CN102539094B - Bridge testing support capable of changing use function - Google Patents

Abstract

The invention belongs to the field of bridge test equipment, in particular to a bridge test support capable of changing the use function. Including the pier cap and the support, the pier cap is fixedly connected with the bridge pier through bolts, and the support is fixedly connected with the pier cap through bolts; The shape of the screw holes on the lug plate and the use of bolts are divided into three types: fixed hinge support, movable hinge support and rigid support; pier caps are divided into two-end pier caps and middle pier caps that can be used alone or in combination. Works with sliced piers to vary the stiffness of the pier. In order to improve the singleness of the structural function of the bridge test support, to achieve multiple functions for one pier, and to improve the test efficiency, the structure of the support itself is changed through bolts, so as to achieve the function of changing the overall force of the bridge structure, which can be quickly and effectively realized by Change from continuous girder to continuous rigid frame bridge or from continuous rigid frame bridge to continuous girder bridge.

Description

A bridge test support capable of changing the function of use

technical field

The invention belongs to the field of bridge test equipment, in particular to a bridge test support capable of changing the use function.

Background technique

At present, the bearings used for bridge tests are basically single fixed hinge bearings or movable hinge bearings, with a single function. When conducting bridge tests, if it is necessary to change the stress system of the bridge structure, such as changing from a continuous girder bridge to a continuous rigid frame bridge, it is often necessary to replace the bridge support or re-pour the bridge piers, which not only takes a lot of time, but also increases the cost of the test . The existing bridge test bearings cannot change the overall stress system of the bridge structure through the change of their own functions. Moreover, the bridge piers of the existing test beams are also of single fixed stiffness, and it is not possible to carry out relevant comparative tests on the changes in the stiffness ratio of the piers to the beams.

Contents of the invention

In order to improve the singleness of the structural function of the bridge test support, achieve multiple uses of one pier, and improve test efficiency, this device provides a bridge test support that can change the use function, and the structure of the support itself can be changed through bolts to achieve To achieve the function of changing the overall force of the bridge structure, it can quickly and effectively realize the change from continuous beam to continuous rigid frame bridge or continuous rigid frame bridge to continuous beam bridge, and the stiffness of the pier can be changed with the use of sliced piers.

The technical scheme adopted in the present invention is:

The test support includes a pier cap and a support, the pier cap is fixedly connected to the pier by bolts, and the support is fixedly connected to the pier cap by bolts.

The support is divided into two parts, the upper base plate and the lower base plate. Two parallel upper ear plates are arranged at both ends of the lower surface of the upper base plate, and two parallel lower ear plates are respectively arranged at both ends of the upper surface of the lower base plate. The two lower ear plates cooperate with the upper ear plates opposite to each other on the left and right sides respectively.

The support is divided into three types: fixed hinge support, movable hinge support and rigid support:

The upper ear plate and the lower ear plate of the support are respectively provided with three screw holes opposite to each other; the upper base plate and the lower base plate are connected by bolts through the screw holes in the middle of the upper and lower ear plates to form a fixed hinge support;

An oblong hole in the middle and two screw holes on both sides of the oblong hole are respectively set on the upper ear plate and the lower ear plate of the support; The circular holes are connected by bolts to form a movable hinge support;

The upper bottom plate and the lower bottom plate of the fixed hinge support are bolted through the three screw holes of the upper and lower ear plates, or the upper and lower bottom plates of the movable hinge support are connected through the oblong holes of the upper and lower ear plates and the screws at both ends. The holes are bolted to form a rigid support.

The pier caps are divided into two-end pier caps and middle pier caps; the hinged support is connected to both end pier caps, or to the middle pier cap, or to both ends of the pier cap and the middle pier cap at the same time. , to realize the change of pier stiffness.

