27.5+50+27.5m预应力混凝土单线变高度连续梁桥设计(含CAD图)(计算说明书25000字,CAD图纸10张)
摘要
上世纪以来，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，在国内越来越得到广泛的应用。
本次设计为（27.5+50+27.5)m预应力混凝土连续梁，桥宽为6m。梁体采用单箱，全梁共分210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，按二次抛物线变化，这样有效的减小了跨中自重，还增加了美观效果。分别进行了箱梁自重、二期恒载、汽车作用、温度次内力和支座沉降次内力的计算，接着对上述内力，进行了荷载组合，包括主力和附加力组合。根据效应组合进行了桥跨结构的配筋设计，完成了预应力损失的计算。最后，对结构进行正截面抗弯强度验算、斜截面抗剪强度验算、正截面抗裂和斜截面抗裂验算。上部结构设计与计算完成后，根据支反力的大小，进行了支座设计和下部结构的初步设计。
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 单箱 变高度 预应力
Abstract
Since the last century, prestressed 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 country applications.
This design is (27.5 +50 +27.5) m prestressed concrete continuous beam bridge width 6m. Dual beam using separate boxes, full beam is divided into 210 units. Due to the mechanical characteristics of Multispan 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 , also increased the aesthetic effect . The weight of the box beam , respectively , two dead, car action , internal force calculation of internal forces bearing settling times and temperatures times , then the above-mentioned internal forces carried out load combinations ,the load combination, including the main force and the combination of force. According to the effect combination, the reinforcement design of the bridge structure is carried out, and the calculation of the prestress loss is accomplished.At last, the structure is checked against bending strength, the shear strength of the cross section, the normal section and the anti cracking of the oblique section are checked. After the design and calculation of the upper structure, according to the size of the supporting force, the design of the bearing and the substructure of the substructure are designed.
As the pre-stressed concrete continuous girder bridge is statically indeterminate structure, the manual workload is relatively large, so the design uses Midas software for design and checking.
Keywords: continuous girder bridge, single box, high prestress
目录
第一章 概述 1
1.1预应力混凝土连续梁桥概述 1
1.2设计资料 4
1.3采用材料 4
1.3.1 混凝土 4
1.3.2 钢材 5
1.3.3其他材料 5
1.4桥梁结构计算与分析 6
第二章 方案设计 7
2.1 桥梁截面形式 7
2.1.1桥梁立面 7
2.1.2 主梁截面形式及细部尺寸确定 7
第三章 内力计算与荷载组合 10
3.1 梁单元内力计算 10
3.1.1 主力计算 10
3.1.2 附加力特殊荷载计算 15
3.2 内力组合 17
第四章 预应力钢束的估算和布置 19
4.1计算原则 19
4.2 材料性能参数 19
4.3 预应力钢筋数量的确定及布置 20
4.3.1估算方法 20
4.3.2 截面上缘配置预应力筋情况 21
4.3.3截面下缘配置预应力筋情况 22
4.3.4预应力筋估算 23
第五章 主梁验算 26
5.1截面几何特性 26
5.2 正截面抗弯强度检算 26
5.2.1主梁跨中截面强度检算 28
5.2.2支点截面强度检算 29
5.2.3验算结果表格节选 30
5.3斜截面抗弯强度验算 31
5.3.1计算方法 31
5.4 斜截面抗剪强度验算 32
5.4.1计算方法 32
5.4.2验算结果表格节选 33
5.5 正截面抗裂验算 34
5.5.1计算方法 34
5.5.2验算结果表格节选 34
5.6 斜截面抗裂验算 35
5.6.1计算方法 35
5.6.2验算结果表格节选 37
5.7 应力验算 38
5.7.1计算方法 38
5.7.2验算结果表格节选 38
5.8 变形验算 39
5.8.1梁体竖向挠度 39
5.8.2梁端竖向转角 39
参考文献 40
结束语 41
致谢 42
附录 43
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