A variety of factors,such as cable loosen,would make prestressed structures work in error state,which will influence the function of structures.
预应力结构在使用过程中由于索松弛等原因导致结构处于误差状态,影响结构的正常使用。
The phylogeny and the tendency of the prestressed structures are analysed in this paper, and the function and status of prestressed cables are also immulated, the classification performance and state-of arts of prestressed cables are summarized and the importance of the research for linear expansion factor of the cables is proposed in this paper.
分析了预应力结构的发展历史和趋势,阐明了预应力索在现代预应力结构体系中的作用和地位,总结了预应力索的分类、性能及国内外对索的研究现状,提出了索的线性膨胀系数研究的重要性,并对利用拉索对结构施加预应力的主要方法(拉索法和支座位移法)进行了总结分析。
In this paper ths cables in prestressed structures are treated as two-node elements.
本文将预应力结构中的张拉索处理为具有两个铰接节点的索单元,导出了索单元中总分布荷载的表达式和索的大位移增量刚度矩阵以及索元的一致质量矩阵,基于虚功原理建立了索元的静动力非线性平衡方程。
Based on the bond and failure mechanism of the pre-stressed structure and the material parameter depression in the temperature field under fire,this paper analyzed the mechanical behavior of the pre-stressed hollow slab by the non-linear finite element method,and obtained the pre-stressed steel strand stress relaxation under the high temperature.
依据预应力结构的粘结与破坏机理,在火灾温度场下,考虑高温区域内板梁材料参数的降低,采用非线性有限元的方法分析板梁的受力性能,得出高温下预应力钢绞线的应力松弛程度,并在合理假定条件下研究钢绞线随局部失效长度的变化,以及整根钢绞线发生粘结滑移情况,为桥梁的检测评定以及维修加固提供理论依据。
Super-span prestressed structure is designed to reduce the height of the beams.
为减小梁的高度,采用了超长预应力结构,解决了超长结构的温度问题。
This paper discusses principle and method of a static loading test based on total stress quantity of prestressed structure, total stress quantity of prestressed structure is tested under loading during static loading test.
讨论了预应力结构在静载试验过程中 ,通过直接测试在试验荷载作用下试验结构的实际应力全量 ,根据结构允许出现的最大应力全量值 ,确定试验结构的承载能力的应力全量静载试验的原理和方法 。
The article mainly discusses the principle,advantages and construction technology of the vacuum mud-jacking technique,and the gist of the construction control,and probes into the hole mud-jacking technique of post-tensioned prestressed structure of the round tank wall.
该文主要论述了真空压浆技术的原理、优点、施工工艺和施工控制要点,并探讨了圆形池壁后张法预应力结构孔道压浆技术。
It is shown that the dual control of prestress tensioning can attain to high accuracy and efficiency by the prestressed robot, and fulfill the demand of practical application in prestressed concrete structures and has wide engineering background and good applying .
预应力机器人张拉系统可实现预应力张拉的双重控制,保证施工张拉精度在1%的范围内,具有精度高、高效率的特点,满足预应力结构工程应用的要求,具有广阔的工程背景和良好的应用前景。