Large-span prestressed concrete holed beam frame structure system reinforced by profile steel and stiffening plates

Abstract

The utility model discloses a large-span prestressed concrete perforated beam frame structure system reinforced by section steel and stiffening plates. The large-span prestressed concrete perforated beam frame structure system comprises a prestressed concrete beam, prestressed tendons, common full-length reinforcing steel bars, the section steel used for reinforcing a hole, hole upper and lower chord stirrups, hole upper and lower chord angle ribs, stirrups on the side edge of the hole and reinforcing inclined ribs on the side edge of the hole. Wherein the profile steel and the upper and lower chord angle ribs of the hole are mainly used for supplementing the loss of strength and rigidity of concrete caused by hole opening, and the stirrups and the inclined ribs on the side edges of the hole are used for bearing shear force transmission of a concrete beam. By adopting the reinforcing measures to reinforce the hole, the site construction is convenient and quick, the component mounting efficiency is improved, the use amount of reinforcing steel bars can be greatly reduced, the congestion of the reinforcing steel bars in a core area is avoided, the section height of the component can be reduced, the self weight is reduced, and the anti-cracking performance and the bearing capacity of the component are improved, so that the anti-seismic performance of the whole frame structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of construction of long-span prestressed concrete open-hole beam frame structure systems, and particularly to a long-span prestressed concrete open-hole beam frame structure system reinforced by steel sections and stiffening plates. Background Technique

[0002] In recent years, side-line railway stations have been widely used in the design schemes of medium and small high-speed railway stations due to their economy and architectural characteristics. Due to investment control and building function reasons in railway passenger station buildings, traditional single-span long-span reinforced concrete frame structure systems are generally adopted for two-story side-type passenger station buildings, and the net height of the first-floor ceiling is controlled at about 5.4 m, and the net height of the waiting hall is relatively depressing, affecting the comfort of passengers. To meet the requirements of passenger comfort, clear height and cost reduction, a long-span prestressed concrete open-hole beam frame structure scheme is proposed, which is convenient for equipment pipelines to pass through and improves the building clear height. If the equipment pipelines pass through the holes in the beams, the number of building floors can be increased and the floor area ratio can be increased under the condition of constant total height, carbon emissions can be reduced, and good social and economic benefits can be obtained. In addition, when the number of floors of the building is fixed, reducing the floor height through this measure can correspondingly reduce the total height of the building, relatively increase the usable space, reduce the self-weight, and reduce the load effects (including seismic load effects, wind load effects, etc.), thereby reducing the project cost.

[0003] However, opening holes in the beams destroys the integrity and continuity of the beams, and stress concentration is likely to occur at the corners of the holes, causing the beams to crack prematurely. When the crack width is too large, it will affect the durability of the beams. The existence of holes in the beam webs weakens the strength and stiffness of the beams and changes the force mechanism of the beams under static loads and seismic actions. At the same time, the shear bearing capacity of the open-hole beams decreases significantly, and the deflection increases significantly, especially for long-span prestressed concrete frame structures, the effect is more significant.

[0004] Steel reinforced concrete structure is a composite structure form with steel sections embedded in ordinary reinforced concrete structures. Compared with ordinary reinforced concrete structures, when the cross-sectional area of the members is the same, the upper limit value of the total amount of reinforcement (including ordinary steel bars and steel sections) of the steel reinforced concrete structure is larger, which means higher bearing capacity and stiffness. Compared with steel structures, the steel reinforced concrete structure has higher stiffness, good durability and fire resistance, and can save a large amount of costs in terms of steel consumption and anti-corrosion and fire protection of steel structures. At present, steel reinforced concrete column members have been widely used in general multi-story and high-rise building structures, while SRC beam members are mainly used in long-span and heavy-load structures, such as industrial factories, large stadiums, exhibition halls, bridges and transfer structures of high-rise buildings, etc.

