CN101845854B - Frame beam column fire-resistant node with catenary effect and construction method thereof - Google Patents

Frame beam column fire-resistant node with catenary effect and construction method thereof Download PDF

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Publication number
CN101845854B
CN101845854B CN2010101777832A CN201010177783A CN101845854B CN 101845854 B CN101845854 B CN 101845854B CN 2010101777832 A CN2010101777832 A CN 2010101777832A CN 201010177783 A CN201010177783 A CN 201010177783A CN 101845854 B CN101845854 B CN 101845854B
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CN
China
Prior art keywords
steel
girder steel
flange
trapezoidal
key
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CN2010101777832A
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Chinese (zh)
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CN101845854A (en
Inventor
陈适才
闫维明
李振宝
何浩祥
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北京工业大学
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Publication of CN101845854A publication Critical patent/CN101845854A/en
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Publication of CN101845854B publication Critical patent/CN101845854B/en

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Abstract

The invention relates to a frame beam column fire-resistant node which is formed by increasing a trapezoidal connecting key at the end part of a steel beam, carrying out high-strength bolt anchoring on an upper flange at the beam end and simultaneously carrying out limited anchoring on a lower flange at the beam end, wherein the lower flange at the beam end has the limited telescopic capacity under the environment of a fire disaster. The implementation of the frame beam column fire-resistant node is as follows: cutting the steel beam with the flanges and a web plate and the trapezoidal connecting key, and then respectively assembling a column, the steel beam, the trapezoidal connecting key, a stiffening plate, an end plate and a steel plate through high-strength bolts, ordinary bolts and welding seams. The frame beam column fire-resistant node is applicable to the industry with higher requirements on the fire-resistant performance and the anti-collapse capacity of the structure and a civil steel frame structure. The frame beam column fire-resistant node has the advantages of simple structure, convenient construction and low cost of required materials, and can avoid the local buckling of the beam under the high-temperature environment, form the catenary effect and have the good fire-resistant performance and the anti-collapse capacity.

