65.885101008565.8公路连续梁设计(4车道)毕业论文
2022-05-10 20:32:01
论文总字数:26809字
摘 要
ABSTRACT………………………………………………………………………...II
第一章 绪论………………………………………………………………………..1
1.1 桥型介绍……………………………………………………………………...1
1.2 设计特点……………………………………………………………………...1
1.3 受力特点……………………………………………………………………...2
1.4 构造特点……………………………………………………………………...3
1.5 施工方案……………………………………………………………….…..…4
第二章 设计资料…………………………………………………………….……7
2.1 工程概况与背景………………………………………………………...……7
2.2 设计主要技术指标……………………………………………...……………7
2.3主要设计参考规范……………………………………………………………8
第三章 截面拟定及内力计算…………………………………………………10
3.1主跨径的拟定……………………………………………………..…………10
3.2主梁尺寸拟定………………………………………………………..………10
3.3设计主要材料…………………………………………………..……………11
3.4桥梁设计荷载………………………………………………..………………11
3.5主梁内力计算……………………………………………..…………………12
3.6恒载内力计算…………………………………………..……………………12
第四章 预应力筋的设计与布置……………………...………………………19
4.1 钢束估算………………………………………….…………………………19
第五章 预应力损失计算………………….……………………………………23
5.1摩阻损失…………………………………………..…………………………23
5.2锚具变形损失……………………………………..…………………………23
5.3温差损失…………………………………………..…………………………24
5.4分批张拉损失……………………………………..…………………………26
5.5预应力筋松弛损失………………………………..…………………………26
5.6混凝土收缩和徐变损失…………………………………….…………….…26
第六章 承载能力极限状态验算……………………………………………...29
6.1正截面抗弯承载力计算……………………………………………………..29
6.2 斜截面抗剪承载力计算…………………………………………………….32
第七章 正常使用极限状态验算……………………………………………...35
7.1 正截面抗裂性计算………………………………………………………….35
7.2 斜截面抗裂性计算………………………………………………………….36
第八章 持久力状态应力验算…………………………………………………38
8.1 正截面压应力验算………………………………………………………….38
8.2 斜截面主压应力验算……………………………………………………….39
8.3预应力钢束拉应立验算……………………………………………………..40
第九章 变形验算…………………………………………………………...……38
9.1 使用阶段挠度验算………………………………………………………….38
结语………………………………………………………………………………….41
参考文献…………………………………………………………………………...42
致谢………………………………………………………………………………….44
65.8 85 10×100 85 65.8公路连续梁桥
摘 要
二战以来,预应力混凝土连续梁桥由于其跨越能力大、施工方法灵活、适应性强、结构刚度大、抗地震能力强、通车平顺性好以及造型美观等特点,在战后各国得到广泛的应用。
本设计为(65.8 85 10×100 85 65.8m)的预应力混凝土连续梁桥,桥宽2*20m。梁体为双箱单室结构,全桥分为262个单元。由于多跨连续梁桥的受力特点,支点附近承受较大的负弯矩,跨中承受正弯矩,故采用变高度梁,变化趋势为二次抛物线,这样有效的减小了跨中截面的自重,也使造型更为美观。
由于预应力混凝土连续梁桥为超静定结构,手算工作量比较大,所以本次设计采用Midas软件进行设计验算。
关键词:连续梁桥 变高度 双箱单室 全预应力
65.8 85 10×100 85 65.8 Highway Beam Bridge
Abstract
Since world war II, pre-stressed concrete continuous beam bridge spans due to its large capacity, construction methods and flexible , adaptable , structural rigidity , strong anti- seismic capacity , traffic smooth and attractive appearance and good features , more and more widely in the post-war country applications.
This design is (65.8 85 10×100 85 65.8) m pre-stressed concrete continuous beam bridge width 2×20m. Dual beam using separate boxes, full beam is divided into 262 units. Due to the mechanical characteristics of Multi-span continuous girder bridge , bear a greater negative moment near the fulcrum , cross the bear positive moment , so it becomes highly beams, according to parabola changes , which effectively reduces the weight of the cross , reduce the weight of the box beam ,also with attractive appearance.
Due to continuous pre-stressed concrete beam bridge is statically indeterminate structure , hand calculations workload is relatively large, so this design uses Midas software design checking.
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