預力混凝土橋梁自動化設計繪圖系統(AutoDes_PC)之開發

預力混凝土橋梁是目前國內既有橋梁中佔有最高比例之橋梁型式，設計時須考慮預力鋼腱施力順序與預力鋼腱斷面之配置等，工程設計圖內容繁瑣，若要以人工藉由AutoCAD完成繪圖作業，將耗費不少繪圖工時，且容易產生錯誤。早期受限於電腦分析能力，工程界常以成束鋼腱形心(CGS)位置，採用連續二次拋物線或高次方程式進行結構分析與設計。目前商用結構分析軟體相當進步，已能按預力鋼腱實際配置狀況進行模擬分析，但如何正確快速建立實際鋼腱位置之座標，則頗不容易，若能開發輔助程式，快速取得鋼腱資訊，以文字檔格式，匯入結構分析軟體，將可得到較精準分析結果。 AutoCAD是目前廣為工程界所採用之工程繪圖軟體，目前大多由使用者以人工方式進行指令操作，或者利用少量VBA工具程式簡化繪圖作業，一旦工程數量多、工作量體大時，則容易產生人為上的疏失，造成誤植或繪製錯誤的情形發生。有鑑於此，本論文將開發預力混凝土橋梁輔助繪圖系統，撰寫Visual Studio C#程式語言，控制AutoCAD指令繪圖，建構視窗化平台，銜接既有結構分析軟體Midas Civil，串聯分析結果逕行設計圖之繪製作業，達到設計自動化繪圖之目的，冀能節省繁瑣的繪圖時間，加速作業流程提高工作效率。

關鍵字

視窗化平台； AutoCAD ； Visual Studio C#

並列摘要

Prestressed concrete (PC) is the most popular superstructure of bridges in Taiwan. Some fundamental points in design of which including the layout and prestressing force of tendons, configuration of girder cross-section, time dependent effect of creep and shrinkage, and the construction method, etc. should be displayed in the engineering drawing. The efforts on man-made drawing are not only significant time-consuming but also inevitable mistaking. This thesis intends to develop an automatic design and drawing system to complete the tedious works of drawing making for PC bridges. In this thesis, the Visual Studio C# programming language is employed to control the AutoCAD in building Window-based platform and connect software Midas Civil for developing the automatic design and drawing system of PC bridges. In the developed system, the process of tendon-prestressing in each construction stage is able to be well defined and the complex geometric information of all the tendons in three dimension space can be established and displayed accordingly. The center of gravity of strands (C.G.S.) for the adopted tendons calculated is used to check the consistency with those of structural model. The accuracy of structural analysis can be recheck and performed again in case that the inconsistency has been found. Besides, the resulting automatic drawing successfully shows the details of all the specific cross-sections of PC girders as well. The results obtained could benefit the engineers a more rapid and efficient tool in PC bridge design.