CN110704936B - Design method of test model for testing bending local damage of steel-concrete combined section - Google Patents
Design method of test model for testing bending local damage of steel-concrete combined section Download PDFInfo
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Abstract
The invention relates to a design method of a test model for testing bending local damage of a steel-concrete joint section. During design, the sizes of a test top plate and a test bottom plate of the steel-concrete combined test section are consistent with the sizes of corresponding parts in an original structure, and the thicknesses of the test parts connected with the test top plate and the test bottom plate are consistent with the thicknesses of the parts at corresponding positions in the original structure, so that the structural sizes and materials of the newly designed test structure and the original structure at the position with the most adverse stress are completely the same; the stress state of the original structure can be truly reflected by ensuring that the stress ratio of the upper edge and the lower edge of the cross section of the test structure is consistent with the original structure, and the actual failure form of the key failure part in the steel-concrete combined section is obtained. According to the invention, the test piece with small section size is adopted to replace the original structure with large section size, so that the steel-concrete combined test section can be damaged under the condition of applying smaller load, and the power consumption and the manufacturing cost are saved; the size of the secondary part component can be locally freely adjusted, and the implementation is convenient.
Description
Technical Field
The invention relates to the field of building structure testing, in particular to a design method of a test model for testing bending local damage of a steel-concrete joint section.
Background
The steel-concrete combined section in the bridge is a key part for connecting a steel structure and a concrete structure, the design of the part needs to be strengthened in order to ensure the stress safety of the connecting part, the stress condition of the combined section is difficult to calculate and analyze really by the traditional calculation theory, and the stress performance of the combined section is often tested by means of a test method. However, due to the large overall size of the structure of the joint section, reports on the failure mechanism of the joint section through full-scale tests are not available, and the scale model tests of the joint section are widely used at present.
The existing combined section scale model is usually scaled down according to the proportion of 1 to 1.
Therefore, the invention provides a design method of a test model for testing the local real bending damage of the steel-concrete combined section. The method can achieve the purpose of truly reflecting the structure true stress of the most unfavorable part of the stress of the steel-concrete combined section.
Disclosure of Invention
Therefore, a design method of a test model for testing the bending local damage of the steel-concrete joint section is needed to be provided aiming at the problem that the stress condition of the steel-concrete joint section cannot be truly reflected by the existing scale model test.
A design method of a test model for testing bending local damage of a steel-concrete combined section comprises the following steps:
calculating the upper edge stress sigma of the top plate of the steel-concrete combined section of the original structure under the action of positive bending moment M On the upper part And lower edge stress σ of the base plate Lower part (ii) a The above-mentioned
Wherein, I 0 Is the cross-sectional moment of inertia, H, of the steel-concrete joint section Upper part of Is the distance of the upper edge from the neutral axis of the cross-section, H Lower part Is the distance of the lower edge from the neutral axis of the cross section;
designing a mixed beam structure test model, wherein the mixed beam structure test model comprises a steel-concrete combined test section in the longitudinal bridge direction, and the length of the steel-concrete combined test section is the same as that of the steel-concrete combined section in the original structure; the steel-concrete combined test section comprises an upper test grid chamber and a lower test grid chamber which are arranged in parallel up and down and correspond to the upper grid chamber and the lower grid chamber in the original structure, the upper surface of the upper test grid chamber is provided with a test top plate corresponding to the top plate of the upper grid chamber, and the lower surface of the lower test grid chamber is provided with a test bottom plate corresponding to the bottom plate of the lower grid chamber; setting the sizes of the test top plate and the test bottom plate to be the same as the sizes of the top plate and the bottom plate in the original structure respectively, wherein the mixed beam structure test model is the same as the concrete material in the original structure; the thickness of a test part connected with the test top plate and/or the test bottom plate in the steel-concrete combined test section is consistent with that of a corresponding part in an original structure;
presetting the total height H0' of the cross section of the mixed beam structure test model to be smaller than the total height H0 of the cross section in the original structure, wherein the net distance H2' between the upper test grid chamber and the lower test grid chamber is smaller than the net distance H2 between the upper grid chamber and the lower grid chamber in the original structure, and the height H1' of the upper test grid chamber is smaller than the height H1 of the upper grid chamber; the height H3' of the lower test cell is less than the height H3 of the lower cell;
setting values of the height H1 'of the upper test cell, the net distance H2' between the upper test cell and the lower test cell, and the height H3 'of the lower test cell so that the mixed beam structure test model is subjected to the positive bending moment M' to test the upper edge stress sigma 'of the top plate' On the upper part And lower edge stress sigma 'of test base plate' Lower part Is the same as the stress ratio of the upper and lower edges of the original structure, i.e.