The beneficial effects of the present invention are:

The device of the invention is simple and easy to operate; it has multiple functions, and by changing different combinations of pier caps, it can simulate the relevant test content of the bridge at different pier-beam stiffness ratios; it can simulate continuous beams and continuous rigid frame bridges without re-pouring pier Functions: It can quickly realize the conversion of the continuous beam bridge and the continuous rigid frame bridge stress system; it can simulate the test content of piers with different stiffnesses, overcoming the limitation of single stiffness of bridge piers in previous bridge tests; it can improve test efficiency and save test costs.

Description of drawings

Figure 1(a), Figure 1(b) and Figure 1(c) are the front view, top view and side view of the bottom plate on the fixed hinge support respectively;

Figure 2(a), Figure 2(b) and Figure 2(c) are the front view, top view and side view of the bottom plate of the fixed hinge support respectively;

Figure 3(a), Figure 3(b) and Figure 3(c) are the front view, top view and side view of the bottom plate on the movable hinge support respectively;

Figure 4(a), Figure 4(b) and Figure 4(c) are the front view, top view and side view of the bottom plate of the movable hinge support respectively;

Figure 5(a), Figure 5(b) and Figure 5(c) are the front view, top view and side view of the pier caps at both ends;

Figure 6(a), Figure 6(b) and Figure 6(c) are the front view, top view and side view of the middle pier cap respectively;

Fig. 7 is a schematic diagram of a fixed hinge support;

Figure 8 is a schematic diagram of changing the fixed hinge support to a rigid support;

Fig. 9 is a schematic diagram of a movable hinge support;

Figure 10 is a schematic diagram of changing the movable hinge support to a rigid support;

Figure 11 is a schematic diagram of the connection between the fixed hinge support, the middle pier cap + both end pier caps and the segmented pier;

Figure 12 is a schematic diagram of the connection between the fixed hinge support, the intermediate pier cap and the segmented pier;

Figure 13 is a schematic diagram of the connection between the fixed hinge support, the pier caps at both ends and the segmented pier.

Labels in the figure:

1- upper bottom plate; 21- upper ear plate; 22- lower ear plate; 3- rib plate; 4- lower bottom plate.

Detailed ways

The present invention provides a bridge test support capable of changing the use function. The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1-6, the bridge test bearing consists of two parts, the pier cap and the support. The pier cap is fixedly connected to the pier by bolts, and the support is fixedly connected to the pier cap by bolts.

The support is divided into two parts, the upper base plate 1 and the lower base plate 4. Two parallel upper lugs 21 are arranged at both ends of the lower surface of the upper base plate 1, and two parallel lower lugs are respectively arranged at both ends of the upper surface of the lower base plate 4. plate 22, the two lower lug plates 22 on the left and right sides cooperate with the upper lug plate 21 on the left and right sides respectively. A plurality of ribs 3 are provided on both sides of the upper ear plate 21 and the lower ear plate 22 . The upper bottom plate 1 is connected with the beam through the top steel bar.

The support is divided into three types: fixed hinge support, movable hinge support and rigid support:

The upper lug plate 21 and the lower lug plate 22 of the support are respectively provided with three opposite screw holes; the upper base plate 1 and the lower base plate 4 are bolted through the screw holes in the middle of the upper and lower lug plates to form a fixed hinge support. As shown in Figure 7.

One oblong hole in the middle and two screw holes on both sides of the oblong hole are respectively arranged on the upper ear plate 21 and the lower ear plate 22 of the support; The oblong hole in the middle of the plate is bolted to form a movable hinge support, as shown in Figure 9.

The upper bottom plate 1 and the lower bottom plate 4 of the fixed hinge support are bolted through 3 screw holes of the upper and lower ear plates, or the upper bottom plate 1 and the lower bottom plate 4 of the movable hinge support are passed through the oblong holes of the upper and lower ear plates And the screw holes at both ends are bolted to form a rigid support, as shown in Figure 8 and Figure 10.

Pier caps are divided into two-end pier caps and middle pier caps; the hinged support is connected with both ends of the pier caps, or with the middle pier cap, or with both ends of the pier cap and the middle pier cap at the same time, and cooperates with the split pier to realize Changes in pier stiffness.

