CN117787064A - Effective width analysis system for hogging moment of steel-concrete composite beam bridge - Google Patents
Effective width analysis system for hogging moment of steel-concrete composite beam bridge Download PDFInfo
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- 238000012545 processing Methods 0.000 claims abstract description 37
- 238000005452 bending Methods 0.000 claims description 15
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- 230000008569 process Effects 0.000 abstract description 5
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- 238000000691 measurement method Methods 0.000 abstract description 2
- 238000011179 visual inspection Methods 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 description 13
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Abstract
The invention provides an effective width analysis system of a hogging moment of a steel-concrete composite beam bridge, which relates to the field of effective width analysis and comprises the following components: a steel beam is arranged in the middle of the bottom of the concrete slab; the steel beam bottom is provided with the corresponding verticality detection module, the verticality of the steel beam and the ground can be detected through the data processing module and the data receiving and transmitting module arranged outside the data processing module, the verticality of the steel beam is detected through the verticality detection module, monitoring data are transmitted to the data processing module, the data processing module can generate the monitoring data through the data receiving and transmitting module, the calibration work of the steel beam is assisted, whether the supported steel beam inclines in the analysis process or not is solved, the common measurement method of a tester is visual inspection or the supporting position of the steel beam is detected through the longitude and latitude detector, but the method can generate larger errors, and the problem of effective width test is affected.
Description
Technical Field
The invention relates to the technical field of effective width analysis, in particular to an effective width analysis system for a hogging moment of a steel-concrete composite beam bridge.
Background
In order to consider the shear hysteresis effect of steel-concrete composite beams, the concept of effective flange width was proposed and introduced into elementary beam theory. However, the effective width of the composite beam under the positive bending moment elastic stress state is studied at present, the effective width of the composite beam under the normal use stage is not very clear, a simplified formula of the effective flange width of the negative bending moment area is provided during the normal use stage of the composite beam, the steel bar stress and the concrete crack width in a concrete slab are calculated according to the simplified formula, the accuracy and the applicability of the provided model are verified through test data of the positive bending moment and the negative bending moment loading of the composite beam and comparison of the calculation result of a fine finite element method, a method for determining the effective width of the composite beam based on the steel bar stress in the negative bending moment area is provided, and a simplified calculation formula of the effective width of the composite beam negative bending moment area about uniform distribution loading and concentrated loading in a span is provided through numerical fitting. Finally, a simplified calculation method of the steel bar stress of the hogging moment area of the combined beam in the normal use stage is established based on the proposed effective width simplified formula, and compared with a standard calculation result, the result shows that the standard proposal method can greatly underestimate the contribution of concrete in the hogging moment area to the whole stress, the steel bar stress and the corresponding crack width calculation result are obviously overestimated, however, when the effective width is analyzed, whether the supported steel beam tilts or not occurs in the analysis process, the common measurement method of test personnel is visual inspection or detection of the supporting position of the steel beam through a longitude and latitude detector, but the method can have larger error and influence the performance of the effective width test.
Disclosure of Invention
The embodiment of the disclosure relates to an effective width analysis system of a hogging moment of a steel-concrete composite beam bridge, wherein a corresponding perpendicularity detection module is arranged at the bottom of a steel beam, perpendicularity of the steel beam and the ground can be detected through a data processing module and a data receiving and transmitting module arranged outside the data processing module, perpendicularity of the steel beam is detected through the perpendicularity detection module, monitoring data are transmitted to the data processing module, and the data processing module can generate the monitoring data through the data receiving and transmitting module to assist in calibration work of the steel beam, so that the calibration work of the auxiliary steel beam can be completed quickly, and analysis efficiency is improved.