Due to said->
Wherein, I' 0 Is the cross-sectional inertia moment of the steel-concrete combined test section, the distance from the upper edge of the steel-concrete combined test section to the neutral axis of the cross section is on H', and the distance from the upper edge of the steel-concrete combined test section to the neutral axis of the cross section is under HThe lower edge is at a distance from the neutral axis of the cross section, i.e. such that->
In one embodiment, the test part connected with the test top plate or the test bottom plate in the steel-concrete combination test section comprises: and the test partition plates correspond to the partition plates in the original structure, are arranged in the upper test cell chamber and/or the lower test cell chamber, and have the same thickness as the partition plates at the corresponding positions in the original structure.
In one embodiment, the steel-concrete combined test section further comprises an outer test welding nail connected with the test top plate or the test bottom plate, the outer test welding nail is arranged in the upper test grid chamber or the lower test grid chamber, and the outer test welding nail is identical to the outer welding nail at the corresponding position in the original structure in specification size and arrangement distance.
In one embodiment, the test part connected with the test top plate and the test bottom plate in the steel-concrete combination test section comprises: with the corresponding experimental end plate of end plate in the primary structure, experimental end plate is located the tip of steel-concrete combination test segment length direction, just experimental end plate with the end plate thickness of corresponding position department in the primary structure is unanimous.
In one embodiment, the hybrid beam structure test model further comprises a concrete beam test section and a steel beam test section, wherein the concrete beam test section, the steel-concrete combination test section and the steel beam test section are respectively corresponding to and sequentially connected with the concrete beam section, the steel-concrete combination section and the steel beam section which are arranged in the original structure in the longitudinal bridge direction.
In one embodiment, the hybrid beam structure test model further includes: the concrete beam transition test section and the steel beam transition test section are arranged between the concrete beam test section and the steel-concrete combination test section in a corresponding mode; the steel beam transition test section and the steel beam transition section in the original structure are correspondingly arranged between the steel-concrete combination test section and the steel beam test section.
In one embodiment, the lower surface of the upper test cell is provided with an upper cell test middle plate corresponding to the position of the upper cell middle plate of the original structure, and the thickness of the upper cell test middle plate is smaller than that of the upper cell.
In one embodiment, the upper surface of the lower test cell is provided with a lower cell test middle plate corresponding to the position of the lower cell middle plate of the original structure, and the thickness of the lower cell test middle plate is smaller than that of the lower cell test middle plate.
In one embodiment, the upper cell test middle plate and/or the lower cell test middle plate is provided with inner test welding nails corresponding to the positions of the inner welding nails on the upper cell middle plate and/or the lower cell middle plate of the original structure.
In one embodiment, the gauge of the inboard test stud is equal to or less than the gauge of the inboard test stud at the corresponding location in the original structure.
The design method of the test model for testing the bending local damage of the steel-concrete combined section at least has the following beneficial technical effects:
the conventional test shows that the steel structure stress at the top plate and the bottom plate is larger than the steel structure stress at other parts, the concrete stress at the connecting position of the top plate and the bottom plate is larger than the concrete stress at other parts, and the most unfavorable stress part of the bent member in the elastic stage is generated at the upper edge and the lower edge of the section of the member, so that the real simulation of the upper edge part and the lower edge part of the steel-concrete combining section is the core of the design of a test model;
the method comprises the steps that firstly, the sizes and the materials of a test top plate and a test bottom plate of a steel-concrete combined test section are consistent with those of corresponding parts in an original structure, the thicknesses of the test parts connected with the test top plate and the test bottom plate are consistent with those of the parts at corresponding positions in the original structure, and a test model is also consistent with a concrete material used in the original structure, so that the structural sizes and the materials of a newly designed test structure and the original structure at the position with the lowest stress are completely the same; h1', H2' and H3' are reduced in size, but the stress ratio of the upper edge and the lower edge of the cross section of the test structure can be ensured to be consistent with the original structure, so that the stress state of the original structure can be truly reflected, and the true failure form of the key failure parts (the upper edge and the lower edge) in the steel-concrete combined section can be obtained;
because the test piece with the small section size is adopted to replace the original structure with the large section size, the steel-concrete combined test section can be damaged under the condition of applying a small load, and the power consumption and the manufacturing cost are saved; meanwhile, the invention can locally and freely adjust the size of the secondary part component (the test part which is not connected with the test top plate and the test bottom plate) which is not damaged, and the implementation is more free and convenient.
