prestress

简明释义

英[priːˈstres]美[priˈstres]

v. 给……预加应力；给（混凝土构件）装上有预应力的加固丝

n. 预应力；预加应力的过程；预先拉伸

英英释义

单词用法

同义词

反义词

例句

1.For some problem in the construction of prestress beam slab, the paper analyzed and discussed its cause, and proposed protective measures and methods.

针对预应力梁板施工中较常遇到的一些问题，对其产生的原因进行了较为详细的分析与探讨，并提出了具体的预防措施和救治方法。

2.External prestressing is a kind of no felt prestress.

体外预应力是无粘结预应力的一种。

3.The basic formulas, which can determine the ratio of each hoop cable's prestress, are derived.

推导了环索预应力设定的基本公式，由此可确定各圈环索预应力的比值。

4.The relationship between frequency and prestress, ratio of rise to span of tensioned cable and membrane structure are also studied.

系统分析了索膜结构自振特性与预应力、矢跨比、索初始应力等的关系。

5.In order to ensure tensile strength of prestressed member, the controlling prestress loss in construction is a key.

为保证预应力构件的抗拉强度，对于预应力损失的控制是预应力施工中的关键。

6.Spatial cable truss structures are composed of orthogonal prestressed cable trusses which combines prestress technology with space grid structures.

索网架结构将预应力技术与网架技术融为一体，由正交正放预应力索桁架组成。

7.The objective of the research is to reduce the beam's depth by bi prestress in order to save money and beautify landscape.

双预应力梁桥的研究就是试图通过双预应力体系降低梁高，从而达到节省造价，美化景观等目的。

8.The engineers decided to use prestress in the concrete beams to improve their load-bearing capacity.

工程师们决定在混凝土梁中使用预应力以提高其承载能力。

9.The use of prestress technology has become common in modern construction projects.

在现代建筑项目中，使用预应力技术已变得很常见。

10.To enhance durability, the team incorporated prestress into the design of the parking garage.

为了增强耐久性，团队在停车场的设计中融入了预应力。

11.The prestress cables were installed before pouring the concrete to ensure proper tension.

在浇筑混凝土之前，预应力电缆已被安装以确保适当的张力。

12.By applying prestress, the bridge was able to withstand greater forces without deformation.

通过施加预应力，这座桥能够承受更大的力而不发生变形。

作文

In the field of civil engineering, the concept of prestress is crucial for enhancing the performance and durability of structures. Prestress refers to the technique of introducing internal stresses into a concrete element before it is subjected to external loads. This process is essential because it allows the concrete to better withstand tensile forces that would otherwise lead to cracking and structural failure. By applying prestress, engineers can design lighter and more efficient structures, ultimately saving materials and costs while improving safety.The principle behind prestress is relatively simple. It involves the use of high-strength steel tendons that are tensioned before the concrete is cast. Once the concrete hardens, the tension in the tendons is released, creating a compressive force within the concrete. This compressive force counteracts the tensile forces that occur during the service life of the structure, effectively allowing the concrete to perform better under load.There are two main methods of applying prestress: pre-tensioning and post-tensioning. In pre-tensioning, the steel tendons are stretched before the concrete is poured. After the concrete has cured, the tendons are cut, and the resulting compressive force is transferred to the concrete. This method is commonly used in precast concrete elements, such as beams and slabs. On the other hand, post-tensioning involves placing the tendons within ducts in the concrete and tensioning them after the concrete has hardened. This method is often used in cast-in-place construction, where flexibility in design and adjustments on-site are required.The advantages of prestress are numerous. Firstly, it significantly increases the load-carrying capacity of concrete elements, allowing for longer spans without the need for additional supports. This is particularly beneficial in bridge construction and large commercial buildings, where open spaces are desirable. Secondly, prestress reduces deflection and minimizes cracking, leading to a longer service life for structures. Additionally, the use of prestress can result in thinner slabs and smaller beams, which contributes to a reduction in the overall weight of the structure.However, the implementation of prestress also comes with its challenges. The initial cost of materials and specialized labor can be higher compared to conventional reinforced concrete. Moreover, the design and analysis of prestress systems require a deeper understanding of structural behavior and careful attention to detail. Engineers must ensure that the prestress is adequately applied and that the system remains effective throughout the life of the structure.In conclusion, prestress is an innovative technique that has revolutionized the field of civil engineering. Its ability to enhance the strength and durability of concrete structures makes it an invaluable tool for engineers. As the demand for more efficient and sustainable construction methods continues to grow, the role of prestress will undoubtedly become even more significant in shaping the future of infrastructure development. Understanding and mastering the principles of prestress will empower engineers to create safer, more resilient, and aesthetically pleasing structures that meet the needs of society today and in the future.

在土木工程领域，预应力的概念对增强结构的性能和耐久性至关重要。预应力是指在混凝土构件受到外部荷载之前，引入内部应力的技术。这个过程是必要的，因为它使混凝土能够更好地承受拉伸力，否则会导致开裂和结构失效。通过施加预应力，工程师可以设计出更轻、更高效的结构，从而节省材料和成本，同时提高安全性。预应力的原理相对简单。它涉及使用高强度钢筋，在浇筑混凝土之前进行拉伸。一旦混凝土硬化，钢筋上的张力就会释放，产生混凝土内部的压缩力。这种压缩力抵消了在结构使用寿命内发生的拉伸力，有效地允许混凝土在荷载下表现得更好。施加预应力有两种主要方法：预拉和后张。在预拉法中，钢筋在混凝土浇筑之前被拉伸。混凝土固化后，切断钢筋，产生的压缩力转移到混凝土上。此方法常用于预制混凝土构件，如梁和板。而后张法则是在混凝土内的管道中放置钢筋，并在混凝土硬化后进行拉伸。这种方法通常用于现浇施工，需要在现场进行设计灵活性和调整。预应力的优点是众多的。首先，它显著增加了混凝土构件的承载能力，允许在没有额外支撑的情况下实现更长的跨距。这在桥梁建设和大型商业建筑中尤为有利，因为开放空间是理想的。其次，预应力减少了挠度并最小化了开裂，从而延长了结构的使用寿命。此外，使用预应力可以导致更薄的板和更小的梁，这有助于减少结构的整体重量。然而，实施预应力也面临挑战。材料和专业劳动力的初始成本可能高于传统的钢筋混凝土。此外，预应力系统的设计和分析需要更深入的结构行为理解和细致的关注。工程师必须确保预应力得到适当施加，并且系统在结构的整个生命周期内保持有效。总之，预应力是一种创新技术，彻底改变了土木工程领域。其增强混凝土结构强度和耐久性的能力使其成为工程师不可或缺的工具。随着对更高效和可持续的建筑方法的需求不断增长，预应力在塑造基础设施发展的未来中的作用无疑将变得更加重要。理解和掌握预应力的原理将使工程师能够创建更安全、更具韧性和美观的结构，以满足当今和未来社会的需求。