In a first aspect of the present disclosure, there is provided an objective and efficacy of an effective width analysis system for a negative bending moment of a steel-concrete composite beam bridge, specifically comprising: the concrete slab is in a rectangular plate structure design; the thickness of the concrete slab is eight thick settings of 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm and 120 mm; the net span of the concrete slab is 2500mm; the width of the concrete slab is respectively ten widths of 250mm, 500mm, 750mm, 1000mm, 1250mm, 1500mm, 1750mm, 2000mm, 2250mm and 2500mm, namely the width-span ratio is 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0, other parameters are unchanged, and the effective flange width of the concrete slab is calculated by adopting the method of section 1. Taking the width-span ratio as an abscissa, and enabling the maximum longitudinal steel bar stress in the midspan section concrete slab to reach 50% yield stress; the width-span ratio has very important influence on the width of the effective flange of the concrete slab, and the effective width is reduced along with the increase of the width-span ratio; a steel beam is arranged in the middle of the bottom of the concrete slab; the concrete slab further comprises: the steel bars are pre-buried and arranged in the concrete slab; the steel bars are longitudinally designed; according to engineering experience, the longitudinal steel bars generally account for 1.5% -2% of the section of the concrete slab, the width of the concrete slab is 500mm, the clear span length is 2500mm, and the width-to-span ratio is 0.2; for the calculation of the effective width of the hogging moment area, the tensile effect of the concrete is not considered in the current specification, and the assumption is applicable only when the bearing capacity of the hogging moment area reaches the limit state; under the action of two loads, the effective flange width is reduced by more than eighty percent when the width ratio is 1.0 and the width ratio is 0.1. Meanwhile, as the width-to-span ratio increases, the decreasing trend of the width coefficient of the effective flange gradually becomes gradually slow, and finally the coefficient tends to be constant; according to engineering experience, the longitudinal steel bars generally account for 1.5% -2% of the section of the concrete slab, the width of the concrete slab is 500mm, the clear span length is 2500mm, and the width-to-span ratio is 0.2; for the calculation of the effective width of the hogging moment zone, the current specifications do not take into account the tensile effect of the concrete, and such an assumption is only applicable when the bearing capacity of the hogging moment zone reaches a limit state.
The width coefficients of the effective flanges under the uniformly distributed load are larger than those under the concentrated load, and the width change trend of the effective flanges is consistent. Under the action of concentrated load, the distribution of tangential stress can have serious influence on the distribution of positive stress because of the stress concentration phenomenon, so that the effective flange width coefficient can be suddenly reduced in a certain range; and under uniform load, the effect is relatively small. Therefore, the load type is another important factor influencing the effective width of the concrete flange plate under the action of the hogging moment, and a calculation method of the effective flange width coefficient of the concrete plate is required to be designed according to the load type.
An algorithm for establishing the effective flange width of the hogging moment area by taking the steel bar stress as a reference is provided. Based on the established finite element model, analysis and discussion are respectively made on the influence of factors such as the width ratio, the concrete slab thickness, the longitudinal steel bar reinforcement ratio, the steel beam web height, the concrete strength grade and the like on the effective flange width of the hogging moment area in the normal use stage of the composite beam, and a simplified calculation formula taking the width ratio as a dependent variable is provided
As a still further scheme of the invention, the steel beams are arranged in two groups, wherein one group of steel beams is connected with the bottom of the concrete slab; the girder steel still includes: the peg is installed at the bottom of the steel beam connected with the bottom of the concrete slab; the peg is fixedly connected with the concrete slab.
As still further aspects of the present invention, the steel beam further includes: the mount pad, the mount pad sets up to square seat structure, and the mount pad sets up to four groups, and the mount pad is the installation of symmetry form and sets up in girder steel bottom.
As still further aspects of the present invention, the steel beam further includes: the perpendicularity detection modules are arranged on one sides of the two groups of installation seats, which are adjacent to each other, and the perpendicularity detection modules are designed in a perpendicular mode.
As still further aspects of the present invention, the steel beam further includes: the steel beam web plate is integrally arranged between two groups of steel beams, the steel beams and the steel beam web plate are in vertical design, and the steel beams and the steel beam web plate form an I-shaped structure; the steel beam and the steel beam web form a supporting mechanism together.
As still further aspects of the present invention, the steel beam further includes: the stress detection modules are symmetrically designed, and the spacing between the stress detection modules and the edge of the steel beam is consistent; the stress detection module forms a stress detection mechanism.
As still further aspects of the present invention, the steel beam further includes: the data processing module is arranged on one side of the web plate of the steel beam; the rear end of the data processing module is provided with a power line, and the power line of the data processing module is connected with an external power supply; the data processing module is communicated with the stress detection module and the verticality detection module through electric wires.
As still further aspects of the present invention, the steel beam further includes: the data receiving and transmitting module is arranged on one side of the data processing module; the data processing module is communicated with the data receiving and transmitting module through wire connection.
The effective width analysis system of the hogging moment of the steel-concrete composite beam bridge provided by the invention has the following steps
The beneficial effects are that:
1. the steel beam bottom is provided with the corresponding verticality detection module, the data processing module and the data receiving and transmitting module arranged outside the data processing module are used for detecting the verticality of the steel beam and the ground, the verticality detection module is used for detecting the verticality of the steel beam, monitoring data are transmitted to the data processing module, the data processing module can generate the monitoring data through the data receiving and transmitting module, the calibration work of the steel beam is assisted, the calibration work of the auxiliary steel beam can be completed quickly, the inclination caused by the supporting angle of the steel beam is reduced, the analysis data are deviated, and the analysis efficiency and the analysis precision are improved well.
