土木工程专业论文--3×20m预应力连续组合箱梁桥设计.doc

摘要
预应力连续组合箱梁桥设计的内容主要包括荷载和极限设计,其一般设计步骤是先进行结构布置,选取适当的力学模型。根据工程的具体情况,选择合适的桥梁高跨比,初步选定构件的截面尺寸,并进行内力与组合效应的计算。主要根据杆件的弯矩分布图形确定预应力筋的索形,并按经验用预应力度法或平衡荷载法初步估算出所需要的预应力筋根数。
本次毕业设计是一座3×20m预应力连续组合箱梁桥设计,包括上部结构设计和下部结构设计两部分。
本设计课题类型为模拟类型,主要目的是让我们掌握桥梁设计的计算和计算软件的应用,掌握桥梁的绘图和CAD绘图软件。
本设计上部结构是在严格按照规范要求的基础上进行电算,初步拟定上部箱梁的尺寸,进行内力计算及组合,配置预应力钢束及普通钢筋,构件变形及应力验算,由桥梁博士导出各计算结果,并绘制上部结构图纸。下部结构完全采用桥梁通软件进行计算及绘图。
关键词:内力组合、配筋、验算
Abstract
Prestressed posite box girder bridge design covers the load and ultimate design, general design procedure is first of its structural layout, select the appropriate mechanical model. According to the specific circumstances of projects, select the appropriate bridge span ratio, the initial selection ponents of the section size, and for the calculation of internal forces bined effects. Moment based mainly on the distribution bar graph form to determine the tendon cable, according to degree of experience of pre-stressed balance method or the initial load method to estimate the required number of roots tendons.
The graduation project is a 3 × 20m prestressed posite box girder bridge design, including the structural design of the upper and the lower part of the structural design of two parts.
This type of design is simulate to the type of issue, the main purpose is to allow us to get hold of the calculation of bridge design and calculation software applications, master the bridge drawing technology and CAD drawing graphics software.
The design of the upper structure is in strict accordance with the specifications pleted puter, setting the initial formulation of the size of the upper box position to calculate internal forces, configuration prestressed and ordinary reinforced steel beam, deformation and ponents checked, and then get the result from the bridge Dr. software, and drawing the upper part of the structure of the drawings. the lower part of the structure of the bridge use bridge software to calculate and drawings.
Key words: combination of internal forces