CN110987504B - Device and method for testing temperature gradient and influence of steel structure under light radiation - Google Patents
Device and method for testing temperature gradient and influence of steel structure under light radiation Download PDFInfo
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Abstract
The invention discloses a testing device and a matched testing method for the temperature gradient and the influence of a steel structure under optical radiation. The components of the testing device comprise a cross beam, an upright post, a support, an accessory lug plate, a control test piece support and the like, and all the components are connected through common bolts in an assembled mode. The standard temperature gradient actual measurement of the steel member with any section form or the common large-span steel structure model is realized in the same device, the rigid connection, the hinge connection or the unconstrained free switching of the member support can be realized, the free switching of different forms, different numbers and different lengths can be realized, the test device does not need to provide a counterforce facility externally, and the test device can be disassembled for cyclic utilization after the experiment; the matched testing method covers two parts of temperature gradient actual measurement and influence testing on internal force and deformation of the component, the data monitoring method is reliable, collected data is stable and comprehensive, and particularly the problem that the gradient temperature effect of the traditional large-span steel structure is difficult to quantitatively evaluate is solved.
Description
Technical Field
The invention relates to the technical field of steel structures, in particular to a testing device and a testing method for steel structure temperature gradient and influence thereof under light radiation.
Technical Field
Any building material changes along with the change of the surrounding thermal environment conditions, namely, the physical phenomena of thermal expansion and cold contraction exist. The building is in natural environment and is subjected to the change of spring, summer, autumn and winter all the year round. The temperature effects due to natural environmental conditions are largely divided into two categories: uniform temperature load and gradient temperature load. The uniform temperature load mainly refers to seasonal temperature effect, and is slow, uniform and integral temperature effect which is presented by four seasons alternation, so that the integral thermal deformation generated by the structure is relatively simple; the gradient temperature load is mainly caused by external natural light radiation and mainly comprises direct solar radiation, atmospheric scattering radiation, sky ground environment radiation and the like, natural light radiation is continuously changed due to east and west falling of the sun within a day and night, and the gradient temperature load of the structure is caused by shielding of the structure and the surrounding environment, and is characterized by short-time rapid change, uneven distribution, structure temperature being far higher than air temperature and the like, so that uneven thermal deformation of the structure is caused, local stress is partial and is most complex.
In recent decades, with the vigorous development of economic construction, the construction industry of China develops rapidly, and the requirements of large-space buildings are very vigorous. With the upsizing of the horizontal dimension such as 'large space', in the space structure engineering of construction period, having large outdoor components and adopting large-area glass daylighting roof or light-transmitting film roof, the temperature load becomes serious in various loads of the structure and becomes non-negligible, and even becomes a control factor of structural design and construction. The concrete steps are as follows: the large-span steel structure has large geometric dimension, numerous rod pieces, complex structural form, high-order hyperstatic, redundant constraint prevents temperature deformation of the structure, generated temperature secondary stress can occupy a considerable proportion of material strength in certain cases, so that working condition combinations involving temperature action can sometimes become control combinations, meanwhile, node displacement generated in the structure by temperature action is very considerable, construction errors caused by temperature deformation seriously affect assembly efficiency of components and folding and forming of the structure, the temperature stress can be generated in the structure after folding if the temperature stress cannot be fully released, the actual structural stress state and the design state have great difference, and negative hidden danger is brought to the safety of the structure. In the conventional structural design, the temperature load is applied in an overall uniform heating or cooling mode according to the temperature change, only the influence of the uniform temperature load can be considered, the most adverse condition of the gradient temperature load cannot be covered, and the local stress of part of the components is larger and the design requirement is not met. Under solar radiation in summer, the surface temperature of the steel structure is higher than the ambient temperature by more than 25 ℃, the gradient temperature difference is about 20 ℃, and the temperature change during day and night can reach more than 35 ℃. Therefore, the temperature load, especially the gradient temperature load, is not neglected in the design and construction of the large-span steel structure.
