JP3859616B2 - Structural analysis program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure analysis program for analyzing a frame structure in steel bridge design, and more particularly to a structure analysis program that makes it easy for a designer to input data.
[0002]
[Prior art]
For example, when designing a steel bridge, a model is constructed in which a bridge is constructed on a frame structure composed of a main girder and a cross girder, and loads acting on vehicles such as cars and trains moving on the steel bridge are measured. It is necessary to analyze. Loads on steel bridges vary depending on the environment in which they are used, such as road bridges with sidewalks through which cars and people pass, railway bridges through which trains pass, and even in areas with heavy snowfall. It may be a steel bridge to be built. In each of these environments, it is necessary to design the frame structure assuming various loads such as moving loads and distributed loads in addition to the weight of the steel bridge itself.
[0003]
Therefore, the design of the steel bridge is briefly described. FIG. 14 is a view showing a flowchart of the steel bridge design. The steel bridge design is roughly divided into the structural analysis of the main girder and cross girder that constitute the framework of the steel bridge, and when the load is actually applied to the steel bridge in the obtained frame structure, the steel bridge is safely constructed. The main girder is obtained. Conventionally, steel bridge design software has been used for such work, and the design has been carried out according to a structural analysis program read into a computer.
[0004]
In the structure analysis program, a model is first created for the frame structure of the steel bridge (S11). The framework structure is modeled by inputting linear data, and the model is a plane steel frame framework displayed on a display as shown in FIGS. Here, in order to describe a steel bridge having a simple shape, only a main girder hung in the longitudinal direction of the steel bridge and a horizontal girder hung in the width direction of the steel bridge orthogonal thereto are considered.
[0005]
For modeling, linear data linearly calculated based on the steel bridge is input. Then, it is necessary to set an element (member) number between a rating point and a rating point at which the main beam and the horizontal beam intersect. In the case of this conventional example, the grade numbers 101 to 1308 are assigned in order, and the element number is expressed as 101-201 connecting the grade numbers. In the input screen shown in FIG. 10, the coordinates (X, Y) and the loading conditions from the linear calculation result corresponding to the rating number are input for each rating. Next, the input menu is switched to the screen shown in FIG. 11, and element input is performed on the members between the grades.
[0006]
The elements to be input are the cross-sectional shape of both ends (i-end, j-end) of the member and the coupling conditions. This cross-sectional shape can be specified by a grading number, and the corresponding grading number is input. It has become so. A model of the frame structure that constitutes the steel bridge is created by such input work. When the model creation work is completed, the load input to the steel bridge is performed next. The input menu is switched to the screen shown in FIG. 12, and various loads are input. In the drawing, an input menu for inputting concentrated dead load, that is, the weight of the steel bridge itself is shown. Therefore, referring to the previously set grade number, the load is input for each number.
[0007]
Thus, by inputting various loads, structural analysis is performed according to the modeled framework structure by computer processing (S12). Then, for example, a structural analysis calculation sheet as shown in FIG. 13 is output (S13). FIG. 13 is a diagram showing a part of the structural analysis calculation sheet, which is output so as to identify the member corresponding to the previously set grade number.
After the structural analysis of the steel bridge is performed in this way, the main girder design is started. Although not specifically shown, numbers are assigned to the main and horizontal girders, and design conditions are input using the numbers (S14). Then, a main girder calculation main power corresponding to the design condition is performed based on the main girder and horizontal girder subjected to the structural analysis (S15).
[0008]
[Patent Document 1]
Japanese Patent Laid-Open No. 09-166957 [0009]
[Problems to be solved by the invention]
However, in the conventional structural analysis program shown in FIG. 10 to FIG. 12, in order to model the framework structure, first, the grade number is set and inputted, and the designer inputs data based on the grade number in the subsequent work. Had gone. Therefore, it is necessary for the designer to proceed while taking the correspondence between the grade number and the main girder and cross girder actually constituting the steel bridge, and the confirmation work to be performed each time is complicated and difficult to understand (actual steel The bridge design is much more complicated than the models shown in FIGS. 10 to 12), and the work efficiency is low and input errors are likely to occur. In the output, since the correspondence with the rating number is taken for confirmation, it is not easy to confirm at first glance but difficult to confirm.
