北京科技大学本科生毕业设计(论文)
摘
要
本文对一个 4×20 米先张法预应力混凝土空心板简支桥进行了设计验算。
文章拟定了桥梁的上部结构尺寸,对荷载内力进行了计算,并且对主要构件进行了
强度承载能力极限状态和正常使用极限状态验算。其中,上部结构尺寸的拟定,主要参
考了桥涵规范及相关范例;利用铰接板法和杠杆原理法求解横向分布系数,并且参考相
关范例对 12 块空心板进行了分组,从而可以查表得出横向分布影响线,进而求得横向
分布系数。
文章对于桥梁中板进行了内力验算,强度验算。考虑到时间和能力的缺欠,只能中
板进行了配筋。但在钢束位置校核及预应力损失估算部分则选择了一块较为安全的板计
算。本结构对于各种验算均满足要求。
在设计验算的过程中,主要参考了《公路桥涵设计通用规范》,《公路钢筋混凝土
及预应力混凝土桥涵设计规范》及《结构设计原理》。
关键词:预应力、混凝土、简支梁、空心板
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北京科技大学本科生毕业设计(论文)
design of a first-tensioned prestressed concrete simply-supported hollow
slab 4×20-meter bridge
Abstract
This paper focuses on the design and checking of a first-tensioned prestressed concrete
simply-supported hollow slab4×120m bridge.
The article prepared by the upper bridge structure size, the stress of the
load
calculation, and the main component of the strength bearing capacity limit state and the
use of normal limit state checked. Within this total, the size of the upper structure of the
formulation, the main reference to the bridge specifications and related practices; use
hinged plate and lever principle method horizontal distribution coefficient, and reference
to relevant examples of hollow plate 12 for the group, which can draw Lookup
horizontal distribution lines, which generates the horizontal distribution coefficient.
. The article for the bridge plate for checking the internal force, strength calculation.
Taking into account time and capacity deficiencies, which can only be a reinforcement plate.
But the steel beam position checking and prestressed estimated losses partly chose a more
secure plate. The structure for the various checking can meet the demands.
Checking the design process, the main reference to the "highway bridge design
common norms," "Highway reinforced concrete and prestressed concrete bridge design
code" and "structural design principle".
Key Words:Prestressed; Concrete; Simply-supported; Hollow Slab
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北京科技大学本科生毕业设计(论文)
目
录
摘
要 .................................................................................................................................. 1
Abstract..................................................................................................................................... 2
1 设计资料及主要指标确定.................................................................................................. 1
1.1 设计资料 .................................................................................................................... 1
1.1.1 桥面跨径及桥宽 ............................................................................................. 1
1.1.2 设计荷载.......................................................................................................... 1
1.1.3 材料及工艺...................................................................................................... 1
1.1.4 设计依据.......................................................................................................... 1
1.2 构造布置 .................................................................................................................... 2
1.2.1 预制板的截面构造及尺寸............................................................................. 2
1.2.2 全桥的横截面构造及尺寸............................................................................. 2
2 板的毛截面几何特性计算.................................................................................................. 2
2.1 预制板的截面几何特性 ........................................................................................... 4
2.2 毛截面几何特性........................................................................................................ 4
2.3 成桥阶段板梁的截面几何特性............................................................................... 5
3 板的内力计算....................................................................................................................... 6
3.1 荷载横向分布系数计算 ........................................................................................... 6
3.1.1 支座处的荷载横向分布系数m
0
的计算...................................................... 6
3.1.2 跨中荷载横向分布系数m
c
的计算 .............................................................. 7
3.1.3 荷载横向分布系数汇总............................................................................... 11
3.2 荷载内力计算.......................................................................................................... 12
3.2.1 恒载内力计算 ............................................................................................... 12
3.2.2 活载内力计算 ............................................................................................... 14
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北京科技大学本科生毕业设计(论文)
3.3 作用效应组合.......................................................................................................... 21
4 预应力钢筋面积的估算及预应力钢筋布置................................................................... 25
4.1 估算预应力钢筋面积.............................................................................................. 25
4.2 预应力钢筋的布置.................................................................................................. 27
4.3 普通钢筋数量的估算及布置................................................................................. 27
5 换算截面几何特性计算.................................................................................................... 30
6 承载能力极限状态计算.................................................................................................... 31
6.1 跨中截面正截面抗弯承载力计算......................................................................... 31
6.2 斜截面抗剪承载力计算 ......................................................................................... 32
6.2.1 截面抗剪强度上、下限复核 ...................................................................... 32
6.2.2 斜截面抗剪承载力计算............................................................................... 35
7 预应力损失计算................................................................................................................. 37
7.1 锚具变形、回缩引起的应力损失�
2l.
................................................................. 37
7.2 加热养护引起的温差损失�
3l.
.............................................................................. 37
7.3 预应力钢绞线由于应力松弛引起的预应力损失�
5l.
......................................... 37
7.4 混凝土弹性压缩引起的预应力损失�
4l.
............................................................. 38
7.5 混凝土收缩、徐变引起的预应力损失�
6l.
......................................................... 38
7.6 预应力损失组合...................................................................................................... 41
8 正常使用极限状态计算.................................................................................................... 42
8.1 正截面抗裂性验算.................................................................................................. 42
参 考 文 献 .......................................................................................................................... 50
附 录 A................................................................................................................................... 52
附 录 B................................................................................................................................... 63
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北京科技大学本科生毕业设计(论文)
Delete
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在 学 取 得 成 果.............................................................................................................. 67
致 谢 ................................................................................................................................ 68
Delete
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