TIMBER Pro - Dlubal Software

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7 General Functions 7.2 Cross-section Optimization As mentioned in chapter 2.3, TIMBER Pro offers you the possibility to optimize crosssections. Select the relevant cross-section by ticking its check box in column C or D in table 1.3 Cross-sections (see Figure 2.10, page 17). You can also start the cross-section optimization out of the results tables by using the context menu. During the optimization process, TIMBER Pro determines the cross-section within the same cross-section table that fulfills the analysis requirements in the most optimal way, that means comes as close as possible to the maximum possible ratio specified in the Details dialog box (see Figure 3.5, page 33). The required cross-section properties will be determined with the RSTAB internal forces. If another cross-section proves to be more favorable, it will be used for the design. In this case, two cross-sections will be displayed on the right of table 1.3 as shown in Figure 7.6, the original cross-section from RSTAB and the optimized one. A dialog box with detailed specifications appears when you tick the check box for optimization. Figure 7.5: Dialog box Solid Sections - Rectangle : Optimize By ticking the check boxes in the Optimize column, you decide which parameter(s) you want to modify. The ticked check box enables the Minimal and Maximal columns where you specify the upper and lower limits of the parameter. The Increment column determines the interval in which the size of this parameter varies during the optimization process. If you want to Keep Current Side Proportions, tick the corresponding check box. In addition, you have to select both parameters for the optimization. Please note for the optimization process that the internal forces won't be recalculated automatically with the changed cross-sections. It is up to you to decide which cross-sections should be transferred to RSTAB for a recalculation. As a result of optimized cross-sections, internal forces may vary considerably because of the changed stiffnesses in the structural system. Therefore, it is recommended to recalculate the internal forces after the first optimization and then to optimize the cross-sections again. You do not need to transfer the modified cross-sections to RSTAB manually: Set table 1.3 Cross-sections, and then select Export All Cross-sections to RSTAB on the Edit menu. 56 Program TIMBER Pro © 2011 Ing. Software Dlubal
7 General Functions Also the context menu available in table 1.3 provides options to export optimized crosssections to RSTAB. Figure 7.6: Context menu in table 1.3 Cross-sections Before the changed cross-sections are transferred to RSTAB, a security query appears because the transfer requires the deletion of results. When you confirm the query and start the [Calculation] in TIMBER Pro, the RSTAB internal forces as well as the TIMBER Pro designs will be determined and performed in one single calculation run. Figure 7.7: Query before transfer of modified cross-sections to RSTAB By using the menu functions described above, you can also reimport the original RSTAB cross-sections to TIMBER Pro. Please note that this option is only available in table 1.3 Cross-sections. If you optimize a tapered member, the program modifies the member's start and end and interpolates the second moments of area for the intermediate locations linearly. As these moments are considered with the fourth power, the designs may be inaccurate if the depths of the start and end cross-section differ considerably. In this case, it is recommended to divide the taper into several single members whose start and end cross-sections have minor cross-section differences. Program TIMBER Pro © 2011 Ing. Software Dlubal 57
Page 1:
Version September 2011 Add-on Modul
Page 4 and 5:
1 Introduction 1. Introduction 1.1
Page 6 and 7: 1 Introduction 1.4 Open the Add-on
Page 8 and 9: 2 Input Data 2. Input Data The desi
Page 10 and 11: 2 Input Data A multiple selection o
Page 12 and 13: 2 Input Data 2.1.3 Fire Resistance
Page 14 and 15: 2 Input Data Other Settings In the
Page 16 and 17: 2 Input Data Material Properties Th
Page 18 and 19: 2 Input Data Figure 2.11: Dialog bo
Page 20 and 21: 2 Input Data 2.4 Load Duration and
Page 22 and 23: 2 Input Data 2.5 Effective Lengths
Page 24 and 25: 2 Input Data Figure 2.17: Selecting
Page 26 and 27: 2 Input Data 2.7 Tapered Members Th
Page 28 and 29: 2 Input Data Beam Type The beam typ
Page 30 and 31: 3 Calculation 3. Calculation 3.1 De
Page 32 and 33: 3 Calculation 3.1.3 Serviceability
Page 34 and 35: 3 Calculation 3.2 Start Calculation
Page 36 and 37: 4 Results 4. Results Table 2.1 Desi
Page 38 and 39: 4 Results 4.2 Design by Cross-secti
Page 40 and 41: 4 Results 4.5 Design by x-Location
Page 42 and 43: 4 Results 4.7 Governing Internal Fo
Page 44 and 45: 4 Results Surface Area The program
Page 46 and 47: 5 Results Evaluation 5.1 Results in
Page 48 and 49: 5 Results Evaluation In the Factors
Page 50 and 51: 5 Results Evaluation 5.3 Filter for
Page 52 and 53: 6 Printout 6. Printout 6.1 Printout
Page 54 and 55: 7 General Functions 7. General Func
Page 58 and 59: 7 General Functions 7.3 Material Ex
Page 60 and 61: 7 General Functions Excel / OpenOff
Page 62 and 63: 8 Example 8.2 Calculation with RSTA
Page 64 and 65: 8 Example Figure 8.5: Table 1.3 Cro
Page 66 and 67: 8 Example The Details displayed in
Page 68 and 69: 8 Example We do not modify the refe
Page 70 and 71: A Literature A Literature [1] DIN 1
Page 72: B Index Load case .................
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