CN111339710A - Concrete solid structure early strength integral judgment method - Google Patents
Concrete solid structure early strength integral judgment method Download PDFInfo
- Publication number
- CN111339710A CN111339710A CN202010421971.9A CN202010421971A CN111339710A CN 111339710 A CN111339710 A CN 111339710A CN 202010421971 A CN202010421971 A CN 202010421971A CN 111339710 A CN111339710 A CN 111339710A
- Authority
- CN
- China
- Prior art keywords
- age
- concrete
- construction
- finite element
- risk index
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a concrete solid structure early strength integral judgment method, belongs to the technical field of concrete structure construction control, and provides a solution for accurately analyzing the safety of a newly-built concrete structure, applying the method to quickly judge the safe construction age on site and improving the construction period connectivity. The method comprises the steps of firstly, obtaining the evolution rule of various mechanical parameters of concrete materials used in concrete engineering in an entity structure along with the age T by a test method; establishing an entity structure integral finite element analysis module based on the specific engineering structure design; then, carrying out finite element analysis by using the module according to different age conditions, searching for an age T 'meeting a specified risk index threshold R', and searching for a limit state by adopting an iterative approximation algorithm to determine a corresponding age; and finally, setting different risk index thresholds R 'according to different requirements of construction units on construction safety, thereby judging the safe construction age T' under the risk index.
Description
Technical Field
The invention relates to the technical field of concrete structure construction control, in particular to a concrete solid structure early strength integral judgment method.
Background
The efficiency of the engineering construction depends to a large extent on how to carry out the construction steps as quickly as possible while ensuring safety. For example, in the process of building super high-rise buildings, a large climbing construction platform is often adopted for the construction of a concrete main body structure. The construction platform is usually supported on a newly built part of the structure and when the strength of the part meets the requirements, the platform can be jacked up to pour a new layer of structure. In the current field construction, more maintenance time is generally reserved for a newly poured concrete structure due to the consideration of safety; on the other hand, the strength of the cast main body structure is judged by detecting the strength of the concrete test block cast in situ synchronously. Because the strength of solid concrete increases in a nonlinear mode of first-speed and second-speed along with time, and because actual structures and bearing modes thereof are different, the internal stress state is also highly complex, and the structural strength cannot be accurately judged by simply using a standard test.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a solution for accurately analyzing the safety of a newly-built concrete structure and applying the method to quickly judge the safety construction age on site and improve the construction period connectivity.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a concrete entity structure early strength integral judgment method comprises the following steps:
s1, acquiring an evolution rule of early mechanical parameters of concrete material molding used in specific engineering along with the age T by adopting a test method, and forming a database;
step S2, establishing an entity structure integral finite element analysis module based on the specific engineering structure design:
s21, selecting a new structure and establishing a three-dimensional finite element analysis model;
s22, adopting embedded rod units for steel bars in the model, defining a steel elastic-plastic constitutive model, and giving a yield stress; adopting a three-dimensional entity unit for concrete, selecting a plastic failure constitutive model, and respectively endowing the concrete material with tensile strength, compressive strength and fracture energy aiming at the simulated age T based on the database formed in the step S1;
s23, determining the loading mode of the construction platform on the newly-built structure according to the jacking principle of the construction platform, applying the load on the finite element model as a boundary condition, and carrying out operation; obtaining the structural overall risk index R of the current age T by analyzing the structural overall stress state, namely the ratio R of the maximum main stress of the concrete material at any point in the structure to the current tensile strength of the concretet=σmax/ftOr the ratio r of the absolute value of the minimum principal stress to the compressive strength of the concrete at presentc=σmin/fcThe maximum of the two ratios r = max (r)t, rc) The risk index for that point; the maximum value of the risk indices of all points in the entire finite element model is the overall risk index R = max (R) of the structure1, r2, …, ri) I represents all evaluation points in the finite element model;
step S3, carrying out finite element analysis by using the module in the step S2 according to different age conditions, searching for an age T 'meeting a specified risk index threshold R', and searching for a limit state by adopting an iterative approximation algorithm to determine a corresponding age;