Description

Frame beam column fire-resistant node and job practices thereof with catenary effect
(1) technical field
The present invention relates to a kind of structural element, particularly a kind of frame beam column fire-resistant node.
(2) background technology
Along with expanding economy, the building fire that takes place frequently can make structure that damage takes place or collapse, structure fire is to make structure avoid collapsing in fire takes place by the back regular hour with the purpose that resists the fire design, with safety evacuation and fire-fighting in the assurance building sufficient attack time is arranged.Yet at present both at home and abroad standard all is by guaranteeing that independent member stablizing under fire guarantee integrally-built safety, because the stress of member and the member in constraints and the practical structures have a great difference separately, therefore the fire of member reacts the reaction that can not represent overall structure to produce separately, the structure of collapsing of some integrally-built fire resistance tests and reality shows: girder steel can show certain catenary effect in the overall structure in serious fire, change structure stress mechanism, improved the fire resistance of structure, cripling appears in the steel column and the girder steel edge of a wing part steel plate of position of joints simultaneously, impairs the anti-ability of collapsing of structure.Because it is poor that fire makes lower flange of girder edge temperature be higher than the top flange formation temperature, the lower flange of girder edge generation flexing that causes the node place, therefore some researchers study different bean column nodes, these nodes change beam column type of attachment relaxed constraints or in varying degrees the node part are being strengthened, the switching performance that loosens meeting infringement node of constraint, and the reinforcement of constraint can be quickened bottom flange generation flexing.Therefore exploitation can either guarantee the whole switching performance of node, can bring into play the catenary effect of beam again and the bean column node of cripling does not take place, thereby improve overall structure fire resistance and the anti-ability of collapsing, and is significant to the anti-fire of engineering structures.
(3) summary of the invention
The purpose of this invention is to provide a kind of frame beam column fire-resistant node and job practices thereof with catenary effect, solve after serious fire takes place, can show certain catenary effect in the girder steel, change structure stress mechanism, cripling appears in the steel column and the girder steel edge of a wing part steel plate of position of joints simultaneously, impairs the technical problem of the anti-ability of collapsing of structure; And solution has the job practices problem of the frame beam column fire-resistant node of catenary effect.
For achieving the above object, the present invention adopts following technical scheme:
A kind of frame beam column fire-resistant node with catenary effect, comprise post, girder steel and end plate, end plate is connected the side of post by bolt, girder steel is connected the side of end plate, described girder steel is i iron or H shaped steel, there are one or three angle kerves the end of girder steel, and position that otch is cut is bottom flange and web, and the length that cuts of bottom flange is 40%~70% of girder steel whole height H; The cutting part of beam is connected with trapezoidal connecting key, described trapezoidal connecting key is made up of the relative double flute steel of web, its longitudinal section is a trapezoid, the whole height of trapezoidal connecting key is identical with the web height of girder steel, the upper length L of trapezoidal connecting key is 1~1.5 times of whole height of trapezoidal connecting key, the breach angle of trapezoidal connecting key web is identical with girder steel otch angle, the top flange of girder steel is connected with the top of trapezoidal connecting key by high-strength bolt, and the bottom flange of girder steel is connected with the bottom of trapezoidal connecting key by plain bolt; The top flange of girder steel and end, bottom flange all are welded with steel plate, and steel plate is connected with end plate by weld seam together with trapezoidal connecting key.
Described post is steel column or steel core concrete column.
Described post has on the edge of a wing of girder steel junction and is welded with stiffener.
The both sides channel-section steel web of described trapezoidal connecting key is provided with stiffening rib or does not establish stiffening rib.
The bolt hole of described plain bolt is elongated plain bolt hole, and the keyhole major diameter is 5 times~10 times of minor axis.Described high-strength bolt and plain bolt are respectively about the steel beam web plate symmetric arrangement, and the high-strength bolt of the every side of steel beam web plate is single-row or biserial, and the quantity of plain bolt is 30%~50% of high-strength bolt number.
A kind of its construction method step of frame beam column fire-resistant node with catenary effect is as follows:
Step 1 is welded stiffener on the edge of a wing of the design attitude of the girder steel on the post and web, and in the side welded end plate;
Step 2 is cut the edge of a wing and the web part steel of girder steel end, and during cutting, at first along laterally the bottom flange being cut of girder steel, bottom flange excision span access location length is 40%~70% of girder steel whole height H; Secondly steel beam web plate is cut, the web line of cut be from bottom the top flange of girder steel to the cut point of bottom flange; Top flange, girder steel end symmetry web after cutting is opened the high-strength bolt hole; The symmetry web is opened microscler plain bolt hole in bottom flange, girder steel end, and the keyhole major diameter is 5 times~10 times of minor axis, and its quantity is 30%~50% of high-strength bolt hole;
Step 3, choose two same model channel-section steels, its height is identical with the steel beam web plate height, make the channel-section steel web form trapezoidal connecting key relatively, cut the top of trapezoidal connecting key then, make its length become 1~1.5 times of whole height of trapezoidal connecting key, cut the web of trapezoidal connecting key then, cut direction is parallel with the end cut direction of girder steel, and open high-strength bolt hole and microscler plain bolt hole respectively in the upper and lower of trapezoidal connecting key, keyhole is distinguished corresponding on institute's keyhole of opening and girder steel top flange and the girder steel bottom flange;
Step 4, by high-strength bolt the top of girder steel top flange and trapezoidal connecting key is fixed, be connected by the bottom of plain bolt girder steel bottom flange and trapezoidal connecting key, at girder steel top flange and end, bottom flange difference welding steel plate, lift the girder steel that connects then itself and the end plate that is welded on the post side are welded.
