Novel U-shaped steel plate energy consumption support
阅读说明：本技术 一种新型u形钢板耗能支撑 (Novel U-shaped steel plate energy consumption support ) 是由 彭晓彤 付晓凡 林晨 蔡春水 杨涛春 李雁军 陈圣刚 于 2019-11-22 设计创作，主要内容包括：本发明提供了一种新型U形钢板耗能支撑,属于建建筑抗震领域。由外套筒、内部钢板和两组对称U形元件构成,其特征在于：每个所述U形元件分别通过单边螺栓与所述外套筒连接,每个所述U形元件分别通过普通螺栓与所述内部钢板连接,所述内部钢板外伸构成一侧连接板一,所述外套筒与端部盖板焊接,连接板二与所述端部盖板焊接,整体结构通过螺栓与所述钢框架连接。本发明克服人字形支撑U形阻尼装置的缺点,便于在支撑损坏后进行更换,维修成本较低。(The invention provides a novel U-shaped steel plate energy-consuming support, and belongs to the field of earthquake resistance of buildings. Constitute by outer sleeve, inside steel sheet and two sets of symmetrical U-shaped component, its characterized in that: each U-shaped element is connected with the outer sleeve through a single-side bolt, each U-shaped element is connected with the inner steel plate through a common bolt, the inner steel plate extends outwards to form a first connecting plate on one side, the outer sleeve is welded with the end cover plate, a second connecting plate is welded with the end cover plate, and the whole structure is connected with the steel frame through bolts. The invention overcomes the defects of the herringbone supporting U-shaped damping device, is convenient to replace after the support is damaged, and has lower maintenance cost.)
1. A novel U-shaped steel plate energy-consuming support is used for being connected to a steel structure frame in a building to form an energy-consuming component, and is composed of an outer sleeve (1), an inner steel plate (2) and two groups of symmetrical U-shaped elements (3), and is characterized in that: each U-shaped element (3) is connected with the outer sleeve (1) through a single-side bolt (8), each U-shaped element (3) is connected with the inner steel plate (2) through a common bolt (9), the inner steel plate (2) extends outwards to form a first side connecting plate (4), the outer sleeve (1) is welded with an end cover plate (7), a second connecting plate (5) is welded with the end cover plate (7), and the whole structure is connected with the steel frame through a bolt (6);
the outer sleeve (1) is a square steel pipe;
a certain interval is reserved between the inner steel plate (2) and the outer sleeve (1) so as to meet the requirement of limiting the influence of the outer pipe on an axial bearing system;
the two groups of symmetrical U-shaped elements (3) are respectively and uniformly arranged in a containing cavity formed by the inner steel plate (2) and the outer sleeve (1);
two groups of symmetrical U-shaped elements (3) are arranged in a bidirectional way;
the two U-shaped elements (3) with opposite openings form a group of energy dissipation dampers;
two groups of symmetrical U-shaped elements (3) are respectively arranged along the length direction of the support and are symmetrically distributed around the inner steel plate (2).
2. The new U-shaped steel plate energy consuming support of claim 1, wherein: the structural component of the U-shaped element (3) must be firstly subjected to plasticity by a steel frame structure, and Q235 steel with low yield point and capable of absorbing a large amount of energy is adopted;
the U-shaped element (3) is U-shaped in cross section and comprises an upper straight line part, a semicircular part and a lower straight line part, wherein the upper straight line part and the lower straight line part are symmetrically distributed relative to the U-shaped element (3), and the lengths of the upper straight line part and the lower straight line part are the same;
the upper straight line part, the semicircular part and the lower straight line part of the U-shaped element (3) are equal in thickness.
3. The new U-shaped steel plate energy consuming support of claim 1, wherein: one end of the first connecting plate (4) is semicircular, a threaded hole is formed in the first connecting plate (4), and the first connecting plate is hinged to the steel frame through the bolt (6);
one end of the second connecting plate (5) is semicircular, a threaded hole is formed in the second connecting plate (5), and the bolt (6) is hinged to the steel frame.
4. The new U-shaped steel plate energy consuming support of claim 1, wherein: the outer sleeve (1), the inner steel plate (2), the first connecting plate (4), the second connecting plate (5) and the end cover plate (7) are in an elastic stage under the action of a limit force, so that plastic damage is concentrated on the U-shaped element (3).
5. The new U-shaped steel plate energy consuming support of claim 1, wherein: the novel U-shaped steel plate energy consumption support adopts a herringbone support or a single-inclined-rod support mode arranged in pairs, and the included angle between the support and the steel frame column is 35-55 degrees.
