A trapezoidal corrugated web steel arch with unequal upper and lower wave heights and a processing method

Abstract

The application discloses a trapezoidal corrugated web steel arch with unequal upper and lower wave heights, wherein the trapezoidal corrugated webs are connected with upper and lower flange plates through welds to form the trapezoidal corrugated web steel arch, and the upper edge of the trapezoidal corrugated web has a large wavelength and a small wave height, and the lower edge of the trapezoidal corrugated web has a small wavelength and a large wave height.The trapezoidal corrugated web steel arch has the advantages of convenient processing, steel saving and suitability for arch-shaped steel structures with various spans.

Description

Technical Field

[0001] This invention relates to the field of structural engineering technology, and in particular to a trapezoidal corrugated web steel arch with unequal upper and lower wave heights and its processing method. Background Technology

[0002] Arched steel structures can transform vertical loads into compressive loads along the arch axis, improving the cross-sectional stress performance and material utilization efficiency. I-shaped steel arches are widely used in roof structures, warehouse structures, and tunnel support structures. However, I-shaped steel arches have shortcomings in terms of stress performance and fabrication. Regarding stress performance, the flat web used in I-shaped steel arches is prone to local buckling under the combined effects of cross-sectional pressure, bending moment, and shear force. To ensure the local stability of the flat web, it is necessary to increase the web thickness or add a large number of stiffening ribs, leading to increased steel consumption and welding workload. In terms of fabrication, the flat web of I-shaped steel arches is usually obtained by cutting steel plates into arch shapes, which generates steel scraps and results in material waste.

[0003] To address the local stability issue of the flat web in I-shaped steel arches, replacing the flat web with a trapezoidal corrugated web is an effective measure. CN217326094U proposes a trapezoidal corrugated web steel arch. According to the specific implementation, an arch-shaped flat steel plate needs to be cut before molding, which results in steel scrap waste. This is an area that this application needs to focus on improving. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a trapezoidal corrugated web steel arch with unequal upper and lower wave heights, which does not produce steel scrap and saves steel.

[0005] To solve the above technical problems, the present invention provides a trapezoidal corrugated web steel arch with unequal upper and lower wave heights, comprising a trapezoidal corrugated web with a curved axis, a cold-formed upper flange plate and a lower flange plate. The trapezoidal corrugated web plate is connected to the upper flange plate and the lower flange plate by welds to form a trapezoidal corrugated web steel arch. The waveform of the trapezoidal corrugated web plate is trapezoidal, with a large wavelength and small wave height at the upper edge of the web plate, and a small wavelength and large wave height at the lower edge of the web plate.

[0006] The edges of the trapezoidal corrugated web are perpendicular to the arch axis.

[0007] The thickness of the trapezoidal corrugated web ranges from 3 to 30 mm.

[0008] This invention also provides a method for processing a trapezoidal corrugated web steel arch with unequal upper and lower wave heights, comprising the following steps:

[0009] Step S1: Based on the cross-sectional dimensions, span, and rise-to-span ratio of the trapezoidal corrugated web steel arch, determine the wavelength and wave height of the upper edge and the lower edge of the trapezoidal corrugated web, and then make the upper and lower molding dies according to the dimensions of the trapezoidal corrugated web.

[0010] Define coefficients k1 and k2:

[0011] k1 = r1 / r0 > 1;

[0012] k2 = r2 / r0 < 1;

[0013] The waveform dimensions have the following relationship:

[0014]

[0015]

[0016] Where: a: wave amplitude relative to the corrugated axis, i.e., half the wave height; b: width of the horizontal strip in the trapezoidal corrugation; d: horizontal projection width of the inclined strip in the trapezoidal corrugation; h: wave height of the trapezoidal corrugation; r0: radius of curvature corresponding to the arch axis; r1: radius of curvature corresponding to the upper flange arc; r2: radius of curvature corresponding to the lower flange arc; s: unfolded length of the trapezoidal corrugation; λ: wavelength of the trapezoidal corrugation.

