A uhp connected precast prestressed concrete open-hole beam frame structure system and a design and construction method thereof

Abstract

The application discloses a UHPC connected prefabricated prestressed concrete open-hole beam frame structure system, which comprises a prefabricated concrete upper column, a prefabricated concrete lower column, a prefabricated prestressed concrete open-hole composite beam, a UHPC node core area and a composite slab. The upper longitudinal main reinforcement extends out of the bottom surface of the prefabricated upper column and is directly anchored in the UHPC node core area, the lower longitudinal main reinforcement extends out of the top surface of the prefabricated lower column and is directly anchored in the UHPC node core area, and the prestressed reinforcement and the common reinforcement extend out of the end surface of the prefabricated prestressed concrete open-hole beam and are directly anchored or bent and anchored in the UHPC node core area. The structure system not only is convenient and fast in on-site construction and improves the component installation efficiency, but also can greatly reduce the anchoring length of the reinforcement, greatly reduce the amount of the stirrup of the node core area, avoid the congestion of the reinforcement of the node core area, reduce the section height of the component, reduce the self weight, improve the component crack resistance and thus improve the seismic performance of the overall frame structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated prestressed assembly type building construction, in particular to a prefabricated prestressed concrete open-hole beam frame structure system connected by UHPC and a design and construction method thereof. BACKGROUND

[0002] The construction efficiency of cast-in-place structures is low, and the energy loss is high, and many limitations, which gradually cannot meet the development requirements of building industrialization. Prefabricated assembly type buildings have become the development direction of building industrialization due to their advantages of fast construction speed, factory production of components, reduction of on-site wet work and environmental pollution. After years of development and promotion, prefabricated assembly type concrete structures have been widely researched and used.

[0003] The prefabricated assembly type concrete frame structure refers to the structure in which the beam-column components are prefabricated in a prefabrication plant and transported to the construction site for connection to form an overall structure. Compared with cast-in-place concrete structures, it has the advantages of fast construction speed, easy guarantee of component quality, good quality, small environmental pollution, saving of labor cost, and saving of a large amount of formwork and support, and is a structure form with very broad prospects. For wet connection assembly type concrete frame structures, the node construction form which is easy to construct and effectively guarantees the integrity is the key to the popularization and application. However, from the past earthquake disasters, the assembly type structure is seriously damaged in the earthquake, and it is difficult to achieve the same seismic performance as the cast-in-place structure. In order to improve the integrity and reliability of the assembly type concrete frame node connection and achieve or exceed the seismic performance of the cast-in-place concrete structure, prestressing technology and UHPC (Ultra High Performance Concrete, ultra high performance concrete) materials are introduced into the assembly type structure.

[0004] The prestressed assembly type concrete structure is divided into pre-tensioned prestressed assembly type concrete structure and post-tensioned prestressed assembly type concrete structure. The pre-tensioned prestressed assembly type concrete structure is a structure in which the prestressed tendon is tensioned before the component is made, and then the component is poured. The post-tensioned prestressed assembly type concrete structure is a structure in which the prestressed tendon or corrugated pipe is pre-embedded before the component is made, and then the concrete is poured, and then the prestressed tendon is tensioned, and finally the components are assembled together. The internal stress generated by prestress in the concrete section can partially or completely offset the stress in the section under the use load, delay the occurrence of cracks and improve the stiffness of the component. When unloaded, the cracks can be partially or completely closed, and the elastic recovery performance of the structure is good. At the same time, the prestressed concrete can fully utilize the material strength of the prestressed tendon and the concrete, and reduce the self-weight of the structure. And the application of prestress helps to improve the performance and integrity of the assembly type structure, and promotes the application of the assembly type structure in large-span and heavy-load structures.

[0005] UHPC has excellent bonding performance, which can greatly reduce the anchorage length of steel bars and prestressed bars; it has high strength, which can reduce the amount of stirrups in the core area of the joint; using UHPC in the core area of the joint can make the structure simple and the overall integrity of the frame good. The prestressed structure has excellent stress performance, and the application of UHPC in the core area of the joint forms a prefabricated prestressed frame structure. Further research on this structure is beneficial to the further promotion and application of prefabricated prestressed concrete frame structure. SUMMARY

[0006] The purpose of the present application is to overcome the shortcomings of the prior art, combine the excellent performance of UHPC, and propose a UHPC connected prefabricated prestressed concrete open hole beam frame structure system and its design and construction method. It combines the three traditional structures of pretension or post-tensioned prestressed structure, fabricated structure and composite structure, and uses UHPC high-performance materials, so as to improve the seismic performance of prefabricated assembled concrete frame structure.