6. The new U-shaped steel plate energy consuming support of claim 1, wherein: the number of the novel U-shaped steel plate energy consumption supports is n, and n is an even number:
wherein theta is an included angle between the novel U-shaped steel plate energy consumption support and the steel frame column;
h is the frame layer height.
7. The new U-shaped steel plate energy consuming support of claim 6, wherein: thickness of the U-shaped element (3)
Wherein, F1The support bears external force under the condition of multiple earthquakes;
fythe yield strength of steel;
F2the support bears external force under the condition of rare earthquake;
b is the width of the U-shaped element;
radius of the U-shaped element (3)
Where D is the height of the U-shaped member.
8. The new U-shaped steel plate energy consuming support of claim 7, wherein: should carry out the displacement checking calculation after accomplishing novel U-shaped steel sheet energy consumption support design, should satisfy:
wherein, ω is1The maximum elastic interlayer displacement of the U-shaped steel plate energy consumption support is achieved;
ω2the maximum elastic interlayer displacement of the U-shaped steel plate energy consumption support is achieved;
Δethe elastic limit displacement of the energy consumption support of the U-shaped steel plate;
Δuthe ultimate yield displacement of the energy-consuming support of the U-shaped steel plate;
[θe]the displacement angle limit value between the elastic layers is obtained, and the value of the multi-layer and high-layer steel structure is 1/250;
h is the floor height.
Technical Field
The invention belongs to the field of building earthquake resistance, and particularly relates to a novel U-shaped steel plate energy-consuming support.
Background
Under the action of earthquake, the buckling phenomenon can be generated when the common support is pressed, when the support is pressed and buckled, the rigidity and the bearing capacity are sharply reduced, the internal force of the support is changed in a reciprocating mode under the pressed state and the pulled state, and the hysteresis performance of the support is poor. In order to solve the problem that the common support is poor in buckling under pressure and hysteretic performance, a sleeve is arranged outside the support to restrain buckling of the support to form the buckling-restrained energy-dissipation support, and the application of the buckling-restrained energy-dissipation support can comprehensively improve the seismic performance of the traditional support under the action of an earthquake. The buckling-restrained energy-dissipation brace does not yield under the action of small earthquake, only provides additional rigidity, yields under the action of medium earthquake or large earthquake, provides additional rigidity and additional damping, can be used for buildings with higher requirements or special requirements on earthquake-resistant safety and use, and is suitable for high-intensity multi-story and high-rise buildings and large-span structures.
Steel becomes one of the best materials for manufacturing the damper because of the stable post-yield energy consumption capability and the good plastic deformation capability, wherein the mild steel damper is widely researched and applied at home and abroad because of the characteristics of good low-cycle fatigue performance, excellent and stable hysteresis performance, more flexible application range, no temperature influence on performance and the like, and is more representative of a U-shaped steel plate damper. The U-shaped steel plate damper technology is based on metal laths, and U-shaped elements of the U-shaped steel plate damper technology are obtained by cold bending of the laths and comprise three parts: upper straight line portion, semicircle portion, lower straight line portion. When the upper part and the lower part of the damper generate relative displacement, the upper linear part and the lower linear part respectively extend or shorten, the linear part of the damper is subjected to tension bending or bending stress, the semicircular part is mainly in a shearing stress state, and when the U-shaped steel plate damper enters a plastic yield state from an elastic state, the damper begins to exert an energy consumption function. During an earthquake, the U-shaped steel plate damper must enter plastic state before structural members such as beams and columns, and must enter plastic state at a stress level expected by design. The U-shaped steel plate has the advantages that the curvatures of the yielding areas are uniformly distributed in the low-cycle reciprocating motion process, stress concentration of a certain section is effectively avoided, the length of the yielding areas in the traditional bending-resistant member is not related to displacement, the total length of the yielding areas of the U-shaped steel plate is equal to the relative displacement between the upper plate and the lower plate, and under the action of large shock, the larger the relative displacement between the upper plate and the lower plate is, the more fully the materials can be utilized.
A typical method of providing a U-shaped steel plate damper in the structural frame is to place it between the chevron support and the upper frame beam. For buildings using U-shaped steel plate dampers, the damping is usually increased by increasing the width of the U-shaped elements, but there is generally not enough space in the structure for mounting the damping device. In practical application, the U-shaped steel plate damper not only needs to bear horizontal load, but also needs to bear vertical load, and the vertical load can influence the normal work of the U-shaped element, so that the U-shaped element can not fully play the role.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a novel U-shaped steel plate energy-consuming support, which belongs to a bending-resistant energy-consuming device, has low manufacturing cost and is relatively easy to realize.
