CN102653965B - High-redundancy beam-string truss structure and implementation method - Google Patents
High-redundancy beam-string truss structure and implementation method Download PDFInfo
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Abstract
一种高冗余度张弦桁架结构及实施方法。结构包括上弦桁架、多根撑杆、多根拉索、固定铰支座和滑动铰支座，上弦桁架为由多根上弦桁架杆件相互连接构成的正放三角锥空间拱桁架；每根拉索两端相隔距离连接在上弦桁架下部的两个球节点上，多根拉索的部分结构交错设置；多根撑杆相隔距离垂直连接在上弦桁架下部和多根拉索间；固定铰支座上端与上弦桁架一侧下部的球节点相连，下端以固定的方式安装在位于上弦桁架一侧的支撑结构上；滑动铰支座上端与上弦桁架另一侧下部的球节点相连，下端以滑动的方式安装在位于上弦桁架另一侧的支撑结构上。本发明提供的高冗余度张弦桁架结构及实施方法具有结构冗余度高、抗倒塌性能好、施工简便、安全性能优越等优点。
A string tension truss structure with high redundancy and its implementation method. The structure includes upper chord trusses, multiple struts, multiple stay cables, fixed hinge supports and sliding hinge supports. The two ends of the cable are connected to the two ball joints at the lower part of the upper chord truss at a distance, and the partial structures of the multiple cables are arranged staggered; the multiple struts are vertically connected between the lower part of the upper chord truss and the multiple cables at a distance; the fixed hinge support The upper end is connected with the ball joint at the lower part of one side of the upper chord truss, and the lower end is fixedly installed on the supporting structure on one side of the upper chord truss; the upper end of the sliding hinge support is connected with the lower ball joint at the other side of the upper chord mounted on the support structure on the other side of the top chord truss. The high-redundancy tension string truss structure and implementation method provided by the invention have the advantages of high structural redundancy, good collapse resistance, simple construction, superior safety performance, and the like.
Description
Technical field
The invention belongs to the large-span prestressed steel structure technical field of building structure, particularly relate to a kind of highly redundant degree truss-string-structure and implementation method.
Background technology
Truss-string-structure is proposed in 1986 by Nihon University M.Saitoh professor the earliest, this structure is a kind of novel hybridization roof system that is different from traditional structure, the self-balancing combination construction that it is mainly made up of the truss member that winds up as press-bending parts, lower edge flexible cable and intermediate pressurised strut is also more successful large-span prestressed space structure body in a kind of Mixed Architecture development.
The feature of truss-string-structure is that system is simple, stressed clearly, form of structure is various, given full play to the advantage of hard and soft material, and it is simple and convenient to manufacture, transport, construct, and has therefore obtained good application.In recent years, become China's landmark building taking Pudong International Airport in Shanghai departure lounge, Guangzhou International Exhibition, Harbin International Conference and Exhibition Center, Beijing agricultural exhibition center, National Indoor Stadium as the Large-span Truss String Structure roof structure of representative.
At present, researcher in this field generally believe the force-mechanism of truss-string-structure be by lower edge flexible cable is applied prestressing force make to wind up truss member produce allowance for camber, the final amount of deflection of structure under load action reduced, and the resiliency supported that intermediate pressurised strut provides the truss member that winds up can be improved the stress performance of structure.The general truss that winds up being made up of the truss member that winds up adopts arched girder or truss arch, is born, to alleviate the horizontal movement of encircleing the horizontal thrust that bearing is produced and reducing sliding support in the horizontal thrust of load action lower arch by lower edge flexible cable.Truss-string-structure can be brought into play high strong tensile property of wringing, and improves overall structure stress performance, and bending component and tension member are learnt from other's strong points to offset one's weaknesses, collaborative work, thus reach self-balancing.
Truss-string-structure comprises plane truss-string-structure and space truss-string-structure, space truss-string-structure mainly contains unidirectional truss-string-structure, Bidirectional String Structure trussed construction, multidirectional truss-string-structure, radiant type truss-string-structure, its method for designing, construction means are ripe day by day, and researcher has also carried out many-sided research and obtained a lot of achievements.
Although truss-string-structure reasonable stress, rigidity are large, lightweight, because its lower edge flexible cable need to take a large amount of indoor headroom, have therefore limited its application.In addition, once traditional truss-string-structure lower edge flexible cable produces fracture, the truss that winds up will there will be and collapse, and can cause that adjacent structure produces destruction continuously, thus initiation catastrophic failure.Therefore, how to provide the expanding-chord that a kind of headroom takies less, structural redundancy degree is high girder construction, just become the key issue of expanding traditional tension string beam structure application.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of headroom takies less, structural redundancy degree is high truss-string-structure and implementation method.