[0017] Subscript 0: Indicates the waveform dimensions (s0, b0, d0, a0, λ0) at the position of the arch axis;

[0018] Subscript 1: indicates the waveform size (s1, b1, d1, a1, λ1) of the upper edge of the web;

[0019] Subscript 2: indicates the waveform dimensions (s2, b2, d2, a2, λ2) of the lower edge of the web;

[0020] Step S2: Place the flat rectangular steel plate on the lower die and fix the rectangular steel plate with clamps;

[0021] Step S3: The upper die presses downwards, so that the rectangular steel plate and the lower die fit together completely, pressing the rectangular steel plate to form the first trapezoidal corrugation;

[0022] Step S4: Raise the clamp and the upper die, move the trapezoidal corrugations pressed in the previous step forward and place them into the positioning slot of the lower die, and place the rectangular steel plate on the lower die again.

[0023] Step S5: Fix the rectangular steel plate with a clamp, press the upper die downward to make the rectangular steel plate fit with the lower die, and press the rectangular steel plate to form the next trapezoidal corrugation.

[0024] Step S6: Repeat steps S4 and S5 to obtain a trapezoidal corrugated web with unequal upper and lower wave heights, wherein the axis of the trapezoidal corrugated web is curved.

[0025] Step S7: Weld the cold-bent arched upper and lower flange plates to the upper and lower edges of the trapezoidal corrugated web plate, respectively, to obtain a trapezoidal corrugated web steel arch with unequal upper and lower wave heights.

[0026] The trapezoidal corrugated web of this invention is obtained by molding a rectangular steel plate. By changing the ratio of the wave height of the upper and lower edges of the trapezoidal corrugated web, trapezoidal corrugated webs with different sag-span ratios are formed. After molding, the axis of the trapezoidal corrugated web automatically bends from a straight line to a curve, so there is no need to pre-cut the arched steel plate and no steel scrap is generated.

[0027] The superior effects of this invention are as follows:

[0028] 1) Easy to process: Based on current processing equipment and welding technology, the processing range of trapezoidal corrugated web is 3-30 mm.

[0029] mm, suitable for arched steel structures of various spans;

[0030] 2) The processing of trapezoidal corrugated web does not produce steel scraps, thus saving steel. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a flowchart illustrating the processing of a trapezoidal corrugated web steel arch according to a specific embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram of the molding process of a trapezoidal corrugated web according to a specific embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of a trapezoidal corrugation according to a specific embodiment of the present invention;

[0035] Figure 4 This is a waveform diagram of a specific embodiment of the present invention;

[0036] Figure 5 The above and below are isometric views of the trapezoidal corrugated web of a specific embodiment of the present invention;

[0037] Figure 6 The above and below flanges are isometric views of a specific embodiment of the present invention.

[0038] Figure 7 This is an elevation view of a trapezoidal corrugated web steel arch according to a specific embodiment of the present invention;

[0039] Figure 8 This is an isometric drawing of the trapezoidal corrugated web steel arch with pin-shaped arch foot, according to a specific embodiment of the present invention.

[0040] Figure 9 This is an isometric view of the fixed arch foot of the trapezoidal corrugated web steel arch belt according to a specific embodiment of the present invention;

[0041] Explanation of the labels in the diagram

[0042] 1—Trapezoidal corrugated web; 2—Upper flange;

[0043] 3—Lower flange plate; 4—Locking groove of the lower mold;

[0044] 5—Clamping fixture; 6—Upper mold;

[0045] 7—Lower mold. Detailed Implementation

[0046] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] like Figures 1-8 As shown, the present invention provides a trapezoidal corrugated web steel arch with unequal upper and lower wave heights, including a trapezoidal corrugated web 1 with a curved axis, a cold-formed upper flange plate 2 and a lower flange plate 3. The trapezoidal corrugated web 1 is mechanically and automatically welded to the upper flange plate 2 and the lower flange plate 3 to form a trapezoidal corrugated web steel arch. The trapezoidal corrugated web 1 is a rectangular plate before molding, and becomes a trapezoidal corrugated plate with unequal upper and lower wave heights after molding. Specifically, the unequal upper and lower wave heights refer to the fact that the upper edge of the web has a large wavelength and a small wave height, while the lower edge of the web has a small wavelength and a large wave height.

[0048] The thickness of the trapezoidal corrugated web 1 ranges from 3 to 30 mm, and the height-to-thickness ratio limit of the trapezoidal corrugated web 1 is relaxed to [value missing]. Where f y This represents the yield strength of the trapezoidal corrugated web steel.