The invention is realized by the following technical scheme:
the utility model provides a novel U-shaped steel sheet energy consumption supports for be connected to steel structural framework in the building and form the power consumption component, comprises outer sleeve, inside steel sheet and two sets of symmetrical U-shaped components, its characterized in that: each U-shaped element is connected with the outer sleeve through a single-side bolt, each U-shaped element is connected with the inner steel plate through a common bolt, the inner steel plate extends outwards to form a first connecting plate at one side, the outer sleeve is welded with the end cover plate, a second connecting plate is welded with the end cover plate, and the whole structure is connected with the steel frame through a bolt;
the outer sleeve is a square steel pipe;
a certain interval is reserved between the inner steel plate and the outer sleeve so as to meet the requirement of limiting the influence of the outer pipe on an axial bearing system;
the two groups of symmetrical U-shaped elements are respectively and uniformly arranged in a containing cavity formed by the inner steel plate and the outer sleeve;
the two groups of symmetrical U-shaped elements are arranged in a bidirectional mode;
the two U-shaped elements with opposite openings form a group of energy dissipation dampers;
two groups of symmetrical U-shaped elements are respectively arranged along the length direction of the support and are symmetrically distributed around the inner steel plate.
The U-shaped element must firstly make the structural member of the steel frame structure plastic, and adopts Q235 steel which has low yield point and absorbs a large amount of energy;
the cross section of the U-shaped element is U-shaped and comprises an upper straight line part, a semicircular part and a lower straight line part, the upper straight line part and the lower straight line part are symmetrically distributed relative to the U-shaped element, and the lengths of the upper straight line part and the lower straight line part are the same;
the upper straight line part, the semicircular part and the lower straight line part of the U-shaped element are equal in thickness.
One end of the first connecting plate is semicircular, a threaded hole is formed in the first connecting plate, and the first connecting plate is hinged with the steel frame through the bolt;
one end of the second connecting plate is semicircular, a threaded hole is formed in the second connecting plate, and the second connecting plate is hinged to the steel frame through the bolt.
The outer sleeve, the inner steel plate, the first connecting plate, the second connecting plate and the end cover plate are in an elastic stage under the action of a limit force, so that plastic damage is concentrated on the U-shaped element.
The novel U-shaped steel plate energy consumption support adopts a herringbone support or a single-inclined-rod support mode arranged in pairs, and the included angle between the support and the steel frame column is 35-55 degrees.
The number of the novel U-shaped steel plate energy consumption supports is n, and n is an even number:
wherein theta is an included angle between the novel U-shaped steel plate energy consumption support and the steel frame column;
h is the frame layer height.
Thickness of the U-shaped member
Wherein, F1The support bears external force under the condition of multiple earthquakes;
fythe yield strength of steel;
F2the support bears external force under the condition of rare earthquake;
b is the width of the U-shaped element;
radius of the U-shaped element (3)
Where D is the height of the U-shaped member.
Should carry out the displacement checking calculation after accomplishing novel U-shaped steel sheet energy consumption support design, should satisfy:
wherein, ω is1The maximum elastic interlayer displacement of the U-shaped steel plate energy consumption support is achieved;
ω2the maximum elastic interlayer displacement of the U-shaped steel plate energy consumption support is achieved;
Δethe elastic limit displacement of the energy consumption support of the U-shaped steel plate;
Δuthe ultimate yield displacement of the energy-consuming support of the U-shaped steel plate;
[θe]the displacement angle limit value between the elastic layers is obtained, and the value of the multi-layer and high-layer steel structure is 1/250;
the displacement angle limit value between the elastic-plastic layers is obtained, and the value of the multi-layer and high-layer steel structure is 1/50;
h is the floor height.
Compared with the prior art, the invention has the beneficial effects that:
(1) overcomes the defect of the herringbone support U-shaped damping device. Axial force in the diagonal direction causes relative displacement between the inner steel plate and the outer sleeve, rolling bending movement of the U-shaped element is activated to consume energy, and influence of bidirectional load on normal work of the support is avoided.
(2) The two ends of the support are connected with the frame through bolts, so that the support can be replaced conveniently after being damaged.
(3) The structure can be realized by prefabrication, the time of site operation is reduced, the structure is simple, and the cost is low.
Drawings
Fig. 1 is a schematic diagram of the framework of the present invention.
Fig. 2 is a front view of fig. 1.
Fig. 3 is a top view of fig. 1.
Fig. 4 is a cross-sectional view taken at a-a in fig. 3.
Fig. 5 is a schematic diagram of component dimensions.
Figure 6 is a schematic drawing of the dimensions of a single U-shaped element.
Fig. 7 is a simplified calculation of the U-shaped element.
Figure 8 is an internal force diagram of the U-shaped member.
