预应力混凝土框架结构计算机辅助设计及绘图系统（PCF）

【作者】 刘丽广；

【导师】 殷福新；

【作者基本信息】 大连理工大学 ， 结构工程， 2002， 硕士

【摘要】 预应力混凝土是当今世界上技术最先进、用途最广、最有发展前途的工程材料之一。由于具有突出的优越性，预应力混凝土和预应力技术在我国得到了迅猛推广和应用，并已经渗透到土木工程的各个领域，在未来还会有飞速的发展和进步。但是，适于工程应用的预应力混凝土结构CAD软件在国内还很少。为此，重点针对国内应用极广泛的低层和多层预应力混凝土框架结构，开发了预应力混凝土框架结构计算机辅助设计及绘图系统(PCF)。 PCF适用于Windows9X／WindowsNT／Windows2000，它采用了当今先进的开发平台Visual C++6.0和先进的计算机技术，包括C／C++Windows编程、MFC基本类库、视图操作、利用内存映射文件在进程之间传输数据、数据库技术、AutoCAD2000二次开发技术ObjectARX等。 PCF按模块化与集成化有机结合的思想进行开发。前处理模块通过对话框采集数据来建模，并利用图形反馈建模结果；计算核心利用考虑了轴向变形的杆系有限元程序计算荷载效应和预应力效应，并按《混凝土结构设计规范》GBJ10—89计算承载能力极限状态和正常使用极限状态；后处理模块通过文本文件和图形显示来完成结果查询，并直接在AutoCAD环境下生成施工图。PCF是集建模、计算、设计、绘图于一体的集成化系统。 本文提出了计算预应力筋数量的“拉应力限制系数法”这一概念，并由之推导了考虑预应力次弯矩的计算公式。PCF采用了该方法，能根据结构的使用性能要求，主动进行抗裂设计，并对不同抗裂等级构件取得了统一的计算方法。更多还原

【Abstract】 As a wide used engineering material, prestressed concrete has been developing very fast, representing one of the latest technologies in civil engineering. It offers the engineers a fabulous tool to solve the problem of designing the wide space structures. However, it is hard for the engineers to find an appropriate software to design the prestressed concrete structures. The author manages to develop a Prestressed Concrete Frame Structure CAD software (PCF) to solve part of this problem.PCF is finished under the popular flat Visual C++6.0, which is applicable to Windows 9X/Windows NT/Windows 2000. The software makes full use of the advanced computer technologies, including C/C++ Windows programming, Microsoft Foundation Classes, transferring data with Mapping files in memory and thread, operating visibility and developing drawing system with Object ARX technology.PCF consists of three parts: preprocess, calculating kernel and post-processing. The data used by calculation program and post-processing are formed by dialog boxes, and fed back by figure. A finite element program which considers the influence of axial deformation can analyze the prestressed concrete frame structure, then the structure is designed according to the code of concrete structure GBJ10-89. Post-processing can give the result of calulation by text file and graph, and plot construction drawings in AutoCAD .The authors provides a new method named Limitation Coefficient of Tension Stress Method, which can calculate the quantity of prestressed tendons, taking the prestressing secondary moment into account. Using this method, PCF can automatically fulfill the requirements of crack-controlling, and unifies the calculating method of the quantity of prestressed tendons under different crack-controlling.更多还原