcement result of Figure 10, Figure 11, the arrangement of reinforcement few about 8% of the node reinforcement ratio list coupling beam of prefabricated doubly-linked beam ~11%.
3) result of calculation is shaken greatly
Big shaking force elastic-plastic calculation analysis is carried out using artificial ripple.Acceleration takes 220cm/s2, and calculating is 20s when holding.
It was found from Figure 12, Figure 13, plastic hinge that single coupling beam scheme occurs in 3s moment indivedual coupling beams, and prefabricated doubly-linked beam In 2s moment parts coupling beam, in middle and upper part, has there is plastic hinge to scheme in floor, and it is obvious than single coupling beam scheme to go out to cut with scissors the time It is early, illustrate that the coupling beam of prefabricated doubly-linked beam scheme consumes energy in advance.
It was found from Figure 14, Figure 15, single coupling beam to go out to cut with scissors scope fewer than prefabricated doubly-linked beam, single coupling beam in bottom floor not There is plastic hinge, and all there is plastic hinge there are coupling beam in the prefabricated substantially all floor of doubly-linked beam scheme, illustrates prefabricated doubly-linked The coupling beam of beam scheme more takes full advantage of the energy consumption of coupling beam.
From Figure 16, Figure 17, underbeam tension reinforcement almost enters yielding stage at the same time on prefabricated doubly-linked beam;And Dan Lian Beam tension reinforcement and not up to yield limit, depression of bearing force are due to that node district concrete reaches capacity compression strength, crushing Destroy, node district concrete plastic strain is as shown in Figure 18, Figure 19.When single coupling beam crushing of concrete destroys, the larger pressure of concrete Strain as 0.036, damage envelope concentrates on the end of coupling beam, and compressive strain is larger more than 0.02 region, single coupling beam at this time Top displacement is 20mm, is taken under same vertices displacement, and the prefabricated larger compressive strain of doubly-linked beam concrete is 0.033, but compressive strain is big In 0.02 region very little.
Table 7:Big shake global index
The big shake overall calculation result of table 7 understands that prefabricated doubly-linked beam scheme is reduced by about 6% than the shearing of single coupling beam scheme ~8%, the displacement under geological process is reduced by about 23%~25%, the reason is that since the coupling beam of prefabricated doubly-linked beam scheme is in earthquake Effect is very fast to there is plastic hinge, and plastic hinge occurs in most of coupling beam, has given full play to the energy consumption effect of coupling beam, and coupling beam is bent Structure integrally reduces after clothes, reduces the response under geological process.
(5), with reference to the area of reinforcement As of prefabricated doubly-linked beam obtained above and the construction of prefabricated doubly-linked beam, choose prefabricated The actual arrangement of reinforcement of doubly-linked beam, it is real to be not less than As with area of reinforcement A, and it is not more than 1.05As, choose representational coupling beam and carry out It is real to illustrate with reinforcing bar, as shown in Figure 20, Figure 21.
The gluten and bottom muscle of single coupling beam are 3 φ 20 (942mm2), and prefabricated doubly-linked beam gluten and bottom muscle are 2 φ 16 (804mm2), saves the amount of reinforcement about 15% of coupling beam.
(6), according to the structure of the prefabricated doubly-linked beam of above-mentioned acquisition and actual arrangement of reinforcement, construction drawing is drawn, completes overall dress Design with prefabricated doubly-linked beam in formula shear wall building structure.
Performance-based seismic design is carried out to structure under above-mentioned prefabricated energy consumption Design of Connecting Beam method standard, to high-layer shear force wall The anti-seismic performance of structural elements is accurately analyzed, and engineer is rapidly carried out the anti-seismic performance of Tall Shear Wall Structures Design.
