CN102890739B - Stress removing and reinforcing method used for steel construction truss - Google Patents
Stress removing and reinforcing method used for steel construction truss Download PDFInfo
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Abstract
The invention discloses a stress removing and reinforcing method used for a steel construction truss. The stress removing and reinforcing method used for the steel construction truss is characterized by comprising the steps of: 1) detecting the actual stress state of the steel construction truss; 2) establishing a steel truss calculation model, and calculating the theoretical stress state of the steel construction truss; 3) analyzing the error between the actual stress state and the theoretical stress state of the steel construction truss; 4) correcting the steel truss calculation model by taking the actually-detected stress state as a reference; 5) adopting a revised steel truss computation model to carry out a simulation experiment; 6) carrying out a feasible optimal steel truss stress removing and reinforcing scheme design; 7) formulating a steel truss stress removing and reinforcing construction drawing; 8) carrying out the steel truss stress removing and reinforcing construction; and 9) monitoring the steel truss stress removing and reinforcing construction process. Compared with the prior art, the stress removing and reinforcing method has the beneficial effects that large construction mechanical equipment and unloading operation are not needed, and the original structure can be maintained, the construction volume is small, the consumption of materials is low, the construction is convenient, the cost is low and the reinforcing effect is good.
Description
Technical field
The present invention relates to stress removal to reinforce, particularly relate to a kind of stress removal reinforcement means for buildings steel truss.
Background technology
Comprise the steel truss of steel roof truss, steel bracket and crane beam, under the effect of the factors such as load, distortion, displacement and environment, very easily produce rod member warpage, deflection, distortion and distortion, cause its load-bearing capacity to decline, bad stability, even unstability is collapsed.Existing conventional steel truss reinforcement and rectification method mainly contains two kinds, one is reinforced under load condition, removal is not needed to act on load on steel truss, reinforce difficulty less, construct the easiest, workload is minimum, but, require the bearing capacity of original structure to have to be no less than 20% more than needed, and component does not have serious damage or serious distortion, otherwise is difficult to reach consolidation effect.Another kind reinforces under the whole load condition of unloading or reinforces under unloading part load condition, reinforces under unloading whole load condition, is applicable to structural failure or distortion load-bearing capacity that is serious or original structure component is too small, should not the steel truss of reinforcement on the spot; Reinforce under unloading part load condition, be applicable to structural damage or the more serious steel truss of distortion, the very high steel truss of stress of component, reinforcing construction must weaken temporarily bear the very large component of stress and the steel truss of connection, its defect is that reinforcing engineering amount is larger, costly, duration is longer, and unload all or part of load and directly affect normally carrying out of production, sometimes production suspension induced losses is also larger than reinforcing expense, particularly when steel truss Deformation Member is larger, when there is deformity out of plane, rectifying effect is undesirable.
Summary of the invention
Technical matters to be solved by this invention is the defect making up above-mentioned prior art, provides a kind of stress removal reinforcement means for buildings steel truss.
Technical matters of the present invention is solved by the following technical programs.
The feature of this stress removal reinforcement means for buildings steel truss is:
There are following steps successively:
1) buildings steel truss actual forced status is detected
Under load condition, adopt fluting method to detect the actual forced status of pressure detection point before reinforcing of each rod member being reinforced buildings steel truss one by one, described actual forced status comprises actual stress value and stress direction, judging hidden danger Producing reason and setting up steel truss computation model to provide foundation for analyzing, avoiding the blindness designing steel truss stress removal Scheme of Strengthening;
2) set up steel truss computation model, calculate the theoretical stress of buildings steel truss
Adopt SUPERSAP structure analysis software three-dimensional finite element analysis method, set up steel truss computation model, the simulation stress of steel truss under actual loading condition, the theoretical stress value of each rod member calculating steel truss and the node comprising pressure detection point, stress direction and displacement deformation value;
3) buildings steel truss actual forced status and theoretical stress error is analyzed
Analytical procedure 1) testing result there is error? if testing result exists error, repeat step 1);
At removal process 1) testing result there is the prerequisite of error under, contrast step 1) testing result and step 2) result of calculation, the error of both calculating, analyzes and produces the reason of error, whether correctly comprise described steel truss computation model?