[0007] The advantages of the present application mainly lie in the connection technology of prefabricated concrete beam-column components and the steel bar connection technology between components. In terms of component connection technology, the beam-column components are connected by UHPC with excellent performance to form a UHPC joint core area, which is more conducive to achieving the seismic fortification requirements of strong joints and weak components, thereby improving the ductility of beam-column joints and the seismic performance of the overall frame structure. In terms of steel bar connection technology, the steel bars between beam-column components only need to be simply overlapped, and the overlap length is very small, thereby greatly saving the production time of prefabricated components and the installation time on site. Therefore, the UHPC connected prefabricated prestressed concrete open hole beam frame structure system and its construction method proposed by the present application meet the green development strategy of China's building industrialization.

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

[0009] A UHPC connected prefabricated prestressed concrete open hole beam frame structure system, comprising a prefabricated concrete upper column, a prefabricated concrete lower column, a prefabricated prestressed concrete open hole composite beam, a UHPC joint core area and a composite slab.

[0010] The prefabricated concrete upper column is provided with upper longitudinal main reinforcement, the prefabricated concrete lower column is provided with lower longitudinal main reinforcement, the prefabricated prestressed concrete open hole composite beam is provided with a prefabricated prestressed concrete open hole beam and a beam composite layer, the prefabricated prestressed concrete open hole beam is provided with prestressed reinforcement and ordinary reinforcement, and if necessary, hanging reinforcement and steel mesh can also be provided around the hole, and the steel mesh can also be a welded steel mesh; the beam composite layer is provided with top longitudinal reinforcement; and the composite slab is composed of a prefabricated concrete slab and a slab composite layer poured on the slab.

[0011] The upper longitudinal main reinforcement extends out of the bottom surface of the prefabricated upper column and is directly anchored in the UHPC node core area, the lower longitudinal main reinforcement extends out of the top surface of the prefabricated lower column and is directly anchored in the UHPC node core area, the prestressed reinforcement and the ordinary steel reinforcement extend out of the end surface of the prefabricated prestressed concrete open-hole beam and are directly anchored or indirectly anchored in the UHPC node core area;

[0012] The prefabricated prestressed concrete open-hole composite beam can also be a full prefabricated prestressed concrete open-hole beam; the prestressed reinforcement includes pre-tensioned straight or folded line prestressed reinforcement and post-tensioned bonded, unbonded or slow-bonded straight, folded or curved line prestressed reinforcement.

[0013] The prefabricated prestressed concrete open-hole composite beam is calculated as a prestressed concrete open-hole simply supported beam before pouring the beam composite layer, the plate composite layer and the UHPC node core area, and is calculated as a frame beam after pouring the UHPC node core area, the beam composite layer and the plate composite layer; the prefabricated prestressed concrete open-hole composite beam is different in the cross section of the upper chord at the hole and in the stress state before and after pouring, so the upper and lower chords at the hole of the prefabricated prestressed concrete open-hole beam should be calculated; for the unbonded prestressed open-hole beam, the effective prestress is used for calculation at the normal use limit state, and the stress increment of the unbonded reinforcement is considered at the ultimate bearing limit state; for the slow-bonded prestressed open-hole beam, the unbonded prestressed open-hole beam is used for calculation at the construction stage, and the bonded prestressed open-hole beam is used for calculation at the normal use limit state.

[0014] Further, the prefabricated prestressed concrete open-hole composite beam is composed of a prefabricated prestressed concrete open-hole beam and a beam composite layer; the composite plate is composed of a prefabricated concrete plate and a plate composite layer poured on the plate.

[0015] Further, the bottom surface of the prefabricated concrete upper column, the top surface of the prefabricated concrete lower column and the end surface of the prefabricated prestressed concrete open-hole composite beam are provided with recessed grooves.

[0016] Further, the prefabricated concrete upper column is fixed at the corresponding position by a reliable support.

[0017] Further, the stirrups in the prefabricated concrete upper column, the prefabricated concrete lower column and the prefabricated prestressed concrete open-hole composite beam are divided into a dense area and a non-dense area, and the stirrups in the UHPC node core area are arranged according to design requirements.

