I think that one of the my favourite software regarding bridge analysis, modeling and advanced simulation is Midas Civil. I had good experience in the past using this kind of numerical fem software.

Once you have the results of analysis. RRP explorer developed by Prof. Benny Raphael can be used for optimization. It is a multi criteria objective optimisation algorithm in which you can give priorities and sensitivities .It would give an optimum results. If you could export different results from Staad or SAP and code to get the required results in excel, this algorithm would create a pareto front and help in identifying an optimal solution based on your priorities and sensitivities.

http://bennyraphael.com/RRPX/help.html

Dynardo software & engineering

http://www.dynardo.de/en/software/optislang.html

optiSLang v4

Software for sensitivity analysis, multiobjective and multidiciplinary optimization, robustness evaluation, reliability analysis and Robust Design Optimization

Journal with Application examples for this software:

http://www.dynardo.de/en/library/rdo-journal.html#c7576

Distributors:

http://www.dynardo.de/en/software/distributors.html

Flyer for optiSlang v4:

http://www.dynardo.de/fileadmin/Material_Dynardo/dokumente/broschuere/Brosch_optiSLang4_P_eng_Web.pdf

youtube channel:

http://www.youtube.com/user/DynardoGmbH

connections to various software is available:

ANSYS Workbench nodes

- Batch mode (single solver run AND parallel solver run)

- Write input and output files

- Support of all RSM modes (incl. Save Design Points)

Text Input: Marker, Preview

Text Output: Definition of token separator

Catia input node

Excel Macros, consider slot IBaseDir as base directory of the excel table

Matlab: Search registry button and configuration entry

Sofistik is very good solution for bridge design. A lot of things can be defined in a parametric manner (e.g. cross section dimensions, bridge axis, position of columns, tendon paths, etc.), either by graphical pre-processor or textually by code, so you can change the parameters very quickly and search for the optimal solution. You can even control the software iterativelly by writing your specific code in its input programming language (kind of intuitive). Good luck

Thank u all sir for your kind help

Webinar: optiSLang v4 and ANSYS Workbench

http://www.dynardo.de/en/trainings/webinars/webinar-optislang-v4-and-ansys-workbench.html

Call for Papers:

"12th International Probabilistic Workshop" held in Weimar Germany, on November 4th and 5th 2014"

https://www.researchgate.net/post/Call_for_Papers_12th_International_Probabilistic_Workshop_held_in_Weimar_Germany_on_November_4th_and_5th_2014

Check optimization computing platform (OCP), https://www.aceocp.com/, Article A general purpose real-world structural design optimization ...

Article The environmental and economic impact of structural optimization