CN105525679B - A kind of local prestressing force assembled energy-dissipation beam column node - Google Patents

Abstract

The invention discloses a kind of local prestressing force assembled energy-dissipation beam column node, including precast concrete column, precast concrete beam, replaceable power consumption rod, presstressed reinforcing steel, anchorage；The precast concrete column reserves presstressed reinforcing steel duct and bracket in node district；The precast concrete beam is that presstressed reinforcing steel duct is provided with the middle of pretensioned prestressed concrete girder, beam-ends section, and beam-ends bottom is provided with tongue and groove；The precast concrete beam is shelved on the bracket, is crimped and fixed by local post-tensioned prestressing muscle, upper surface cast-in-place concrete in FFL；The replaceable power consumption rod is installed on the precast concrete beam upper and lower surface, and quantity, specification and effect opportunity are designed according to different anti-seismic grade, during positioned at lower surface, and through the preformed hole of the bracket, exposed portion is coated by mortar.The present invention improves restorability of the precast concrete framework under earthquake, enhances energy dissipation capacity, realizes classification damping power consumption, is easy to repair after shake.

Description

A locally prestressed assembled energy-dissipating beam-column joint

technical field

The invention relates to a prestressed assembled energy-dissipating beam-column joint, which belongs to the field of construction engineering.

Background technique

The prefabricated concrete frame structure can greatly improve the construction capacity and construction speed, save a lot of labor, ensure the construction quality, and help meet the requirements of "four festivals and one environmental protection", and intensify the promotion of "building industrialization and housing industrialization" in the country. It has a good development prospect under the background of promoting green building and green construction. In terms of structural performance, the beam-column connection nodes of precast concrete frame structures are related to the seismic performance of the entire structure. Previous structural earthquake damage has shown that the damage of beam-column connection nodes is often the main cause of structural failure. Therefore, the precast concrete beam-column connection nodes are The key to the widespread application of precast concrete frame structures.

Prestressed concrete can make better use of the advantages of precast concrete factory production and prefabricated installation, and prestressed preloaded connections can provide good recovery performance and facilitate post-earthquake repairs, which have received extensive attention. However, at present, conventional prestressed precast beam-to-column connections mostly adopt the form of prestressed tendons arranged along the entire length of the precast beam. The prestressed tensile force is high, and the workload of prestressed tendon perforation is large, and post-tensioned prestressing significantly affects the overall quality of the precast beam. Stress performance.

The prestressed prefabricated concrete structure has high deformation recovery capacity due to the presence of prestressed tendons, but its energy dissipation capacity is weak, and it is necessary to increase the energy dissipation capacity through corresponding measures. The energy dissipation capacity of general energy-dissipating components can only be designed for a single definite seismic level, and often does not work under earthquakes smaller than this level.

Contents of the invention

The purpose of the present invention is to propose a locally prestressed assembled energy-dissipating beam-column joint, which improves the advantages of prefabricated prestressed concrete frame structures, maintains the strong recovery performance of pre-compressed prefabricated beam-column joints, and at the same time reduces post-tensioned prestressed tendons The impact on the overall structure can enhance the energy dissipation capacity of the structure, realize hierarchical shock absorption, and facilitate post-earthquake repairs.

The technical solution adopted in the present invention is: a locally prestressed assembled energy-dissipating beam-column node, including prefabricated concrete columns, prefabricated concrete beams, prestressed tendons, prestressed anchors and detachable energy-dissipating rods;

The prefabricated concrete column reserves prestressed tendon channels and corbels in the beam-column connection area, and the corbels reserve channels at the installation positions of the detachable energy dissipation rods for passing through the detachable energy dissipation rods. Great;

The prefabricated concrete beam is a pretensioned prestressed beam, and the upper and lower parts of the cross-section are provided with pretensioned prestressed tendons according to the calculation requirements, which are made by the long-line method pedestal to give full play to the advantages of the long-line method prestressed member production; the end of the prefabricated concrete beam is reserved The prestressed channel is located in the middle of the height of the beam section, and is symmetrically arranged left and right; its length is reasonably calculated according to the deformation requirements of the prestressed tendon; the tail of the prestressed tendon channel is bent toward the side of the beam, leaving space for tensioning and anchoring of the prestressed tendon; The lower part of the end section of the prefabricated concrete beam has corbels;

