CN102401765B - Lateral restraint device for loading test of steel structure compression members - Google Patents

Abstract

The invention belongs to the technical field of structural engineering steel structures, and in particular relates to a lateral restraint device for loading tests of compression members of steel structures. The inner flanges of the front and rear two supporting beams are opposite and parallel to each other, the inner flanges of the left and right self-balancing beams are opposite and respectively connected with the left and right ends of the two supporting beams with bolts to form a rectangular self-balancing reaction frame, and two specimen splints The fronts of the supporting beams face each other and are parallel to each other, respectively fix them in the middle of the inner flanges of the two supporting beams with 4 splint screws and matching nuts, and adjust the distance between the 2 test piece splints by adjusting the matching nuts, and the screw clamp base is fixed. On the outer flange of the supporting beam, the lead screw clamp is fixedly connected to the base of the lead screw clamp, the lead screw clamp is clamped on the lead screw of the long column pressure testing machine, and the self-balancing reaction force frame is horizontally placed between the lead screws, 2 pieces The specimen clamp clamps the sides of the specimen. The invention realizes the effective lateral support outside the instability plane of the pressure test piece, and is suitable for the overall stability performance test research of the pressure component.

Description

Lateral restraint device for loading test of steel structure compression members

technical field

The invention belongs to the technical field of structural engineering steel structures, and in particular relates to a lateral restraint device for loading tests of compression members of steel structures.

Background technique

The overall stability of steel structure compression members is one of the most important research topics in the field of steel structure, and long-column compression testing machines are usually used for experimental research. In the absence of lateral bracing, steel columns in compression usually lose stability about the weak axis of the section. In order to study the overall stability of the steel column around the strong axis, the necessary lateral support conditions must be provided, and the calculated length of the steel column around the weak axis can be reduced to ensure that the instability around the strong axis occurs. However, the long-column compression testing machine does not provide a lateral support device, and it is often necessary to arrange a large-scale support and reaction frame around it during the test, but the installation of the reaction frame is difficult, the number of supports is limited, and a large site is required. The laboratory cannot even arrange a large reaction force frame. How to design a lateral support device that can effectively provide lateral support and at the same time have the characteristics of convenient installation, adjustable size, simple assembly, and small size is an urgent problem to be solved in scientific research and engineering practice.

Contents of the invention

The purpose of the present invention is to solve the problem of the lateral support device when the long column pressure testing machine described in the background technology performs the loading test of the steel structure compression member, and to provide a lateral restraint device for the loading test of the steel structure compression member, which is characterized in that , the lateral restraint device of the steel structure compression member loading test is a detachable structure, which is composed of screw clamp 1, supporting beam 2, self-balancing beam 3, screw clamp base 4, specimen splint 5 and splint screw 6, supporting The beam 2 and the self-balancing beam 3 are both H-shaped steel structures. There are 4 holes in the middle of the inner flange of the supporting beam 2. The two inner flanges of the supporting beam 2 at the front and rear are opposite and parallel to each other. The side flanges are opposite to each other and respectively bolted to the left and right ends of the two front and rear support beams 2 to form a rectangular self-balancing reaction frame. Four splint screws 6 are vertically fixed at the four corners of the back of the specimen splint 5. Two specimen splints 5. Between the two supporting beams 2, the front faces are relatively parallel to each other, and the four splint screws 6 and the two supporting nuts of each splint screw 6 are fixed to the two supporting beams through the four holes in the middle of the inner flange of the supporting beam 2. 2. In the middle of the inner flange, adjust the distance between the two test piece splints 5 by adjusting the supporting nuts, and place them horizontally and symmetrically between the four lead screws 9 of the long column pressure testing machine according to the self-balancing reaction frame. On a support beam 2, two lead screw card bases 4 are respectively fixed on the outer flanges of the support beam 2 at the corresponding positions of the two lead screws 9, and the lead screw card 1 connects with the lead screw card base through the fixed deck 103. 4 fixed connection;

In the supporting beam 2, the transverse stiffeners 7 are fixed on both sides of the web, and the two ends of the supporting beam 2 are provided with cover plates for bolt connection with the self-balancing beam 3;

In the self-balancing beam 3, transverse stiffeners 7 are fixed on both sides of the web;

Described lead screw card 1 is made up of movable card 101, fixed card 102 and fixed card seat 103, and movable card 101 and fixed card 102 are respectively the same semicircular ring with the leading screw 9 diameters of long column pressure testing machine, and fixed card 102 The outer side is affixed to the arc surface of the fixed card holder 103, the two sides of the fixed card holder 103 are welded with stiffeners, and the movable card 101 and the fixed card 102 are connected by bolts;

A polytetrafluoroethylene plate is arranged on the front side of the test piece splint 5 to reduce the friction between the test piece splint 5 and the test piece 8 .