The steel structure gradient temperature load research has stronger complexity, is influenced by a plurality of factors such as light radiation conditions, ambient temperature, wind speed conditions, ground reflection conditions, shadow shielding and the like, only puts forward the principle requirement in the current specification, and lacks clear design rules and calculation methods. At present, the research on the gradient temperature load of the steel structure is less, particularly the experimental research is more lacking, the monitoring of the temperature gradient lacks a unified measurement standard, and a stable and reliable measurement device and a method are not available. Most of the existing research methods based on numerical simulation analyze the distribution situation of a temperature field or research the temperature effect of a steel structure by using the assumed temperature field distribution, and reliable experimental verification is also required for research conclusion. Therefore, it is necessary to establish a gradient temperature effect testing device and a reliable testing method which can be operated normally, adapt to various steel structural members and structural models, and are easy to realize. The distribution rule of gradient temperature load and the influence on structural performance are summarized by carrying out a large number of long-term experimental monitoring on steel structural members, structural models and the like which are commonly used in steel structures, so that the blank in the aspect of gradient temperature action regulation in the steel structural design and construction specifications in China is filled, and important references are provided for the design and construction of practical large-span steel structural engineering.
Disclosure of Invention
The invention aims to provide a testing device for the temperature gradient and the influence of the temperature gradient of a steel structure under light radiation, and also provides a testing method of a system, so as to solve the problems that the temperature gradient experiment of a steel structure member and a structural model is standardized and the temperature effect of the gradient is difficult to measure.
In order to solve the problems, the invention provides a testing device for the temperature gradient of a steel structure under light radiation and the influence of the temperature gradient, wherein device components comprise a cross beam, a stand column, a support, an accessory lug plate and a control test piece bracket, and all the components are connected through common bolts in an assembling way; the stand is located on ground concrete mesa, and the stand upper end is equipped with the stand end plate, and the crossbeam passes through bolted connection with the stand end plate, support and affiliated otic placode are used for connecting the test object of different constraint condition demands, and the crossbeam top flange evenly sets up the mounting hole, and convenient test object of different forms, different length, different quantity are connected, and testing arrangement whole surface all adopts white rust-proof paint, and the contrast test piece support passes through the bolt with the inboard floor of crossbeam and links to each other, is used for placing the contrast test piece that the temperature gradient influences the test on it.
The beam is a wide flange I-steel HW400 x 13 x 21mm, the length is 6.0m, the bolt holes are formed in the lower flanges at the two ends, the beam is convenient to connect with the lower upright post, stiffening ribs with the interval of 500mm are arranged along the length direction of the beam, the upper flanges are uniformly provided with 150mm equidistant locating holes, and the adjustment of the installation positions of test objects with different forms, different lengths and different numbers is convenient.
The upright posts at the two sides are wide flange I-steel HW400 multiplied by 13 multiplied by 21mm with the height of 0.5m. The upper end shrouding relevant position is opened the bolt hole, with crossbeam bottom flange bolt, for strengthening testing arrangement's overall stability, and the post bottom shrouding links to each other with ground concrete foundation.
The support is a rigid support formed by welding sealing plates at two ends of 300 mm-length wide flange I-steel HW400 x 13 x 21mm and welding cross rib plates in the middle, the lower flange plate is provided with bolt holes, the lower flange plate is connected with the upper flange of the lower beam through 4 bolts, and one side sealing plate is provided with a reserved bolt hole so as to be convenient to connect with a test object; the fixed support node is designed to be a box-shaped support and is connected with the component end plate through 4 bolts, the hinge support node is provided with an auxiliary lug plate connecting piece between the component end plate and the support, and the auxiliary lug plate connecting piece is connected with the component end plate through a pin, so that the vertical rotation freedom degree of the component is released; in the structural system model experiment, the model support can be directly connected with the upper flange of the beam through bolts.