The end of the precast concrete beam rests on the corbel of the precast concrete column; the prestressed tendon passes through the prestressed tendon tunnel at the end of the precast concrete column and the precast concrete beam, and passes through the post-tensioned prestressing The two are crimped into one; the two ends of the prestressed tendon are anchored by the anchor; the upper surface of the prefabricated concrete beam is superimposed with cast-in-place concrete within the height range of the floor;

The detachable energy-dissipating rod is used to enhance the energy-dissipating capacity of the node of the present invention, and is installed on the upper and lower surfaces of the precast concrete beam, one end is connected to the precast concrete column, and the other end is connected to the precast concrete beam.

As a preference, a pressure-bearing end plate is provided at the position of the corbel tongue and groove, and the stirrups at the corbel tongue and nearby positions are encrypted to effectively restrain the concrete at the beam end and ensure that the beam end is less damaged or even not damaged under the action of the earthquake .

Preferably, when the detachable energy dissipation rod is located on the upper surface of the prefabricated concrete beam, it is poured into the cast-in-situ concrete; cover. The detachable energy-dissipating rods can be installed on the upper and lower surfaces of the precast concrete in groups of multiple detachable energy-dissipating rods of different specifications, and play the role of yield energy dissipation in stages according to different seismic levels .

Preferably, the detachable and replaceable energy-dissipating rod includes a mild steel rod, an anti-buckling sleeve, an anchor sleeve, a nut and a fixing iron; the anti-yield sleeve is set on the soft steel rod; the anchor sleeve The cylinder is pre-embedded in the prefabricated concrete column, and one end is provided with an internal thread whose size matches the thread of the mild steel rod, and the other end is provided with mutually perpendicular holes passing through two transverse steel rods to enhance the anchoring capacity The fixed iron parts are pre-embedded on the upper and lower surfaces of the prefabricated prestressed concrete beam end; one end of the soft steel rod is provided with a short thread section, and the other end is provided with a long thread section, and the thread is formed by rolling, so that the strength of the thread section is higher than normal section; the short threaded end is screwed into the anchor sleeve, and the long threaded end is connected to the fixed iron piece through two nuts.

Preferably, the fixed iron piece includes an angle iron, a shear key and a stiffening rib, and a U-shaped notch is left on one side of the angle iron, and the width of the notch is larger than the diameter of the soft steel rod and smaller than the size of the nut; the shear The force key is welded to the bottom surface of the other side of the angle iron; the shear force key is buried in the prefabricated concrete; the stiffener is welded to both ends of the angle iron inner side.

Preferably, the anti-yielding sleeve is made of ordinary round steel pipe, the inner diameter is 1-5mm larger than the diameter of the soft steel rod, the soft steel rod is made of low-yield steel, and the number of nuts is 2-4 , the two nuts close to the fixed iron piece can clamp the U-shaped notch of the fixed iron piece, and a gap can also be reserved, and the size of the gap is designed according to the action timing of different seismic levels.

Beneficial effect:

(1) The present invention adopts the pre-tensioning method to precast concrete beams, and the precast concrete beams and precast columns are crimped together through post-tensioning prestressing, forming an effective dry connection into a whole, reducing wet operations, improving the efficiency of on-site installation, and improving build speed.

(2) The beam end of the present invention has been strengthened, and under the earthquake action, the damage is slight, and post-tensioned prestressed tendons are arranged at the center of the prefabricated beam end to connect the precast column, and after the earthquake action, it has better recovery performance , to facilitate rapid repair after the earthquake and resume use.

(3) The post-tensioned prestressed tendon of the present invention is only arranged at the end of the prefabricated beam, and the length can be designed according to the structural deformation requirements, which has high flexibility, reduces the influence of the post-tensioned prestressed force on the overall structure, and reduces the number of prestressed tendons. The dosage and the perforation workload of post-tensioned prestressed tendons reduce the cost.

(4) The present invention installs anti-buckling energy-dissipating rods in the node connection area, which improves the energy-dissipating capacity of the structure, and the quantity, specification and action timing can be designed according to different anti-seismic grades to achieve graded anti-seismic, which is convenient and flexible. The energy dissipation rod can be disassembled, which is convenient for replacement and treatment, and is beneficial for post-earthquake repair.