Drawings
Fig. 1 is a schematic structural diagram of an original structure of a hybrid beam according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the original structure of the hybrid beam shown in FIG. 1 at A;
FIG. 3 is a schematic structural diagram of a test model of a hybrid beam structure according to an embodiment of the present invention;
fig. 4 is an enlarged schematic view of the test model of the hybrid beam structure shown in fig. 3 at B.
100. The original structure comprises 110, a concrete beam section, 120, a concrete beam transition section, 130, a steel-concrete combination section, 130a, an upper grid chamber, 130b, a lower grid chamber, 131, a top plate, 132, an upper grid chamber middle plate, 133, a lower grid chamber middle plate, 134, a bottom plate, 135, a partition plate, 136, an end plate, 137, an outer side welding nail, 138, an inner side welding nail, 140, a steel beam transition section, 150 and a steel beam section,
200. a test model of a mixed beam structure comprises 210, a concrete beam test section, 220, a concrete beam transition test section, 230, a steel-concrete combination test section, 230a, an upper test grid chamber, 230b, a lower test grid chamber, 231, a test top plate, 232, an upper grid chamber test middle plate, 233, a lower grid chamber test middle plate, 234, a test bottom plate, 235, a test partition plate, 236, a test end plate, 237, an outer side test welding nail, 238, an inner side test welding nail, 240, a steel beam transition test section, 250 and a steel beam test section.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Those of ordinary skill in the art will recognize that variations and modifications of the various embodiments described herein can be made without departing from the scope of the invention, which is defined by the appended claims. Moreover, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In an embodiment of the present invention, a design method of a test model for testing a bending local damage of a reinforced concrete joint section is provided, including:
(1) Referring to fig. 1 and 2, the upper edge stress σ of the top plate 131 under positive bending moment M of the steel-concrete composite segment 130 of the original structure 100 is calculated Upper part of And lower edge stress σ of the base plate 134 Lower part (ii) a The above-mentioned
Wherein, I 0 Is the cross-sectional moment of inertia, H, of the steel-concrete composite section 130 On the upper part Is the distance of the upper edge from the neutral axis of the cross-section, H Lower part Is the distance of the lower edge from the neutral axis of the cross section; the neutral axis refers to: the intersection line between the tension part and the compression part on the cross section of the member to be bent, namely the intersection line between the neutral layer (plane which is not subjected to compression stress and is not subjected to tension stress) of the member and the cross section, and particularly, the position of a stress value of 0 on the cross section measured when the member is bent is the position of the neutral axis.
The steel-concrete combined section 130 comprises an upper grid chamber 130a and a lower grid chamber 130b which are arranged in parallel up and down, wherein the upper surface of the upper grid chamber 130a is provided with a top plate 131, and the lower surface of the lower test grid chamber 130b is provided with a bottom plate 134;
(2) Referring to fig. 3 and 4, designing a hybrid beam structure test model 200, wherein the hybrid beam structure test model 200 comprises a steel-concrete combined test section 230 in a longitudinal bridge direction, and the steel-concrete combined test section 230 has the same length as the steel-concrete combined section 130 in the original structure 100; the steel-concrete bonded test section 230 includes an upper test cell 230a and a lower test cell 230b arranged in parallel up and down corresponding to the positions of the upper cell 130a and the lower cell 130b in the original structure 100, and the upper test cell 230a and the lower test cell 230b are made of concrete materials. A test top plate 231 corresponding to the top plate 131 of the upper chamber 130a is arranged on the upper surface of the upper test chamber 230a, and a test bottom plate 234 corresponding to the bottom plate 134 of the lower chamber 130b is arranged on the lower surface of the lower test chamber 230 b; setting the dimensions of the test top plate 231 and the test bottom plate 234 to be the same as those of the top plate 131 and the bottom plate 134 in the original structure 100, respectively, and the concrete material of the hybrid beam structure test model 200 in the original structure 100; the thickness of the test part connected with the test top plate 231 and/or the test bottom plate 234 in the steel-concrete combined test section 230 is consistent with the thickness of the corresponding part in the original structure 100;
(3) Presetting a total cross-sectional height H0' of the hybrid beam structure test model 200 to be smaller than the total cross-sectional height H0 in the original structure 100, wherein a clear distance H2' between the upper test cell 230a and the lower test cell 230b is smaller than a clear distance H2 between the upper cell 130a and the lower cell 130b in the original structure 100, and a height H1' of the upper test cell 230a is smaller than a height H1 of the upper cell 130 a; the height H3' of the lower test cell 230b is less than the height H3 of the lower cell 130 b;
(4) The height H1' of the upper test cell 230a, the net distance H2' between the upper test cell 230a and the lower test cell 230b, and the height H3' of the lower test cell 230b are set such that the composite beam structure test model 200 produces the upper edge stress σ ' of the test top plate 231 under the positive bending moment M ' On the upper part And lower edge stress σ 'of test baseplate 234' Lower part Is the same as the stress ratio of the upper and lower edges of the original structure 100, i.e.