In order to achieve the above object, highly redundant degree truss-string-structure provided by the invention comprises the truss that winds up, many struts, many drag-lines, fixed-hinged support and sliding hinge bearings, the truss that wherein winds up serve as reasons many wind up truss member by bolt sphere or solder sphere interconnect form just put pyrometric cone space arch truss; The two ends standoff distance of every drag-line is connected on two ball nodes of the truss bottom of winding up, and the part-structure of many drag-lines is crisscross arranged; Many strut standoff distances are vertically connected on and wind up between truss bottom and Duo Gen drag-line; The upper end of fixed-hinged support is connected with the ball node of truss one side lower part that winds up, and lower end is arranged in the braced structures that is positioned at truss one side of winding up in a fixed manner; The upper end of sliding hinge bearing is connected with the ball node of the truss opposite side bottom of winding up, and lower end is arranged in the braced structures that is positioned at the truss opposite side that winds up in the mode of sliding.
The quantity of described drag-line is three, and the outer end that is positioned at outermost two drag-lines is connected with the ball node of truss two side lower parts that wind up respectively.
The implementation method of highly redundant degree truss-string-structure provided by the invention comprises the following step carrying out in order:
1) according to section area and the corresponding initial prestress value F of the length of wind up in the restriction of structural span, interior net storey height and Load Combination operating condition design highly redundant degree truss-string-structure truss member and strut and sectional dimension, many drag-lines;
2) by bolt sphere or solder sphere connected mode, the many truss members that wind up are interconnected to the truss that winds up;
3) many strut standoff distances are vertically connected on and are winded up between truss bottom and Duo Gen drag-line;
4) by many drag-lines of root stretch-draw, tension sequence is: a drag-line in the middle of pretensioning, and then two drag-lines in simultaneous tension outside are fixed many drag-line sealing off and covering anchorages after the initial prestress value F of drag-line reaches design load, form thus a Pin truss string structure;
5) on construction ground by after a Pin truss string structure hoisted in position by its two ends respectively be arranged on the structural fixed-hinged support of supported on both sides and be connected with the upper end of sliding hinge bearing, and impose temporary supporting;
6) after the whole rigging outs of many Pin truss string structure, between truss, many cross struts be set and form truss string structure roof structure winding up of adjacent truss string structure, to ensure the lateral stability of truss-string-structure, remove temporary supporting, construct complete.
Highly redundant degree truss-string-structure provided by the invention and implementation method tool have the following advantages:
1) indoor headroom takies few: many string ropes are connected on the bottom ball node of the truss that winds up, and the rise of span centre position is reduced greatly, have saved indoor headroom.
2) security performance improves: in the time in many drag-lines a certain there is fracture, the internal force of other drag-line increases, and can be delayed it and is collapsed by wind up mode that truss is out of shape of increases, for the evacuation of personnel and property provides the quality time.
Brief description of the drawings
Fig. 1 is highly redundant degree truss-string-structure front view provided by the invention.
Fig. 2 is the unidirectional truss string structure roof structure stereogram being made up of highly redundant degree truss-string-structure provided by the invention.
Fig. 3 is traditional truss-string-structure and highly redundant degree truss-string-structure provided by the invention span centre displacement changing curve under Vertical Seismic Load effect.
Fig. 4 is that traditional truss-string-structure and highly redundant degree truss-string-structure provided by the invention are at Vertical Seismic Load effect downhaul internal force change curve.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, highly redundant degree truss-string-structure provided by the invention and implementation method are elaborated.
As shown in Figure 1, highly redundant degree truss-string-structure provided by the invention comprises the truss 1 that winds up, many struts 2, many drag-lines 3, fixed-hinged support 4 and sliding hinge bearings 5, the truss 1 that wherein winds up serve as reasons many wind up truss member 6 by bolt sphere or solder sphere interconnect form just put pyrometric cone space arch truss; The two ends standoff distance of every drag-line 3 is connected on two ball nodes of truss 1 bottom of winding up, and the part-structure of many drag-lines 3 is crisscross arranged; Many strut 2 standoff distances are vertically connected on and wind up between truss 1 bottom and Duo Gen drag-line 3; The upper end of fixed-hinged support 4 is connected with the ball node of truss 1 one side lower parts that wind up, and lower end is arranged in the braced structures that is positioned at truss 1 one sides of winding up in a fixed manner; The upper end of sliding hinge bearing 5 is connected with the ball node of the truss 1 opposite side bottom of winding up, and lower end is arranged in the braced structures that is positioned at truss 1 opposite side that winds up in the mode of sliding.
The quantity of described drag-line 3 is three, and the outer end that is positioned at outermost two drag-lines 3 is connected with the ball node of the 1 liang of side lower part of truss that winds up respectively.