step S4, setting different risk index threshold values R 'according to different requirements of construction units on construction safety, thereby determining the safe construction age T' under the risk index; r' must be less than 1; on the premise, if the set R 'is larger, the corresponding T' is small, and the construction rhythm is fast; on the contrary, if the set R' is small, the construction rhythm is slow.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention provides a concrete solid structure early strength integral judgment method, which comprises the following steps of firstly, obtaining various mechanical parameters of concrete materials used for specific engineering in a solid structure through a test method; secondly, establishing an entity structure integral finite element analysis module based on the specific engineering structure design; then, carrying out finite element analysis by using the module according to different age conditions, searching for an age T 'meeting a specified risk index value R', and searching for a limit state by adopting an iterative approximation algorithm to determine a corresponding age; and finally, setting different risk index thresholds R 'according to different requirements of construction units on construction safety, thereby judging the safe construction age T' under the risk index. The invention provides a construction opportunity judgment method based on the overall safety of a structure. On one hand, the judgment method can accurately obtain the safety limit state of a specific structure by carrying out fine analysis and calculation on the structure; on the other hand, the time for climbing the super high-rise building construction platform can be accurately judged according to the specific requirements of a construction party on risk control, so that the construction process engagement degree is more accurately and effectively improved compared with the existing method on the premise of ensuring safety, and the engineering efficiency is obviously improved.
Further, the step S1 includes:
s11, preparing a sufficient number of concrete test blocks, and maintaining the test blocks under different conditions according to the data acquisition requirements;
s12, obtaining complete stress-strain curves of concrete under different age T under axial compression and tension states through a compression test and a tensile test respectively;
s13, obtaining the evolution rule of each mechanical parameter of the concrete material in the solid structure along with the age T through the calibration with the field data, including the field same-condition maintenance test block test data.
Further, the step S2 includes: when a three-dimensional finite element analysis model is established for a newly-built structure, the grid density is increased for a key area such as a platform supporting point, so that a local complex stress state can be accurately reflected.
Further, the step S3 includes:
s31 finite element analysis for the first time, selecting an age T for the first time1As a calculation initial value;
s32 if the calculation result shows T1Risk index R at age1≥R’If the integral strength of the structure in the age is lower than the threshold value, the construction risk index is too high; starting a second finite element analysis, calculating the structural risk coefficient under a larger age, and calculating R2(ii) a On the contrary, if R1<R' indicates that the structure is safe; starting a second finite element analysis, calculating risk coefficients at a smaller age, and calculating R2；
S33 follows the following rules in the subsequent iterative approximation algorithm: if the corresponding age T is calculated for a certain timenAnd last calculation of Tn−1In the same way, i.e. RnAnd Rn−1Are both greater than or less than R', and RnRatio Rn−1Closer to R', the next calculation needs to pass through the formula Tn+1=2Tn−Tn−1Carrying out extension search on the age; if T isnAnd Tn−1The same conclusion applies, except that RnRatio Rn−1Farther away from R', the next calculation needs to pass through the formula Tn+1=2Tn−1−TnPerforming turning search on the age; if T isnAnd Tn−1Are different in conclusion, i.e. RnAnd Rn−1One of the two is larger than the other and smaller than R', the next calculation needs to pass through the formula Tn+1=(Tn+Tn−1) 2, halving the age to perform interpolation operation;
s34, adopting the iterative approximation algorithm to continuously reduce the search interval to approach the designated safe state, namely R 'and T', and when the m-th operation result meets a certain accuracy criterion, approximately considering the current TmIs the age to be determined.
Further, the accuracy criterion in step S34 is | Rm−R’|/R’<tol, tol being a preset accuracy of 1 × 10−4。
Drawings
Fig. 1 is a schematic diagram of rules followed by an iterative approximation algorithm in step S33 of the concrete solid structure early strength overall determination method according to an embodiment of the present invention.
Detailed Description
The method for determining the early strength of the concrete solid structure according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
Example one
The method for determining the early strength of the concrete solid structure according to the present invention will be described in detail with reference to fig. 1.