In order to reduce the influence of light radiation on the testing device, the whole testing device is sprayed with white antirust paint, and can be coated with heat-insulating materials if necessary, so that the temperature effect of the testing device is reduced, the error of temperature effect measurement is reduced, and the reliability of experimental data is improved.
The control test piece support is fixed with a stiffening rib plate on one side of the beam through bolts, and 6 sections of 400 mm-long 140X 140mm equilateral angle steel are uniformly arranged and used for setting the control test pieces with different types, different lengths and different numbers in the gradient temperature effect experiment.
The I-steel, angle steel, steel plate and other raw materials adopted by the testing device are common steel materials, the mechanical cutting and bolt hole opening are common processing technologies, all components of the device can be processed in a factory, and the common bolt assembly forming is adopted on site, so that complex construction technology or large-scale equipment is not required. The test piece or the model can be connected with the platform through adjusting or replacing the support component and the platform through bolts, so that three constraint forms of solid support, hinge support and freedom are realized, and the multi-component or the model is used for carrying out experiments on the same platform, thereby being beneficial to promoting the standardization of the experiments and ensuring the stability of experimental data.
The invention provides a test method for the temperature gradient and the influence of the temperature gradient of a steel structure under light radiation, which comprises two parts of temperature gradient monitoring and gradient temperature effect monitoring. The experiment comprises the following specific steps:
Step one: experiments are carried out under natural light conditions, the test requires that the field is wide, the light radiation is sufficient, the ventilation is good, and the surrounding is free from foreign matter shielding;
Step two: the components of the testing device are processed by a factory and then are transported to the site for installation, a steel member or a structural model is designed and processed according to the size requirement of the testing device, and a proper support component is selected according to the constraint condition of the requirement of the testing purpose and is installed on the testing device;
Step three: for the steel structure temperature gradient test, a plurality of temperature sensors are uniformly arranged along the length and the cross section direction of a test object according to the experimental target and the precision requirement, the surface temperature gradient condition is captured, and the synchronous acquisition of the thermal boundaries such as the light radiation quantity, the air temperature, the air speed and the like is required;
Step four: for testing the influence of temperature gradient on the internal force and deformation of a steel structure, on the basis of the third step, adjusting and installing a support assembly according to the requirement of constraint conditions, uniformly arranging strain measuring points and deformation measuring points in the cross-section direction of a tested object, selecting the same material and specification for a comparison test piece and an experimental model, and placing the same material and specification on a comparison test piece bracket, wherein the heights, angles and measuring point arrangement conditions of the two are the same;
Step five: the digital acquisition of experimental data is realized through a test analysis system, all-weather timing acquisition of data such as temperature, displacement, strain, light radiation quantity, wind speed, wind direction and the like is realized, and the frequency of data sampling is determined according to experimental requirements;
step six: the unconstrained control test piece is used for converting internal force caused by temperature change of an experimental object, and the influence of temperature gradient on the internal force and deformation of the component is measured by adopting indexes such as average temperature stress, bending deformation and the like; the average temperature stress is the average value of the temperature stress results of all measuring points of the same section, and can be calculated by the formula (1); the temperature gradient will cause the constraining member itself to generate a bending stress, which can be calculated by equation (2); the bending deformation is the variation of the deformation measuring point displacement meter.
Wherein σ a —the average temperature stress (Mpa) of the constraining member caused by the temperature gradient;
epsilon i、εi' are strain values of the corresponding i-th measuring points of the test object and the control test piece respectively;
n is the total number of measuring points of the test object or the control test piece;
e-modulus of elasticity (MPa) of the material;
wherein σ b —bending stress of the constraining member caused by the temperature gradient (Mpa);
Epsilon t、εt' are strain values of corresponding measuring points on the top surfaces of the test object and the control test piece respectively;
epsilon b、εb' are strain values of corresponding measuring points on the bottom surfaces of the test object and the control test piece respectively;
s-the distance (mm) between the top surface measuring point of the component and the neutral axis;
h-component height (mm).