2. Corresponding stress detection modules are arranged at positions on two sides of the steel beam, stress on two sides of the steel beam is detected through the stress detection modules in the effective width analysis process, data detected by the stress detection modules are matched with the data receiving and transmitting modules through the data processing modules, and the data can be well matched when factors such as the width-to-span ratio, the thickness of the concrete slab, the longitudinal reinforcing steel bar reinforcing rate, the web height of the steel beam, the strength grade of the concrete and the like are changed, so that the analysis precision can be well improved.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
The drawings described below are only for illustration of some embodiments of the invention and are not intended to limit the invention.
In the drawings:
fig. 1 is a schematic view of a structure for supporting concentrated loads in a midspan in accordance with an embodiment of the invention.
Fig. 2 is a schematic diagram of a uniformly distributed load support structure according to an embodiment of the present invention.
Fig. 3 is a schematic view of a concrete slab structure according to an embodiment of the invention.
Fig. 4 is a schematic view of the overall shaft-side three-dimensional structure of an embodiment of the present invention.
Fig. 5 is a schematic view of a steel beam structure according to an embodiment of the present invention.
Fig. 6 is a system configuration diagram of an embodiment of the present invention.
List of reference numerals
1. A concrete slab; 101. reinforcing steel bars; 2. a steel beam; 201. a peg; 202. a mounting base; 203. the perpendicularity detection module; 204. a steel beam web; 205. a stress detection module; 206. a data processing module; 207. and the data receiving and transmitting module.
Detailed Description
In order to make the objects, aspects and advantages of the technical solution of the present invention more clear, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiment of the present invention.
As shown in fig. 1 to 6:
embodiment one: the invention provides an effective width analysis system of a hogging moment of a steel-concrete composite beam bridge, which comprises the following components: the concrete slab 1, the concrete slab 1 is in a rectangular plate structure design; a steel beam 2 is arranged in the middle of the bottom of the concrete slab 1; the concrete slab 1 further comprises: the steel bar 101 is arranged in the concrete slab 1 in a pre-buried mode; the reinforcing bars 101 are of a longitudinal design.
Wherein, the steel beams 2 are arranged in two groups, and one group of steel beams 2 is connected with the bottom of the concrete slab 1; the steel beam 2 further comprises: the peg 201 is installed at the bottom of the steel beam 2 connected with the bottom of the concrete slab 1; the peg 201 is fixedly connected with the concrete slab 1.
Specific use and action of the embodiment: based on practical engineering experience, the stress of the steel bar 101 generally does not exceed 50% yield stress in the normal use stage; but may be less than 30% yield stress and the resulting effective flange width is greater when the bar 101 is less stressed. For safety reasons, the stage of the stress of the longitudinal steel bar 101 at 30% -50% of the yield stress is selected as the determination basis of the normal use stage of the hogging moment.
The size of the effective flange width of the midspan section is calculated when the stress of the longitudinal steel bar 101 reaches 20%, 30%, 40% and 50% of yield stress stages, and two loading modes of uniform load and midspan concentrated load are adopted, and according to the accompanying drawings 1 and 2, the effective flange width of the midspan section is analyzed from the aspects of the width-span ratio, the thickness of the concrete slab 1, the reinforcement ratio of the longitudinal steel bar 101, the height of the steel beam web 204, the strength grade of concrete and the like in each stage, and no relative slippage between the concrete top plate and the steel beam 2 is assumed in the analysis process.
The width of the concrete slab 1 is respectively ten widths of 250mm, 500mm, 750mm, 1000mm, 1250mm, 1500mm, 1750mm, 2000mm, 2250mm and 2500mm, namely the width-span ratio is 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0, other parameters are unchanged, and the effective flange width of the concrete slab 1 is calculated by adopting the method of the section 1. Taking the width-to-span ratio as an abscissa, and enabling the stress of the maximum longitudinal steel bar 101 in the midspan section concrete slab 1 to reach 50% yield stress; the width-to-width ratio has a very important effect on the effective flange width of the concrete slab 1, and the effective width decreases as the width-to-width ratio increases.
Under the action of two loads, the effective flange width is reduced by more than eighty percent when the width ratio is 1.0 and the width ratio is 0.1. Meanwhile, as the width-to-span ratio increases, the decreasing trend of the width coefficient of the effective flange gradually becomes gradually slow, and finally the coefficient tends to be constant; according to engineering experience, the longitudinal steel bar 101 generally accounts for 1.5% -2% of the section of the concrete slab 1, the width of the concrete slab 1 is 500mm, the clear span length is 2500mm, and the width-span ratio is 0.2; for the calculation of the effective width of the hogging moment zone, the current specifications do not take into account the tensile effect of the concrete, and such an assumption is only applicable when the bearing capacity of the hogging moment zone reaches a limit state.