4) with the actual forced status of surveying for benchmark correction steel truss computation model
Consider the impact of steel truss space behavior, the impact of support displacement and distortion, the impact of temperature stress, the impact of Deformation Member, the impact of rod member rigidity, revise the corresponding parameter of steel truss computation model, until step 2) result of calculation and step 1) testing result equal, make steel truss computation model meet the practical working situation of steel truss;
5) revised steel truss computation model is adopted to carry out emulation experiment
The internal force of one or more steel truss rod member of simulation removal, the ess-strain of each rod member of its steel truss and node is redistributed, revised steel truss computation model is adopted to carry out emulation experiment, determine the stress removal Scheme of Strengthening of the optimum be selected in, to correct rod member deflection, eliminate Deformation Member, reduce weak rod member internal force, to improve steel truss load-bearing capacity;
6) enforceable optimum steel truss stress removal Scheme of Strengthening design is carried out
The stress removal Scheme of Strengthening design of described optimum, comprise that rod member stress removal method and order, temporary support allocation method, ess-strain control point are chosen, work progress monitoring, reinforcement and strengthening measure, set up rod member arrangements, construction safety coefficient, complexity of constructing, quantities, structural stability evaluate, and consolidation effect is evaluated;
7) steel truss stress removal strengthening construction figure is worked out
Division strengthening construction figure is unloaded with reference to national standard or standardize organization steel truss stress;
8) steel truss stress removal strengthening construction is carried out
According to the steel truss stress removal strengthening construction figure of establishment, set up workbench, set up stable temporary support at steel truss two ends, reserved enough safety coefficient, guarantee being perfectly safe of stress detach procedure, remove the rod member needing stress removal again, redistributed at rod member stress, and after reaching designing requirement, rod member is reinforced in supplement immediately, remove temporary support again, prevent structural instability;
9) steel truss stress removal work progress is monitored
According to establishment steel truss stress removal strengthening construction figure and step 5) experimental result, formulate steel truss stress removal work progress monitoring scheme, adopt working properly, the reliable stress-strain test system of stable reading to monitor the whole process that steel truss stress removal is constructed, reach the requirement of design with proof stress removal, reinforcement of rod pieces.
Technical matters of the present invention is solved by following further technical scheme.
Described step 1) fluting method be at rod member strain measuring point adhering resistance strain sheets, mechanical means is adopted to slot at resistance strain gage two ends, the degree of depth of groove is 0.3 ~ 0.4 times of separation, make rod member strain the local stress acquisition of measuring point place to discharge completely, namely the constraint around rod member strain measuring point is removed, make resistance strain gage produce elasticity and recover distortion, measure strain relief value before and after fluting, calculate by following formula the actual stress value that rod member strains measuring point: σ=-E ε; In formula: σ: the actual stress value of rod member strain measuring point; ε: strain relief value before and after fluting; E: elastic modulus.
Described step 2) steel truss computation model be the computation model of space behavior considering structure, its parameter comprises simulation steel truss calculation diagram, the loading condition acted on steel truss, column joints deformation condition and constraint condition, bearing deformation condition and constraint condition.
Described step 2) SUPERSAP structure analysis software be comprise stress and strain model, automatic modeling, figure display and the three-dimensional finite element analysis system of aftertreatment, for the static analysis of structure, dynamic analysis, nonlinear analysis and heat conduction analysis.
Described step 5) emulation experiment, be the overall process that the stress removal of simulating steel truss on house computers is reinforced, substitute the full size equal with the physical size cun emulation experiment that multiple steel truss stress removal Scheme of Strengthening is carried out in on-the-spot or laboratory.
