中美欧混凝土构件抗剪承载力和预应力损失计算方法对比分析

发布时间：2018-01-26 15:55

本文关键词： 桥梁规范抗剪承载力预应力损失对比　出处：《大连理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：现代公路交通系统中,桥梁占有无可替代的重要地位。近年来,随着我国科技、经济、文化的飞速发展,桥梁设计理论和施工技术也取得了很大进步,但与发达国家相比,仍存在很大差距。了解发达国家的桥梁设计标准,对完善我国公路桥梁混凝土设计规范,提高桥梁建设在国际市场上的竞争力有重要意义,因此本文结合国家基础性项目(973项目)“特大跨桥梁安全性设计与评估的基本理论研究”课题3“多因素作用下特大跨桥梁性能演变特性”(2015CB057703)对我国现行《公路钢筋混凝土及预应力混凝土桥涵设计规范》、美国《AASHTO荷载与抗力系数桥梁设计规范》和欧洲规范《混凝土结构设计第2部分：混凝土桥梁》进行对比分析。具体内容包括：(1)钢筋混凝土和预应力混凝土构件斜截面抗剪承载力计算研究了中国、美国和欧洲规范中无腹筋和有腹筋钢筋混凝土构件和预应力混凝土构件抗剪承载力的计算方法、影响因素、计算位置和构造要求,算了无腹筋板和有腹筋梁的抗剪承载力,比较了3本规范计算结果与试验结果的差异。结果表明：3本规范构件抗剪计算位置的确定有一定差别,采用的计算理论不同,计算中考虑的因素也不同；3本规范计算的构件抗剪承载力与试验结果比值的平均值都小于1,计算都偏于安全；中国规范的最小配箍率未考虑混凝土抗压强度的影响,美国规范和欧洲规范的最小配箍率随混凝土抗压强度的增加而增大；中国、美国和欧洲规范最大抗剪强度都随混凝土强度的增加而增大。(2)预应力混凝土构件预应力损失计算对比了3本规范中有关张拉控制应力、瞬时预应力损失、长期预应力损失和预应力损失组合的规定,计算了后张法预应力混凝土T型梁的预应力损失。结果表明：3本规范均采用分项叠加法计算预应力损失,不同阶段考虑的预应力损失略有不同,计算长期预应力损失的方法差异较大。
[Abstract]:In recent years, with the rapid development of science and technology, economy and culture in China, bridge design theory and construction technology have made great progress. However, compared with the developed countries, there is still a big gap. Understanding the bridge design standards of developed countries is of great significance to improve the concrete design standards of highway bridges in China and enhance the competitiveness of bridge construction in the international market. Therefore, this paper combines with the national basic project "the basic theoretical study of safety design and evaluation of large span bridges" (topic 3, "performance evolution characteristics of extra-large span bridges under the action of multiple factors") (. 2015CB057703) the current "highway reinforced concrete and prestressed concrete bridge and culvert design code". American Code for Design of Bridges with load and Resistance coefficient of AASHTO and European Code for Design of concrete structures part 2: concrete Bridges. The shear capacity of reinforced concrete and prestressed concrete members with oblique section is calculated and studied in China. In American and European codes, the calculation method of shear capacity of reinforced concrete members without and with web reinforcement and prestressed concrete members, the influencing factors, the calculation position and the structural requirements are discussed. The shear bearing capacity of the steel plate without web reinforcement and the beam with web reinforcement is calculated, and the difference between the calculated results of the three codes and the test results is compared. The results show that there are some differences in the determination of the shear calculation position of the components of the three codes. The calculation theory adopted is different, and the factors considered in the calculation are also different. (3) the average value of the ratio of shear capacity to test results calculated in this code is less than 1, and the calculation is more safety. The minimum hoop ratio of Chinese codes does not take into account the influence of concrete compressive strength. The minimum hoop ratio of American Code and European Code increases with the increase of compressive strength of concrete. The maximum shear strength of Chinese, American and European codes increases with the increase of concrete strength. The combination of instantaneous prestress loss, long-term prestress loss and prestress loss. The prestress loss of post-#china_person0# prestressed concrete T-beam is calculated. The results show that the prestress loss is calculated by the method of partial superposition in this code, and the prestress loss is slightly different in different stages. The method of calculating long-term prestress loss is quite different.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU37

【参考文献】