CN110241971A - A prestressed composite steel structure component and its construction method - Google Patents
A prestressed composite steel structure component and its construction method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 139
- 239000010959 steel Substances 0.000 title claims abstract description 139
- 238000010276 construction Methods 0.000 title claims abstract description 15
- 239000002131 composite material Substances 0.000 title abstract description 32
- 238000009434 installation Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims 1
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- 239000013589 supplement Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000011513 prestressed concrete Substances 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
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- 230000007547 defect Effects 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/10—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal prestressed
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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Abstract
本发明涉及一种预应力组合钢结构构件及其施工方法，采用了预应力钢绞线(3)与钢梁的组合构件，钢梁的横断面采用了上下两个箱型断面叠合组成，预应力钢绞线(3)设置在钢梁断面的上箱型梁(1)内，通过张拉预应力钢绞线(3)提高新型预应力组合钢结构构件的变形能力，控制钢绞线的张拉力，使之可以平衡钢梁、预应力钢绞线的自重以及恒荷载产生的变形。与现有技术相比，本发明将预应力钢绞线与钢结构组合构件结合起来应用，预应力钢绞线在箱型梁之间张拉，避免了预应力钢绞线外露在钢结构构件外，结构自重轻、外观轻盈，并且解决了大跨度钢结构刚度的问题，大大提高预应力钢结构组合构件的抗变形能力。
The present invention relates to a prestressed combined steel structure member and a construction method thereof. The combined member of a prestressed steel strand (3) and a steel girder is used, and the cross section of the steel girder is formed by superimposing two upper and lower box sections. The prestressed steel strand (3) is arranged in the upper box girder (1) of the steel beam section, and the deformation capacity of the new prestressed composite steel structural member is improved by tensioning the prestressed steel strand (3), and the steel strand is controlled The tension force can balance the self-weight of steel beams and prestressed steel strands and the deformation caused by constant load. Compared with the prior art, the present invention combines the prestressed steel strands with the steel structure composite components, and the prestressed steel strands are stretched between the box girders, which avoids the prestressed steel strands being exposed to the steel structure components. In addition, the structure is light in weight and light in appearance, and solves the problem of rigidity of long-span steel structures, greatly improving the deformation resistance of prestressed steel structure composite members.
Description
技术领域technical field
本发明涉及工程结构技术领域，尤其是涉及一种预应力组合钢结构构件及其施工方法。The invention relates to the technical field of engineering structures, in particular to a prestressed composite steel structure component and a construction method thereof.
背景技术Background technique
传统上，预应力混凝土结构是在结构构件受外力荷载作用前，先人为地对它施加压力，由此产生的预应力状态用以减小或抵消外荷载所引起的拉应力，即借助于混凝土较高的抗压强度来弥补其抗拉强度的不足，达到推迟受拉区混凝土开裂的目的。与钢筋混凝土相比，预应力混凝土的优点：由于采用了高强度钢材和高强度混凝土，预应力混凝土构件具有抗裂能力强、刚度大、强度高的特点。Traditionally, prestressed concrete structures are artificially applied to the structural members before they are subjected to external loads, and the resulting prestressed state is used to reduce or offset the tensile stress caused by external loads, that is, by means of The higher compressive strength of concrete is used to make up for the lack of tensile strength, so as to delay the cracking of concrete in the tension area. Compared with reinforced concrete, the advantages of prestressed concrete: due to the use of high-strength steel and high-strength concrete, prestressed concrete members have the characteristics of strong crack resistance, high rigidity, and high strength.
预应力钢结构是指在结构上施加荷载以前，对钢结构或构件用特定的方法预加初应力，其应力符号与荷载引起的应力符号相反；当施加荷载时，以保证结构的安全和正常使用。结构或构件先抵消初应力，而且还应考虑预应力的作用，然后再按照一般受力情况工作的钢结构称为预应力钢结构。主要应用于大跨结构上，如体育场馆、会展中心、剧院、等大型公共建筑中，此外在张弦梁结构以及拉索结构中也有广泛应用。Prestressed steel structure means that before the load is applied to the structure, the steel structure or components are prestressed by a specific method, and the stress sign is opposite to the stress sign caused by the load; when the load is applied, to ensure the safety and normality of the structure use. The structure or component first offsets the initial stress, and the effect of prestress should also be considered, and then the steel structure that works according to the general stress situation is called prestressed steel structure. It is mainly used in large-span structures, such as stadiums, convention centers, theaters, and other large public buildings. In addition, it is also widely used in tension beam structures and cable structures.