Description of drawings

Fig. 1 is the schematic diagram of prefabricated concrete beam of the present invention;

Fig. 2 is the sectional view of Fig. 1;

Fig. 3 is a schematic diagram of a prestressed assembled energy-dissipating beam-column node of the present invention;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is a schematic diagram of the detachable energy dissipation rod of the present invention;

Fig. 6 is the schematic diagram of fixed iron part of the present invention;

Fig. 7 is a schematic diagram of the anchoring sleeve of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1-4: the upper and lower sections of the precast concrete beam 1 are provided with pre-tensioned prestressed tendons 2 according to the calculation requirements, and are made by the long-line method pedestal; the prestressed tendon channel 3 is left at the middle position of the section height of the end of the beam, Left and right symmetrical layout, its length is reasonably calculated according to the deformation requirements of the prestressed tendon; the tail of the prestressed tendon channel 3 is bent to the side of the beam, leaving space 4 for tensioning and anchoring of the prestressed tendon. There is a corbel 5 at the lower part of the beam end section, and a pressure-bearing end plate 6 is set at the position of the corbel, and the stirrups 7 at the corbel and nearby positions are encrypted; it is used to fix the removable energy-dissipating rod The fixed iron parts 9 of 8 are pre-embedded on the upper and lower surfaces of the precast concrete beam 1.

Precast concrete columns 10 reserve prestressed tendon channels 11 and corbels 12 in the beam-column connection area, and anchor sleeves 13 for connecting removable energy dissipation rods 8 are pre-embedded on the columns and corbels 12; the precast concrete beams 1 are put on hold On the corbel 12 of the prefabricated concrete column 10, the prestressed tendon 14 passes through the prestressed tendon channel 11 of the precast concrete column 10 and the prestressed tendon channel 3 at the end of the precast concrete beam 1, and then the prestressed tendon 14 is stretched, passed through Post-tensioning prestressing is to crimp the precast concrete column 10 and the precast concrete beam 1 into one; the two ends of the prestressed tendon 14 are anchored by the prestressed anchor 15; the detachable energy dissipation rods 8 are installed on the upper and lower surfaces of the precast concrete beam 1; The upper surface of the prefabricated concrete beam 1 is superimposed with cast-in-place concrete 16 within the height range of the floor slab; the exposed part of the detachable and replaceable energy dissipation rod 8 located below is encapsulated in it by mortar 17 .

As shown in Figure 5: the detachable energy-dissipating rods 8 are installed on the upper and lower surfaces of the precast concrete in the form of a group of multiple detachable energy-dissipating rods of different specifications, and the yielding is achieved step by step according to different seismic levels. The role of energy dissipation; the removable energy dissipation rod 8 is composed of a mild steel rod 18, an anti-buckling sleeve 19, a nut 20, an anchor sleeve 13 and a fixed iron piece 9; the mild steel rod 18 is made of low-yield steel, and one end There is a short thread section, and the other end is provided with a long thread section, and the thread is formed by rolling; the short thread end is screwed into the anchor sleeve 13, and the long thread end is connected to the fixed iron piece 9 through two nuts 20, between the two nuts 20 The U-shaped notch of the fixed iron piece can be clamped or a gap can be reserved according to needs, and the size of the gap can be designed according to the action timing of different seismic levels; the anti-buckling sleeve 19 is made of ordinary round steel pipe, and its inner diameter is larger than that of the mild steel The diameter of the rod is 1-5mm, which is set on the soft steel rod 18; the anchor sleeve 13 is pre-embedded on the precast concrete column 10 and the corbel 12 of the precast concrete column; the fixing iron part 9 is pre-embedded on the upper and lower surfaces of the end of the precast concrete beam 1 .

As shown in FIG. 6 : the fixed iron piece 9 is composed of an angle iron 21 , a shear key 22 and a stiffener 23 . A U-shaped notch is left on one side of the angle iron 21, and the width of the notch is larger than the diameter of the soft steel rod and smaller than the size of the nut; the shear key 22 is welded to the bottom surface of the other side of the angle iron 21, and the shear key 22 is buried in the precast concrete; Stiffeners 23 are welded to both ends of the inner side of the angle iron 21 .

