查询词典 field fortification

How to ensure this new structure to be in elastic state under frequent earthqu ake, be mendable under design earthquake and not collapse under infrequent earthquake, especially the last item, is the problem to be solved imminently in engineering field. Center around this problem, 5 aspects of investigation are carried out as following:(1) The experiment of seismic performance of ASCCs in this new frame structure has not been reported, in order to study this problem, 9 ASCC specimens with shear steel plate are tested subjected to the horizontal low cyclic loading, in which, the shear span ratio is 3 and axial compression ratio is different. The hysteretic curves of 9 specimens are obtained. The seismic performance indexes such as energy dissipation, stiffness degradation, strength degradation, skeleton curves and ductility of this kind of column are acquired, and the seismic fortification measures including ultimate values of axial compression ratio under different seismic degree are suggested.

1新型框架结构中所采用的角钢混凝土柱抗震性能的试验研究尚未见报道，针对这一问题，本文进行了9根剪跨比为3、不同轴压比、采用钢板箍的角钢混凝土柱在水平低周反复荷载作用下的试验研究，获得了9根试验柱的滞回曲线，考察了该类柱的耗能、刚度退化、抗力衰减、骨架曲线及延性等抗震性能指标，建议了角钢混凝土柱在不同抗震等级下的轴压比限值等抗震构造措施。

As an example, the deposited oil Offshore Platform BZ28-1 of BohaiOil Field in China was numerated with genetic algorithms. The results show that the proposed method is significative in the design of the platforms.5. Theory and method of optimum design of earthquake-resistant structures based on optimal fortification intensity were introduced. Optimum design was performed for Platform BZ28-1 of Bohai Oil Field in China according to principle of three-level fortification and aseismic design method of two-stage of code for aseismic design of buildings.

介绍了基于最优设防烈度的抗震结构优化设计的理论和方法，并以渤海油田BZ28-1储油平台为例，在目标函数中既考虑了结构的造价又考虑了损失期望，根据&小震不坏、中震可修、大震不倒&三个水准的抗震设防原则，利用抗震规范的&二阶段&抗震设计方法，对其进行了结构优化设计，得到了考虑造价和损失期望、基于最优设防烈度的最优设计方案。

The research of the asymmetric-plan building under the earthquake is one of the difficult points in the seismic fortification field. The simulation of the RC frames designed according to the seismic code is very useful to improve the design method and reduce the earthquake calamity.

平面不规则结构在地震作用下的非线性扭转反应分析是结构抗震领域中研究的难点问题之一，采用纤维模型梁柱单元的结构空间动力非线性分析程序，结合抗震规范的设计要求，开展对不规则结构的空间地震反应分析的研究与评估，有利于提高结构的设计水平，改进抗震措施，从而减少实际扭转震害的发生。

Marines would learn that the Chinese, despite problems of weather and terrain, were avid diggers and experts at field fortification.

陆战队员们将了解到尽管天气和地形相当恶劣，但中国人仍然相当积极地挖掘掩体并擅长于构筑野战工事。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。