Is/are>
Wherein, I' 0 Is the cross-sectional moment of inertia, H ', of the steel-concrete bonded test section 230' Upper part of Is the distance, H ', of the upper edge of the steel-concrete bonding test section 230 from the neutral axis of the cross section' Lower part The distance of the lower edge of the steel-concrete combination test section 230 from the neutral axis of the cross-section, i.e. by setting the height H1' of said upper test cell 230a, the clear distance H2' between the upper test cell 230a and the lower test cell 230b and the height H3' of the lower test cell 230b, so that->
Conventional tests show that the concrete stress at the connecting position of the top plate and the bottom plate is greater than that of other parts, and the parts of the bent member which are most unfavorable to stress in the elastic stage are at the upper edge and the lower edge of the section of the member, so that the true simulation of the upper edge and the lower edge of the steel-concrete combined section is the core of the design of a test model;
the method comprises the steps of firstly enabling the sizes of a test top plate 231 and a test bottom plate 234 of a steel-concrete combined test section 230 to be consistent with the sizes of corresponding parts in an original structure, enabling the thicknesses of the test parts connected with the test top plate 231 and the test bottom plate 234 to be consistent with the thicknesses of the parts at corresponding positions in the original structure 100, and enabling a test model to be consistent with a concrete material used in the original structure 100, so that the structural sizes and materials of a newly designed test structure and the original structure at the position with the most adverse stress are the same; h1', H2' and H3' are reduced in size, but the stress ratio of the upper edge and the lower edge of the cross section of the test structure can be ensured to be consistent with the original structure, so that the stress state of the original structure can be reflected, and the real damage form of a key damage part in the steel-concrete combined section can be obtained; because the test piece with the small section size is adopted to replace the original structure with the large section size, the steel-concrete combined test section 230 can be damaged under the condition of applying a small load, and the power consumption and the manufacturing cost are saved; meanwhile, the invention can adjust the size of the secondary part component (the test part which is not connected with the test top plate 231 and the test bottom plate 234) which is not damaged locally freely, and the implementation is more free and convenient.
After the design of the test model 200 of the hybrid beam structure is completed, the concrete tests are as follows: step-by-step bending loading is carried out on the newly designed reinforced concrete combination test section 230, and the stress sigma 'of the upper edge of the top plate 231 in the new structure is tested' On the upper part And stress σ 'of lower edge of test base plate 234' Lower part The change process of the structure from the elastic state to the edge yield state (namely local damage) can be summarized, and meanwhile, the connection performance of the welding nail and the concrete at the connection part of the structure and the test top plate 231 (or the test bottom plate 234) under the condition of local damage can be obtained.
In some embodiments, referring to fig. 4, the test part of the steel-concrete bonded test section 230 connected to the test top plate 231 or the test bottom plate 234 includes a test partition 235 corresponding to the position of the partition 135 in the original structure 100, the test partition 235 is disposed in the upper test cell 230a and/or the lower test cell 230b, and the test partition 235 has a thickness corresponding to the thickness of the partition 135 at the corresponding position in the original structure 100. The thickness of the test partition plate 235 connected with the test top plate 231 or the test bottom plate 234 in the newly designed test model is consistent with that of the partition plate 135 in the original structure 100, so that the structural dimensions of the newly designed test model 200 of the hybrid beam structure and the original structure 100 at the most unfavorable stress positions (upper edge and lower edge) are the same, and the effect of truly simulating the upper edge and the lower edge of the steel-concrete combined section 130 is achieved.
