------------------------------------------------------------------------------- ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- FLAC 5.00 Modification List (Type PRINT VERSION to check version number.) Changes listed are included in FLACV_SP.EXE (and FLACV_SP_NET.EXE) and FLACV_DP.EXE (and FLACV_DP_NET.EXE). Sub-Version Date Description Number 346 05/05/05 Version 5.0 released to users on Itasca CD 16A. ******************************************************************************* 347 05/24/05 Modify startup message when maxgiicmem cannot be loaded (see SET MAXGIICMEM command.) Correct problem with monitoring histories of model properties. Property was not being recorded. 348 06/15/05 Correction to hysteretic damping logic for single- precision version. Shear strain was not accumulated properly for modulus degradation. 349 06/24/05 Correction to allow printout of cable pretension before cycling. Fix a problem related to creating hysteretic damping objects in the free-field. Correction to print out of damping model information with the PRINT DY_DAMP COMMAND 350 07/11/05 Fix a problem related to saving/restoring hysteretic damping objects in the free-field. Allow user-control of SRATIO for SOLVE FOS mode. 351 07/15/05 New development of Two-Phase flow model to work in axisymmetry configuration [Only one way (fluid-to-mechanical) coupling for now.] 352 07/29/05 Correction on structure element deletion logic to avoid memory leakage. Correction on APPLY stress logic to allow apply two stresses (e.g., sxx and sxy, or sxy and syy) with different histories (or history tables) 353 08/17/05 Correction to clear both Aside and Bside memory block when using INTERFACE REMOVE. Added SET DOSWINDOW ON/OFF to control FLAC console plotting when in GIIC mode. Version 5.00.353 released to users on Itasca CD 17A. ******************************************************************************* 354 09/02/05 Correction to INITIAL DY_DAMP/ST_DAMP command when assigning Rayleigh, local or combined damping to different gridpoints in the model. 355 09/09/05 Correction to hysteretic damping logic for single- precision version. Shear strain was not accumulated properly for modulus degradation at free-field boundaries. Version 5.00.355 released to users on Itasca CD 18A. ******************************************************************************* 356 11/28/05 Property scaling is applied to the transversely isotropic model to resolve precision errors. Correction to FISH function 'CLOCK' to change precision to one-hundredth seconds. Correction to scale coupling spring normal and shear forces to account for spacing. Modified scale for structural element bar plots (such as axial force and moment plots) to change scale to 1/20th of the current plot window. Added optional keyword FIXSCALE to fix the scale at 1/20th of the full model window. Added SET FOS_STEP command to allow increasing the maximum limit for the characteristic response time used in the factor-of-safety calculation. Modification to Hoek-Brown model to bring a stress state back to the yield surface if the initial stresses are outside the yield surface. Viscous stresses are set to regular stresses if any viscous calculation is inhibited during yielding. (Viscous stresses could be undefined if some, but not all, sub-zones are yielding.) SOLVE ELASTIC can now be applied to models containing elastic material as well as Mohr-Coulomb and/or ubiquitous-joint material. Default value for calwidth of strip elemeents set to 1.0. Return error message if node number is invalid when plotting structural strip nodes. 357 12/12/05 Correction to structural element geometry plot for plotting original position (magnification = 0) in large strain mode. Modification to structural element history plots to account for spacing. Correction to pre-tensioning cables (in STRUCT CABLE TENSION command) to account for spacing. Modification to access acceleration histories of structural nodes. (HISTORY NODE XACC, YACC and AACC) Correction to stress trajectory plotting (PLOT ISOMAX and ISOMIN). Previously the labels were not consistent with the plots. 358 01/18/06 Modified stress trajectory plots (PLOT ISOMAX/ISOMIN INTERVAL v) to identify stress magnitude by color. The keyword INTERVAL controls the color interval along the stress trajectory. Added TABLE n READ command to read tabulated data from a file. The file format is: line 1: title, line 2: number of entries in table, line 3: x, y pair of data Modification to structural nodal history (shear and normal forces) and printing (Load_x and Load_y) to account for spacing. Additional correction to structural element geometry plot for plotting original position (magnification = 0) in large strain mode. 359 01/19/06 Modified structural element deletion logic to fix problem with duplicate element ID numbers. Modification to structural element plotting to correct plot window hanging problem. 360 02/06/06 Added FISH access to hysteretic damping variables with new FISH zone varible z_hyst(i,j,'vname') where 'vname' is : 'modfac' - modulus reduction factor, 'e1' - shear strain measure, e1, 'e2' - shear strain measure, e2 See page 3-47 in FLAC Optional Features. Added PRINT / PLOT XACC and YACC for dynamic analysis. Modification to hysteretic damping model to prevent immediate detection of strain reversal. This was causing spurious hysteresis loops. Note that Example Applications 15 and 18 are modified to adjust for this change in the hysteretic damping. Linked thermal-mechanical coupling logic for Hoek-Brown and FINN models. Modified PLOT STRUCT MATERIAL to prevent plotting structural geometry twice. 