Now as an example of the unidirectional truss string structure roof structure of highly redundant degree that formed by 7 Pin truss string structures 7 example, the implementation method of highly redundant degree truss-string-structure provided by the invention is described, spacing on this unidirectional truss string structure roof structure between truss string structure 7 is 8m, longitudinally overall length 48m, adjacent winding up established cross struts 8 between truss 1.The span of single Pin truss string structure 7 is 100m, the kiln crown 6m that winds up, and many drag-line 3 sags are 2m, and many drag-lines 3 are parabolic shape.The two ends of every Pin truss string structure 7 are respectively fixed-hinged support 4 and sliding hinge bearing 5, and absolute altitude is 20.0m, and as shown in Figure 2, described implementation method comprises the following step carrying out in order:
1) according to section area and the corresponding initial prestress value F of the length of wind up in the restriction of structural span, interior net storey height and Load Combination operating condition design highly redundant degree truss-string-structure truss member 6 and strut 2 and sectional dimension, many drag-lines 3;
2) by bolt sphere or solder sphere connected mode, the many truss members 6 that wind up are interconnected to the truss 1 that winds up;
3) many struts 2 standoff distances are vertically connected on and are winded up between truss 1 bottom and Duo Gen drag-line 3;
4) by many drag-lines of root stretch-draw 3, tension sequence is: a drag-line 3 in the middle of pretensioning, and then two drag-lines 3 in simultaneous tension outside are fixed many drag-lines 3 sealing off and covering anchorages after the initial prestress value F of drag-line 3 reaches design load, form thus a Pin truss string structure 7;
5) on construction ground by after Pin truss string structure 7 hoisted in position by its two ends respectively be arranged on the structural fixed-hinged support 4 of supported on both sides and be connected with the upper end of sliding hinge bearing 5, and impose temporary supporting;
6) after the whole rigging outs of many Pin truss string structure 7, between truss 1, many cross struts 8 are set and formation truss string structure roof structure winding up of adjacent truss string structure 7, to ensure the lateral stability of truss-string-structure, remove temporary supporting, construct complete.
In order to verify the anti-seismic performance of highly redundant degree truss-string-structure provided by the invention, the inventor has utilized finite element software Modeling Calculation, and traditional truss-string-structure and highly redundant degree truss-string-structure provided by the invention are made used time structure span centre maximum displacement change curve and drag-line 6 internal force change curves at EL-Centro (1940) ripple Vertical Seismic Load, 400 load steps, load time 8s, the results are shown in Figure 3 and Fig. 4.Visible, highly redundant degree truss-string-structure provided by the invention still can reliably working under seismic loading, and has the anti-seismic performance outstanding compared with traditional structure.
As can be seen here, the present invention is theoretical reliable, use safety, and implementation method is easy, and effect significantly and be convenient to practical application.
Claims (3)
1. a highly redundant degree truss-string-structure, it is characterized in that: described highly redundant degree truss-string-structure comprises the truss that winds up (1), many struts (2), many drag-lines (3), fixed-hinged support (4) and sliding hinge bearing (5), the truss (1) that wherein winds up serve as reasons many wind up truss member (6) by bolt sphere or solder sphere interconnect form just put pyrometric cone space arch truss; The two ends standoff distance of every drag-line (3) is connected on two ball nodes of the truss that winds up (1) bottom, and the part-structure of many drag-lines (3) is crisscross arranged; Many struts (2) standoff distance is vertically connected between the truss that winds up (1) bottom and Duo Gen drag-line (3); The upper end of fixed-hinged support (4) is connected with the ball node of truss (1) one side lower part that winds up, and lower end is arranged in the braced structures that is positioned at truss (1) one side of winding up in a fixed manner; The upper end of sliding hinge bearing (5) is connected with the ball node of the truss that winds up (1) opposite side bottom, and lower end is arranged in the braced structures that is positioned at the truss that winds up (1) opposite side in the mode of sliding.
2. highly redundant degree truss-string-structure according to claim 1, it is characterized in that: the quantity of described drag-line (3) is three, and the outer end that is positioned at outermost two drag-lines (3) is connected with the ball node of truss (1) two side lower part that winds up respectively.
3. an implementation method for highly redundant degree truss-string-structure as claimed in claim 1, is characterized in that: described implementation method comprises the following step carrying out in order:
1) according to section area and the corresponding initial prestress value F of the length of wind up in the restriction of structural span, interior net storey height and Load Combination operating condition design highly redundant degree truss-string-structure truss member (6) and strut (2) and sectional dimension, many drag-lines (3);
2) by bolt sphere or solder sphere connected mode, the many truss members that wind up (6) are interconnected to the truss that winds up (1);
3) many struts (2) standoff distance is vertically connected between the truss that winds up (1) bottom and Duo Gen drag-line (3);
4) by many drag-lines of root stretch-draw (3), tension sequence is: a drag-line (3) in the middle of pretensioning, then simultaneous tension two drag-lines in outside (3), after the initial prestress value F of drag-line (3) reaches design load, many drag-lines (3) sealing off and covering anchorage is fixed, formed thus a Pin truss string structure (7);
5) on construction ground by after Pin truss string structure (7) hoisted in position by its two ends respectively be arranged on the structural fixed-hinged support of supported on both sides (4) and be connected with the upper end of sliding hinge bearing (5), and impose temporary supporting;
6) after the whole rigging outs of many Pin truss string structure (7), many cross struts (8) are set between the truss that winds up (1) of adjacent truss string structure (7) and form truss string structure roof structure, to ensure the lateral stability of truss-string-structure, remove temporary supporting, construct complete.
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| CN111305465A (en) * | 2019-11-12 | 2020-06-19 | 成都容正软件有限公司 | Hoisting construction method for spoke type beam string structure |
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| CN2719960Y (en) * | 2004-07-12 | 2005-08-24 | 高维成 | Tensioned beam truss hanging light combined roofing structure |
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