[0005] Applying steel reinforced concrete to the upper and lower chords of the opening can, on the one hand, compensate for the weakening of strength and stiffness caused by the opening, and on the other hand, save the amount of steel bars, avoid congestion of steel bars, and improve the construction quality. Therefore, it becomes possible to apply steel reinforced concrete to the opening. By strengthening the opening of the long-span prestressed concrete open-hole beam frame structure with steel shapes, it provides a design method for further popularizing the application of the long-span prestressed concrete open-hole beam frame structure in areas with different seismic grades, so as to reduce the load effects (including seismic load effects, wind load effects, etc.), thereby reducing the project cost and obtaining significant economic and social benefits. Summary of the Invention

[0006] The purpose of the present invention is to propose a long-span prestressed concrete open-hole beam frame structure system strengthened with steel shapes and stiffening plates in view of the deficiencies existing in the prior art and combining the excellent performance of steel reinforced concrete. It combines three traditional structures: steel reinforced concrete, prestressed concrete structure, and the opening inclined bar reinforcement structure system, so as to achieve the purpose of improving the seismic performance of the long-span prestressed concrete open-hole beam frame structure system.

[0007] The advantages of the present invention are mainly reflected in three aspects: steel reinforced concrete, prestressed concrete, and opening inclined bar reinforcement. In terms of member force transmission, the upper and lower chords of the opening form an integral body with the adjacent concrete beams through steel reinforced concrete, thereby improving the seismic performance of the overall frame structure. In terms of the amount of steel bars, the steel bars in the upper and lower chords of the opening are greatly reduced, thus greatly saving the production time and on-site installation time of precast components and improving the construction quality. Therefore, the long-span prestressed concrete open-hole beam frame structure system strengthened with steel shapes proposed by the present invention conforms to the green development strategy of China's building industrialization.

[0008] The technical problems solved by the present invention can be realized by the following technical solutions:

[0009] A long-span prestressed concrete open-hole beam frame structure system strengthened with steel shapes and stiffening plates, including prestressed concrete beams, prestressing tendons, ordinary full-length steel bars, steel shapes for opening reinforcement, stirrups for the upper and lower chords of the opening, corner bars for the upper and lower chords of the opening, additional stirrups on the side of the opening, and additional inclined bars on the side of the opening.

[0010] The prestressing tendons, ordinary full-length steel bars, steel shapes for strengthening the upper and lower chords of the opening, stirrups for the upper and lower chords of the opening, corner bars for the upper and lower chords of the opening, additional stirrups on the side of the opening, and additional inclined bars on the side of the opening are provided in the concrete beam.

[0011] The steel shapes are located at the geometric centroid of the upper and lower chords of the opening and are anchored at both ends in the adjacent intact concrete beams.

[0012] The steel shapes are fixed by stirrups for the upper and lower chords of the opening, corner bars for the upper and lower chords of the opening, and additional inclined bars on the side of the opening.

[0013] The upper and lower chord corner bars of the opening extend out of the opening area and are directly anchored to the adjacent intact concrete beam.

[0014] The reinforcing diagonal bars on the side of the opening are bent in the area on the side of the opening through the upper and lower chords of the opening.

[0015] The prestressed concrete beam also includes a fully precast prestressed concrete beam; the bonded prestressing tendons include straight, broken line, and curved prestressing tendons.

[0016] The bonded prestressing tendons in the opening area can be bonded, partially bonded or unbonded.

[0017] The prestressing tendons adopt the post-tensioning construction method.

[0018] Before the steel reinforced concrete, prestressed concrete and diagonal bars of the opening are reinforced, construction checks are carried out according to the force transfer mode suitable for ordinary concrete beams. After pouring the concrete beam and the upper and lower chords of the opening, when the concrete strength of the concrete beam and the upper and lower chords of the opening reaches the design requirements, the bonded prestressing tendons are tensioned. After the tensioning is completed, construction stage checks are carried out according to the unbonded frame beam; at the normal service limit state, calculations are carried out according to the effective prestress. At the ultimate bearing limit state, the stress increment of the unbonded tendons is considered. Under seismic loads, the recovery performance provided by the unbonded tendons is considered.

[0019] Furthermore, the long-span prestressed concrete open-hole beam frame structure system strengthened by steel shapes consists of three traditional structures: steel reinforced concrete structure, prestressed concrete structure and the structure system strengthened by diagonal bars of the opening.

[0020] Furthermore, the steel bars of the ordinary reinforced concrete beam (except for the opening area) are tied according to the construction drawings. The stirrups are divided into a dense area and a non-dense area, and the reinforcement is arranged according to the design requirements.

[0021] Furthermore, the reinforcing stirrups on the side of the opening, the corner bars of the upper and lower chords of the opening and the stirrups of the upper and lower chords of the opening are tied in their corresponding positions. The reinforcement design is carried out according to the corresponding specifications.