发明内容Contents of the invention
本发明的目的就是为了克服上述现有技术存在的缺陷而提供一种预应力组合钢结构构件及其施工方法。The object of the present invention is to provide a prestressed composite steel structure component and its construction method in order to overcome the above-mentioned defects in the prior art.
本发明的目的可以通过以下技术方案来实现：The purpose of the present invention can be achieved through the following technical solutions:
一种预应力组合钢结构构件，包括钢梁，以及设置在钢梁内的预应力钢绞线。A prestressed composite steel structure component includes steel girders and prestressed steel strands arranged in the steel girders.
进一步的，所述钢梁为由上箱型梁和下箱型梁上下叠合而成的双层箱型梁，以及设置在上箱型梁断面内的预应力钢绞线。Further, the steel girder is a double-layer box girder formed by superimposing an upper box girder and a lower box girder up and down, and a prestressed steel strand arranged in the section of the upper box girder.
更进一步的，所述下箱型梁和上箱型梁的高度比为3:1。Furthermore, the height ratio of the lower box girder to the upper box girder is 3:1.
进一步的，所述预应力钢绞线的抗拉强度为fpy＝1570N/mm2。Further, the tensile strength of the prestressed steel strand is f py =1570N/mm 2 .
进一步的，所述预应力钢绞线的规格为3-7φs15.24。Further, the specification of the prestressed steel strand is 3-7φ s 15.24.
进一步的，所述预应力钢绞线的张拉力平衡钢梁、预应力钢绞线的自重以及恒荷载产生的变形。Further, the tensile force of the prestressed steel strand balances the self-weight of the steel beam, the prestressed steel strand, and the deformation caused by the constant load.
一种预应力钢结构组合构件的设计方法。步骤为：A design method for prestressed steel structure composite members. The steps are:
1)确定预应力钢结构组合构件的梁断面、预应力钢绞线设计；1) Determine the beam section and prestressed steel strand design of the prestressed steel structure composite member;
2)根据规范进行预应力钢结构组合构件强度、刚度、稳定性、施工过程验算。2) Check the strength, stiffness, stability, and construction process of prestressed steel structure composite members according to the specifications.
一种预应力组合钢结构构件的施工方法，具体步骤如下：A construction method of a prestressed composite steel structure member, the specific steps are as follows:
(a)工厂内加工钢结构组合构件，加工下料完成后进行预应力的一次张拉；(a) Steel structure composite components are processed in the factory, and prestressed primary tension is performed after the processing and blanking are completed;
(b)将预应力钢结构组合构件进行拼装，形成吊装单元；(b) Assembling the prestressed steel structure composite components to form a hoisting unit;
(c)将预应力钢结构组合构件吊装单元运至施工现场，进行现场安装；(c) Transport the hoisting unit of the prestressed steel structure composite member to the construction site for on-site installation;
(d)将预应力钢结构组合构件上的预应力钢绞线进行二次张拉；(d) Secondary tensioning of the prestressed steel strands on the prestressed steel structure composite member;
(e)现场所有结构安装完毕后，进行预应力钢结构组合构件上的预应力钢绞线的补充张拉。(e) After all the structures on site are installed, supplementary tensioning of the prestressed steel strands on the prestressed steel structure composite members is carried out.
进一步的，步骤(a)中：一次张拉是将钢绞线张拉至可以抵消钢梁及其上预应力钢绞线的自重荷载工况下的拉力。Further, in step (a): the primary tension is to stretch the steel strand to the tension that can offset the self-weight load condition of the steel beam and the prestressed steel strand on it.
进一步的，步骤(d)中：二次张拉使之可以平衡钢梁、预应力钢绞线的自重以及恒荷载产生的变形80％的控制应力(即0.80σcon)。Further, in step (d): secondary tensioning can balance the self-weight of the steel beam, the prestressed steel strand, and the control stress of 80% of the deformation caused by the constant load (ie 0.80σ con ).
进一步的，步骤(e)中：补充张拉使之可以平衡钢梁、预应力钢绞线的自重以及恒荷载产生的变形100％的控制应力(即1.00σcon)。Further, in step (e): Supplementary tensioning can balance the self-weight of steel beams, prestressed steel strands and 100% control stress (ie 1.00σ con ) of deformation caused by constant load.