The beneficial effects of the present invention are:

(1) The structure is simple, easy to process and low in cost;

(2) The size of the specimen splint is adjustable, suitable for compression steel columns of different cross-sectional sizes;

(3) The fixed height on the lead screw of the long column compression testing machine is adjustable, suitable for compression steel columns of different heights, and multiple sets of steel structure compression members can be used to load test lateral restraint devices at the same time;

(4) The device is self-balancing and can withstand large lateral horizontal loads, while effectively preventing it from being transmitted to the screw of the testing machine;

(5) The polytetrafluoroethylene plate on the support plate can reduce the friction between the device and the components.

Description of drawings

Fig. 1 is the schematic plan view of the structure of the embodiment of the lateral restraint device of the steel structure compression member loading test;

Fig. 2 is a structural sectional view along the A-A direction of Fig. 1;

Fig. 3 is a structural sectional view along the B-B direction of Fig. 1;

Fig. 4 is a schematic structural diagram of the lead screw card.

In the figure, 1--lead screw card, 101--movable card, 102--fixed card, 103--fixed card seat, 2--supporting beam, 7--transverse stiffener, 3--self-balancing beam, 4 -- screw card base, 5 -- specimen splint, 6 -- splint screw, 7 -- transverse stiffener, 8 -- test piece, 9 -- lead screw.

Detailed ways

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

Fig. 1 is a schematic top view of an embodiment of a lateral restraint device for a loading test of a steel structure compression member, and Fig. 2 and Fig. 3 are a structural sectional view along the A-A direction and a structural sectional view along the B-B direction of Fig. 1, respectively. The lateral restraint device of the steel structure compression member loading test is a detachable structure, which consists of a screw clamp 1, a supporting beam 2, a self-balancing beam 3, a screw clamp base 4, a specimen splint 5 and a splint screw 6. Both the support beam 2 and the self-balancing beam 3 are H-shaped steel structures. There are 4 holes in the middle part of the inner flange of the supporting beam 2. The inner flanges of the front and rear two supporting beams 2 are opposite and parallel to each other, and the inner flanges of the left and right self-balancing beams 3 are opposite and respectively connected with the left and right ends of the front and rear supporting beams 2 to form a rectangular self-balancing reaction frame. Four splint screws 6 are fixed vertically at the four corners of the back of the test piece splint 5, and the fronts of the two test piece splints 5 are relatively parallel to each other between the two support beams 2, and the four splint screw rods 6 and each splint screw rod 6 are used respectively. The two matching nuts are fixed to the middle of the inner flanges of the two supporting beams 2 through the four holes in the middle of the inner flanges of the supporting beams 2, and the distance between the two test piece splints 5 is adjusted by adjusting the matching nuts. The front side of the test piece splint 5 is set One layer of polytetrafluoroethylene plate is used to reduce the friction between the specimen splint 5 and the specimen 8. Place the self-balancing reaction frame horizontally and symmetrically between the four lead screws 9 of the long-column pressure testing machine. The corresponding position of 9 is affixed to the outer flange of the support beam 2, and the lead screw card 1 is affixed to the lead screw card base 4 through the fixed card seat 103.

In order to improve the strength of the supporting beam 2 and the self-balancing beam 3 , transverse stiffeners 7 are affixed to both sides of the webs of the supporting beam 2 and the self-balancing beam 3 . The two ends of the support beam 2 are provided with cover plates for bolt connection with the self-balancing beam 3 .

As shown in Figure 4, the lead screw card 1 is composed of a movable card 101, a fixed card 102 and a fixed card seat 103, and the movable card 101 and the fixed card 102 are respectively semicircular rings with the same diameter as the lead screw 9 of the long column pressure testing machine. , the outer side of the fixed card 102 is affixed to the arc surface of the fixed card seat 103, the two sides of the fixed card seat 103 are welded with stiffeners, and the movable card 101 and the fixed card 102 are connected by bolts.

