First of all, to determine the main structure of the main girder and the detail size, must be consistent with the provisions of the bridge and construction, considering the effect of bending stiffness and torsional stiffness, the design of hollow slab beam. Secondly, the structural design principle is used to solve the internal force of the structure (including the calculation of the internal forces of the transverse load and live load). Used to calculate the internal force combination results to estimate the number of longitudinal prestressing tendons, and then arrange the prestressed steel wire bundle. Thirdly, the prestress loss is calculated, and then the cross-section strength is checked, including the limit state of bearing capacity and serviceability limit state. The calculation of normal stress of concrete, including the calculation of the section stress, the checking of the tensile stress in the prestressed steel and the calculation of the principal stress of the section. Must be checked through a number of times in order to get the desired results, after several times to adjust the number of the number of the number of bundles of steel beams and the number of ordinary steel bars, and ultimately make the structural safety check qualified. Finally, through the AUTOCAD drawing of the bridge construction drawings.
The design of the project is 3 x 20m prestressed simply supported hollow slab construction drawings design. The prestressed concrete hollow slab girder bridge is one of the main types of the bridge, which has the advantages of good structural performance, small deformation, less expansion joints, smooth and comfortable driving, small maintenance, and strong seismic resistance. The span of the bridge is 3 x 20m and the bridge width is 18.5m. The calculation process is as follows:
通过毕业设计，实现了对桥梁工程专业知识的梳理，锻炼了专业技能，提高 了综合素质，为进一步学习和工作打下了坚实的基础。
关键词：预应力混凝土、简支梁桥、空心板、内力组合、强度验算、AutoCAD。
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Yixian County Huangshan City wing ran Luqiao design
Abstract
Through the graduation design, the bridge engineering knowledge has been realized, the professional skill has been improved, and the comprehensive quality has
黄山市黟县翼然路桥设计摘要源自本次设计课题为 3×20m 预应力简支空心板桥施工图设计。预应力混凝土空 心板梁桥以结构受力性能好、变形小、伸缩缝少、行车平顺舒适、养护工程量小、 抗震能力强等而成为赋予竞争力的主要桥型之一。设计桥梁跨度为 3×20m，桥 宽 18.5m。计算过程大致如下：
首先，确定主梁主要构造及细部尺寸，必须与桥梁的规定和施工保持一致， 考虑到抗弯刚度及抗扭刚度的影响，设计空心板梁。其次，利用结构设计原理的 知识求解分析结构总的内力（包括横载和活载的内力计算）。用于计算的内力组 合结果从而估算出纵向预应力筋的数目，然后再布置预应力钢丝束。再次计算预 应力损失，然后进一步进行截面强度的验算，其中包括承载能力极限状态和正常 使用极限状态。在正常使用极限状态验算中包括计算截面的混凝土法向应力验算， 预应力钢筋中的拉应力验算、截面的主应力计算。必须通过多次验算才能得到理 想结果，经过多次调节各号钢束的编数根数雨束数以及加配普通钢筋，最终使得 结构安全验算合格。最后，通过 AUTOCAD 绘制了桥梁施工图纸。