进一步的，在一次张拉和二次张拉之间，可进行预张拉，将钢绞线张拉使之可以平衡钢梁、预应力钢绞线的自重以及恒荷载产生的变形40％的控制应力(即0.4σcon)。Further, between the primary stretching and the secondary stretching, pre-tensioning can be carried out, and the steel strand is stretched so that it can balance the self-weight of the steel beam, the prestressed steel strand, and the deformation of 40% of the constant load. Control stress (ie 0.4σ con ).
张拉工艺为：0→0.4σcon→测量箱形钢梁变形情况及标高→0.80σcon→1.00σcon→第二次测量箱形钢梁变形情况及标高。The tensioning process is: 0 → 0.4σ con → measure the deformation and elevation of the box-shaped steel beam → 0.80σ con → 1.00σ con → measure the deformation and elevation of the box-shaped steel girder for the second time.
采用预应力钢绞线分步张拉的方式，使之可以分阶段平衡钢梁、钢绞线的自重以及恒荷载产生的变形，有效地控制钢结构的挠度，拉索预应力的设置考虑可以平衡钢梁、钢绞线的自重以及恒荷载产生的变形。The prestressed steel strand is stretched step by step, so that it can balance the steel beam, the self-weight of the steel strand and the deformation caused by the constant load in stages, and effectively control the deflection of the steel structure. The setting of the cable prestress can be considered Balance the self-weight of steel beams and steel strands and the deformation caused by constant load.
将预应力钢绞线与钢结构组合构件结合起来应用，预应力钢绞线在箱型梁之间张拉，避免了预应力钢绞线外露在钢结构构件外，结构自重轻、外观轻盈，并且解决了大跨度钢结构刚度的问题，大大提高预应力钢结构组合构件的抗变形能力。The prestressed steel strand is combined with the steel structure composite member, and the prestressed steel strand is stretched between the box girders, which avoids the prestressed steel strand from being exposed outside the steel structural member, and the structure is light in weight and light in appearance. And it solves the problem of the rigidity of the long-span steel structure, and greatly improves the deformation resistance of the prestressed steel structure composite member.
与现有技术相比，本发明具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
1.适应于大跨度的钢结构体系，结构自重轻、外观轻盈。1. It is suitable for large-span steel structure system, with light structure and light appearance.
2.将预应力钢绞线与钢结构组合构件相结合，具有较好的平面内结构刚度。2. Combining prestressed steel strands with steel structural composite members has better in-plane structural rigidity.
3.新型预应力组合钢结构构件体系，其特征在于可以通过张拉钢绞线提高新型预应力组合钢结构构件的变形能力。3. A new type of prestressed composite steel structure component system, which is characterized in that the deformation capacity of the new type of prestressed composite steel structure component can be improved by tensioning steel strands.
4.通过控制钢绞线的张拉力，使之可以平衡钢梁、钢绞线的自重以及恒荷载产生的变形。4. By controlling the tension of steel strands, it can balance the self-weight of steel beams and steel strands and the deformation caused by constant load.
5.现场安装方便，同时采用分布张拉钢绞线的方法，便于控制结构构件的变形。5. It is easy to install on site, and at the same time, the method of distributing tensioned steel strands is adopted to facilitate the control of deformation of structural components.
附图说明Description of drawings
图1新型预应力组合构件剖面图；Figure 1 Sectional view of the new prestressed composite member;
图2新型预应力组合构件断面图；Figure 2 Sectional view of the new prestressed composite member;
图3本发明实施例子的剖面布置图；The sectional arrangement diagram of Fig. 3 embodiment example of the present invention;
图4本发明实施例在自重作用下的变形图；Figure 4 is a deformation diagram of the embodiment of the present invention under the action of its own weight;
图5本发明实施例在恒荷载和活荷载同时作用下的变形图；Fig. 5 is a deformation diagram of an embodiment of the present invention under the simultaneous action of dead load and live load;
图6本发明实施例在恒荷载、活荷载和预应力同时作用下的变形图。Fig. 6 is a deformation diagram of the embodiment of the present invention under the simultaneous action of dead load, live load and prestress.
图中标号所示：The numbers in the figure indicate:
1、上箱型梁，2、下箱型梁，3、预应力钢绞线。1. Upper box girder, 2. Lower box girder, 3. Prestressed steel strand.