With continued reference to fig. 4, in some embodiments, the steel-concrete combination test section 230 further includes an outer test stud 237 connected to the test top plate 231 or the test bottom plate 234, the outer test stud 237 is disposed in the upper test cell 230a or the lower test cell 230b, and the outer test stud 237 has the same size and arrangement pitch as the outer test stud 137 at the corresponding position in the original structure 100. The outer test welding nails 237 connected with the test top plate 231 or the test bottom plate 234 in the newly designed test model are the same as the outer welding nails 137 at the corresponding positions in the original structure 100 in specification size and arrangement spacing, so that the structural sizes of the newly designed mixed beam structure test model 200 and the original structure 100 at the positions (upper and lower edges) with the most unfavorable stress can be kept the same, and the effect of truly simulating the upper and lower edge parts of the steel-concrete combined section 130 is achieved. Because the sizes of the corresponding parts in the test top plate 231 and the test bottom plate 234 of the steel-concrete combined test section 230 are consistent with those of the corresponding parts in the original structure, the thicknesses of the test parts connected with the test top plate 231 and the test bottom plate 234 are consistent with those of the parts at the corresponding positions in the original structure 100, and the concrete materials used in the test model and the original structure 100 are also consistent, the structural size and the materials of the newly designed test structure and the original structure at the most adverse stress position are the same, scaling of welding nails in equal proportion is not required to be considered at the moment, and the stress state of the weakest stress part of the steel-concrete combined section in the original structure can be truly reflected by adopting the welding nails in normal sizes.
In some embodiments, the test part of the steel-concrete combination test section 230 connected to the test top plate 231 and the test bottom plate 234 includes a test end plate 236 corresponding to the end plate 136 of the original structure 100, the test end plate 236 is disposed at the end of the steel-concrete combination test section 230 in the length direction, and the test end plate 236 has the same thickness as the end plate 136 at the corresponding position of the original structure. In the newly designed structure, the thickness of the test end plate 236 connected with the test top plate 231 and the test bottom plate 234 is consistent with the thickness of the end plate 136 in the original structure 100, so that the structure of the newly designed hybrid beam structure test model 200 at the position (upper edge and lower edge) with the worst stress can be consistent with the original structure 100, the effect of truly simulating the upper edge and the lower edge of the steel-concrete joint section 130 is achieved, and the stress state at the corresponding position of the original structure can be truly reflected during the test.
In some embodiments, referring to fig. 1, a concrete beam section 110, the steel-concrete combination section 130, and the steel beam section 150 are sequentially connected to one another in a longitudinal direction of an original structure 100, and at this time, the hybrid beam structure test model 200 further includes a concrete beam test section 210 and a steel beam test section 250 as shown in fig. 3, where the concrete beam test section 210, the steel-concrete combination test section 230, and the steel beam test section 250 respectively correspond to positions of the concrete beam section 110, the steel-concrete combination section 130, and the steel beam section 150 in the original structure 100 and are sequentially connected to one another. By implementing the embodiment, the method provided by the invention can be applied to bridge structures containing the most basic structures, so that the application range of the method is expanded.
In some embodiments, with continued reference to fig. 1, the original structure 100 further includes a concrete beam transition section 120 and a steel beam transition section 140 in the longitudinal direction, the concrete beam transition section 120 is disposed between the concrete beam section 110 and the steel-concrete joint section 130, and the steel beam transition section 140 is disposed between the steel-concrete joint section 130 and the steel beam section 150. At this time, the hybrid beam structure test model 200 further includes a concrete beam transition test section 220 and a steel beam transition test section 240 as shown in fig. 3, and the positions of the concrete beam transition test section 220 and the concrete beam transition section 120 in the original structure 100 are correspondingly arranged between the concrete beam test section 210 and the steel-concrete combination test section 230; the steel beam transition test section 240 and the steel beam transition section 140 in the original structure 100 are disposed between the steel-concrete combination test section 230 and the steel beam test section 250 in a corresponding manner. The test model 200 of the hybrid beam structure thus includes five parts in the longitudinal bridge direction: the concrete beam test section 210, the concrete beam transition test section 220, the steel-concrete combination test section 230, the steel beam transition test section 240 and the steel beam test section 250, wherein the length of the steel-concrete combination test section 230 is the same as that of the steel-concrete combination section 130 in the original structure 100, and the application range of the method is further expanded.