Referring to fig. 1, a method for integrally determining early strength of a concrete solid structure includes:
s1, acquiring an evolution rule of early mechanical parameters of concrete material molding used in specific engineering along with the age T by adopting a test method, and forming a database;
step S2, establishing an entity structure integral finite element analysis module based on the specific engineering structure design:
s21, selecting a newly-built structure, such as one or a plurality of layers of the latest building in a high-rise building, and establishing a three-dimensional finite element analysis model;
s22, adopting embedded rod units for steel bars in the model, defining a steel elastic-plastic constitutive model, and giving a yield stress; adopting a three-dimensional entity unit for concrete, selecting a plastic failure constitutive model, and respectively endowing the concrete material with tensile strength, compressive strength and fracture energy aiming at the simulated age T based on the database formed in the step S1;
s23, determining the loading mode of the construction platform on the newly-built structure according to the jacking principle of the construction platform, applying the load on the finite element model as a boundary condition, and carrying out operation; obtaining the structural overall risk index R of the current age T by analyzing the structural overall stress state, namely the ratio R of the maximum main stress of the concrete material at any point in the structure to the current tensile strength of the concretet=σmax/ftOr absolute value of minimum principal stress andcompressive strength ratio r of front concretec=σmin/fcThe maximum of the two ratios r = max (r)t, rc) The risk index for that point; the maximum value of the risk indices of all points in the entire finite element model is the overall risk index R = max (R) of the structure1, r2, …, ri) I represents all evaluation points in the finite element model;
step S3, carrying out finite element analysis by using the module in the step S2 according to different age conditions, and searching for an age T 'meeting a specified risk index threshold R', wherein the integral strength R and the age T of the new pouring structure are not in a linear proportional relation but are associated in a nonlinear mode, so that the trial-calculated age cannot be solved by simply scaling, and an iterative approximation algorithm is adopted to search for a limit state to determine the corresponding age.
Step S4, setting different risk index threshold values R 'according to different requirements of construction units on construction safety, thereby determining the safe construction age T' under the risk index; r' must be less than 1; on the premise, if the set R 'is larger, the corresponding T' is small, and the construction rhythm is fast, for example, R '= 0.7 is set, and T' =30 hours is obtained, which means that a floor can be built every 30 hours at the fastest speed; on the contrary, if the set R ' is small, the construction rhythm is slow, for example, if R ' =0.4 is set, and T ' =80 hours is obtained, it means that one floor can be built every 80 hours at the fastest.
Specifically, the invention provides a concrete solid structure early strength integral judgment method, which comprises the steps of firstly, obtaining various mechanical parameters of concrete materials used for specific engineering in a solid structure through a test method; secondly, establishing an entity structure integral finite element analysis module based on the specific engineering structure design; then, carrying out finite element analysis by using the module according to different age conditions, searching for an age T 'meeting a specified risk index value R', and searching for a limit state by adopting an iterative approximation algorithm to determine a corresponding age; and finally, setting different risk index thresholds R 'according to different requirements of construction units on construction safety, thereby judging the safe construction age T' under the risk index. The invention provides a construction opportunity judgment method based on the overall safety of a structure. On one hand, the judgment method can accurately obtain the safety limit state of a specific structure by carrying out fine analysis and calculation on the structure; on the other hand, the time for climbing the super high-rise building construction platform can be accurately judged according to the specific requirements of a construction party on risk control, so that the construction process engagement degree is more accurately and effectively improved compared with the existing method on the premise of ensuring safety, and the engineering efficiency is obviously improved.
In the present embodiment, more preferably, step S1 includes:
s11, preparing a sufficient number of concrete test blocks, and maintaining the test blocks under different conditions according to the data acquisition requirements;
s12, obtaining complete stress-strain curves of concrete under different age T under axial compression and tension states through a compression test and a tensile test respectively;
s13, obtaining the evolution rule of each mechanical parameter of the concrete material in the solid structure along with the age T through the calibration with the field data, including the field same-condition maintenance test block test data.
In this embodiment, it is more preferable that step S2 includes:
when a three-dimensional finite element analysis model is established for a newly-built structure, the grid density is increased for a key area such as a platform supporting point, so that a local complex stress state can be accurately reflected.