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明进行详细说明。The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
实施例1Example 1
一种预应力组合钢结构构件，包括钢梁，以及设置在钢梁内的预应力钢绞线。钢梁为由上箱型梁1和下箱型梁2上下叠合而成的双层箱型梁，以及设置在上箱型梁2断面内的预应力钢绞线3。A prestressed composite steel structure component includes steel girders and prestressed steel strands arranged in the steel girders. The steel girder is a double-layer box girder formed by stacking an upper box girder 1 and a lower box girder 2 up and down, and a prestressed steel strand 3 arranged in the section of the upper box girder 2 .
某屋面采用大悬挑钢结构，最大净悬挑处约12m，钢结构梁间距约为9m。考虑到屋面梁的大悬挑，以及建筑上对于断面高度的要求，采用了双层箱型断面梁，并于上箱型梁1内设置钢结构预应力钢绞线3，预应力钢绞线规格采用3-7φs15.24,面积为2919mm2，抗拉强度fpy＝1570N/mm2。A roof adopts a large overhang steel structure, the maximum clear overhang is about 12m, and the distance between steel structure beams is about 9m. Considering the large overhang of the roof beam and the requirements for the section height in the building, a double-layer box-shaped section beam is adopted, and a steel structure prestressed steel strand 3 is installed in the upper box-shaped beam 1, and the prestressed steel strand The specification adopts 3-7φ s 15.24, the area is 2919mm 2 , and the tensile strength f py =1570N/mm 2 .
具体施工方法如下：The specific construction method is as follows:
1)工厂内加工钢结构组合构件，加工下料完成后进行预应力的一次张拉，将预应力钢绞线3张拉至可以抵消考虑钢梁及其上预应力钢绞线3的自重荷载工况下的拉力。1) The steel structure composite components are processed in the factory, and the prestressed steel strand is stretched once after the processing and blanking is completed, and the prestressed steel strand is stretched to offset the self-weight load of the steel beam and the upper prestressed steel strand 3 Pull force under working conditions.
2)将预应力钢结构组合构件进行拼装，形成吊装单元。2) Assemble the prestressed steel structure composite components to form a hoisting unit.
3)将预应力钢结构组合构件吊装单元运至施工现场，进行现场安装。3) Transport the hoisting unit of the prestressed steel structure composite member to the construction site for on-site installation.
4)将预应力钢结构组合构件上的预应力钢绞线3二次张拉，使之可以平衡钢梁、预应力钢绞线3的自重以及恒荷载产生的变形80％的控制应力(即0.80σcon)。4) Secondary stretching of the prestressed steel strand 3 on the prestressed steel structure composite member, so that it can balance the self-weight of the steel beam, the prestressed steel strand 3 and the control stress of 80% of the deformation produced by the constant load (ie 0.80σ con ).
5)现场所有结构安装完毕后，进行预应力钢结构组合构件上的预应力钢绞线3的补充张拉，使之可以平衡钢梁、预应力钢绞线3的自重以及恒荷载产生的变形100％的控制应力(即1.00σcon)。5) After all the structures on site are installed, supplementary tensioning of the prestressed steel strand 3 on the prestressed steel structure composite member is carried out, so that it can balance the self-weight of the steel beam and the prestressed steel strand 3 and the deformation caused by the constant load 100% control stress (ie 1.00σ con ).
如图4所示，预应力钢结构组合构件在自重作用下，挠度的最大值为50mm；如图5所示，预应力钢结构组合构件在恒荷载和活荷载同时作用下，挠度的最大值为213mm；如图6所示，预应力钢结构组合构件在恒荷载、活荷载和预应力同时作用下，挠度的最大值为82mm，说明了本发明应用达到设计效果。As shown in Figure 4, the maximum deflection of the prestressed steel composite member is 50 mm under the action of its own weight; as shown in Figure 5, the maximum deflection of the prestressed steel composite member is is 213mm; as shown in Figure 6, the maximum deflection of the prestressed steel composite member is 82mm under the simultaneous action of dead load, live load and prestress, which shows that the application of the present invention achieves the design effect.
上述的对实施例的描述是为便于该技术领域的普通技术人员能理解和使用发明。熟悉本领域技术的人员显然可以容易地对这些实施例做出各种修改，并把在此说明的一般原理应用到其他实施例中而不必经过创造性的劳动。因此，本发明不限于上述实施例，本领域技术人员根据本发明的揭示，不脱离本发明范畴所做出的改进和修改都应该在本发明的保护范围之内。The above descriptions of the embodiments are for those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the present invention is not limited to the above-mentioned embodiments. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.
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