The width coefficients of the effective flanges under the uniformly distributed load are larger than those under the concentrated load, and the width change trend of the effective flanges is consistent. Under the action of concentrated load, the distribution of tangential stress can have serious influence on the distribution of positive stress because of the stress concentration phenomenon, so that the effective flange width coefficient can be suddenly reduced in a certain range; and under uniform load, the effect is relatively small. It can be derived from this that the load type is another important factor affecting the effective width of the concrete flange plate under the action of the hogging moment, so the calculation method of the effective flange width coefficient of the concrete slab 1 needs to be designed according to the load type.
In a second embodiment, based on the first embodiment, as shown in fig. 2 to fig. 4; the effective width analysis system of the hogging moment of the steel-concrete composite beam bridge comprises: the steel beam 2 further comprises: the steel beam webs 204 are integrally arranged between two groups of steel beams 2, the steel beams 2 and the steel beam webs 204 are vertically designed, and the steel beams 2 and the steel beam webs 204 form an I-shaped structure; the steel beam 2 and the steel beam web 204 together form a supporting mechanism.
The working principle of the embodiment is as follows: eight thicknesses of 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm and 120mm of the concrete slab 1 are selected respectively. The reinforcement ratio of the longitudinal steel bar 101 is constant at 2%, but the positions and the thicknesses of the layers of the steel bar 101 are changed along with the thickness change of the concrete slab 1, the rest parameters are unchanged, 10 reinforcement ratios of which the area of the longitudinal steel bar 101 is 0.5%, 0.75%, 1.0%, 1.25%, 1.5%, 1.75%, 2.0%, 2.25% and 2.5% of the cross section area of the concrete slab 1 are respectively selected, effective flange width calculation is carried out, seven conditions of the heights of the steel beam web 204 are respectively selected, namely 170mm, 220mm, 270mm, 320mm, 370mm, 420mm and 470mm, the effective flange width analysis is carried out while other parameters are kept unchanged, the effective flange width coefficient is reduced to a certain extent along with the gradual increase of the thickness of the concrete slab 1 or the gradual increase of the reinforcement ratio of the longitudinal steel bar 101, but the reduction range is not large, and the effective flange width coefficient is slightly increased along with the increase of the height of the steel beam web 204 or the strength grade of concrete. In combination, the thickness of the concrete slab 1, the reinforcement ratio of the longitudinal steel bars 101, the height of the steel beam webs 204 and the strength grade of the concrete slab 1 have very limited influence on the width coefficient of the effective flange plate, and the fluctuation range of the effective flange plate is almost negligible in engineering.
The algorithm for establishing the effective flange width of the hogging moment area by taking the stress of the steel bar 101 as a reference is given by analyzing the influence on the effective flange width of the thickness of the concrete slab 1, the reinforcement arrangement rate of the longitudinal steel bar 101, the height of the steel beam web 204 and the strength grade of the concrete slab 1. Based on the established finite element model, the influence of factors such as the width-span ratio, the thickness of the concrete slab 1, the reinforcement ratio of the longitudinal steel bars 101, the height of the steel girder web 204, the strength grade of the concrete slab 1 and the like on the effective flange width of the hogging moment area in the normal use stage of the composite girder is analyzed and discussed, and a simplified calculation formula taking the width-span ratio as a dependent variable is provided.
Embodiment III, on the basis of embodiment II, as shown in FIG. 5 and FIG. 6; the effective width analysis system of the hogging moment of the steel-concrete composite beam bridge comprises: the steel beam 2 further comprises: the installation seats 202 are of square seat structures, the installation seats 202 are four groups, and the installation seats 202 are symmetrically arranged at the bottom of the steel beam 2; the perpendicularity detection modules 203 are arranged on one side, adjacent to the two groups of mounting seats 202, of the perpendicularity detection modules 203, and the perpendicularity detection modules 203 are all in a perpendicular design; the stress detection modules 205 are arranged in four groups, the stress detection modules 205 are symmetrically designed, and the spacing between the stress detection modules 205 and the edge of the steel beam 2 is consistent; the stress detection module 205 constitutes a stress detection mechanism; the data processing module 206, the data processing module 206 is installed on one side of the steel beam web 204; the rear end of the data processing module 206 is provided with a power line, and the power line of the data processing module 206 is connected with an external power supply; the data processing module 206 is communicated with the stress detection module 205 and the verticality detection module 203 through electric wire connection; the data receiving and transmitting module 207, the data receiving and transmitting module 207 is installed on one side of the data processing module 206; the data processing module 206 is connected to the data transceiver module 207 by a wire.