361 04/24/06 Correction to plastic hinge logic for the case of cyclic lateral loading/unloading. Note that this required a modification to Example 1.22 in Section 1.5.4.3 of the Structural Elements volume. STR.FIN file updated: spare node offsets 2 - 6 now used to store initial positions and accelerations. Modification to strip element model to correct material property assignment when other structural element types exist with strip elements. Modification to FISH intrinsic function, mat_transpose. Function now works for floating-point variables as well as integers. Added PLOT STRUCTURE LOAD command to plot force vector at structural nodes. 362 05/23/06 Deleted hysteretic object and reclaimed memory in 'model null' command, set hysteretic damping pointor to zero for null zones when restoring save files. Corrected structural element number counting logic in structural plotting, which otherwise may cause communication problem between FLAC and GIIC. Extended structural element and node ID printout format from 'I3' to 'I5'. Fixed a random local pointer problem in structural element module that may crash the code. 363 07/12/06 Modified STRIP element model so that interaction with grid in the direction nornal to the strip is the same as that for cable elements. This results in an improved efficiently for both static and dynamic analysis. Corrected printout for structural node information (PRINT STRUCT NODE INFO) and added pretension value to PRINT CABLE printout. Corrected slight asymmetric error when APPLY XQUIET or YQUIET and APPLY FF are applied to the same corner gridpoints. 364 07/19/06 Modification to bypass hysteretic damping strain accumulation during plastic yielding in a zone. This modification affects the results of Example Applications 15 and 18 somewhat. For details on the modification and revised results for these two examples, see the FLAC Examples & Documentation page on the web site. (http://www.hcitasca.com/flac_examples.html#hd) Added pre-tension value to printout for cable information. 365 10/10/06 Modification to out-of-balance flow calculation for undrained conditions. Fluid volume was not accumulating properly when saturation reached 1. This caused a problem particularly in dynamic analysis for partially saturated materials under undrained conditions. 366 11/06/06 Correction for argument assignment error when using ASIN or ACOS intrinsic function in double-precision version. Modification to turn off AUTO flag automatically when flow is turned off in CONFIG GW mode. Added GPP keyword in PROFILE plotting. 367 11/30/06 Correction for group scanning error when using Z_GROUP FISH access. Error occurred if zones scanned did not have a group name. Correction for model checking error when using Z_MODEL FISH access. Error occurred if zones scanned were not Finn model, Hoek-Brown model or CPP-UDM model. Modification to remove "$sol_el$.tmp" file when interrupting SOLVE ELASTIC mode . Correction for legend color in HISTORY/TABLE plot. Version 5.00.367 released to users on Itasca CD 19A. ******************************************************************************* 368 01/22/07 Fixed a bug related to TABLE ERASE command. Allowed convection and radiation boundary conditions applied along the same boundary. Correction on HISTORY SSI/SSR calculation for the zones with fixed gridpoints. 369 02/05/07 Fixed a variable initialization bug in FINN model. Issued an error message when MULTI-STEPPING and HYSTERETIC DAMPING are applied in the same time. Multi-stepping logic does not recognize changes to the elastic moduli resulting from hysteretic damping. 370 02/09/07 Removed the error message when MULTI-STEPPING and HYSTERETIC DAMPING (HD) are applied in the same time. Note that high frequency events may be missed by the HD logic if multistepping is active. The user is advised to run the model with and without MULTI-STEPPING to check on the magnitude of the effect. 371 03/01/07 Corrected displacment accumulation for the gridpoint ATTACHing to itself. 372 04/10/07 Extended SET GEOM to work in all calculation modes. corrected the startup screen printout information on DP student version. 373 07/20/07 Corrected tension cutoff at apex for HoekBrown model Set viscous flag for ANISOTROPIC ELASTIC and CREEP (VISCOUS, POWER, CWIPP, PWIPP) built-in models; and, several FISH (ANISOTROPIC, ELASTIC, HOEKBROWN and DUNCAN) models, if there is no plastic flow, so that Rayleigh stiffness damping or hysteretic damping (if active) will not be inhibited in dynamic analysis. Fixed a bug that PLOT APPLY would adjust total stresses if ATS (Adjust Total Stress) flag is active. 374 07/20/07 Fixed a bug in INITIAL command. Without this change, APPLY FF would be affected if an INITIAL command is issued in front of it. Fixed a bug in FIX command. Without this change, the FIX command would also fix structural nodes located in the neighboring zones of fixed gridpoints in some cases. 376 10/24/07 Corrected SET OVERWRITE command. Also, corrected the problem in which existing EPS files were being overwritten even though SET OVERWRITE OFF is given. 376 10/24/07 Corrected SET OVERWRITE command. Also, corrected the problem in which existing EPS files were being overwritten even though SET OVERWRITE OFF is given. 377 01/24/07 Changed student version to demo version. (Student version users need to rename flacs.cfg to flacdemo.cfg.) Modification to reset the factor for determining stress equilibrium in the NEW command. The factor is used to check for stress equilibrium when SOLVE is issued.