The above embodiment of the present invention is not limiting the scope of the present invention, and embodiments of the present invention are unlimited In this, all this kind the above according to the present invention, according to the ordinary technical knowledge and customary means of this area, is not taking off Under the premise of the above-mentioned basic fundamental thought of the present invention, the modification for the other diversified forms made to said structure of the present invention, replace Or change, it should all fall within the scope and spirit of the invention.

Claims (3)

  1. A kind of 1. design method of prefabricated doubly-linked beam in overall assembled shear wall building structure, it is characterised in that this method bag Include following steps:
    Step (1):Establish in overall assembled shear wall building structure single coupling beam analysis model, according to the facade of building structure and Plane, which is split, to be required, and using existing finite element method, is carried out structure Design and Calculation to single coupling beam analysis model, is determined beam Height and beam length, coupling beam is defined as to beam of the span-depth radio less than 5;
    Step (2):The coupling beam determined according to step (1), by the analysis to coupling beam position, further discriminates between cast-in-place coupling beam and pre- Doubly-linked beam processed, wherein, the coupling beam of Lift & Stairs position is cast-in-place coupling beam, and the coupling beam of other positions is prefabricated doubly-linked beam, described Prefabricated doubly-linked beam has upper coupling beam, lower coupling beam and the cast-in-place join domain being connected with upper coupling beam and lower coupling beam end, this is existing Join domain is poured with the wall of shear wall to be connected;
    Step (3):The prefabricated doubly-linked beam determined according to step (2), sets the bending stiffness reduction coefficient of prefabricated doubly-linked beam, rounding The bending stiffness reduction coefficient of single coupling beam is η in body fabricated shear wall building structure, then the bending stiffness folding of prefabricated doubly-linked beam It is 0.76 η to subtract coefficient;
    Step (4):The prefabricated doubly-linked beam that step (3) is obtained is substituted into single coupling beam analysis model of step (1), by corresponding position Single coupling beam is replaced as doubly-linked beam, obtains doubly-linked beam computation model, and using existing finite element method, mould is calculated to doubly-linked beam Type carries out structure Design and Calculation, obtains the structure of prefabricated doubly-linked beam, and obtain the arrangement of reinforcement of prefabricated doubly-linked beam as a result, by arrangement of reinforcement knot The area of reinforcement As of prefabricated doubly-linked beam is calculated in fruit;
    Step (5):The structure that prefabricated doubly-linked beam is calculated by step (4) is as follows:Always high H, lower coupling beam are high by prefabricated doubly-linked Liang For h1, the slit width between upper coupling beam, lower coupling beam is h2, and the height of the upper cast-in-place part of coupling beam is hb, the height of upper coupling beam pre-erection Spend for h3, h3=H-h1-h2-hb;Upper coupling beam, the end of lower coupling beam pre-erection are connected to one by the cast-in-place join domain A entirety, the length of the cast-in-place join domain is 100mm, and the longitudinal tensile reinforcing bar of prefabricated doubly-linked beam stretches into the anchoring in shear wall Length is not less than 1.2La, and wherein La is the anchorage length of longitudinal tensile reinforcing bar;
    Step (6):The prefabricated doubly-linked beam obtained with reference to the area of reinforcement As and step (5) of the prefabricated doubly-linked beam that step (4) obtains Construction, choose the actual arrangement of reinforcement of prefabricated doubly-linked beam, it is real to be not less than As with area of reinforcement A, and be not more than 1.05As;
    Step (7):The actual arrangement of reinforcement that the structure and step (6) of the prefabricated doubly-linked beam obtained according to step (5) obtain, drafting are applied Work figure, completes the design of prefabricated doubly-linked beam in overall assembled shear wall building structure.
  2. 2. the design method of prefabricated doubly-linked beam in overall assembled shear wall building structure according to claim 1, it is special Sign is:In the step (3), η values are 0.7.
  3. 3. the design method of prefabricated doubly-linked beam in overall assembled shear wall building structure according to claim 1, it is special Sign is:In the step (5), H >=400mm, h1 240mm, h2 10mm, hb 140mm.
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