In the present embodiment, more preferably, step S3 includes:
s31 finite element analysis for the first time, selecting an age T for the first time1As a calculation initial value; for example, according to field experience, if the structure has sufficient overall strength after 72 hours, then T is set1=36 hours.
S32 if the calculation result shows T1Risk index R at age1If the integral strength of the structure in the age is larger than or equal to R', the integral strength of the structure in the age is lower than a threshold value, and the construction risk index is too high; starting a second finite element analysis, calculating the risk factor for the structure at a greater age, e.g. setting T2=72 hours, calculate R2(ii) a On the contrary, if R1<R' indicates that the structure is safe; starting a second finite element analysis, calculating risk factors at smaller ages, e.g. setting T2=18 hours, calculate R2；
S33 follows the following rules in the subsequent iterative approximation algorithm: if the corresponding age T is calculated at a certain time, as shown in FIG. 1 (a)nAnd last calculation of Tn−1In the same way, i.e. RnAnd Rn−1Are both greater than or less than R', and RnRatio Rn−1Closer to R', the next calculation needs to pass through the formula Tn+1=2Tn−Tn−1Carrying out extension search on the age; if T is shown in FIG. 1 (b)nAnd Tn−1The same conclusion applies, except that RnRatio Rn−1Farther away from R', the next calculation needs to pass through the formula Tn+1=2Tn−1−TnPerforming turning search on the age; if T is shown in FIG. 1 (c)nAnd Tn−1Are different in conclusion, i.e. RnAnd Rn−1One of the two is larger than the other and smaller than R', the next calculation needs to pass through the formula Tn+1=(Tn+Tn−1) 2, halving the age to perform interpolation operation;
s34, adopting the iterative approximation algorithm to continuously reduce the search interval to approach the designated safe state, namely R 'and T', and when the m-th operation result meets a certain accuracy criterion, approximately considering the current TmIs the age to be determined.
In the present embodiment, more preferably, the accuracy criterion in step S34 is | Rm−R’|/R’<tol, tol being a preset accuracy of 1 × 10−4。
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (5)
1. A concrete entity structure early strength integral judgment method is characterized by comprising the following steps:
s1, acquiring an evolution rule of early mechanical parameters of concrete material molding used in specific engineering along with the age T by adopting a test method, and forming a database;
step S2, establishing an entity structure integral finite element analysis module based on the specific engineering structure design:
s21, selecting a new structure and establishing a three-dimensional finite element analysis model;
s22, adopting embedded rod units for steel bars in the model, defining a steel elastic-plastic constitutive model, and giving a yield stress; adopting a three-dimensional entity unit for concrete, selecting a plastic failure constitutive model, and respectively endowing the concrete material with tensile strength, compressive strength and fracture energy aiming at the simulated age T based on the database formed in the step S1;
s23, determining the loading mode of the construction platform on the newly-built structure according to the jacking principle of the construction platform, applying the load on the finite element model as a boundary condition, and carrying out operation; obtaining the structural overall risk index R of the current age T by analyzing the structural overall stress state, namely the ratio R of the maximum main stress of the concrete material at any point in the structure to the current tensile strength of the concretet=σmax/ftOr the ratio r of the absolute value of the minimum principal stress to the compressive strength of the concrete at presentc=σmin/fcThe maximum of the two ratios r = max (r)t, rc) The risk index for that point; the maximum value of the risk indices of all points in the entire finite element model is the overall risk index R = max (R) of the structure1, r2, …, ri) I represents all evaluation points in the finite element model;
step S3, carrying out finite element analysis by using the module in the step S2 according to different age conditions, searching for an age T 'meeting a specified risk index threshold R', and searching for a limit state by adopting an iterative approximation algorithm to determine a corresponding age;
step S4, setting different risk index threshold values R 'according to different requirements of construction units on construction safety, thereby determining the safe construction age T' under the risk index; r' must be less than 1; on the premise, if the set R 'is larger, the corresponding T' is small, and the construction rhythm is fast; on the contrary, if the set R' is small, the construction rhythm is slow.