[0022] Furthermore, the steel shapes are placed in the upper and lower chords of the opening and are fixed by the stirrups of the upper and lower chords of the opening, the corner bars of the upper and lower chords of the opening and the reinforcing diagonal bars on the side of the opening.

[0023] Furthermore, the prestressing tendons are arranged in the concrete beam member, pass through the lower chord of the opening and extend out of the concrete beam at both ends, and fixtures and anchors are respectively fixedly arranged at both ends.

[0024] Furthermore, pour the concrete, paying particular attention to the vibration in the opening area.

[0025] A large-span prestressed concrete open-hole beam frame structure system reinforced with profiled steel and stiffening plates, comprising the following steps:

[0026] Step 1: Bind the steel reinforcement cages of the concrete columns and concrete beams (except for the hole area); among them, the upper and lower chord stirrups, the stirrups on the side of the hole, and the strengthening inclined bars on the side of the hole in the hole area should be placed in the hole area in advance.

[0027] Step 2: Bind the stirrups on the side of the hole.

[0028] Step 3: Place the profiled steel at the geometric center of the upper and lower chords of the hole and temporarily fix it.

[0029] Step 4: Pass the strengthening inclined bars on the side of the hole and the corner bars of the upper and lower chords of the hole through the stirrups of the upper and lower chords of the hole.

[0030] Step 5: Bind the strengthening inclined bars on the side of the hole, the corner bars of the upper and lower chords of the hole, and the upper and lower chord stirrups in their respective positions.

[0031] Step 6: Adjust the positions of each steel bar, and fix the position of the profiled steel through the upper and lower chords in the hole, the upper and lower chord stirrups of the hole, the corner bars of the upper and lower chords of the hole, and the strengthening inclined bars on the side of the hole.

[0032] Step 7: Pass the prestressed steel strands through the lower chord of the hole through the hole area, and leave the anchor plates and spiral stirrups at both ends.

[0033] Step 8: Pour the beams and columns of the frame structure, and pay attention to ensuring that the hole area is vibrated densely.

[0034] Step 9: When the concrete reaches the corresponding strength, tension the prestressed tendons.

[0035] Step 10: Repeat the above manufacturing process to complete the large-span prestressed concrete open-hole beam frame structure system reinforced with profiled steel.

[0036] Compared with the prior art, the advantages of the present utility model are as follows:

[0037] 1. The utility model combines the post-tensioned bonded prestressed concrete open-hole beam frame structure and the steel-concrete structure. On the basis of the advantages of the steel-concrete structure, such as convenient and rapid construction, good construction quality, energy conservation and environmental protection, it combines the advantages of the post-tensioned bonded prestressed structure, which can improve the service performance of the structure, reduce the cross-sectional height of the components, reduce the self-weight, improve the crack resistance of the components and self-recovery, thereby improving the seismic performance of the overall frame structure.

[0038] 2. The utility model adopts steel reinforced concrete and applies it to the opening area, which can realize the reliable connection between the upper and lower chords of the opening and the complete concrete beam. It can not only improve the bearing capacity and seismic performance of the opening area, but also greatly reduce the amount of steel bars and significantly reduce the amount of stirrups in the opening area, thus avoiding the congestion of steel bars in the opening area and greatly improving the manufacturing, transportation, installation efficiency and construction quality of precast beam and column components. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 FIG. is a structural schematic diagram of a large-span prestressed concrete open-hole beam frame structure system with steel reinforcement of the present utility model

[0040] Figure 2 FIG. is a front view of the reinforcement of the opening of a large-span prestressed concrete open-hole beam frame structure system with steel reinforcement of the present utility model

[0041] Figure 3 FIG. is a side sectional view of the reinforcement of the opening of a large-span prestressed concrete open-hole beam frame structure system with steel reinforcement of the present utility model

[0042] The corresponding relationship between the reference numerals and the components is as follows: prestressed concrete beam (1), ordinary full-length steel bars (2), upper and lower chord corner bars of the opening (3), prestressing tendons (4), strengthening stirrups on the side of the opening (5), upper and lower chord stirrups of the opening (6), strengthening inclined bars on the side of the opening (7), and steel shapes (8) for opening reinforcement. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] In order to make the features, purposes and advantages of the present utility model better understood, the present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0044] As Figures 1-3 shown, a large-span prestressed concrete open-hole beam frame structure system with steel reinforcement of the present utility model includes a prestressed concrete beam (1), prestressing tendons (4), ordinary full-length steel bars (2), steel shapes (8) for opening reinforcement, upper and lower chord stirrups of the opening (6), upper and lower chord corner bars of the opening (3), strengthening stirrups on the side of the opening (5), and strengthening inclined bars on the side of the opening (7).