[0018] Further, the top surface of the prefabricated prestressed concrete open-hole beam and the prefabricated concrete plate is provided with a rough surface layer.

[0019] The application also provides a design method of the system, which comprises the following steps:

[0020] Step 1: beams and columns are designed according to existing specifications and invention patents;

[0021] Step 2: checking the strength of the upper and lower chords at the opening of the precast prestressed concrete open-hole beam before precasting the beam composite layer, the plate composite layer and the UHPC node core area of the precast prestressed concrete open-hole composite beam;

[0022] Step 3: The opening position in the precast prestressed concrete open-hole composite beam should be located as far as possible in the 1 / 3 section of the span. When located in the 1 / 3 section of the beam end, the distance from the edge of the hole near the node to the inner edge of the node should be greater than 1.5 times the beam height.

[0023] A UHPC connected precast prestressed concrete open-hole beam frame structure system, comprising the following steps:

[0024] Step 1: making precast concrete lower columns, precast concrete upper columns, precast prestressed concrete open-hole beams, and precast concrete slabs; wherein the precast concrete lower columns and the precast concrete upper columns have sufficient anchorage length for anchoring the longitudinal reinforcement into the node core area; the precast prestressed concrete open-hole beams have sufficient anchorage length for anchoring the ordinary steel reinforcement and the prestressed reinforcement into the node core area; wherein when making the precast prestressed concrete open-hole beam, if the prestressed reinforcement is pre-tensioned prestressed reinforcement, the pre-tensioned prestressed reinforcement is first tensioned on the pedestal before pouring the concrete, and the pre-tensioned prestressed reinforcement is released when the concrete reaches sufficient strength and sufficient anchorage length is reserved at the end of the precast beam; if the prestressed reinforcement is post-tensioned prestressed reinforcement, the post-tensioned prestressed reinforcement is first embedded in the designed position (a corrugated pipe is needed for bonding) and sufficient length is reserved at both ends, and then the concrete is poured, and the post-tensioned prestressed reinforcement is tensioned when the concrete reaches the designed tensioning strength (grouting is needed for bonding);

[0025] Step 2: after the precast components are completed, the precast concrete lower columns are hoisted and installed on the foundation, and then a proper number of stirrups are installed on the extended longitudinal reinforcement;

[0026] Step 3: the precast prestressed concrete open-hole beam is hoisted to the top surface of the precast concrete lower column, the bottom surface of the precast prestressed concrete open-hole beam is flush with the top surface of the precast concrete lower column, the end of the precast prestressed concrete open-hole beam is placed on the precast concrete lower column, and is fixed with supports, and since the beam has a prestressed effect, supports can also be omitted; wherein the steel reinforcement of the precast concrete open-hole beam on both sides is reasonably avoided and directly anchored in the node core area, and the prestressed reinforcement is reasonably avoided and anchored in a straight line or with a bend in the node core area;

[0027] Step 4: Hoist the precast concrete upper column to the top of the precast concrete lower column, fix the precast concrete upper column in the corresponding position with reliable supports, and tie the stirrups installed in Step 2; wherein, the protruding steel bars of the precast concrete upper and lower columns should be reasonably avoided in the core area of ​​the node and directly anchored.

[0028] Step 5: Pass the top continuous steel bar through the pre-reserved stirrups and the core area of ​​the node in the composite layer and tie it. Then pour the core area of ​​the UHPC node and set the formwork so that the UHPC will not enter the composite layer of the beam.

[0029] Step 6: Hoist the precast concrete slab (or composite slab, double T slab, secondary beam) onto the precast prestressed concrete beam and secure it.

[0030] Step 7: Pour the beam composite layer and slab composite layer;

[0031] Step 8: Repeat the above production process to complete the precast prestressed concrete frame structure system.

[0032] Compared with the prior art, the advantages of the present invention are as follows:

[0033] 1. This invention combines precast concrete structures and prestressed structures. It takes advantage of the advantages of precast concrete structures, such as convenient and fast construction, high quality, energy saving and environmental protection, and combines them with the advantages of prestressed structures, such as improved structural performance, reduced component cross-sectional height, reduced self-weight and improved component crack resistance, thereby improving the seismic performance of the overall frame structure.