In the figure: 1. outer sleeve, 2, inner steel plate, 3, U-shaped element, 4, gusset plate, 5, gusset plate, 6, connecting bolt, 7, end cover plate, 8, unilateral bolt, 9, common bolt
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1-8, the new U-shaped steel plate energy consuming support of the present invention, which is used for connecting to a steel structural frame in a building to form an energy consuming member, is composed of an outer sleeve 1, an
the outer sleeve 1 is a square steel pipe;
a certain interval is reserved between the
the two groups of symmetrical
the two groups of symmetrical
the two
two symmetrical sets of said
The structural component of the
the cross section of the
the upper straight line part, the semicircular part and the lower straight line part of the
One end of the first connecting
one end of the second connecting
The outer sleeve 1, the
The outer sleeve 1, the
The novel U-shaped steel plate energy consumption support is suitable for residential buildings with intensity greater than 9 degrees and layer number greater than 7 layers.
The novel U-shaped steel plate energy consumption support adopts a herringbone support or a single-inclined-rod support mode arranged in pairs, and the included angle between the novel U-shaped steel plate energy consumption support and the steel frame column is 35-55 degrees.
The outer sleeve 1 is a seamless square steel tube.
As shown in figure 5, the outer sleeve 1 is a square steel tube with the outer side length of 620mm, the wall thickness of the square steel tube is 20mm, the thickness of the inner steel plate is 20mm, a certain gap is reserved between the square steel tube and the outer sleeve, and the distance is 10 mm.
It follows that the height and width of the
D＝280mm
b＝560mm
by substituting D into (equation 3), it is further obtained that the radius R of the
as shown in fig. 6, it is further obtained that the total length of the single
wherein L is the effective length of the U-shaped element, independent of the bearing capacity of the member, and the construction length is 250mm, and a is the length from the bolt to the edge of the U-shaped element, and the construction length is 60 mm.
The included angle between the novel U-shaped steel plate energy consumption support and the steel frame column is 35-55 degrees and is set as theta, the frame layer height is H, as shown in figure 1, and therefore the length of a single support is
The distance d between each
Thus, the number n of
in the formula, n is an even number.
(1) Under the condition of multi-occurrence earthquake
Under the condition of multiple earthquakes, the external force borne by the support is F1So that the single
wherein f isyThe yield strength of steel;
Mmaxthe maximum bending moment for the
Nmaxmaximum axial force for the
i is the bending-resistant moment of inertia of the section;
a is the cross-sectional area.
Further, the method can be obtained as follows:
the displacements that can be supported by calculation from the force diagram inside the
wherein E represents the elastic modulus of the steel material.
Therefore, the elastic limit displacement of the energy-consuming support of the U-shaped steel plate is as follows:
wherein epsilonyWhich represents the yield strain of the steel.
(2) In rare earthquake situations
In rare earthquake, the external force born by the support is F2So that the single
According to the elasto-plastic mechanics related theory, the plastic zone is gradually enlarged from the outermost layer fiber to the inside along with the increase of the external load. The plastic limit bearing capacity F of the single
due to t2＜＜R2Further obtaining the plastic limit bearing capacity FsComprises the following steps:
when F is present2/n＝FsWhen this occurs, plastic hinge is produced, so that F should be present2/n≤FsFurther, it can be obtained:
the ultimate yield displacement of the U-shaped steel plate energy consumption support is as follows:
studies have shown that normal use of the U-shaped element is affected when t is less than 10 mm. Thus,
in the building earthquake-resistant design specification, the formula of the maximum elastic interlayer displacement in the floor is calculated by checking earthquake deformation under the action of 5.5.1 earthquakes:
Δue≤[θe]h (formula 13)
Wherein, Δ ueThe displacement between the elastic layers is the largest displacement between the elastic layers in the floors generated by the standard value of the earthquake action.
The elastic maximum displacement of the energy-consuming support of the U-shaped steel plate along the supporting direction is obtained through calculation
in the building earthquake resistance design specification, an earthquake resistance deformation checking calculation structure weak layer (part) elastic-plastic interlayer displacement formula under the action of 5.5.5 rare earthquakes:
wherein, Δ upThe largest elastic interlaminar displacement in the floor generated by the rarely-encountered earthquake action standard value.
Calculating to obtain the ultimate yield displacement of the energy-consuming support of the U-shaped steel plate along the supporting direction
therefore, when the energy consumption support design of the U-shaped steel plate is completed, the displacement checking calculation is required to be carried out, and the
the invention overcomes the defects of the herringbone supporting U-shaped damping device, is convenient to replace after the support is damaged, and has lower maintenance cost.
The above-described embodiment is only one embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be easily made based on the application and principle of the present invention disclosed in the present application, and the present invention is not limited to the method described in the above-described embodiment of the present invention, so that the above-described embodiment is only preferred, and not restrictive.
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