A described full size cun emulation experiment is formulated according to the concrete condition of engineering, described concrete condition comprises version, span, the deformation damage order of severity, construction condition, the magnitude of load of steel truss, described full size cun emulation experiment comprises the steel truss ess-strain redistribution situation after the different rod member of removal steel truss, observation rod member stress removal, and more different stress removal Scheme of Strengthening is to the improvement degree of steel truss load-bearing capacity.
Described step 5) the stress removal Scheme of Strengthening of optimum, the weak rod member ess-strain being not only load-bearing capacity difference reduces at most, load-bearing capacity improves maximum and the bearing capacity of remaining all rod member all meets the stress removal Scheme of Strengthening that existing national regulation requires, and be meet that construction condition requires, stress removal Scheme of Strengthening is practical, difficulty of construction is relatively little, quantities is relatively little, consolidation effect good, security is high, can ensure the safety of site operation personnel and equipment, and the stress removal Scheme of Strengthening that expense is relatively less.
Described step 7) national standard or specification, comprise China Engineering Construction Standardization Association's " steel structure strengthening technology specification ", " steel truss inspection and acceptance criteria ", " Code for design of steel structures ", and " structural steelwork job specifications ".
Described step 7) steel truss stress unload division strengthening construction figure, comprise the ess-strain redistribution figure before and after steel truss rod member removal working drawing, each rod member stress removal of steel truss, steel truss stress removal work progress surveillance map, steel truss temporary support working drawing, and steel truss reinforcing working drawing.
Described step 9) steel truss stress removal work progress monitoring scheme, comprise the ess-strain monitoring in the stress-strain test before each rod member stress removal of steel truss, each rod member stress detach procedure of steel truss, and steel truss stress removal consolidation effect is evaluated.
Stress-strain test before each rod member stress removal of described steel truss is under load condition, adopt fluting method to detect each rod member being reinforced buildings steel truss one by one the actual stress value of pressure detection point before reinforcing and stress direction.
Ess-strain monitoring in each rod member stress detach procedure of described steel truss, is according to steel truss computer simulation model the simulation experiment result, draws the redistribution figure of the ess-strain calculated value before and after each rod member stress removal of steel truss.
Described steel truss stress removal consolidation effect is evaluated, comprise the redistribution figure of the ess-strain measured value before and after the calculated value redistribution figure of the ess-strain before and after compared steel truss stress removal and steel truss stress removal, whether conform to as evaluating steel truss stress removal using the two and reinforce the foundation reaching designing requirement.
Described step 9) the whole process of steel truss stress removal construction is monitored, arrange ess-strain monitoring point on each rod member of steel truss, whole process supervision is carried out to work progress, the changing value of ess-strain in record rod member stress detach procedure, fill in ess-strain monitoring record form, draw the redistribution figure of the ess-strain measured value before and after each rod member stress removal of steel truss, whether each rod member stress removal of monitoring steel truss reaches designing requirement.
Stress removal reinforcement means beneficial effect compared with prior art for buildings steel truss of the present invention is: without the need to large-scale construction equipment equipment, without the need to unloading, retains original structure, construction volume is little, and material usage is few, easy construction, low cost, consolidation effect is good.
Accompanying drawing explanation
Fig. 1 is the skylight frame of the specific embodiment of the invention and the version figure of roof truss;
Fig. 2 is the roof truss of the specific embodiment of the invention and the support arrangement figure that winds up;
Fig. 3 be the specific embodiment of the invention the actual measurement under load of each rod member of skylight frame in force value and Impact direction figure.
Embodiment
Contrast accompanying drawing below in conjunction with embodiment the present invention will be described.
A kind of steel truss stress removal reinforced construction method of certain steel-making main building as shown in Figures 1 to 3, main building system four connects across factory building, middle two across being steel roof truss structure, concrete macrotype roof boarding, skylight frame is provided with above middle colonnade, after being constructed and put into operation, the skylight frame main diagonal of 80% occurs that obvious out-of plane bending is out of shape, and maximum flexibility amount of side-shift reaches 170mm, and has obvious lateral deflection feature.