Step seven: and (3) finishing test data, analyzing the contents such as temperature gradient rule, time-varying characteristic, influence rule of boundary factors, influence on structural performance and the like of the steel structure under optical radiation, and providing standard experiment basis for researching related theoretical problems.
Compared with the prior art, the invention has the following advantages: the steel structure temperature gradient under the light radiation and the testing device influenced by the steel structure temperature gradient are high in standardization degree, all components are connected by adopting assembly bolts, construction and installation are simple, large-scale equipment is not needed during transportation and hoisting, and the steel structure temperature gradient can be disassembled for recycling after experiments; the testing device has perfect functions, can monitor the temperature gradient, can perform gradient temperature effect experiments in cooperation with different support assemblies, realizes the self-balancing of the gradient temperature effect experiments by utilizing the characteristic of high self-rigidity, and does not need to provide a counterforce facility outside; the testing device has strong adaptability, can test common components such as round pipes, rectangular pipes, I-steel and the like (at most three different steel components can be simultaneously compared and tested), can also test structural system models such as net racks, string beams and other structural models, has simple operation, flexible use and strong practicability, can effectively reduce the temperature action experiment cost and improve the experiment efficiency.
The method for testing the temperature gradient and the effect of the steel structure under the light radiation is simple and easy to implement, comprises two parts of temperature gradient monitoring and gradient temperature effect monitoring, and is reliable in data monitoring method and stable and comprehensive in acquired data. The temperature gradient test method can provide stable and long-term temperature gradient data and corresponding thermal boundary conditions thereof, and provides good experimental basis for large-span steel structure temperature field simulation and parameter value method research; the proposed gradient temperature effect monitoring method fills the blank of the experimental measurement method of the gradient temperature effect of the large-span steel structure, quantitatively measures the influence of the gradient temperature effect on the performance of the component by indexes such as average temperature stress, bending deformation and the like, and provides a good experimental basis for the research of the temperature effect mechanism of the large-span steel structure.
The invention overcomes the defects that the existing steel structure temperature action experiment has no standard experiment device, inconsistent comparison experiment conditions, difficult measurement of temperature effect, incapability of considering gradient temperature effect and the like, realizes free switching of any type of steel member and common structure system model on the same platform, rigid connection, hinging or free and unconstrained free switching of a support, can simultaneously carry out comparison experiments of a plurality of test objects for controlling different variables under the same environment condition, has much higher rigidity than the test objects, and adopts measures for relieving the influence of self temperature effect, thereby ensuring the experiment effect and the data reliability. The matched test method comprises two parts of temperature gradient monitoring and gradient temperature effect influence monitoring, and the change condition of the thermal boundary condition is measured while the temperature gradient of the test piece is changed along with the time, so that the error problem of the environmental thermal boundary condition based on the traditional theoretical value or the empirical value in the past experimental study is solved, and more refined actual measurement verification data is provided for the study of the numerical simulation method; the quantitative measurement index of the gradient temperature effect is provided in the gradient temperature effect test method, the bending stress experiment measurement method based on the comparison test piece with the same environmental condition is provided, and the bending stress and bending deformation caused by the gradient temperature effect under different constraint conditions of the steel member are measured. The test device is standard assembly type, is simple and feasible to process and manufacture, and has strong adaptability of the test piece, low cost and high efficiency; the matched standard test method is simple and feasible, the test data are comprehensive and reliable, the standardization of the temperature effect experimental study of the large-span steel structure is facilitated, and particularly, important experimental support is provided for the theory and the simulation study of the gradient temperature effect.
Drawings
FIG. 1 is an overall isometric view of a test apparatus;
FIG. 2 is an experimental assembly diagram of a hinged steel member;
FIG. 3 is an experimental assembly diagram of a solid support steel member;
FIG. 4 is an experimental assembly diagram of a grid structure model;
fig. 5 is an experimental assembly diagram of a beam string structure model.