The working principle of the embodiment is as follows: when the steel beam 2 is fixed to the bottom of the concrete slab 1, the steel beam 2 is properly detected through the perpendicularity detection module 203, the perpendicularity detection module 203 can detect the supporting perpendicularity of the steel beam 2, monitoring data are transmitted to the data processing module 206, then the data processing module 206 processes the data detected by the perpendicularity detection module 203, the data processing module 206 sends data through the data receiving and transmitting module 207, an analyst can detect the installation perpendicularity of the steel beam 2, and the stress detection module 205 can detect the longitudinal stress of the concrete slab 1.
The foregoing is merely exemplary embodiments of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims.
Claims (8)
1. An effective width analysis system of a negative bending moment of a steel-concrete composite beam bridge, comprising: the concrete slab (1), the said concrete slab (1) takes the form of the rectangular plate structure design; the concrete slab is characterized in that a steel beam (2) is arranged in the middle of the bottom of the concrete slab (1); the concrete slab (1) further comprises: the steel bar (101), the steel bar (101) is pre-buried and arranged in the concrete slab (1); the steel bar (101) is of a longitudinal design.
2. An effective width analysis system of negative bending moment of steel-concrete composite girder bridge according to claim 1, wherein: the steel beams (2) are arranged in two groups, wherein one group of steel beams (2) is connected with the bottom of the concrete slab (1); the steel beam (2) further comprises: the bolt (201) is arranged at the bottom of the steel beam (2) connected with the bottom of the concrete slab (1); the peg (201) is fixedly connected with the concrete slab (1).
3. An effective width analysis system of negative bending moment of steel-concrete composite girder bridge according to claim 2, wherein: the steel beam (2) further comprises: the mounting seats (202), the mounting seats (202) are of square seat structures, the mounting seats (202) are arranged into four groups, and the mounting seats (202) are symmetrically arranged at the bottom of the steel beam (2).
4. An effective width analysis system of negative bending moment of steel-concrete composite girder bridge according to claim 3, wherein: the steel beam (2) further comprises: the perpendicularity detection modules (203), the perpendicularity detection modules (203) are arranged on one sides of the two groups of installation seats (202) adjacent to each other, and the perpendicularity detection modules (203) are all of a perpendicular design.
5. An effective width analysis system for a negative bending moment of a steel-concrete composite girder bridge according to claim 4, wherein: the steel beam (2) further comprises: the steel beam webs (204) are integrally arranged between two groups of steel beams (2), the steel beams (2) and the steel beam webs (204) are vertically designed, and the steel beams (2) and the steel beam webs (204) form an I-shaped structure; the steel beam (2) and the steel beam web (204) form a supporting mechanism together.
6. An effective width analysis system for a negative bending moment of a steel-concrete composite girder bridge according to claim 5, wherein: the steel beam (2) further comprises: the device comprises stress detection modules (205), wherein a connecting plate is arranged on one side of the stress detection modules (205), the stress detection modules (205) are fixed with a steel beam (2) through fixing screws penetrating through the connecting plate of the stress detection modules (2) (05), the stress detection modules (205) are arranged into four groups, the stress detection modules (205) are symmetrically designed, and the intervals between the stress detection modules (205) and the edge of the steel beam (2) are consistent; the stress detection module (205) forms a stress detection mechanism.
7. An effective width analysis system for a negative bending moment of a steel-concrete composite girder bridge according to claim 6, wherein: the steel beam (2) further comprises: the data processing module (206), the data processing module (206) is installed and arranged on one side of the steel beam web 2 (04); the rear end of the data processing module (206) is provided with a power line, and the power line of the data processing module (206) is connected with an external power supply; the data processing module (206) is communicated with the stress detection module (205) and the verticality detection module (203) through electric wire connection.
8. An effective width analysis system for a negative bending moment of a steel-concrete composite girder bridge according to claim 7, wherein: the steel beam (2) further comprises: a data transmitting/receiving module (207), wherein the data transmitting/receiving module (207) is installed on one side of the data processing module (206); the data processing module (206) is communicated with the data transmitting and receiving module (207) through wire connection.
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| Title |
|---|
| 朱力: "钢混组合桥梁结构的计算模型及设计方法", 31 July 2021, 中国铁道出版社, pages: 169 - 178 * |
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