[0034] 2. This invention uses UHPC material with excellent performance. Applying it to the core area of ​​the node can achieve reliable connection of precast beam and column components. It can not only improve the load-bearing capacity and seismic performance of the node, but also significantly reduce the anchorage length of steel bars and prestressed tendons, and significantly reduce the amount of stirrups used in the core area of ​​the node. This avoids steel bar congestion in the core area of ​​the node, and greatly improves the efficiency of precast beam and column component manufacturing, transportation and installation. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the precast prestressed concrete perforated beam frame structure system with UHPC connection according to the present invention.

[0036] Figure 2 This is a schematic diagram of the reinforcement of a two-span frame structure according to the present invention.

[0037] Figure 3 This is a schematic diagram of the material of a two-span frame structure of the present invention.

[0038] Figure 4 Detailed construction diagram of the intermediate layer frame edge node of the present invention

[0039] Figure 5 Intermediate layer framework edge node isometric view for the present invention

[0040] Figure 6 Intermediate layer framework middle node construction detail view for the present invention

[0041] Figure 7 Intermediate layer framework middle node isometric view for the present invention DETAILED DESCRIPTION

[0042] In order to make the features, objects and advantages of the present invention more easily understood, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0043] As Figures 1-7 shown, the UHPC connected prefabricated prestressed concrete open-hole frame structure system of the present invention comprises a prefabricated concrete upper column (1), a prefabricated concrete lower column (2), a prefabricated prestressed concrete open-hole composite beam (3), a UHPC node core area (4), and a composite slab (5);

[0044] The prefabricated concrete upper column (1) is provided with an upper longitudinal main reinforcement (6), the prefabricated concrete lower column (2) is provided with a lower longitudinal main reinforcement (7), the prefabricated prestressed concrete open-hole composite beam (3) is provided with a prefabricated prestressed concrete open-hole beam (8) and a beam composite layer (9), the prefabricated prestressed concrete open-hole beam (8) and the beam composite layer (9) are provided with a top-through steel bar (12), and the composite slab (5) is composed of a prefabricated concrete slab (13) and a slab composite layer (14) poured on the slab;

[0045] The upper longitudinal main reinforcement (6) extends out of the bottom surface of the prefabricated upper column (1) and is directly anchored in the UHPC node core area (4), the lower longitudinal main reinforcement (7) extends out of the top surface of the prefabricated lower column (2) and is directly anchored in the UHPC node core area (4), the prestressed reinforcement (10) and the ordinary steel bar (11) extend out of the end surface of the prefabricated prestressed concrete open-hole beam (8) and are directly anchored or bent and anchored in the UHPC node core area (4);

[0046] The prefabricated prestressed concrete open-hole composite beam (3) can also be a full prefabricated prestressed concrete open-hole beam; the prestressed reinforcement (10) includes pretensioned straight or folded line prestressed reinforcement and post-tensioned bonded, unbonded, or slow-bonded straight, folded, or curved line prestressed reinforcement;

[0047] The precast prestressed concrete open-hole composite beam (3) is calculated as a prestressed concrete open-hole simple beam before pouring the beam composite layer (9), the plate composite layer (14) and the UHPC node core area (4), and is calculated as a frame beam after pouring the UHPC node core area (4), the beam composite layer (9) and the plate composite layer (14); the precast prestressed concrete open-hole composite beam is different in the section of the upper chord at the hole and the stress state before and after pouring the beam composite layer, the plate composite layer and the UHPC node core area, so the upper chord and the lower chord at the hole of the precast prestressed concrete open-hole beam should be calculated during construction; for the unbonded prestressed open-hole beam, the effective prestress is used for calculation at the normal use limit state, and the stress increment of the unbonded tendon is considered at the ultimate bearing limit state; for the slow-bonding prestressed open-hole beam, the unbonded prestressed open-hole beam is used for calculation at the construction stage, and the bonded prestressed open-hole beam is used for calculation at the normal use limit state;

[0048] The precast prestressed concrete open-hole composite beam (3) is composed of a precast prestressed concrete open-hole beam (8) and a beam composite layer (9); the composite plate (5) is composed of a precast concrete plate (13) and a plate composite layer (14) poured on the plate;

[0049] The bottom surface of the precast concrete upper column (1), the top surface of the precast concrete lower column (2) and the end surface of the precast prestressed concrete open-hole composite beam (3) are provided with recessed grooves;

[0050] The precast concrete upper column (1) is fixed at the corresponding position by reliable supports (15);

[0051] The stirrups (16) in the precast concrete upper column (1), the precast concrete lower column (2) and the precast prestressed concrete open-hole composite beam (3) are divided into a dense area and a non-dense area, the stirrups (17) in the UHPC node core area (4) are arranged according to design requirements, the shear capacity of the core area is calculated by the softened strut-and-tie model, and the steel fibers in the UHPC are equivalent to horizontal stirrups and vertical longitudinal reinforcement, and the contribution of the steel fibers to the shear capacity of the node core area is considered;

[0052] The top surface of the precast prestressed concrete open-hole beam (8) and the precast concrete plate (13) is provided with a rough surface layer.