Reference numerals are used. 1: beam, 2: stiffening ribs, 3: upright post, 4: box-shaped support, 5: support otic placode, 6: test piece otic placode, 7: control specimen holder, 8: test member, 9: control, 10: grid structure model, 11: and (5) a beam string structural model.
Detailed Description
The embodiments of the present invention are described in detail below with reference to the accompanying drawings, and the present invention is further described. Like reference symbols in the various drawings indicate like elements. The following examples are illustrative and are intended to illustrate the invention and are not to be construed as limiting the invention.
The invention relates to a testing device for steel structure temperature gradient and influence thereof under light radiation, which mainly comprises a cross beam 1, stiffening ribs 2, upright posts 3, a support assembly and a control test piece bracket 7, wherein the support assembly comprises a box-shaped support 4, a support lug plate 5 and a test piece lug plate 6, and is shown in figure 1. The beam 1 is provided with stiffening ribs 2 every 500mm along the length direction, sealing plates are welded at the upper ends of the upright posts 3 and are provided with bolt holes, the lower flange of the beam 1 is bolted with the upper sealing plates of the upright posts 3, the control test piece support 7 is connected with the stiffening ribs on one side of the beam 1 through bolts, and the whole testing device adopts white paint. The upper flange of the beam 1 is provided with equidistant bolt holes of 150mm, so that the beam is convenient to bolt with the box-type support 4. When the test piece is in a hinged condition, the box-shaped support 4 is bolted with the support lug plate 5, the test piece end plate is bolted with the test piece lug plate 6, and the lug plates are connected through pins, as shown in fig. 2; when the test piece is in a solid supporting condition, the test piece ear plate 6 is directly bolted with the box-type support 4, as shown in figure 3; in the structural system model experiment, the model support can be directly connected with the upper flange of the beam through bolts, as shown in fig. 4 and 5.
First embodiment: the test object is a rectangular pipe, an I-steel and a round pipe which are commonly used in a steel structure, and the test object is Q235 steel. The components are divided into 3 groups according to experimental requirements, the first two groups are steel component temperature gradients and effect test components 8 thereof, the 3 rd group is a temperature effect control test piece 9, and detailed information of the test pieces is shown in table 1. The temperature gradient of the first group of hinged test pieces and the effect experiment thereof are shown in fig. 2, and the temperature gradient of the second group of fixed test pieces and the effect experiment thereof are shown in fig. 3. The experiment is strictly carried out according to the steps one to seven of the test method matched with the patent, stable and reliable experimental data are obtained, and the result shows the temperature gradient distribution characteristics of steel components with different section forms, and the influence of environmental factors including light radiation quantity, wind speed, air temperature and the like on the temperature gradient of the components, so that the influence of the temperature gradient of the fixed and hinged test pieces on the internal force and deformation of the fixed and hinged test pieces is mastered.
Table 1 test piece parameters
Specific embodiment II: the test object adopts a common double-layer grid structure system, the grid structure model 10 is designed into a welding ball quadrangular pyramid grid, the overall plane size is 4m side length, the upper chord grid size and the lower chord grid size are 0.8m, the structure thickness is 0.7m, the lower chord ball nodes at the two ends are provided with cross plate supports and are bolted with a cross beam of the test device, the rod piece adopts a round tube with phi 42 multiplied by 3mm, the welding ball is WS120 multiplied by 4mm, and the structural model is installed and formed as shown in figure 4. The experiment is strictly carried out according to the steps one to seven of the matched test method, and the number of the net rack structure model rods is considered, so that one of the rods with the same space angle is selected for monitoring from the perspective of economy and comprehensiveness; for the lower chord member and the web member, the temperature measuring points are arranged by selecting members which are easily shielded by shadows of surrounding members. The net rack model experiment selects 7 rods in total for monitoring, and the net rack model experiment comprises 2 upper chords, 4 web members and 1 lower chord. The control test piece adopts the same round tube, adopts the same measuring point arrangement, and is placed on the control test piece bracket. And a large amount of stable and reliable data are obtained through experiments, and the result shows the temperature gradient distribution rule of the components in each region of the grid structure and the influence of the temperature gradient distribution rule on the internal force and deformation of the structure.