Example: Experimental Study on Longitudinal Dynamic Characteristics of a Rigid Frame Bridge with Corrugated Steel Webs

In order to study the effect of pier stiffness on the longitudinal dynamic characteristics of a continuous rigid frame bridge with corrugated steel webs, the test model includes test beams and piers. The test beams are three-span variable-section beams, one of which is a corrugated steel web composite box girder, and the other is a concrete box girder, numbered L1# and L2# respectively; in order to simulate different pier-beam stiffness ratios, the The piers of sliced piers use different combinations of pier caps to change the cross section of the pier; the connection between the test beam and the pier is realized through fixed hinge supports and pier caps.

The pier includes the anchoring part and the pier body. In order to change the section of the pier, that is, to change the stiffness of the pier, the pier is composed of three thin-walled piers. The same, both are 500mm, and the height is the same as 800mm. The sum of the area of the middle section + the two ends of the pier is A1, the area of the middle section is A2, and the sum of the areas of the two ends is A3. The connection of fixed hinge support, pier cap and pier is shown in Figure 11, Figure 12 and Figure 13 respectively.

By performing modal analysis on the random sampling data of each working condition with the time-domain method, the fundamental natural frequency of each working condition in the longitudinal direction of the continuous rigid frame bridge model is finally obtained, as shown in Table 1.

Table 1 Measured values of natural frequency in the longitudinal bridge direction

According to the design dimensions of the continuous rigid frame bridge test model, the unit models of the corrugated steel web continuous rigid frame bridge and the concrete continuous rigid frame bridge were respectively established by using the finite element software MIDAS. Connection, simulating rigid connection of piers and beams. The natural vibration frequencies of the continuous rigid frame bridge in the longitudinal direction of the bridge were calculated at different beam-to-pier stiffness ratios, and compared with the measured values, as shown in Table 2.

Table 2 Comparison of calculated and measured natural frequency in the longitudinal bridge direction

It can be seen that the device can effectively simulate the situation of the continuous rigid frame bridge, and the performance of the variable stiffness pier has been reflected in the test.

Claims (1)

1. can change a bridge testing support for using function, comprise pier cap and bearing, it is characterized in that:

Pier cap is fixedly connected with bridge pier by bolt, and bearing is fixedly connected with pier cap by bolt;

Bearing is divided into upper plate (1) and lower shoe (4) two parts, the two ends of upper plate (1) lower surface arrange two upper ear plates be parallel to each other (21), the two ends of lower shoe (4) upper surface respectively arrange two lower ear plates be parallel to each other (22), and relative with position, the left and right sides respectively upper ear plate (21) of two, left and right sides lower ear plate (22) coordinates; Upper ear plate (21) arranges many floors with the both sides of lower ear plate (22);

Described bearing is divided into fixed-hinged support, moveable hinge bearing and rigid mount three kinds of forms:

The upper ear plate (21) of bearing arranges the relative screw in 3 positions respectively with on lower ear plate (22); Carry out bolt by the screw in the middle of upper lower ear plate between upper plate (1) with lower shoe (4) to be connected, form fixed-hinged support;

The upper ear plate (21) of bearing and lower ear plate (22) are arranged respectively 1 and be positioned at the screw that middle Long Circle hole and 2 are positioned at both sides, Long Circle hole; Carry out bolt by the Long Circle hole in the middle of upper lower ear plate between upper plate (1) with lower shoe (4) to be connected, form moveable hinge bearing;

The upper plate (1) of fixed-hinged support with carry out bolt by upper lower ear plate 3 screws between lower shoe (4) and be connected, or carry out bolt by the Long Circle hole of upper lower ear plate and two ends screw between the upper plate of moveable hinge bearing (1) with lower shoe (4) to be connected, form rigid mount;

Described pier cap is divided into two ends pier cap and middle pier cap; Bearing is connected with two ends pier cap or is connected with middle pier cap or is connected with two ends pier cap and middle pier cap simultaneously, coordinates split blade type bridge pier, realizes the change of pier stiffness.