The steps to use the lateral restraint device in the loading test of the steel structure compression member for the overall stability performance test of the compression steel column specimen are as follows:

First, the lead screw clamp 1 is clamped on the four lead screws 9 of the long column pressure testing machine according to the test design height of the test piece 8, so that the support beam 2 is fixed on the lead screws 9 of the long column pressure test machine, and the support beam 2 bears Lateral horizontal loads on steel columns;

Then, the two self-balancing beams 3 and the two supporting beams 2 are assembled into a whole through bolts to form a self-balancing reaction frame. The function of the self-balancing beam 3 is to balance the reaction force of the supporting beam 2, so as to prevent the load from being transmitted to the long column Lead screw 9 of the pressure testing machine;

Finally, the test piece splint 5 is assembled to the middle of the inner flange of the support beam 2 through four splint screws 6 and matching nuts, and the position of the test piece splint 5 is adjusted through the nuts until it is tightly pressed against the side of the test piece 8 .

The fixed height of the whole device and the adjustable distance between the two specimen splints 5 are applicable to the compression test of steel column specimens with different heights and cross-sectional sizes.

Aiming at the problem that the existing long column pressure testing machine cannot provide lateral support for the steel column under pressure, the present invention proposes a new type of lateral support device, which realizes the compression on the basis of no need for a large supporting reaction force frame The effective lateral support outside the instability plane of the steel column specimen, and its size is flexible and adjustable, has strong practicability and economy, can meet the needs of experimental research work, and is suitable for the overall stability performance experimental research of compression members.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (5)

1. lateral restraining device for load test of steel-structure compression member, it is characterized in that, lateral restraining device for load test of steel-structure compression member is demountable structure, by leading screw card (1), supporting traverse (2), self-equilibrating crossbeam (3), leading screw card pedestal (4), specimen splint (5) and clamping plate screw rod (6) consist of, supporting traverse (2) and self-equilibrating crossbeam (3) are H type i-beam structure, there are 4 holes at middle part, the inboard edge of a wing of supporting traverse (2), the inboard edge of a wing of 2 supporting traverses (2), front and back is relatively also parallel to each other, the self-balancing reaction frame that 2 self-equilibrating crossbeams (3) inboard edge of a wing, left and right relatively and respectively connects and composes rectangle with left end and the right-hand member bolt of 2 supporting traverses in front and back (2), 4 clamping plate screw rods (6) vertically are fixed in the Si Jiaochu at specimen splint (5) back side, parallel to each other and 2 matching nuts using respectively 4 clamping plate screw rods (6) and each clamping plate screw rod (6) of 2 specimen splints (5) vis-a-vis between 2 supporting traverses (2) are fixed on middle part, the inboard edge of a wing of 2 supporting traverses (2) by 4 holes at middle part, the inboard edge of a wing of supporting traverse (2), adjust the spacing of 2 specimen splints (5) by regulating matching nut, self-balancing reaction frame horizontal positioned and left-right symmetric are placed in the position between 4 leading screws (9) of long column pressure testing machine, on each supporting traverse (2), 2 leading screw card pedestals (4) are fixed on supporting traverse (2) outer side wing edge at the correspondence position of 2 leading screws (9) respectively, leading screw card (1) is affixed by Fixing clamp-seat (103) and leading screw card pedestal (4).

2. a kind of lateral restraining device for load test of steel-structure compression member according to claim 1, it is characterized in that, in described supporting traverse (2), the affixed transverse stiffeners in web both sides (7), supporting traverse (2) two ends arrange the end socket cover plate and are used for being connected 3 with the self-equilibrating crossbeam) the bolt connection.

3. a kind of lateral restraining device for load test of steel-structure compression member according to claim 1, is characterized in that, in described self-equilibrating crossbeam (3), and the affixed transverse stiffeners in web both sides (7).

4. a kind of lateral restraining device for load test of steel-structure compression member according to claim 1, it is characterized in that, described leading screw card (1) is comprised of active card (101), fixed card (102) and Fixing clamp-seat (103), active card (101) is respectively the semicircular ring identical with leading screw (9) diameter of long column pressure testing machine with fixed card (102), the arc surface of fixed card (102) outside and Fixing clamp-seat (103) is affixed, weld ribbed stiffener on the two sides of Fixing clamp-seat (103), active card (101) is connected 102 with fixed card) be that bolt connects.

5. a kind of lateral restraining device for load test of steel-structure compression member according to claim 1, is characterized in that, the front of described specimen splint (5) arranges one deck polyfluortetraethylene plate, to reduce the friction force between specimen splint (5) and test specimen (8).

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