Third embodiment: the test object is a string beam structure with a inhaul cable, the prestress string beam structure model 11 is designed into a one-way stay bar jacking string beam structure, an upper string arch is a wide flange I-steel, the span is 4m, the sagittal ratio is 0.08, a lower string is a steel strand with the diameter of 12mm, and both ends of the anchor are O-shaped pressed steel sleeves. The left end support of the model is bolted with the upper flange of the cross beam of the testing device, the right end support is directly placed on the counter-force beam, the horizontal direction can slide, and the structural model is installed and formed as shown in figure 5. According to the test method matched with the invention, experiments are carried out in the first step to the seventh step, and fine adjustment is properly carried out according to the test requirements. The measuring point positions are arranged according to the characteristics of the structural model, the upper chord arch measuring points are arranged at the midspan position, wherein the upper flange is provided with 2 measuring points, the web is provided with 1 measuring point, the lower flange is provided with 2 measuring points, the left and right stay ropes are respectively provided with 1 measuring point, and the total temperature of the upper chord arch measuring points is 7 temperature measuring points; the displacement measuring points are arranged at the arch crown position of the upper chord arch and the arch foot support seat position capable of sliding freely, and 2 displacement measuring points are arranged in total; and a tension sensor is connected in series on the inhaul cable to monitor the change condition of the cable force. And a large amount of stable and reliable data are obtained through experiments, and the result shows the temperature distribution rule of each member of the beam string structure and the influence of the temperature distribution rule on the effect on the internal force and deformation of the structure.
Finally, it is pointed out that the above examples are intended to illustrate but not limit the technical solution of the invention, and that various modifications and improvements made by those skilled in the art to the technical solution of the invention shall fall within the scope of protection defined by the claims of the invention without departing from the general idea of the invention.
Claims (7)
1. The device comprises a beam, an upright post, a support, an accessory lug plate and a control test piece bracket, wherein the components are connected through bolts in an assembling manner; the method is characterized in that: the stand column is located on a ground concrete table top, the cross beam is connected with an end plate of the stand column at the lower part through bolts, the auxiliary lug plate comprises a support lug plate and a test piece lug plate, the support and the auxiliary lug plate are used for connecting test objects with different constraint condition requirements, the cross beam adopts I-steel, a mounting hole for connecting the test objects is formed in the upper flange of the cross beam, and the control test piece support is connected with an inner side rib plate of the cross beam through bolts and used for placing a control test piece for influencing the test by temperature gradient; the testing method of the device comprises the following steps:
Step one: the experimental conditions are selected, under the natural light with sufficient light radiation, the testing site is wide, ventilation is good, and surrounding foreign matter is not shielded;
Step two: the test device assembly is processed by a factory and then is transported to the site for installation, a steel member or a structural model is designed and processed according to the size requirement of the test device, and a proper support assembly is selected according to the constraint condition of the test purpose requirement and is installed on the test device, wherein the support assembly comprises a support, a support lug plate and a test piece lug plate;
Step three: for steel structure temperature gradient test, uniformly arranging a plurality of temperature sensors along the length and cross section direction of a test object according to the experimental target and the precision requirement, capturing the surface temperature gradient condition of the test object, synchronously collecting the thermal boundaries such as light radiation quantity, air temperature, wind speed and the like, and simultaneously considering the influence of the thermal boundaries, including the light radiation quantity, the air temperature, the wind speed and the wind direction; the unconstrained control test piece is used for converting internal force caused by temperature change of an experimental object, and the influence of temperature gradient on the internal force and deformation of the component is measured by adopting indexes such as average temperature stress, bending deformation and the like; the average temperature stress is the average value of the temperature stress results of all measuring points of the same section, and can be calculated by the formula (1); the temperature gradient will cause the constraining member itself to generate a bending stress, which can be calculated by equation (2); the bending deformation is the variation of the deformation measuring point displacement meter:
Wherein σ a —the average temperature stress (Mpa) of the constraining member caused by the temperature gradient;
epsilon i、εi' are strain values of the corresponding i-th measuring points of the test object and the control test piece respectively;
n is the total number of measuring points of the test object or the control test piece;
e-modulus of elasticity (MPa) of the material;
wherein σ b —bending stress of the constraining member caused by the temperature gradient (Mpa);
Epsilon t、εt' are strain values of corresponding measuring points on the top surfaces of the test object and the control test piece respectively;
epsilon b、εb' are strain values of corresponding measuring points on the bottom surfaces of the test object and the control test piece respectively;
s-the distance (mm) between the top surface measuring point of the component and the neutral axis;
h—member height (mm);
Step four: for testing the influence of temperature gradient on internal force and deformation of a steel structure, on the basis of the third step, adjusting and installing a support assembly according to the requirement of constraint conditions, uniformly arranging stress measuring points and deformation measuring points in the cross-section direction of a test object, selecting the same material and specification for a comparison test piece and an experimental model, and placing the same material and specification on a comparison test piece bracket, wherein the heights, angles and measuring point arrangement conditions of the two are the same;
Step five: the digital acquisition of experimental data is realized through a test analysis system, all-weather timing acquisition of data such as temperature, displacement, strain, light radiation quantity, wind speed, wind direction and the like is realized, and the frequency of data sampling is determined according to experimental requirements;
Step six: the unconstrained control test piece is used for converting internal force caused by temperature change of an experimental object, and the influence of temperature gradient on the internal force and deformation of the component is measured by adopting indexes such as average temperature stress, bending deformation and the like;
Step seven: and (3) finishing test data, and analyzing the temperature gradient rule, the time-varying characteristic, the influence rule of boundary factors and the influence on structural performance of the steel structure under optical radiation.
2. The device for testing the temperature gradient and the influence of the temperature gradient of the steel structure under the light radiation according to claim 1, wherein: the beam is an I-steel with two ends provided with sealing plates, equidistant stiffening ribs are arranged along the length direction, the lower flange is connected with the upright post end plate through bolts, and equidistant bolt holes are reserved on the upper flange along the length direction.
3. The device for testing the temperature gradient and the influence of the temperature gradient of the steel structure under the light radiation according to claim 1, wherein: the upright post is an I-steel with two ends provided with a flange, bolt holes are reserved on the plates and are bolted with the lower flange of the beam, and the lower sealing plate of the upright post is connected with a ground concrete base.
4. The device for testing the temperature gradient and the influence of the temperature gradient of the steel structure under the light radiation according to claim 1, wherein: the support consists of two ends of a wide flange I-steel, welding sealing plates and a cross rib plate in the middle, wherein the lower flange is provided with a bolt hole connected with the cross beam, and one side sealing plate is reserved with the bolt hole so as to be connected with a test object; the fixed support node is designed to be directly connected with the component end plate through bolts, and the hinge support node is additionally provided with an auxiliary lug plate connecting piece between the component end plate and the support through pins.
5. The device for testing the temperature gradient and the influence of the temperature gradient of the steel structure under the light radiation according to claim 1, wherein: the whole testing device is coated with antirust paint and/or wrapped with heat-insulating material.
6. The device for testing the temperature gradient and the influence of the temperature gradient of the steel structure under the light radiation according to claim 1, wherein: the control specimen support is made of equilateral angle steel and is connected with stiffening ribs on one side of the cross beam through bolts.
7. The device for testing the temperature gradient and the influence of the temperature gradient of the steel structure under the light radiation according to claim 1, wherein: the method comprises two parts of monitoring of temperature gradient and monitoring of influence of the temperature gradient on internal force and deformation of the structure.
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