[0053] The seismic design of the system includes the following steps:

[0054] Step 1: The beam and the column are designed according to the existing specifications and the invention patent;

[0055] Step 2: Check the strength of the top chord at the opening of the prefabricated prestressed concrete open-hole beam before pouring the beam composite layer, the plate composite layer and the UHPC node core area of the prefabricated prestressed concrete open-hole composite beam;

[0056] Step 3: The opening position in the prefabricated prestressed concrete open-hole composite beam should be located as far as possible in the 1 / 3 section of the span, and when located in the 1 / 3 section of the beam end, the distance from the edge of the hole near the node to the inner edge of the node should be greater than 1.5 times the beam height.

[0057] A prefabricated prestressed concrete open-hole beam frame structure system connected by UHPC, characterized by comprising the following steps:

[0058] Step 1: prefabricated concrete lower column (2), prefabricated concrete upper column (1), prefabricated prestressed concrete open-hole beam (8), prefabricated concrete slab (13) are made; the prefabricated concrete lower column (2) and the prefabricated concrete upper column (1) extend the longitudinal reinforcement and anchor into the node core area (4) with sufficient anchoring length; the ordinary steel bars and prestressed reinforcement of the prefabricated prestressed concrete open-hole beam (8) extend and anchor into the node core area (4) with sufficient anchoring length; when the prefabricated prestressed concrete open-hole beam (8) is made, the prestressed reinforcement (10) is a pretensioned prestressed reinforcement, which is first tensioned on the pedestal before pouring the concrete, and then released when the concrete reaches sufficient strength and reserved with sufficient anchoring length at the end of the prefabricated beam; the prestressed reinforcement (10) is a post-tensioned prestressed reinforcement, which is first embedded in the designed position (with corrugated pipe for adhesion) and reserved with sufficient length at both ends, and then the concrete is poured, and the post-tensioned prestressed reinforcement is tensioned when the concrete reaches the designed tensioning strength (with grouting for adhesion);

[0059] Step 2: After the prefabricated components are completed, the prefabricated concrete lower column (2) is hoisted and installed on the foundation, and then a proper number of stirrups (17) are installed on the extended longitudinal reinforcement (7);

[0060] Step 3: The prefabricated prestressed concrete open-hole beam (8) is hoisted to the top surface of the prefabricated concrete lower column (2), the bottom surface of the prefabricated prestressed concrete open-hole beam (8) is flush with the top surface of the prefabricated concrete lower column (2), the end of the prefabricated prestressed concrete open-hole beam (8) is placed on the prefabricated concrete lower column (2), and is fixed with support, and since the beam has a prestressed effect, support can be omitted; the steel bars (11) extending from the two prefabricated concrete beams (8) are reasonably avoided and directly anchored in the node core area, and the prestressed reinforcement (10) extending therefrom is reasonably avoided and anchored in the node core area with a straight line or a bend;

[0061] Step 4: hoist the prefabricated concrete upper column (1) to the directly above the prefabricated concrete lower column (2), fix the prefabricated concrete upper column (1) in the corresponding position with reliable support (15), and bind the stirrup (17) installed in step 2; wherein the upper and lower column extending steel bars are reasonably avoided in the node core area and directly anchored;

[0062] Step 5: pass the top longitudinal steel bars (12) through the reserved stirrup (16) of the composite layer and the node core area (4) and bind them, then pour the UHPC node core area (4), and set the formwork so that the UHPC does not enter the beam composite layer (9) part;

[0063] Step 6: hoist the prefabricated concrete slab (or composite slab, double T slab, secondary beam) (13) to the prefabricated prestressed concrete open hole beam (8) and fix it;

[0064] Step 7: pour the beam composite layer (9) and the slab composite layer (14);

[0065] Step 8: repeat the above manufacturing process to complete the prefabricated prestressed concrete open hole beam frame structure system.