[0045] The prestressing tendons (4), ordinary full-length steel bars (2), steel shapes (8), upper and lower chord stirrups of the opening (6), upper and lower chord corner bars of the opening (3), strengthening stirrups on the side of the opening (5), and strengthening inclined bars on the side of the opening (7) are arranged in the concrete beam. The steel shapes (8) for opening reinforcement are fixed by the upper and lower chord stirrups of the opening (6), the upper and lower chord corner bars of the opening (3), and the strengthening inclined bars on the side of the opening (7).

[0046] The prestressed concrete beam (1) also includes a fully precast prestressed concrete beam, and the prestressing tendon (4) includes straight, broken-line, and curved prestressing tendons.

[0047] The prestressing tendon (4) can be bonded, partially bonded, or unbonded within the prestressed concrete beam (1); when the concrete strength reaches the design requirements, the prestressing tendon (4) is tensioned, and after the tensioning is completed, the supports are removed.

[0048] The linearity of the prestressing tendon should satisfy the prestressed concrete beam (1) and avoid the opening area. Specifically, the distance between this side of the prestressing tendon and the opening should be more than 1 times the beam height. The section steel (8) is located at the geometric centroid of the upper and lower chords of the opening, and the selection of the section steel is designed according to requirements. The section steel presents an I-shaped, and the design of the section steel needs to meet the corresponding design specifications.

[0049] The stirrups (6) of the upper and lower chords of the opening present a square shape, and the stirrups (6) of the upper and lower chords of the opening are arranged according to the design requirements, and the corner bars (3) of the upper and lower chords of the opening are arranged according to the design requirements.

[0050] In the opening area, the section is larger than that of ordinary stirrups. Secondly, the shape of the stirrups should facilitate the passage of the section steel. The spacing of the stirrups (5) on the side of the opening is arranged according to the design requirements.

[0051] The reinforcing diagonal bars (7) on the side of the opening present a shape like the Chinese character 'ji', and the position of the reinforcing diagonal bars (7) on the side of the opening needs to pass through the area on the side of the opening.

[0052] The opening of the prestressed concrete beam (1) is located at the geometric center of the concrete section.

[0053] The said section steel (8) is placed inside the stirrups (6) of the upper and lower chords of the opening. The section steel (8) is fixed by the corner bars (3) of the upper and lower chords of the opening and the reinforcing diagonal bars (7) on the side of the opening.

[0054] The corner bars (3) of the upper and lower chords of the opening extend out of the opening area and are directly anchored to the adjacent intact concrete beam. The design and anchorage length of the corner bars (3) of the upper and lower chords of the opening are designed according to requirements.

[0055] The reinforcing diagonal bars (7) on the side of the opening are placed inside the upper and lower chords of the opening and need to be bent in the area on the side of the opening. The reinforcing diagonal bars (7) on the side of the opening present a shape like the Chinese character 'ji'. The design of the reinforcing diagonal bars (7) on the side of the opening is designed according to requirements.

[0056] The prestressed concrete beam (1) also includes a fully precast prestressed concrete beam and a cast-in-place concrete beam.

[0057] The bonded prestressing tendon (4) includes straight, broken-line, and curved prestressing tendons.

[0058] The bonded prestressed tendons (4) can be bonded, bonded or partially bonded, or unbonded or unbonded within the opening area.

[0059] The prestressed tendons (4) are constructed using a post-tensioning method.

[0060] Before the reinforcement of the steel-concrete, prestressed concrete and the diagonal reinforcement of the opening, construction verification calculation is carried out according to the force transmission mode suitable for ordinary concrete beams. After the concrete beams and the upper and lower chords of the opening are cast, the concrete strength of the concrete beams and the upper and lower chords of the opening reaches the design requirements, and the bonded prestressed reinforcement (4) is tensioned. After the tensioning is completed, the construction stage verification calculation is carried out according to the unbonded frame beam; in the normal use limit state, the calculation is carried out according to the effective prestress, in the ultimate bearing limit state, the stress increment of the unbonded reinforcement is considered, and under the earthquake load, the recovery performance provided by the unbonded reinforcement is considered.