In some embodiments, referring to fig. 2, the lower surface of the upper cell 130a of the original structure 100 is provided with an upper cell middle plate 132, and in this case, the lower surface of the upper test cell 230a in fig. 4 is provided with an upper cell test middle plate 232 corresponding to the position of the upper cell middle plate 132 of the original structure 100, and the thickness of the upper cell test middle plate 232 is smaller than that of the upper cell middle plate 132. In this embodiment, the upper grid test middle plate 232 is not connected to the test top plate 231 and the test bottom plate 234, so that there is no risk of damage in the test, and the upper grid test middle plate belongs to a secondary part member, and the accuracy of the test is not affected by local free adjustment of the size of the upper grid test middle plate, and the upper grid test middle plate 232 is free and convenient to implement, and has a small thickness, so that the test cost is saved. In other embodiments, the thickness of the upper cell test middle plate 232 may be equal to the thickness of the upper cell middle plate 132, which is not limited herein.
In some embodiments, referring to fig. 2, the upper surface of the lower cell 130b of the original structure 100 is provided with a lower cell middle plate 133, and at this time, the upper surface of the lower test cell 230b of fig. 4 is provided with a lower cell test middle plate 233 corresponding to the position of the lower cell middle plate 133 of the original structure 100, and the thickness of the lower cell test middle plate 233 is smaller than that of the lower cell middle plate 133. In this embodiment, the lower cell test middle plate 233 is not connected to the test top plate 231 and the test bottom plate 234, so that there is no risk of damage during the test, and the lower cell test middle plate belongs to a secondary part member, and the accuracy of the test is not affected by local free adjustment of the size of the lower cell test middle plate 233. In other embodiments, the thickness of the lower cell test middle plate 233 may be equal to the thickness of the lower cell middle plate 133, which is not limited herein.
In some embodiments, the inner side welding nails 138 are provided on the upper cell middle plate 132 and/or the lower cell middle plate 133, and the inner side testing welding nails 238 are provided on the upper cell testing middle plate 232 and/or the lower cell testing middle plate 233 corresponding to the positions of the inner side welding nails 138 on the original structure 100.
In some embodiments, the gauge of the inboard trial tack 238 is smaller than the gauge of the inboard tack 138 at the corresponding location in the original structure 100. In this embodiment, the inner test studs 238 on the upper cell test middle plate 232 and/or the lower cell test middle plate 233 do not contact with the test top plate 231 and the test bottom plate 234, and there is no risk of damage in the test, and the inner test studs belong to secondary part components, and the size of the inner test studs 238 can be freely reduced without affecting the accuracy of the test, and meanwhile, the inner test studs are more freely and conveniently implemented, and the test cost is saved due to the small size. In other embodiments, the size of the inner trial stud 238 may be equal to the size of the inner stud 138 at the corresponding position in the original structure 100, and is not limited herein.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A design method of a test model for testing bending local damage of a steel-concrete combined section is characterized by comprising the following steps:
calculating the upper edge stress sigma of the top plate of the steel-concrete combined section of the original structure under the action of positive bending moment M On the upper part And lower edge stress σ of the base plate Lower part (ii) a The above-mentioned
Wherein, I 0 Is the cross-sectional moment of inertia, H, of the steel-concrete joint section On the upper part Is the distance of the upper edge from the neutral axis of the cross-section, H Lower part Is the distance of the lower edge from the neutral axis of the cross section;
designing a mixed beam structure test model, wherein the mixed beam structure test model comprises a steel-concrete combined test section in the longitudinal bridge direction, and the length of the steel-concrete combined test section is the same as that of the steel-concrete combined section in the original structure; the steel-concrete combined test section comprises an upper test grid chamber and a lower test grid chamber which are arranged in parallel up and down and correspond to the upper grid chamber and the lower grid chamber in the original structure, the upper surface of the upper test grid chamber is provided with a test top plate corresponding to the top plate of the upper grid chamber, and the lower surface of the lower test grid chamber is provided with a test bottom plate corresponding to the bottom plate of the lower grid chamber; setting the sizes of the test top plate and the test bottom plate to be respectively the same as the sizes of the top plate and the bottom plate in the original structure, wherein the test model of the mixed beam structure is the same as the concrete material in the original structure; the thickness of a test part connected with the test top plate and/or the test bottom plate in the steel-concrete combined test section is consistent with that of a corresponding part in an original structure;
presetting the total cross-sectional height H0' of the test model of the mixed beam structure to be smaller than the total cross-sectional height H0 in the original structure, wherein the clear distance H2' between the upper test cell and the lower test cell is smaller than the clear distance H2 between the upper cell and the lower cell in the original structure, and the height H1' of the upper test cell is smaller than the height H1 of the upper cell; the height H3' of the lower test cell is less than the height H3 of the lower cell;
setting values for the height H1' of the upper test cell, the net distance H2' between the upper and lower test cells and the height H3' of the lower test cell such that the hybrid beam structure test model develops an upper edge stress σ ' of the test top plate under positive bending moment M ' On the upper part And lower edge stress sigma 'of test baseplate' Lower part Is the same as the stress ratio of the upper and lower edges of the original structure, i.e.