[0010]
Therefore, an object of the present invention is to provide a structural analysis program that makes it easy for a designer to input data and the like in order to solve such problems.
[0011]
The structural analysis program of the present invention is a model for modeling a framework structure of a steel bridge having a main girder and a horizontal girder, inputting predetermined data based on the model, and executing structural analysis on hardware. Then, define the longitudinal and transverse lines of the steel bridge by assigning line names to the lines on the linear calculation, and the grades of the positions where each line intersects, the member elements between the grades, and the position or range of action of the load Is specified by a line name, and data is input and output.
[0012]
Further, the structure analysis program of the present invention registers the line names corresponding to the main and horizontal digits from the longitudinal and transverse lines as main digits or horizontal digits, and inputs and outputs data according to the line names. It is characterized by that.
[0013]
In addition, the structural analysis program of the present invention displays on the screen a model of a skeleton structure having main and horizontal girders with line names on the display and a data input unit by being read by hardware. It is characterized in that predetermined data is input to the displayed screen.
[0014]
Therefore, according to the present invention, line names are assigned to main girders and horizontal girders, and a grade, a member element, and an action position or an action range of a load are specified from the line name. Therefore, when a designer performs load input or when reading output data, for example, the position of the main girder and horizontal girder is specified from the entire model according to the line name, and the grade and member elements are further identified from the model line. To figure out. Therefore, the designer can smoothly search from a wide range to a narrow point, and if the main digit name with which the line name is familiar, it becomes easier to specify the grading point and the data for the designer. The input work etc. become easy.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, a structural analysis program according to the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view showing a steel bridge, FIG. 2 is a side view showing the longitudinal direction, and FIG. 3 is a cross-sectional view in the width direction. The steel bridge 1 is crossed with the main girder in the longitudinal direction and has a horizontal girder as in the conventional example. In the present embodiment, as shown in FIG. 1, the main girder is composed of 8 pieces of G1 to G8, and the transverse beam is composed of a total of 12 pieces of S1 and S2 at both ends and intermediate C1 to C10.
[0016]
This steel bridge 1 is a road bridge having a roadway 2 and a sidewalk 3 as shown in FIG. 3, on which a reinforced concrete floor board 4 is placed on a frame structure composed of a main girder and a cross girder, on which an asphalt pavement is provided. 5 is given. On the steel bridge 1, a separation band 6 is formed in the center, a roadway 2 is provided on the left and right sides thereof, and a sidewalk 3 is provided on the outer side with the roadway and a guard rail 7 therebetween. And the fall prevention fence 8 is provided in the both sides of the steel bridge 1 on the outer side of a sidewalk.
[0017]
About such steel bridge 1, we investigate how to apply the own weight (dead load) when reinforced concrete floor board 4 and asphalt pavement 5 are applied, and the moving load (live load) of the automobile running on steel bridge 1, and the load It is necessary to conduct a structural analysis of the framework so that it can sufficiently withstand. Based on the structural analysis, the main girder and the horizontal girder are designed. The work flow relating to the design of the steel bridge 1 is performed in the same manner according to the flowchart of FIG. 14 shown in the conventional example.
[0018]
However, in the present embodiment, a new structural analysis program is proposed, which is characterized by structural analysis related to the framework in the steel bridge 1. This structural analysis program is read into a computer and executed by the computer performing arithmetic processing by an input operation of a designer. Therefore, the work procedure by the structural analysis program will be described below while showing a computer display operated by the designer.
[0019]
4 to 7 show screens displayed on the display of the personal computer shown to the designer when executing the structural analysis. Therefore, first, the designer inputs linear data for the steel bridge 1 at the time of completion shown in FIGS. 1 to 3 to be designed. The linear data includes the X-axis, Y-axis, and Z-axis coordinates, the angle, and the total length from the end.