[0049] like Figure 2 As shown, the present invention provides a method for processing a trapezoidal corrugated web steel arch with unequal upper and lower wave heights, comprising the following steps:

[0050] Step S1: Based on the cross-sectional dimensions, span, and rise-to-span ratio of the trapezoidal corrugated web steel arch, determine the wavelength and wave height of the upper edge and the lower edge of the trapezoidal corrugated web, and then make a molding die according to the dimensions of the trapezoidal corrugated web 1.

[0051] like Figure 3 and Figure 4 As shown, the symbols for a single trapezoidal corrugation and its waveform in the trapezoidal corrugated web are explained below:

[0052] a: The amplitude of the wave relative to the corrugation axis, i.e., half of the wave height;

[0053] b: Width of the horizontal strip in the trapezoidal corrugations;

[0054] d: The horizontal projection width of the inclined strip in the trapezoidal corrugation;

[0055] h: Wave height of the trapezoidal ripple;

[0056] r0: Radius of curvature corresponding to the arch axis;

[0057] r1: Radius of curvature corresponding to the arc of the upper flange;

[0058] r2: Radius of curvature corresponding to the lower flange arc;

[0059] s: The unfolded length of the trapezoidal corrugations;

[0060] λ: Wavelength of the trapezoidal ripple;

[0061] Subscript 0: indicates the waveform dimensions at the position of the arch axis, s0, b0, d0, a0, λ0;

[0062] Subscript 1: indicates the waveform size of the upper edge of the web, s1, b1, d1, a1, λ1;

[0063] Subscript 2: indicates the waveform dimensions of the lower edge of the web, s2, b2, d2, a2, λ2.

[0064] Before and after molding, the positions of the arch axis, the upper edge of the web, and the lower edge of the web are kept equal in terms of corrugation development length s. Therefore, the following relationship exists:

[0065] s0 = s1 = s2;

[0066] The wavelengths at the arch axis position, the upper edge of the web, and the lower edge of the web have the following relationship:

[0067] λ1>λ0>λ2;

[0068] Define coefficients k1 and k2:

[0069] k1 = r1 / r0 > 1;

[0070] k2 = r2 / r0 < 1;

[0071] According to geometric relationships, Figure 3 The waveform dimensions shown have the following relationship:

[0072]

[0073] Since the corrugated unfolding length *s* remains equal before and after molding, compared to the waveform at the arch axis position, the wavelength λ1 of the waveform at the upper edge of the web increases, and the amplitude *a1* decreases; the wavelength λ2 of the waveform at the lower edge of the web decreases, and the amplitude *a2* increases. The amplitudes *a1* and *a2* are solved with the given condition that *s* is equal, and the calculation results are as follows:

[0074]

[0075]

[0076] When designing the mold, the waveform at the position of the arch axis is used as the standard trapezoidal waveform, and its waveform dimensions are denoted as s0, b0, d0, a0, and λ0 respectively. Then, the waveform dimensions of the upper and lower edges of the trapezoidal corrugated web are determined according to the above calculation formula, and the corresponding upper mold 6 and lower mold 7 are processed.

[0077] like Figure 5 As shown, the upper edge waveform of the trapezoidal corrugated web 1 has a large wavelength and a small wave height, while the lower edge waveform has a small wavelength and a large wave height; the edge line of the trapezoidal corrugated web 1 is perpendicular to the arch axis; the thickness of the trapezoidal corrugated web 1 ranges from 3 to 30 mm, and it is suitable for arched steel structures of various spans.

[0078] Step S2: Place the flat rectangular steel plate on the lower mold 7 and fix the rectangular steel plate with the clamp 5;

[0079] Step S3: The upper mold 6 presses downwards, so that the rectangular steel plate and the lower mold 7 fit together completely, pressing the rectangular steel plate to form the first trapezoidal corrugation;

[0080] Step S4: Raise the clamp 5 and the upper mold 6, move the trapezoidal corrugations pressed in the previous step forward and place them into the positioning groove 4 of the lower mold, and place the rectangular steel plate on the lower mold 7 again.

[0081] Step S5: Fix the rectangular steel plate with clamp 5, press the upper mold 6 downward to make the rectangular steel plate fit with the lower mold 7, and press the rectangular steel plate to form the next trapezoidal corrugation.

