结构破坏

Most casing damages in Zhongyuan oilfield take place in the salt bed formations, and this has remained a problem that seriously threatens oil and gas production for long time. Causes of casing damages were investigated, and a series of measures in casing design have been adopted accordingly, but with unsatisfactory results.

中原油田由于地质结构复杂，断层纵横交错，油气埋藏深，又有多套盐膏层覆盖，再加上注采关系不够平衡，导致了一大批先期投产的油水井套损现象十分严重，这不仅造成了巨大的经济损失，而且破坏了注采关系，大幅度地降低了油气产量。

In order to study basic roof's destruction movement that affects working face in horizontal section top coal caving in mining steep seams, this paper analyses tension of roof using elastic and thin board theory and concludes criterion of roof destruction based on long and narrow thin board.

摘要为研究急斜煤层水平分段放顶煤开采过程中基本顶破坏活动对工作面的影响，根据急斜煤层基本顶具有倾斜狭长板的特点，运用弹性薄板理论对基本顶岩层进行了拉应力分析，得出了顶板破断的判别准则，建立了基本顶初次破断后形成的&铰接结构&的力学模型。

Due to moment resisting connections are made in both directions in steel frames, so beam-to-column web connections are generally as flange connection. The construction and performance under load of web connections are different from flange connections, and there are more difficulties for theory analysis and design. Studies on mechanism of beam-to-column web connections under cyclical load are not only significant to the theoretical research, but also important in practice.

钢结构框架一般纵横两个方向均为框架，梁柱腹板连接非常普遍，构造和受力性能与翼缘连接不同，而且理论分析和设计更为困难，研究钢框架梁柱腹板连接在循环荷载作用下的受力性能和破坏机理并提出抗震设计对策，具有重要的理论意义和重大的工程应用价值。

One is the general atmosphere of secrecy in which it is carried out, the other the lack of freedom of the individual research worker.

in which 在用定语从句时，不能破坏原来的句子结构，通常由介词和疑问副词组合在一起构成定语从句。

So bring forth the countermeasure of appraisal and repairing and reduce the loss of durability damage are study subj...

因而对已有钢筋混凝土结构提出评估与修复对策，减少耐久性破坏造成的损失，是一项具有重大意义和社会经济效益的研究课题。

It is widely concerned in fatigue of concrete structures. In this paper, concrete triaxial compression fatigue experiments and tension-compression fatigue experiments with constant confinements in two lateral directions have been carried out using a self-modified loading apparatus. Based on the analysis of the test data, the quantitative principles of concrete fatigue deformation and the calculation method of fatigue strength are determined.

混凝土结构的疲劳是一个广为关注的问题，本文针对这一问题结合国家自然科学基金项目——混凝土多轴变幅疲劳破坏准则(50078010)的研究，利用自制的试验加载装置完成了两向定侧压约束下混凝土三轴受压、三轴拉-压等幅和变幅疲劳试验，对试验结果进行了分析。

It will take a lot of spit and polish to get this room habitable again.

房屋结构只遭到轻微的破坏，稍经修理即可居住。

Contact without structural failure The Ultrasport landing gear was designed to have large deflections in normal operation.

可提供最大能量吸收，并减少2.5G的落地重力，完全不破坏本身的结构。

Too much debt, or badly structured debt, can distort investment incentives and lead eventually to disinvestment.

过多的债务或是债务结构不良都可能破坏投资的兴趣，而最终导致投资减少。

In this thesis, the designing methods, constructing techniques, mechanical behavior and failure mechanism of pref...

本文通过结构模型试验和非线性有限元计算研究了预弯预应力混凝土梁的设计制作方法、力学性能和破坏机理等。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。