[0020]
In order to create a framework model based on linear data, it is necessary to define the basic shape lines of steel bridges, namely longitudinal and transverse lines. Therefore, a line name is first given to the line on the linear calculation. Therefore, in addition to the main girders G1 to G8 constituting the skeleton shown in FIG. 3, lines L1 to R1 set according to lanes and sidewalks are defined for the road portions supported by the longitudinal lines in the X-axis direction. , Each is set as a line name. In addition, A1 to A2 shown in FIG. 2 are respectively defined in the crossing lines and set as line names.
[0021]
Here, among the longitudinal lines shown in FIG. 3, the line L1 is the uppermost line, the line CL is a line indicating the left and right centers in the shape of the steel bridge 1, and the line G-CLR is the left and right of the steel bridge. It is a line which shows the gravity center of a direction. On the other hand, in the crossing line, the lines A1, A2 other than the horizontal beams S1, S2, C1 to C10 indicate the original position, and the lines GEA, GE2, P1 indicate the support position.
[0022]
This linear data is input by inputting the linear coordinate value of the steel bridge or the like from the linear file. FIG. 4 is a basic condition input screen, that is, a screen for inputting linear data displayed on the display. If a linear data file is prepared as in this example, reading from the file is performed. In addition to the basic conditions, an analysis type, a truss structure, and a main girder type are set. In order to set the analysis type to a planar structure (2D) model, zero is input as the Z coordinate batch correction amount.
[0023]
Next, FIG. 5 is a view showing a screen showing an input screen for designating the main digit name and the horizontal digit name on the display. Here, an operation for associating the previously input line name with the main and horizontal digits is performed. First, in the case of the main digit, the line name of the vertical line of the previously input linear data is displayed in the linear column. Then, for example, by clicking G1 and then clicking the arrow “→”, the line G1 is registered as the main digit in the input main digit column. By performing this similarly for the lines G2 to G8, the lines G1 to G8 constituting the framework of the steel bridge are registered as main girders.
[0024]
On the other hand, the line name of the crossing line among the previously input linear data is displayed in the linear column in the same manner in the case of the horizontal beam. Then, for example, by clicking the line S1 and then clicking the arrow “→”, the line S1 is registered as a horizontal digit in the input horizontal digit column. By performing this similarly for the line S2 and the lines C1 to C10, the lines S1 and S2 and the lines C1 to C10 constituting the framework of the steel bridge are registered as horizontal beams.
[0025]
In the case of horizontal beams, the horizontal beams of the line names C3, P1, and C8 are distributed horizontal beams as shown in the right half of FIG. 3, and the other horizontal beams S1, C1,. It is a cross beam of a truss structure as shown. For this reason, the cross beams of other truss structures are sufficiently less rigid than the highly rigid distributed cross beams in which the main beams are connected by plate-like members. .
As a result of the above input operation, a model is created for the frame structure of a steel bridge composed of main girders and horizontal girders with line names as shown in FIG.
[0026]
Next, the cross section constants and materials of the main girder and cross girder elements are entered. This input is performed from the input screen shown in FIG. Here, FIG. 8 is a diagram showing a part of the framework structure model.
Therefore, for example, when input is performed for the main digit element 11, each of "main digit / horizontal digit", "horizontal digit / main digit start", and "horizontal digit / main digit end" is entered in the input field (1) shown in FIG. The line name (G1, S1, C1) is input in the column, and the main digit element 11 is specified. Therefore, the designer specifies the main girder and cross girder elements to be input with reference to the line name, and inputs the area, stiffness Iy, and stiffness Iz, respectively.
[0027]
Then, after inputting the cross-sectional constant of each element, the load is further input. The load, the floor plate, such as by a surface load pavement and haunch, curbs or separation zone, line load due additives, and joint loads and live loads are entered like further dead load sensitive. For example, when a nodal load is applied to the grade 21 shown in FIG. 8, the grade 21 is specified by the line names of the horizontal and main digits in the input field (23) shown in FIG. Therefore, the designer specifies the grade to be input with reference to the line name, and inputs the load respectively.