[0066] The above is only an exemplary description of the present application, and it is obvious that the specific implementation of the present application is not limited by the above method. That is, the description is not limiting, and the present application can be easily improved, changed or replaced without departing from the method concept and technical solution of the present application. These improvements and changes are within the scope of protection of the present application.

Claims

1. A prefabricated prestressed concrete open-hole beam frame structure system connected by UHPC, comprising a prefabricated concrete upper column (1), a prefabricated concrete lower column (2), a prefabricated prestressed concrete open-hole composite beam (3), a UHPC node core area (4), and a composite slab (5) ; characterized in that The prefabricated concrete upper column (1) is provided with upper longitudinal main reinforcement (6), the prefabricated concrete lower column (2) is provided with lower longitudinal main reinforcement (7), the prefabricated prestressed concrete open-hole composite beam (3) is provided with a prefabricated prestressed concrete open-hole beam (8) and a beam composite layer (9), the prefabricated prestressed concrete open-hole beam (8) is provided with prestressed reinforcement (10) and ordinary reinforcement (11), and the beam composite layer (9) is provided with a top longitudinal reinforcement (12), and the composite slab (5) is composed of a prefabricated concrete slab (13) and a slab composite layer (14) cast on the slab; The upper longitudinal main reinforcement (6) extends out of the bottom surface of the prefabricated upper column (1) and is directly anchored in the UHPC node core area (4), the lower longitudinal main reinforcement (7) extends out of the top surface of the prefabricated lower column (2) and is directly anchored in the UHPC node core area (4), and the prestressed reinforcement (10) and the ordinary reinforcement (11) extend out of the end surface of the prefabricated prestressed concrete beam and are directly anchored or bent and anchored in the UHPC node core area (4) ; The prefabricated prestressed concrete open-hole composite beam (3) can also be a fully prefabricated prestressed concrete open-hole beam; The prestressed reinforcement (10) includes pre-tensioned straight or folded line prestressed reinforcement and post-tensioned bonded, unbonded, and slow-bonded straight, folded, or curved line prestressed reinforcement; The prefabricated prestressed concrete open-hole composite beam (3) is calculated as a prestressed concrete open-hole simply supported beam before casting the beam composite layer (9), the slab composite layer (14), and the UHPC node core area (4), and is calculated as a frame beam after casting the UHPC node core area (4), the beam composite layer (9), and the slab composite layer (14) ; the prefabricated prestressed concrete open-hole composite beam is different in cross section and stress state at the hole opening before and after casting the beam composite layer, the slab composite layer, and the UHPC node core area, and the upper and lower chord bars at the hole opening of the prefabricated prestressed concrete open-hole beam should be calculated; for unbonded prestressed open-hole beams, the effective prestress is used for calculation at the normal use limit state, and the stress increment of the unbonded reinforcement is considered at the ultimate bearing limit state; for slow-bonded prestressed open-hole beams, the unbonded prestressed open-hole beam is used for calculation at the construction stage, and the bonded prestressed open-hole beam is used for calculation at the normal use limit state; The edge node, the middle node, and the corner node core area of the prefabricated prestressed concrete open-hole beam frame structure system are all UHPC node core areas (4) ; The stirrups in the UHPC node core area (4) are arranged according to design requirements, and the shear bearing capacity of the core area is calculated by considering that the steel fibers in the UHPC are equivalent to horizontal stirrups and vertical longitudinal reinforcement, and considering their contribution to the shear resistance of the node core area. The construction method of the prefabricated prestressed concrete open-hole beam frame structure system comprises the following steps: The end of the prefabricated prestressed concrete open-hole beam (8) is placed on the prefabricated concrete lower column (2), the prefabricated concrete upper column (1) is hoisted to directly above the prefabricated concrete lower column (2), and the area enclosed between the prefabricated prestressed concrete open-hole beam and the prefabricated concrete lower column and upper column is a UHPC node core area.

2. The UHPC connected precast prestressed concrete open-web beam framing system of claim 1, wherein, The prefabricated prestressed concrete open-hole composite beam (3) is composed of the prefabricated prestressed concrete open-hole beam (8) and a beam composite layer (9); and the composite slab (5) is composed of the prefabricated concrete slab (13) and a slab composite layer (14) poured on the slab.