As shown in Figure 7: one end of the anchor sleeve 13 is provided with an internal thread 24, the size of which matches the thread of the mild steel rod 18, and the other end is provided with holes perpendicular to each other, passing through two transverse steel rods 25 for strengthening Anchoring ability.

When installing the detachable energy-consuming rod 8, first put the anti-buckling sleeve 19 on the mild steel rod 18, install the nut 20 on the long threaded end of the mild steel rod 18, and then snap the long threaded end of the mild steel rod 18 into the Fix the U-shaped notch of the iron piece 9, screw the short threaded end into the anchor sleeve 13, and finally tighten the nut 20, or reserve a gap; the removal process is opposite to the installation process.

It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components that are not specified in this embodiment can be realized by existing technologies.

Claims (3)

1. a kind of local prestressing force assembled energy-dissipation beam column node, it is characterised in that：Including precast concrete column, precast concrete Beam, presstressed reinforcing steel, prestressed anchor and replaceable power consumption rod；

The precast concrete column reserves presstressed reinforcing steel duct and bracket in beam-to-column joint area, and the bracket consumes in the replaceable Can rod installed position reserving hole channel, for through the replaceable consume energy rod；

The precast concrete beam is pretensioned prestressed concrete girder, and section upper and lower part sets pre-tensioned prestressing muscle；It is described prefabricated Prestressed pore passage is reserved in beams of concrete end, in the middle of beam section height, is symmetrically arranged；The presstressed reinforcing steel duct tail Portion is bent to beam sides, reserves tension of prestressed tendon and anchoring space；Leave ox in the precast concrete beam end cross-sectional bottom Leg tongue and groove；

The precast concrete beam ends rest is on the bracket of the precast concrete column；The presstressed reinforcing steel passes through described pre- The presstressed reinforcing steel duct of concrete column processed and the precast concrete beam end, one is crimped into by post-tensioned prestressing by the two Body；The presstressed reinforcing steel two ends are anchored by the anchorage；The precast concrete beam upper surface is in FFL scope Interior overlapping cast-in-place concrete；

The replaceable power consumption rod is installed on the precast concrete beam upper and lower surface, and one end connects the precast concrete column, The other end connects precast concrete beam；

Pressure-bearing end plate is set at the bracket tongue and groove position, and encrypts the stirrup at bracket tongue and groove and neighbouring position；

When the replaceable power consumption rod is located at the precast concrete beam upper surface, poured in cast-in-place concrete, under being located at During surface, through the preformed hole of the bracket, exposed portion is coated by mortar；

The replaceable power consumption rod includes mild steel bar, anti-buckling sleeve, anchoring sleeve, nut and fixing iron member；The anti-surrender Sleeve is enclosed in the mild steel bar；The anchoring sleeve is embedded in precast concrete column in advance, one end be provided with internal thread, its size with The screw thread of the mild steel bar matches, and the other end is provided with orthogonal hole, through two horizontal rod irons；The fixing iron member is pre- It is embedded in precast prestressed concrete beam end upper and lower surface；Described mild steel bar one end is provided with short thread segments, and the other end sets long thread segment, It is threaded through rolling to be formed so that thread segment intensity is higher than normal reach；Short thread end is screwed into the anchoring sleeve, and the long end of thread leads to Two nuts are crossed to be connected on the fixing iron member.

2. a kind of local prestressing force assembled energy-dissipation beam column node according to claim 1, it is characterised in that：The fixation Ironware includes angle bar, shear connector and ribbed stiffener, and U-shaped breach is left in the angle bar side, and it is straight that gap width is more than the mild steel bar Footpath, less than the nut size；The shear connector is welded in the angle bar opposite side bottom surface；The shear connector is embedded in concrete Among soil；The ribbed stiffener is welded in two ends on the inside of angle bar.

3. a kind of local prestressing force assembled energy-dissipation beam column node according to claim 1, it is characterised in that：It is described anti-in the wrong Take sleeve to be made up of smooth bar pipe, internal diameter is more than the mild steel bar diameter 1-5mm, and the mild steel bar is using low surrender steel system Into the quantity of the nut is 2-4, and two nuts close to the fixing iron member clamp the U-shaped breach of the fixing iron member Place or preset clearance.