[0028]
By inputting various loads in this manner, structural analysis is performed according to the modeled framework structure by computer processing. Then, for example, a structural analysis calculation sheet as shown in FIG. 9 is output. FIG. 9 is a diagram showing a part of the structural analysis calculation sheet, which is output corresponding to the line name as in the case of data input. For example, the element name “G1-S1 & G1-C1” is an element 11 that connects the grades 21, 22 specified by “G1-S1” and “G1-C1” as shown in FIG.
[0029]
As described above, according to the structure analysis program of the present embodiment, the main character name and horizontal character name such as G1, S1, C1,. When performing load input, etc., or reading output data, it is very easy for the designer to grasp the score and the position of the member element, and handling becomes very easy.
[0030]
In other words, in the past, the designer had to arbitrarily assign a grade number and check the position of input and output according to the number, so it was difficult to grasp the point from the whole, so input mistakes etc. also occurred It was easy. However, in this embodiment, it is possible to grasp from the entire model by vertical and horizontal lines instead of points, and since the line name is familiar to the designer, it is very easy to narrow down the position and position of member elements from there. It became easy to understand.
[0031]
In addition, when a main digit or a horizontal girder is added, a grading number must be added, which makes it difficult for the designer to grasp the grading position. Since it is only added, it becomes easy to add grades and members, and since the grade is grasped based on the added main girder and horizontal girder lines instead of numbers, there are input mistakes etc. in the input after addition I became difficult to get up.
[0032]
In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning.
[0033]
The present invention is for modeling a framework structure of a steel bridge having a main girder and a cross girder, inputting predetermined data based on the model, and executing structural analysis on hardware. Define the longitudinal and transverse lines of the steel bridge by assigning line names to the upper line, and the grades at the positions where each line intersects, the member elements between the grades, and the position or range of action of the load by line name By specifying, data can be input and output, and it is possible to provide a structural analysis program that makes it easy for a designer to input data.
[Brief description of the drawings]
FIG. 1 is a plan view showing a steel bridge.
FIG. 2 is a side view showing a steel bridge.
FIG. 3 is a cross-sectional view showing a steel bridge.
FIG. 4 is a screen for inputting linear data in one embodiment of a structural analysis program.
FIG. 5 is an input screen for specifying a main digit name and a horizontal digit name in an embodiment of a structural analysis program.
FIG. 6 is an input screen for cross-sectional constants and materials of main girder and cross beam elements in an embodiment of a structural analysis program.
FIG. 7 is a load input screen in one embodiment of the structural analysis program.
FIG. 8 is a diagram showing a part of a framework structure model.
FIG. 9 is output data in one embodiment of a structural analysis program.
FIG. 10 is an input screen for coordinates (X, Y) and loading conditions displayed on a display in a conventional structural analysis program.
FIG. 11 is an element input screen displayed on a display in a conventional structural analysis program.
FIG. 12 is a load input screen displayed on a display in a conventional structural analysis program.
FIG. 13 is a structural analysis calculation document by a conventional structural analysis program.
FIG. 14 is a view showing a flowchart of steel bridge design.
[Explanation of symbols]
1 Steel Bridge 2 Roadway 3 Sidewalk 4 Reinforced Concrete Floor Board 5 Asphalt Pavement G1-G8 Main Girder S1, S2, C1-C10 Horizontal Girder

Claims (3)

In the structural analysis program for modeling the framework structure of a steel bridge with main girder and cross girder, inputting predetermined data based on the model and executing structural analysis on hardware,
Define the longitudinal and transverse lines of steel bridges by assigning line names to the lines on the linear calculation, and indicate the grades at the positions where each line intersects, the member elements between the grades, and the position or range of action of the load. A structural analysis program characterized in that data is input and output by specifying a name. In the structural analysis program according to claim 1,
A line name corresponding to a main digit and a horizontal digit is registered as a main digit or a horizontal digit from the longitudinal line and the transverse line, and data is input and output according to the line name. Structural analysis program. In the structural analysis program according to claim 2,
By loading into the hardware, the frame structure model with the main and horizontal girders with line names on the display and the data input unit are displayed on the screen, and the predetermined data is input to the displayed screen. A structural analysis program characterized by being developed.

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