Specific embodiments has following steps successively:
1) buildings steel truss actual forced status is detected, judge hidden danger Producing reason and set up steel truss computation model to provide foundation for analyzing, avoid the blindness designing steel truss stress removal Scheme of Strengthening, the actual stress value of the pressure detection point adopting fluting method to detect each rod member being reinforced buildings steel truss one by one under load condition before reinforcing and stress direction, the concrete enforcement of fluting method is at rod member strain measuring point adhering resistance strain sheets, rod member strain point layout is in the middle of rod member, two tips of angle steel, mechanical means is adopted to slot at resistance strain gage two ends, the degree of depth of groove is 2mm, it is 0.4 times of separation 5mm, make rod member strain the local stress acquisition of measuring point place to discharge completely, namely the constraint around rod member strain measuring point is removed, make resistance strain gage produce elasticity and recover distortion, measure strain relief value before and after fluting, the actual stress value that rod member strains measuring point is calculated: σ=-E ε by following formula, in formula: σ: the actual stress value of rod member strain measuring point, ε: strain relief value before and after fluting, E: elastic modulus,
The actual stress value of the rod member strain measuring point calculated is shown in Fig. 3, and the corresponding calculated value calculated according to steel truss computation model is in figure 3 in bracket, and in figure, the stress value of rod member has been scaled the interior force value of rod member, and unit is kN;
2) the steel truss computation model of the space behavior considering structure is set up, its parameter comprises simulation steel truss calculation diagram, act on the loading condition on steel truss, column joints deformation condition and constraint condition, bearing deformation condition and constraint condition, employing comprises stress and strain model, automatic modeling, the SUPERSAP structure analysis software three-dimensional finite element analysis method of the three-dimensional finite element analysis system of figure display and aftertreatment, set up steel truss computation model, the stress of simulation steel truss under actual loading condition, calculate each rod member of steel truss and the theoretical stress value of node, stress direction and displacement deformation value,
3) buildings steel truss actual forced status and theoretical stress error is analyzed
Analytical procedure 1) testing result there is error? if testing result exists error, repeat step 1);
At removal process 1) testing result there is the prerequisite of error under, contrast step 1) testing result and step 2) result of calculation, the error of both calculating, analyze the reason producing error, whether correctly comprise steel truss computation model? final error identifying Producing reason is: skylight frame and roof truss co-operation are not considered in former design;
4) with the actual forced status of surveying for benchmark correction steel truss computation model
Consider the impact of steel truss space behavior, the impact of support displacement and distortion, the impact of temperature stress, the impact of Deformation Member, the impact of rod member rigidity, revise the corresponding parameter of steel truss computation model, until step 2) result of calculation and step 1) testing result equal, make steel truss computation model meet the practical working situation of steel truss;
5) overall process that the stress removal adopting revised steel truss computation model to carry out simulating steel truss on house computers is reinforced, the full size equal with the physical size cun emulation experiment of multiple steel truss stress removal Scheme of Strengthening is carried out in alternative scene or laboratory;
The internal force of one or more steel truss rod member of simulation removal, the ess-strain of each rod member of its steel truss and node is redistributed, revised steel truss computation model is adopted to carry out full size cun emulation experiment, full size cun emulation experiment is according to the version of steel truss, span, the deformation damage order of severity, construction condition, magnitude of load, a described full size cun emulation experiment comprises the different rod member of removal steel truss, the steel truss ess-strain redistribution situation after stress removal of observing is formulated, and more different stress removal Scheme of Strengthening is to the improvement degree of steel truss load-bearing capacity, determine the stress removal Scheme of Strengthening of the optimum be selected in, to correct rod member deflection, eliminate Deformation Member, reduce weak rod member stress, improve steel truss load-bearing capacity,
Determine that the stress removal Scheme of Strengthening of the optimum be selected in is: the stress shedding skylight frame main diagonal, the stress of each rod member of adjustment skylight frame, correct the main diagonal deformity out of plane of flexing, the scheme that supplement web member is reinforced, the weak rod member ess-strain being not only load-bearing capacity difference reduces at most, load-bearing capacity improves maximum, and the bearing capacity of remaining all rod member all meets the stress removal Scheme of Strengthening that existing national regulation requires, and be meet construction condition requirement, stress removal Scheme of Strengthening is practical, difficulty of construction is relatively little, quantities is relatively little, consolidation effect is good, security is high, the safety of site operation personnel and equipment can be ensured, and the stress removal Scheme of Strengthening that expense is relatively less,
Emulation experiment finds out skylight frame main diagonal out-of plane bending distortion Producing reason: skylight frame main diagonal is former is designed to zero bar, and field actual measurement results main diagonal actual be depression bar, and substantially exceeded Euler's critical force, thus main diagonal out-of plane bending is caused to be out of shape;
6) enforceable optimum steel truss stress removal Scheme of Strengthening design is carried out
The stress removal Scheme of Strengthening design of described optimum, comprise that stress removal method and order, temporary support allocation method, ess-strain control point are chosen, work progress monitoring, reinforcement and strengthening measure, set up rod member arrangements, construction safety coefficient, complexity of constructing, quantities, structural stability evaluate, and consolidation effect is evaluated;
7) steel truss stress removal strengthening construction figure is worked out
With reference to comprising China Engineering Construction Standardization Association's " steel structure strengthening technology specification ", " steel truss inspection and acceptance criteria ", " Code for design of steel structures ", and the national standard of " structural steelwork job specifications " or specification, work out the ess-strain redistribution figure, steel truss removal work progress surveillance map, the steel truss temporary support working drawing that comprise before and after steel truss rod member removal working drawing, each rod member stress removal of steel truss, and the steel truss stress of steel truss reinforcing working drawing unloads division strengthening construction figure;
8) steel truss stress removal strengthening construction is carried out
According to the steel truss stress removal strengthening construction figure of establishment, set up workbench, set up stable temporary support at steel truss two ends, reserved enough safety coefficient, guarantee being perfectly safe of stress detach procedure, remove the rod member needing stress removal again, redistributed at rod member stress, and after reaching designing requirement, rod member is reinforced in supplement immediately, remove temporary support again, prevent structural instability;
9) steel truss stress removal work progress is monitored
According to establishment steel truss stress removal strengthening construction figure and step 5) experimental result, formulation comprises the stress-strain test before each rod member stress removal of steel truss, the monitoring of the ess-strain in each rod member stress detach procedure of steel truss, and the steel truss stress removal work progress monitoring scheme of steel truss stress removal effect assessment, adopt working properly, the reliable stress-strain test system of stable reading to monitor the whole process that steel truss stress removal is constructed, reach the requirement of design with proof stress removal, reinforcement of rod pieces;
Stress-strain test before each rod member stress removal of steel truss is under load condition, adopt fluting method to detect each rod member being reinforced buildings steel truss one by one the actual stress value of pressure detection point before reinforcing and stress direction;
Ess-strain monitoring in each rod member stress detach procedure of steel truss, is according to steel truss computer simulation model the simulation experiment result, draws the redistribution figure of the ess-strain calculated value before and after each rod member removal of steel truss;
Steel truss stress removal effect assessment, comprise the redistribution figure of the ess-strain measured value before and after the calculated value redistribution figure of the ess-strain before and after compared steel truss stress removal and steel truss stress removal, whether conform to as the foundation evaluating steel truss stress removal and reach designing requirement using the two;
The whole process of steel truss stress removal construction is monitored, arrange ess-strain monitoring point on each rod member of steel truss, whole process supervision is carried out to work progress, the changing value of ess-strain in record rod member stress detach procedure, fill in ess-strain monitoring record form, draw the redistribution figure of the ess-strain measured value before and after each rod member stress removal of steel truss, each rod member stress removal of monitoring steel truss reinforces whether reach designing requirement.
Compared with the solid scheme of " stress removal Scheme of Strengthening " and traditional " replacing skylight frame " that this specific implementation method adopts, the solid scheme of " unload skylight frame roofing and concrete macrotype roof boarding is replaced by light-weight roof slab ", advantage is without the need to large-scale construction equipment equipment, without the need to unloading, retain original skylight frame and concrete macrotype roof boarding is constant, construction volume is little, and material usage is few, easy construction, low cost, consolidation effect is good.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; make some equivalent alternative or obvious modification without departing from the inventive concept of the premise; and performance or purposes identical, all should be considered as belonging to the scope of patent protection that the present invention is determined by submitted to claims.
Claims (10)
1., for a stress removal reinforcement means for buildings steel truss, it is characterized in that:
There are following steps successively:
1) buildings steel truss actual forced status is detected
Under load condition, adopt fluting method to detect the actual forced status of pressure detection point before reinforcing of each rod member being reinforced buildings steel truss one by one, described actual forced status comprises actual stress value and stress direction;
2) set up steel truss computation model, calculate the theoretical stress of buildings steel truss
Adopt SUPERSAP structure analysis software three-dimensional finite element analysis method, set up steel truss computation model, the stress of simulation steel truss under actual loading condition, calculate each rod member of steel truss and the theoretical stress of node, described theoretical stress comprises theoretical stress value, stress direction and displacement deformation value;
3) buildings steel truss actual forced status and theoretical stress error is analyzed
Analytical procedure 1) testing result there is error? if testing result exists error, repeat step 1);
At removal process 1) testing result there is the prerequisite of error under, contrast step 1) testing result and step 2) result of calculation, the error of both calculating, analyzes and produces the reason of error, whether correctly comprise described steel truss computation model?
4) with the actual forced status of surveying for benchmark correction steel truss computation model
Consider the impact of steel truss space behavior, the impact of support displacement and distortion, the impact of temperature stress, the impact of Deformation Member, the impact of rod member rigidity, revise the corresponding parameter of steel truss computation model, until step 2) result of calculation and step 1) testing result equal, make steel truss computation model meet the practical working situation of steel truss;
5) revised steel truss computation model is adopted to carry out emulation experiment
The internal force of one or more steel truss rod member of simulation removal, makes the ess-strain of each rod member of its steel truss and node redistribute, adopts revised steel truss computation model to carry out emulation experiment, determine the steel truss stress removal Scheme of Strengthening of the optimum be selected in;
6) enforceable optimum steel truss stress removal Scheme of Strengthening design is carried out
The steel truss stress removal Scheme of Strengthening of described optimum, comprise that stress removal method and order, temporary support allocation method, ess-strain control point are chosen, work progress monitoring, reinforcement and strengthening measure, set up rod member arrangements, construction safety coefficient, complexity of constructing, quantities, structural stability evaluate, and consolidation effect is evaluated;
7) steel truss stress removal strengthening construction figure is worked out
Division strengthening construction figure is unloaded with reference to national standard or standardize organization steel truss stress;
8) steel truss stress removal strengthening construction is carried out
According to the steel truss stress removal strengthening construction figure of establishment, set up workbench, stable temporary support is set up at steel truss two ends, reserved enough safety coefficient, remove the rod member needing stress removal again, redistributed at rod member stress, and after reaching designing requirement, rod member is reinforced in supplement immediately, then removes temporary support;
9) steel truss stress removal work progress is monitored
According to establishment steel truss stress removal strengthening construction figure and step 5) experimental result, formulate steel truss stress removal work progress monitoring scheme, adopt working properly, the reliable stress-strain test system of stable reading to monitor the whole process that steel truss stress removal is constructed.
2., as claimed in claim 1 for the stress removal reinforcement means of buildings steel truss, it is characterized in that:
Described step 1) fluting method be at steel truss rod member strain measuring point adhering resistance strain sheets, mechanical means is adopted to slot at resistance strain gage two ends, the degree of depth of groove is 0.3 ~ 0.4 times of separation, make rod member strain the local stress acquisition of measuring point place to discharge completely, namely the constraint around rod member strain measuring point is removed, make resistance strain gage produce elasticity and recover distortion, measure strain relief value before and after fluting, calculate by following formula the actual stress value that rod member strains measuring point: σ=-E ε; In formula: σ: the actual stress value of rod member strain measuring point; ε: strain relief value before and after fluting; E: elastic modulus.
3., as claimed in claim 1 or 2 for the stress removal reinforcement means of buildings steel truss, it is characterized in that:
Described step 2) steel truss computation model be the computation model of space behavior considering structure, its parameter comprises simulation steel truss calculation diagram, the loading condition acted on steel truss, column joints deformation condition and constraint condition, bearing deformation condition and constraint condition.
4., as claimed in claim 3 for the stress removal reinforcement means of buildings steel truss, it is characterized in that:
Described step 2) SUPERSAP structure analysis software be comprise stress and strain model, automatic modeling, figure display and the three-dimensional finite element analysis system of aftertreatment.
5., as claimed in claim 4 for the stress removal reinforcement means of buildings steel truss, it is characterized in that:
Described step 5) emulation experiment, be the overall process that the stress removal of simulating steel truss on house computers is reinforced, substitute the full size equal with the physical size cun emulation experiment that multiple steel truss removal Scheme of Strengthening is carried out in on-the-spot or laboratory.
6., as claimed in claim 5 for the stress removal reinforcement means of buildings steel truss, it is characterized in that:
A described full size cun emulation experiment is formulated according to the concrete condition of engineering, described concrete condition comprises version, span, the deformation damage order of severity, construction condition, the magnitude of load of steel truss, described full size cun emulation experiment comprises the steel truss ess-strain redistribution situation after the different rod member of removal steel truss, observation removal rod member stress, and more different stress removal Scheme of Strengthening is to the improvement degree of steel truss load-bearing capacity.
7., as claimed in claim 6 for the stress removal reinforcement means of buildings steel truss, it is characterized in that:
Described step 7) national standard or specification, comprise China Engineering Construction Standardization Association's " steel structure strengthening technology specification ", " steel truss inspection and acceptance criteria ", " Code for design of steel structures ", and " structural steelwork job specifications ".
8., as claimed in claim 7 for the stress removal reinforcement means of buildings steel truss, it is characterized in that:
Described step 7) steel truss stress unload division strengthening construction figure, comprise the ess-strain redistribution figure before and after steel truss rod member removal working drawing, each rod member stress removal of steel truss, steel truss stress removal work progress surveillance map, steel truss temporary support working drawing, and steel truss reinforcing working drawing.
9., as claimed in claim 8 for the stress removal reinforcement means of buildings steel truss, it is characterized in that:
Described step 9) steel truss stress removal strengthening construction process monitoring scheme, comprise in the stress-strain test before each rod member stress removal of steel truss, each rod member stress detach procedure of steel truss ess-strain monitoring.
10., as claimed in claim 9 for the stress removal reinforcement means of buildings steel truss, it is characterized in that:
Described step 9) the whole process of steel truss stress removal construction is monitored, be the changing value of ess-strain in record stress detach procedure, fill in ess-strain monitoring record form, whether each rod member stress removal of monitoring steel truss reaches designing requirement.
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| CN101016728A (en) * | 2007-02-06 | 2007-08-15 | 同济大学 | Construction monitoring method for exchanging course of half/through arch bridge suspender |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016728A (en) * | 2007-02-06 | 2007-08-15 | 同济大学 | Construction monitoring method for exchanging course of half/through arch bridge suspender |
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| A Review o f structural health monitoring literature;H.Sohn等;《LANL Report LA-13976-MS》;20031231;全文 * |
| SUPERSAP 结构分析软件包介绍;唐大泽等;《北方交通大学学报》;19890702;第134页 * |
| 刘金梅.在用石油井架结构分析、测定及评定理论.《万方数据-学位论文》.2004,第3-5、9-14、21、27、34、40、51-54页. * |
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| 肖雅文.面向对象的有限元和井架仿真系统.《中国优秀硕士学位论文全文数据库》.2003,第41-42页. * |
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| CN102890739A (en) | 2013-01-23 |
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