by As an important part of the special review report on structural earthquake resistance, the elastic-plastic analysis of the structure has important guiding significance for structural engineers to understand the actual weak parts and energy dissipation mechanism of the structure.
The time cost of elastoplastic time history analysis is huge.
How to carry out elastoplastic time history analysis efficiently and accurately is the concern of structural engineers.
For the concrete structure system, the accurate introduction of component reinforcement is an important link affecting the analysis results.
This paper will introduce how to use yjk software to quickly and accurately import the component reinforcement into the elastic-plastic model.
In elastic-plastic analysis, concrete members should adopt actual reinforcement.
Generally, the accurate input of actual reinforcement is difficult to achieve.
The usual practice is to calculate reinforcement by using design software and consider appropriate correction.
There is still a big problem in the calculation and reinforcement input of members, because according to the current code, the performance-based design is usually carried out for out of gauge structures, and the performance objectives of key members are different from those of ordinary members.
For example, energy consuming members are usually controlled by small earthquake conditions, while the reinforcement of key members is usually controlled by medium earthquake or large earthquake conditions.
At present, the commonly used elastic-plastic interface program can usually read the calculated reinforcement of the software, but it is difficult to accurately input the envelope reinforcement of multiple models and working conditions of the same component.
If only the reinforcement calculation of small earthquake is read, the key components may enter the yield in advance under large earthquake, with serious damage and the risk of being questioned or even beaten back by overrun experts; If the medium earthquake or large earthquake calculation model is used for reinforcement, the bearing capacity of energy dissipation members will be greatly overestimated, and the results will deviate from the actual situation.
The author often uses perform3d, ABAQUS and Sauage software for elastoplastic time history analysis.
For the three kinds of software, by studying the elastic-plastic software interface often used by engineers, a fast and accurate method of inputting component reinforcement is summarized.
When using the interface program developed by other authors, readers can still refer to the principles introduced in this paper, and the ultimate goal can still be achieved in most cases.
Limited to space, this push only discusses the introduction of component reinforcement of perform3d model.
This paper introduces that the case design software adopts yjk, and the model is as follows.
There are two main ways for the interface software to read the component reinforcement from yjk: one is to read the WPJ *.
Automatically generated by the software Out file, and the other is to read dtlcalc YDB database files, or mixed reading mode as required.
This case demonstrates that perform3d interface program adopts PBSD software developed by South China University of technology.
Taking two shear walls (wall a and wall b) and two frame beams (beam a and beam B) in the demonstration model as examples, this paper demonstrates how to correctly import the reinforcement results of small earthquake and medium earthquake envelope design into perform3d model.
Through calculation and analysis, under the elastic condition of small earthquake, the reinforcement of edge members of wall a and wall B is 3300mm2, and the support reinforcement of beam a and beam B is 1400mm2; It is assumed that the performance goal of wall a and beam a is to resist bending and medium earthquake without yielding, and the performance goal of wall B and beam B is small earthquake elasticity; Under the medium earthquake non yield condition, the reinforcement of the edge member of wall a is 13300mm2, and the support reinforcement of beam a is 2300mm2.
Figure: reinforcement results under small earthquake condition: reinforcement results under medium earthquake condition.
The following will introduce how to import the reinforcement results of wall a and beam a and the reinforcement results of other components under small earthquake into the elastic-plastic model at the same time.
In order to achieve the goal, this paper mainly adopts the envelope design function provided by yjk software.
The envelope design menu of pre-processing is used to envelope the small earthquake model and medium earthquake model (which can also be realized by the performance envelope design module).
In the pre-processing – floor properties – envelope design component, specify wall a and beam a as envelope design components, and then run envelope design.
The results are as follows: in the calculation reinforcement diagram, the design results of wall a and beam a are the design results of medium earthquake model, and other components are the reinforcement results of small earthquake model.
(PS: at present, the envelope design function of yjk software is very flexible, which can realize the envelope design of multi model and multi working condition of components.
Please refer to the software manual for specific use).
Figure: output diagram of envelope design structure.
As mentioned above, the source of component reinforcement calculation read by interface software is mainly WPJ * Out file or dtlcalc YDB database file.
Find the corresponding file in the envelope design model folder and view the output of the corresponding component design results.
You can see whether it is WPJ * The reinforcement results of components corresponding to out file or reinforcement database are the results of envelope design.
Figure: output of reinforcement result of wall a in WPJ * out: the result output of wall a in the database file runs the elastic-plastic conversion interface software.
In order to compare the actual effect, the elastic-plastic model of the frame beam adopts the fiber model.
For the specific instructions of the software, please contact the author of the interface program.
Open the converted elastic-plastic model and compare the fiber division results of wall a, wall B, beam a and beam B respectively.
It can be found that the reinforcement fiber areas of wall a and beam a are envelope design results, and the reinforcement fiber areas of wall B and beam B are small earthquake reinforcement results.
By modifying dtlcalc YDB files and WPJ * By comparing the relevant data of out file, it is finally determined that the reinforcement data of beams, columns, walls and other components read by this interface are from dtlcalc YDB database file.
Figure: Section Fiber division diagram of wall a: Section Fiber division diagram of wall B: Section Fiber division diagram of beam a: Section Fiber division diagram of beam B to sum up, the goal of accurately importing reinforcement of components with different performance into elastic-plastic software is successfully realized by using the envelope design function provided by yjk software..
