en Structure-Concrete Structure- Concrete Research Paper Research Paper <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">In order to lighten the prestressed concrete solid members, nowadays, it is possible to make use of the advantage of HPC (f</font></font></font><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="1"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="1"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="1">c</font></font></font></i><font color="#231f20" face="TimesNewRomanPSMT" lang="ZH-TW" size="2"><font color="#231f20" face="TimesNewRomanPSMT" lang="ZH-TW" size="2"><font color="#231f20" face="TimesNewRomanPSMT" lang="ZH-TW" size="2">&#39</font></font></font><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">>60</font></font></font></i></p> <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">MPa) as well as replacing the solid section with a PSC thin-walled section for certain members such as circular and box columns.</font></font></font></i></p> <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">Using the strength theory of ACI, a numerical procedure along with a computer program was developed for the analysis of such</font></font></font></i></p> <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">sections subjected to axial compression or tension load and bending moments. The program solves for all possible variables such</font></font></font></i></p> <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">as, concrete compressive strength (f</font></font></font><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="1"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="1"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="1">c</font></font></font></i><font color="#231f20" face="TimesNewRomanPSMT" lang="ZH-TW" size="2"><font color="#231f20" face="TimesNewRomanPSMT" lang="ZH-TW" size="2"><font color="#231f20" face="TimesNewRomanPSMT" lang="ZH-TW" size="2">&#39</font></font></font><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">= 60-100 MPa), type of prestressed steel, concrete cover, ratio of wall thickness to the section</font></font></font></i></p> <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">dimensions and the PS steel arrangements to satisfy the given loading cases, thus leading to an optimal cost solution. However,</font></font></font></i></p> <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">since the cross section is thin-walled circular or box and the PS steel is located at discrete points along the periphery of a circle</font></font></font></i></p> <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">or rectangle, the equations of equilibrium are complex for hand computations (especially for circular section) but suitable for</font></font></font></i></p> <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">computer program. So, by use of MATLAB software the interaction diagrams were also drawn for the analysis of such sections</font></font></font></i></p> <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">for all mentioned variables. The use of prestressed thin-walled column diagrams is a safe and easy tool for the analysis of such</font></font></font></i></p> <p align="left"><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">columns. Finally, the accuracy of the proposed method is demonstrated by comparing its results to those of the available</font></font></font></i></p> <p><i><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2"><font color="#231f20" face="TimesNewRomanPS-ItalicMT" lang="JA" size="2">experimental values and is indicate that the proposed method predict very well the capacity of prestressed thin-walled column.</font></font></font></i></p> Analysis, Prestressed HPC, Thin-walled columns, Interaction diagrams 263 273 http://ijce.iust.ac.ir/browse.php?a_code=A-10-94-1&slc_lang=en&sid=1 A. A. Maghsoudi maghsoudi.a.a@mail.uk.ac.ir 180031947532846009789 180031947532846009789 No Associate Professor, Civil Engineering at Kerman University,Kerman, Iran H. Akbarzadeh Bengar h_akbarzadeh_b@yahoo.com 180031947532846009790 180031947532846009790 Yes Assistant Professor, Civil Engineering at University of Mazandaran, Babolsar, Iran