Due to said->
Wherein, I' 0 Is the cross section inertia moment, H 'of the steel-concrete combined test section' On the upper part Is the distance H 'from the upper edge of the steel-concrete combination test section to the neutral axis of the cross section' Lower part The distance between the lower edge of the steel-concrete combination test section and the neutral axis of the cross section, i.e. get->
2. The design method of the test model for testing the bending local damage of the steel-concrete combined section according to claim 1, wherein the test part connected with the test top plate or the test bottom plate in the steel-concrete combined test section comprises: and the test partition plates correspond to the partition plates in the original structure, are arranged in the upper test cell chamber and/or the lower test cell chamber, and have the same thickness as the partition plates at the corresponding positions in the original structure.
3. The design method of the test model for testing the local flexural failure of the steel-concrete combined section according to claim 1, wherein the steel-concrete combined test section further comprises outer test welding nails connected with the test top plate or the test bottom plate, the outer test welding nails are arranged in the upper test cell chamber or the lower test cell chamber, and the outer test welding nails have the same specification size and arrangement spacing as the outer welding nails at corresponding positions in the original structure.
4. The design method of the test model for testing the bending local damage of the steel-concrete combination section according to claim 1, wherein the test part connected with the test top plate and the test bottom plate in the steel-concrete combination test section comprises: with the corresponding experimental end plate of end plate in the primary structure, experimental end plate is located the tip of steel-concrete combination test segment length direction, just experimental end plate with the end plate thickness of corresponding position department in the primary structure is unanimous.
5. The design method of the test model for testing the local flexural failure of the steel-concrete combined section according to claim 1, wherein the mixed beam structure test model further comprises a concrete beam test section and a steel beam test section, and the concrete beam test section, the steel-concrete combined test section and the steel beam test section respectively correspond to and are sequentially connected with the concrete beam section, the steel-concrete combined section and the steel beam section which are arranged in the longitudinal bridge direction in the original structure.
6. The design method for testing the local flexural failure of the steel-concrete joint section according to claim 5, wherein the test model of the hybrid beam structure further comprises: the concrete beam transition test section and the steel beam transition test section are arranged between the concrete beam test section and the steel-concrete combination test section in a corresponding mode; the steel beam transition test section and the steel beam transition section in the original structure are correspondingly arranged between the steel-concrete combination test section and the steel beam test section.
7. The design method of the test model for testing the local flexural failure of the steel-concrete combination section as claimed in claim 1, wherein the lower surface of the upper test cell is provided with an upper cell test middle plate corresponding to the position of the upper cell middle plate of the original structure, and the thickness of the upper cell test middle plate is smaller than that of the upper cell middle plate.
8. The design method of the test model for testing the local flexural failure of the steel-concrete combination section according to claim 7, wherein the upper surface of the lower test cell is provided with a lower cell test middle plate corresponding to the position of the lower cell middle plate of the original structure, and the thickness of the lower cell test middle plate is smaller than that of the lower cell middle plate.
9. The method as claimed in claim 8, wherein the upper and/or lower grid test midplanes have inner test studs corresponding to the positions of the inner studs on the upper and/or lower grid midplanes of the original structure.
10. The design method for the test model used for testing the bending local damage of the steel-concrete combined section according to claim 9, wherein the specification size of the inner test welding nail is equal to or smaller than the specification size of the inner welding nail at the corresponding position in the original structure.
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