The intensity of channel-section steel described in the step 3 is more than or equal to the used steel strength of girder steel.
Compared with prior art the present invention has following characteristics and beneficial effect:
(1) under normal mode of occupation, the rigidity of trapezoidal connecting key improves, and whole switching performance is consistent with general node or raising arranged.
(2) when breaking out of fire, there is the trapezoidal connecting key bottom flange of microscler bolt hole to locate in displacement, limited slip can take place in the girder steel bottom flange, alleviates thermal expansion stress, when reducing girder steel bottom flange cripling, reduces the cripling of node place post.Thereby reduce the node damage.
(3) when serious fire, even the bottom flange bolt failure, because the strong connection of top flange, girder steel can produce good catenary effect, in the fire temperature-fall period, can reduce permanent set.Behind the fire, only need to change reinforcing and the maintenance that the bottom flange plain bolt gets final product implementation structure.
(4) material therefor is with low cost, simple structure, and fire resistance is good.
The present invention has overcome the conventional frame beam column after fire takes place, cause the girder steel bottom flange that flexing takes place, the final shortcoming that may cause structure to collapse, solved the cripling that when serious fire takes place, reduces node place post and reduced the node damage, reduced in the fire fighting process because the permanent set technical problem that inhomogeneous cooling produces simultaneously.
The present invention can be widely used in the structure fire resistance performance and resist the higher industry of the Capability Requirement that collapses and the bean column node of civilian steel framed structure.
(4) description of drawings
The present invention will be further described in detail below in conjunction with accompanying drawing.
Fig. 1 is a structure front schematic view of the present invention.
Fig. 2 is a structure three-dimensional lateral view of the present invention.
Fig. 3 is the three-dimensional side view of girder steel.
Fig. 4 is the front schematic view of girder steel.
Fig. 5 is the three-dimensional side view of trapezoidal connecting key.
Fig. 6 is the front schematic view of trapezoidal connecting key.
Reference numeral: 1-post, 2-girder steel, the trapezoidal connecting key of 3-, 4-stiffener, 5-end plate, 6-steel plate, 7-high-strength bolt, 8-plain bolt, 9-weld seam.
(5) specific embodiment
Embodiment is referring to Fig. 1~shown in Figure 6: a kind of frame beam column fire-resistant node with catenary effect, comprise post 1, girder steel 2 and end plate 5, end plate 5 is connected the side of post 1 by bolt, girder steel 2 is connected the side of end plate 5, described girder steel 2 is i iron or H shaped steel, there are one or three angle kerves the end of girder steel 2, and position that otch is cut is bottom flange and web, and the length that cuts of bottom flange is 40%~70% of girder steel whole height H; The cutting part of beam is connected with trapezoidal connecting key 3, described trapezoidal connecting key 3 is made up of the relative double flute steel of web, its longitudinal section is a trapezoid, the whole height of trapezoidal connecting key 3 is identical with the web height of girder steel 2, the upper length L of trapezoidal connecting key 3 is 1~1.5 times of whole height of trapezoidal connecting key 3, the breach angle of trapezoidal connecting key 3 webs is identical with girder steel otch angle, the top flange of girder steel 2 is connected with the top of trapezoidal connecting key 3 by high-strength bolt 7, and the bottom flange of girder steel 2 is connected with the bottom of trapezoidal connecting key 3 by plain bolt 8; The top flange of girder steel 2 and end, bottom flange all are welded with steel plate 6, and steel plate 6 is connected with end plate 5 by weld seam 9 together with trapezoidal connecting key 3.Described post 1 is steel column or steel core concrete column.Described post 1 has on the edge of a wing of girder steel junction and is welded with stiffener 4.The both sides channel-section steel web of described trapezoidal connecting key 3 is provided with stiffening rib or does not establish stiffening rib.The bolt hole of described plain bolt is elongated plain bolt hole, and the keyhole major diameter is 5 times~10 times of minor axis.Described high-strength bolt 7 and plain bolt 8 are respectively about the steel beam web plate symmetric arrangement, and the high-strength bolt 7 of the every side of steel beam web plate is single-row or biserial, and the quantity of plain bolt 8 is 30%~50% of high-strength bolt number.
Implementation process of the present invention, its step is as follows:
Step 1, welding stiffener 4 on the edge of a wing of the design attitude of the girder steel on the post 2 and web, and in side welded end plate 5;
Step 2 is cut the edge of a wing and the web part steel of girder steel 2 ends, and during cutting, at first along laterally the bottom flange being cut of girder steel, bottom flange excision span access location length is 40%~70% of girder steel whole height H; Secondly steel beam web plate is cut, the web line of cut be from bottom the top flange of girder steel to the cut point of bottom flange; Top flange, girder steel end symmetry web after cutting is opened the high-strength bolt hole; The symmetry web is opened microscler plain bolt hole in bottom flange, girder steel end, and the keyhole major diameter is 5 times~10 times of minor axis, and its quantity is 30%~50% of high-strength bolt hole;
Step 3, choose two same model channel-section steels, its height is identical with the steel beam web plate height, make the channel-section steel web form trapezoidal connecting key 3 relatively, cut the top of trapezoidal connecting key 3 then, make its length become 1~1.5 times of whole height of trapezoidal connecting key 3, cut the web of trapezoidal connecting key 3 then, cut direction is parallel with the end cut direction of girder steel 2, and open high-strength bolt hole and microscler plain bolt hole respectively in the upper and lower of trapezoidal connecting key 3, keyhole is distinguished corresponding on institute's keyhole of opening and girder steel top flange and the girder steel bottom flange;
Step 4, by high-strength bolt 7 top of girder steel top flange and trapezoidal connecting key 3 is fixed, by plain bolt 8 bottom of girder steel bottom flange with trapezoidal connecting key 3 is connected, at girder steel top flange and end, bottom flange difference welding steel plate 6, lift the girder steel that connects then itself and the end plate 5 that is welded on the post side are welded.
The intensity of channel-section steel described in the step 3 is more than or equal to the used steel strength of girder steel.
More than be exemplary embodiments of the present invention, enforcement of the present invention more than that.