[0061] The steel bars of the ordinary reinforced concrete beam (except the opening area) are tied according to the construction drawings. The stirrups are divided into reinforced areas and non-reinforced areas. The reinforcement is arranged according to the design requirements.

[0062] The reinforcing stirrups (5) on the sides of the opening, the angle bars (3) on the upper and lower chords of the opening and the stirrups (6) on the upper and lower chords of the opening are tied at corresponding positions. The reinforcement design is designed and verified according to the corresponding specifications.

[0063] The section steel (8) is placed in the upper and lower chords of the opening and is fixed by the upper and lower chord stirrups (6), the upper and lower chord angle bars (3) and the strengthening diagonal bars (7) on the sides of the opening.

[0064] The prestressed tendons (4) are arranged in the concrete beam component, pass through the lower chord of the opening, and extend out of the concrete beam at both ends, with clamps and anchors respectively fixed at both ends.

[0065] Next, pour the concrete, paying special attention to the vibration of the opening area.

[0066] A long-span prestressed concrete beam frame structure system reinforced with section steel, characterized by comprising the following steps:

[0067] Step 1: The reinforcement of the columns and beams (excluding the opening area) of the prestressed concrete frame is designed and tied in accordance with the normal prestressed concrete frame. To facilitate subsequent construction, the upper and lower chord stirrups (6) of the opening area, the stirrups (5) on the sides of the opening, and the strengthening diagonal bars (7) on the sides of the opening should be placed in the opening area in advance.

[0068] Step 2: Tie the stirrups (5) on the side of the opening at a reasonable position according to the construction drawings. When designing the stirrups (5) on the side of the opening, it is necessary to take the steel section (8) into consideration to avoid conflicts between the stirrups (5) and the steel section (8).

[0069] Step 3: For the convenience of subsequent construction, the profiled steel (8) needs to be temporarily placed into the upper and lower chords of the opening, passed through the stirrups (6) of the upper and lower chords of the opening, and temporarily fixed by the stirrups (6) of the upper and lower chords of the opening, the corner bars (3) of the upper and lower chords of the opening, and the reinforcing diagonal bars (7) on the side of the opening.

[0070] Step 4: The reinforcing diagonal bars (7) on the side of the opening need to be first passed through the stirrups (6) of the upper and lower chords of the opening and temporarily fixed. At the same time, the corner bars (3) of the upper and lower chords of the opening are passed through the stirrups (6) of the upper and lower chords of the opening and temporarily fixed.

[0071] Step 5: According to the construction drawings, the reinforcing diagonal bars (7) on the side of the opening, the corner bars (3) of the upper and lower chords of the opening, and the stirrups (6) of the upper and lower chords are tied at the corresponding reasonable positions. First, the stirrups (6) of the upper and lower chords should be tied and fixed. Secondly, the reinforcing diagonal bars (7) on the side of the opening are fixed on the reinforcing diagonal bars (7) on the side of the opening and the stirrups (6) of the upper and lower chords. Finally, the corner bars (3) of the upper and lower chords of the opening should be placed at the corners of the stirrups (6) of the upper and lower chords (excluding the corner positions of the full-length bars).

[0072] Step 6: According to the construction drawings, the stirrups (6) of the upper and lower chords of the opening, the corner bars (3) of the upper and lower chords of the opening, and the reinforcing diagonal bars (7) on the side of the opening are checked. The profiled steel (8) should be placed at the geometric center of the upper and lower chords of the two openings, and the position of the profiled steel (8) is fixed by the middle of the upper and lower chords of the opening, the stirrups (6) of the upper and lower chords of the opening, the corner bars (3) of the upper and lower chords of the opening, and the reinforcing diagonal bars (7) on the side of the opening.

[0073] Step 7: The prestressed tendon (4) is passed through the lower chord of the opening, and the linear type of the prestressed tendon (4) is fixed according to the construction drawings. Anchor plates and spiral stirrups are left at both ends of the prestressed concrete for the tensioning of the prestressed tendon (4).

[0074] Step 8: When pouring the prestressed concrete frame, the frame columns should be poured first. Secondly, the concrete within the height range of the lower chord beam in the opening and the area near the opening is poured, and the concrete vibrator is used for oblique vibration. Finally, the concrete in the opening area and the concrete in other parts of the prestressed concrete beam are poured. Pay attention to ensuring that the vibration in the opening area is dense.