3. The UHPC connected precast prestressed concrete open-web beam framing system of claim 1, wherein, The bottom surface of the prefabricated concrete upper column (1), the top surface of the prefabricated concrete lower column (2), and the end surface of the prefabricated prestressed concrete open-hole composite beam (3) are all provided with recessed grooves.

4. The UHPC connected precast prestressed concrete open-web beam framing system of claim 1, wherein, The stirrups in the prefabricated concrete upper column (1), the prefabricated concrete lower column (2), and the prefabricated prestressed concrete open-hole composite beam (3) are divided into a densified area and a non-densified area.

5. The UHPC connected precast prestressed concrete open-web beam framing system of claim 1, wherein, The top surface of the prefabricated prestressed concrete open-hole beam (8) and the top surface of the prefabricated concrete slab (13) are provided with a rough surface layer.

6. A design method of the UHPC connected precast prestressed concrete open-web beam frame structural system according to claim 1, characterized in that: The open-hole position in the beam should be located in the 1 / 3 section of the span as much as possible, and when located in the 1 / 3 section of the beam end, the distance from the edge of the hole near the node to the inner edge of the node should be greater than 1.5 times the beam height.

7. The construction method of the UHPC connected precast prestressed concrete open-web beam frame structural system according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: Step 1: prefabricated concrete lower column (2), prefabricated concrete upper column (1), prefabricated prestressed concrete open-hole beam (8), prefabricated concrete slab (13) are made; wherein the prefabricated concrete lower column (2) and the prefabricated concrete upper column (1) extend the longitudinal reinforcement and anchor into the node core area, and sufficient anchoring length is reserved; the ordinary steel bars and prestressed bars of the prefabricated prestressed concrete open-hole beam (8) extend and anchor into the node core area (4), and sufficient anchoring length is reserved; wherein when the prestressed bars (10) are pre-tensioned prestressed bars during the production of the prefabricated prestressed concrete open-hole beam (8), the prestressed bars (10) are pre-tensioned on the pedestal, and then the concrete is poured, and when the concrete reaches sufficient strength, the prestressed bars (10) are released, and sufficient anchoring length is reserved at the end of the prefabricated beam; when the prestressed bars (10) are post-tensioned prestressed bars, the post-tensioned prestressed bars are pre-buried in the designed position (a corrugated pipe is needed to be pre-buried if bonding is needed), and sufficient length is reserved at both ends, and then the concrete is poured, and when the concrete reaches the designed tensioning strength, the post-tensioned prestressed bars are tensioned (grouting is needed if bonding is needed); Step 2: after the prefabricated components are completed, the prefabricated concrete lower column (2) is hoisted and installed on the foundation, and then a proper number of stirrups are installed on the extended longitudinal reinforcement (7); Step 3: Hoist the prefabricated prestressed concrete open-hole beam (8) to the top surface of the prefabricated concrete lower column (2), make the bottom surface of the prefabricated prestressed concrete open-hole beam (8) flush with the top surface of the prefabricated concrete lower column (2), make the end of the prefabricated prestressed concrete open-hole beam (8) rest on the prefabricated concrete lower column (2), and fix it with simple support. Since there is prestress in the beam, it can also be supported. The steel bars (11) extending from the two sides of the prefabricated prestressed concrete beam (8) are reasonably avoided and directly anchored in the node core area, and the prestressed steel bars (10) extending from the node core area are reasonably avoided and anchored in a straight line or bent; Step 4: Hoist the prefabricated concrete upper column (1) directly above the prefabricated concrete lower column (2), fix the prefabricated concrete upper column (1) in the corresponding position with reliable support (15), and bind the stirrups installed in step 2; wherein the extending steel bars of the prefabricated concrete upper and lower columns are reasonably avoided and directly anchored in the node core area; Step 5: Pass the top longitudinal steel bars (12) through the stirrups reserved in the composite layer and the node core area (4) and bind them well, and then pour the UHPC node core area (4), and set the formwork so that the UHPC does not enter the beam composite layer (9) part; Step 6: Hoist the prefabricated concrete slab, composite slab, double-T slab or secondary beam to the prefabricated prestressed concrete open-hole beam (8) and fix it; Step 7: Pour the beam composite layer (9) and the plate composite layer (14); Step 8: Repeat the above manufacturing process to complete the prefabricated prestressed concrete open-hole beam frame structure system.

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