Claims (8)

1. frame beam column fire-resistant node with catenary effect, comprise post (1), girder steel (2) and end plate (5), end plate (5) is connected the side of post (1) by bolt, girder steel (2) is connected the side of end plate (5), it is characterized in that: described girder steel (2) is i iron or H shaped steel, there are one or three angle kerves the end of girder steel (2), and position that otch is cut is bottom flange and web, and the length that cuts of bottom flange is 40%~70% of girder steel whole height H; The cutting part of beam is connected with trapezoidal connecting key (3), described trapezoidal connecting key (3) is made up of the relative double flute steel of web, its longitudinal section is a trapezoid, the whole height of trapezoidal connecting key (3) is identical with the web height of girder steel (2), the upper length L of trapezoidal connecting key (3) is 1~1.5 times of whole height of trapezoidal connecting key (3), the breach angle of trapezoidal connecting key (3) web is identical with girder steel otch angle, the top flange of girder steel (2) is connected with the top of trapezoidal connecting key (3) by high-strength bolt (7), and the bottom flange of girder steel (2) is connected with the bottom of trapezoidal connecting key (3) by plain bolt (8); The top flange of girder steel (2) and end, bottom flange all are welded with steel plate (6), and steel plate (6) is connected with end plate (5) by weld seam (9) together with trapezoidal connecting key (3).
2. want 1 described frame beam column fire-resistant node with catenary effect according to right, it is characterized in that: described post (1) is steel column or steel core concrete column.
3. the frame beam column fire-resistant node with catenary effect according to claim 1 is characterized in that: described post (1) has on the edge of a wing of girder steel junction and is welded with stiffener (4).
4. the frame beam column fire-resistant node with catenary effect according to claim 1 is characterized in that: the both sides channel-section steel web of described trapezoidal connecting key (3) is provided with stiffening rib or does not establish stiffening rib.
5. the frame beam column fire-resistant node with catenary effect according to claim 1 is characterized in that: the bolt hole of described plain bolt is elongated plain bolt hole, and the keyhole major diameter is 5 times~10 times of minor axis.
6. the frame beam column fire-resistant node with catenary effect according to claim 1, it is characterized in that: described high-strength bolt (7) and plain bolt (8) are respectively about the steel beam web plate symmetric arrangement, the high-strength bolt of the every side of steel beam web plate (7) is single-row or biserial, and the quantity of plain bolt (8) is 30%~50% of high-strength bolt number.
7. the job practices with frame beam column fire-resistant node of catenary effect according to claim 1 is characterized in that step is as follows:
Step 1 is welded stiffener (4) on the post and edge of a wing girder steel (2) junction and web, and in side welded end plate (5);
Step 2 is cut the edge of a wing and the web part steel of girder steel (2) end, and during cutting, at first along laterally the bottom flange being cut of girder steel, bottom flange excision span access location length is 40%~70% of girder steel whole height H; Secondly steel beam web plate is cut, the web line of cut be from bottom the top flange of girder steel to the cut point of bottom flange; Top flange, girder steel end symmetry web after cutting is opened the high-strength bolt hole; The symmetry web is opened microscler plain bolt hole in bottom flange, girder steel end, and the keyhole major diameter is 5 times~10 times of minor axis, and its quantity is 30%~50% of high-strength bolt hole;
Step 3, choose two same model channel-section steels, its height is identical with the steel beam web plate height, make the channel-section steel web form trapezoidal connecting key (3) relatively, cut the top of trapezoidal connecting key (3) then, make its length become 1~1.5 times of whole height of trapezoidal connecting key (3), cut the web of trapezoidal connecting key (3) then, cut direction is parallel with the end cut direction of girder steel (2), and open high-strength bolt hole and microscler plain bolt hole respectively in the upper and lower of trapezoidal connecting key (3), keyhole is distinguished corresponding on institute's keyhole of opening and girder steel top flange and the girder steel bottom flange;
Step 4, by high-strength bolt (7) top of girder steel top flange and trapezoidal connecting key (3) is fixed, by plain bolt (8) bottom of girder steel bottom flange with trapezoidal connecting key (3) is connected, the welding steel plate (6) respectively in girder steel top flange and end, bottom flange, the girder steel that connects of lifting and then with girder steel and end plate (5) welding that is welded on the post side.
8. the job practices with frame beam column fire-resistant node of catenary effect according to claim 7 is characterized in that: the intensity of channel-section steel described in the step 3 is more than or equal to the used steel strength of girder steel.
CN2010101777832A 2010-05-14 2010-05-14 Frame beam column fire-resistant node with catenary effect and construction method thereof CN101845854B (en)

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