[0082] Step S6: Repeat steps S4 and S5 to obtain a trapezoidal corrugated web 1 with unequal upper and lower wave heights. The axis of the trapezoidal corrugated web is curved, such as... Figure 5 As shown;

[0083] Step S7: The cold-bent arched upper flange plate 2 and lower flange plate 3 are welded to the upper and lower edges of the trapezoidal corrugated web plate 1, respectively, to obtain a trapezoidal corrugated web steel arch with unequal upper and lower wave heights, such as... Figure 7 As shown. By changing the ratio of the wave heights at the upper and lower edges of the trapezoidal corrugated web, trapezoidal corrugated webs with different sag-span ratios can be formed.

[0084] The trapezoidal corrugated web steel arch is connected to pin-shaped arch feet at both ends, such as... Figure 8 As shown, it is an economical, aesthetically pleasing, and structurally sound arched steel structure.

[0085] The trapezoidal corrugated web steel arch has fixed arch feet at both ends, such as... Figure 9 As shown, it is an economical, aesthetically pleasing, and structurally sound arched steel structure.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for processing a trapezoidal corrugated web steel arch with unequal upper and lower wave heights, the trapezoidal corrugated web steel arch comprising a trapezoidal corrugated web with a curved axis, a cold-formed upper flange plate and a lower flange plate, wherein the trapezoidal corrugated web plate is connected to the upper flange plate and the lower flange plate respectively by welds to form a trapezoidal corrugated web steel arch, characterized in that: The trapezoidal corrugated web has a trapezoidal waveform, with a large wavelength and small wave height at the upper edge and a small wavelength and large wave height at the lower edge; the process includes the following steps: Step S1: Based on the cross-sectional dimensions, span, and rise-to-span ratio of the trapezoidal corrugated web steel arch, determine the wavelength and wave height of the upper and lower edges of the trapezoidal corrugated web, and fabricate upper and lower molding dies according to the dimensions of the trapezoidal corrugated web. Define coefficients k1 and k2: ； ； The waveform dimensions have the following relationship: ; ； ； Where: a: wave amplitude relative to the corrugation axis, i.e., half of the wave height; b: the width of the horizontal strip in the trapezoidal corrugation; d: Horizontal projection width of the inclined strip in the trapezoidal corrugation; h: Wave height of the trapezoidal corrugation; r0: Radius of curvature corresponding to the arch axis; r1: Radius of curvature corresponding to the upper flange arc; r2: Radius of curvature corresponding to the lower flange arc; s: Length of the trapezoidal corrugation; λ: Wavelength of the trapezoidal corrugation; Subscript 0: Waveform dimension at the arch axis position; Subscript 1: Waveform dimension at the upper edge of the web; Subscript 2: Waveform dimension at the lower edge of the web; Step S2: Place the flat rectangular steel plate on the lower die and fix the rectangular steel plate with clamps; Step S3: The upper die presses downwards, so that the rectangular steel plate and the lower die fit together completely, pressing the rectangular steel plate to form the first trapezoidal corrugation; Step S4: Raise the clamp and the upper die, move the trapezoidal corrugations pressed in the previous step forward and place them into the positioning slot of the lower die, and place the rectangular steel plate on the lower die again. Step S5: Fix the rectangular steel plate with a clamp, press the upper die downward to make the rectangular steel plate fit with the lower die, and press the rectangular steel plate to form the next trapezoidal corrugation. Step S6: Repeat steps S4 and S5 to obtain a trapezoidal corrugated web with unequal upper and lower wave heights, wherein the axis of the trapezoidal corrugated web is curved. Step S7: Weld the cold-bent arched upper and lower flange plates to the upper and lower edges of the trapezoidal corrugated web plate, respectively, to obtain a trapezoidal corrugated web steel arch with unequal upper and lower wave heights.

2. The processing method for a trapezoidal corrugated web steel arch with unequal upper and lower wave heights according to claim 1, characterized in that: The edges of the trapezoidal corrugated web are perpendicular to the arch axis.

3. The processing method for a trapezoidal corrugated web steel arch with unequal upper and lower wave heights according to claim 1, characterized in that: The thickness of the trapezoidal corrugated web ranges from 3 to 30 mm.

4. The processing method for a trapezoidal corrugated web steel arch with unequal upper and lower wave heights according to claim 1, characterized in that: By changing the ratio of the wave height at the upper and lower edges of the trapezoidal corrugated web, trapezoidal corrugated webs with different sag-span ratios can be formed.

5. The processing method for a trapezoidal corrugated web steel arch with unequal upper and lower wave heights according to claim 1, characterized in that: The trapezoidal corrugated web steel arch is connected to pin arch feet or fixed arch feet at both ends.

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