2. The determination method according to claim 1, wherein the step S1 includes:
s11, preparing a sufficient number of concrete test blocks, and maintaining the test blocks under different conditions according to the data acquisition requirements;
s12, obtaining complete stress-strain curves of concrete under axial compression and tension states at different ages through a compression test and a tension test respectively;
s13, obtaining each mechanical parameter of the concrete material in the solid structure through the calibration with the field data, including the field under the same condition maintenance test block test data.
3. The determination method according to claim 2, wherein step S2 includes: when a three-dimensional finite element analysis model is established for a newly-built structure, the grid density is increased for a key area such as a platform supporting point.
4. The determination method according to claim 1, wherein the step S3 includes:
s31 finite element analysis for the first time, selecting an age T for the first time1As a calculation initial value;
s32 if the calculation result shows T1Risk index R at age1If the integral strength of the structure in the age is larger than or equal to R', the integral strength of the structure in the age is lower than a threshold value, and the construction risk index is too high; starting a second finite element analysis, calculating the structural risk coefficient under a larger age, and calculating R2(ii) a On the contrary, if R1<R' indicates that the structure is safe; starting a second finite element analysis, calculating risk coefficients at a smaller age, and calculating R2；
S33 follows the following rules in the subsequent iterative approximation algorithm: if the corresponding age T is calculated for a certain timenAnd last calculation of Tn−1In the same way, i.e. RnAnd Rn−1Are both greater than or less than R', and RnRatio Rn−1Closer to R', the next calculation needs to pass through the formula Tn+1=2Tn−Tn−1Carrying out extension search on the age; if T isnAnd Tn−1The same conclusion applies, except that RnRatio Rn−1Farther away from R', the next calculation needs to pass through the formula Tn+1=2Tn−1−TnPerforming turning search on the age; if T isnAnd Tn−1Are different in conclusion, i.e. RnAnd Rn−1One of the two is larger than the other and smaller than R', the next calculation needs to pass through the formula Tn+1=(Tn+Tn−1) 2, halving the age to perform interpolation operation;
s34, adopting the iterative approximation algorithm to continuously reduce the search interval to approach the designated safe state, namely R 'and T', and when the m-th operation result meets a certain accuracy criterion, approximately considering the current TmIs the age to be determined.
5. The method according to claim 4, wherein the accuracy criterion in step S34 is | Rm−R’|/R’<tol, tol being a preset accuracy of 1 × 10−4。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010421971.9A CN111339710B (en) | 2020-05-19 | 2020-05-19 | Concrete solid structure early strength integral judgment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010421971.9A CN111339710B (en) | 2020-05-19 | 2020-05-19 | Concrete solid structure early strength integral judgment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111339710A true CN111339710A (en) | 2020-06-26 |
| CN111339710B CN111339710B (en) | 2020-08-04 |
Family
ID=71184922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010421971.9A Active CN111339710B (en) | 2020-05-19 | 2020-05-19 | Concrete solid structure early strength integral judgment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111339710B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113111490A (en) * | 2021-03-12 | 2021-07-13 | 重庆交通大学 | Ultrahigh-performance concrete strength design method based on strength threshold |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110250626A1 (en) * | 2002-09-09 | 2011-10-13 | Reactive Surfaces, Ltd. | Visual Assays for Coatings Incorporating Bioactive Enzymes for Catalytic Functions |
| JP5169875B2 (en) * | 2009-01-26 | 2013-03-27 | 株式会社Ｉｈｉ | Method for estimating crack index of concrete and method for designing concrete |
| CN105574250A (en) * | 2015-12-15 | 2016-05-11 | 中国电建集团中南勘测设计研究院有限公司 | Concrete material partition design method |
| CN109726485A (en) * | 2018-12-30 | 2019-05-07 | 中国水利水电科学研究院 | Concrete dam point true stress Predicting Reliability analysis method and device |