[0075] Step 9: Before applying prestress to the prestressed tendon (4), the appearance and dimensions of the component should be checked. Tensioning can only be carried out when the appearance and dimensions of the component meet the quality standard requirements. When tensioning, the concrete strength of the component should meet the design requirements. When not specified in the design, the concrete strength should not be lower than 75% of the design strength grade value.

[0076] Step 10: Repeat the above manufacturing process to complete the large-span prestressed concrete open-hole beam frame structure system with profiled steel reinforcement.

[0077] As described above, it is only an exemplary description of the present utility model. Obviously, the specific implementation of the present utility model is not limited by the above-mentioned manner, that is, the description is not restrictive. Without departing from the method concept and technical solution of the present utility model, the present utility model can be easily improved, changed or replaced, and these improvements and changes all fall within the protection scope of the present utility model.

Claims

1. A long-span prestressed concrete open-hole beam frame structure system reinforced with profiled steel and stiffening plates, characterized in that, It includes a prestressed concrete beam (1), prestressed tendons (4), ordinary longitudinal reinforcement bars (2), steel shapes (8) for opening reinforcement, upper and lower chord stirrups (6) of the opening, upper and lower chord corner bars (3) of the opening, stirrups (5) for strengthening the side of the opening, and diagonal bars (7) for strengthening the side of the opening. The steel shapes (8) for opening reinforcement, upper and lower chord stirrups (6) of the opening, upper and lower chord corner bars (3) of the opening, prestressed tendons (4), and ordinary longitudinal reinforcement bars (2) are arranged in the upper and lower chords of the opening of the prestressed concrete beam (1). The stirrups (5) for strengthening and the diagonal bars (7) for strengthening are arranged on the side of the opening of the prestressed concrete beam (1). The steel shapes (8) for opening reinforcement are fixed by the upper and lower chord stirrups (6) of the opening, upper and lower chord corner bars (3) of the opening, and diagonal bars (7) for strengthening the side of the opening. The prestressed concrete beam (1) further includes a fully precast prestressed concrete beam. The prestressed tendons (4) include straight, broken-line, and curved prestressed tendons. The construction method of post-tensioning is adopted for the prestressed tendons. The prestressed tendons (4) can be bonded, partially bonded, or unbonded within the prestressed concrete beam (1). After the concrete strength reaches the design requirements, the prestressed tendons (4) are tensioned. After the tensioning is completed, the supports are removed.

2. A large-span prestressed concrete open-hole beam frame structure system reinforced with profiled steel and stiffening plates according to claim 1, characterized in that, The linearity of the prestressed tendons should meet the requirements of the prestressed concrete beam (1) and avoid the opening area. The distance between the prestressed tendons and the opening should be more than one beam height.

3. A large-span prestressed concrete open-hole beam frame structure system reinforced with profiled steel and stiffening plates according to claim 1, characterized in that, The steel shape presents an I-shape, and the design of the steel shape needs to meet the corresponding design specifications. The steel shapes (8) are fixed by the upper and lower chord stirrups (6) of the opening, upper and lower chord corner bars (3) of the opening, and diagonal bars (7) for strengthening the side of the opening.

4. A large-span prestressed concrete open-hole beam frame structure system reinforced with steel shapes and stiffening plates according to claim 1, characterized in that The upper and lower chord stirrups (6) of the opening present an O-shape. The upper and lower chord stirrups (6) of the opening are arranged according to the design requirements. The upper and lower chord corner bars (3) of the opening are arranged according to the design requirements.

5. A large-span prestressed concrete open-hole beam frame structure system reinforced with profiled steel and stiffening plates according to claim 1, characterized in that, In the opening area, it is larger than the cross-section of ordinary stirrups. Secondly, the shape of the stirrups should facilitate the passage of the steel shape. The spacing of the stirrups (5) on the side of the opening is arranged according to the design requirements.

6. A large-span prestressed concrete open-hole beam frame structure system reinforced with profiled steel and stiffening plates according to claim 1, characterized in that, The diagonal bars (7) for strengthening present an L-shape. The position of the diagonal bars (7) for strengthening needs to pass through the area on the side of the opening.

7. A large-span prestressed concrete open-hole beam frame structure system reinforced with profiled steel and stiffening plates according to claim 1, characterized in that, The opening of the prestressed concrete beam (1) is located at the geometric center of the concrete cross-section.

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