| CN110424457A (en) * | 2019-07-31 | 2019-11-08 | 上海城建物资有限公司 | Strong constraint overlapping in underground station serves as a contrast cast-in-place concrete structure method for controlling crack within the walls |
-
2020
- 2020-05-19 CN CN202010421971.9A patent/CN111339710B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110250626A1 (en) * | 2002-09-09 | 2011-10-13 | Reactive Surfaces, Ltd. | Visual Assays for Coatings Incorporating Bioactive Enzymes for Catalytic Functions |
| JP5169875B2 (en) * | 2009-01-26 | 2013-03-27 | 株式会社Ｉｈｉ | Method for estimating crack index of concrete and method for designing concrete |
| CN105574250A (en) * | 2015-12-15 | 2016-05-11 | 中国电建集团中南勘测设计研究院有限公司 | Concrete material partition design method |
| CN109726485A (en) * | 2018-12-30 | 2019-05-07 | 中国水利水电科学研究院 | Concrete dam point true stress Predicting Reliability analysis method and device |
| CN110424457A (en) * | 2019-07-31 | 2019-11-08 | 上海城建物资有限公司 | Strong constraint overlapping in underground station serves as a contrast cast-in-place concrete structure method for controlling crack within the walls |
Non-Patent Citations (2)
| Title |
|---|
| 张春霞等: "大体积箱梁混凝土结构施工期温控防裂仿真分析", 《公路工程》 * |
| 金贤玉等: "混凝土早龄期性能与裂缝控制", 《建筑结构学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113111490A (en) * | 2021-03-12 | 2021-07-13 | 重庆交通大学 | Ultrahigh-performance concrete strength design method based on strength threshold |
| CN113111490B (en) * | 2021-03-12 | 2022-04-29 | 重庆交通大学 | Ultrahigh-performance concrete strength design method based on strength threshold |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111339710B (en) | 2020-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102306943B1 (en) | Method of Predicting Reinforced Concrete Bridge Lifetime Under Seasonal Corrosion and Fatigue Bonding Actions | |
| Ortega et al. | Number of tests and corresponding error in concrete fatigue | |
| Pucinotti | Assessment of in situ characteristic concrete strength | |
| CN103513018B (en) | Systematic detection method for anti-cracking performance of concrete | |
| CN109522577B (en) | Concrete fatigue life prediction method and device based on Weibull equation and maximum fatigue deformation | |
| CN109522569B (en) | Concrete fatigue life prediction method and device based on Weibull equation and residual deformation | |
| CN110376058A (en) | The framework equipment that climbs adheres to concrete structural strength method of real-time | |
| CN111339710B (en) | Concrete solid structure early strength integral judgment method | |
| CN107478358A (en) | A kind of processing of concrete support stress monitoring data and optimization method | |
| CN106403858B (en) | A kind of superaltitude large cantilever steel platform tip deflection monitoring method | |
| CN111610092B (en) | Concrete entity structure construction cycle control system | |
| KR101045534B1 (en) | Method for evaluating structural integrity of steel fiber reinforced concrete pumping-up tunnel and recording medium thereof | |
| CN111259594A (en) | Long-term post-construction settlement prediction method based on settlement monitoring result of filling engineering | |
| Chertkov | The geometry of soil crack networks | |
| CN114996959A (en) | CT test piece life prediction method based on crack propagation | |
| CN107045559B (en) | Based on the bridge technology state deterioration appraisal procedure at bridge original state | |
| Pan et al. | Study on cracks in concrete structures and the database | |
| CN103323578B (en) | A kind of detection based on concrete structure durability and construction control method | |
| CN111222192A (en) | Evaluation method for collapsible formation collapsible deformation based on numerical calculation | |
| CN106407734B (en) | A kind of bridge technology state deterioration appraisal procedure introducing parameter lambda | |
| Han et al. | Quality control during construction of the Green Heart Tunnel on the basis of service life design | |
| CN116049935B (en) | Continuous box girder construction easy-cracking area identification and whole process digital monitoring method | |
| CN115506221B (en) | Precast box girder capable of controlling Liang Kongdao grouting plumpness | |
| CN117232671B (en) | Temperature measurement method and system for mass concrete temperature field | |
| CN118070651A (en) | Method for predicting residual life of fatigue crack propagation of turbine rotor steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |