耐久性

On the basis of the current durability design theories and methods, a new durability design method is proposed for concrete structures. And it is based on equivalent resistance time dependant reliability under atmosphere environment.

在已有混凝土结构耐久性设计理论和方法的研究基础上，提出在大气环境下基于等效抗力时变可靠度的钢筋混凝土结构构件耐久性设计方法。

Therefore, the key to improve strength and durability of the concrete is to decrease flaws of concrete, especially to meliorate the structure of interface, which will improve the compactness and cohesion of interface, thus improve the strength and durability of the concrete.

因此，要提高混凝土材料的强度和耐久性等宏观性能，就必须减少其内部的微观缺陷，特别是要改善界面过渡区的结构，提高界面过渡区的密实性和黏结力，从而提高混凝土的强度和耐久性。

The study of paper is based on the durability estimating method and testing system of power nailer.

研究电动钉枪耐久性的评价方法，并在该方法的指导下进行电动钉枪耐久性试验系统的开发对于电动钉枪生产企业检验产品质量、判定产品耐久性具有重要的现实意义。

Based on fuzzy feature that the concrete crack width affects concrete structure durability, the membership function that the crack width belongs to the durability failure is established, the calculation method of fuzzy probability about structure durability failure is submitted, and classifing standard of the sturucture durability state is proposed, In accordance with the stochastic nature that cracks on concrete bridges occur and grow, and by assuming that crack occurrence obeys nonstable Poission process, predicting and evaluating methods about future crack condition and durability state of concrete bridge structures are suggested.

依混凝土裂缝宽度对混凝土结构耐久性影响的模糊特性，建立了裂缝宽度隶属耐久性失效的隶属函数，提出了结构耐久性失效的模糊概率计算方法，并建议了结构耐久性状态的划分标准；针对混凝土桥梁裂缝发生、发展的随机性，以裂缝的发生服从非稳态的泊松过程的假设为前提，提出了混凝土桥梁结构裂缝未来状况及耐久性未来状态的预测评估方法。

These achievement have reference value at theory and project certainly for durability assessment of concrete in structure predict and have reflected in the new Code for design of concrete structures.

这些成果对已有混凝土结构的耐久性评估预测和对待建混凝土结构的耐久性设计在理论和工程上都有一定的参考价值，在新版混凝土结构设计规范中有关耐久性的条目上也有所体现。

The durability problem of electronic equipment, the relationship among reliability , maintainability and supportability, and the character of electronic equipment are discussed.

主要讨论了有关电子设备的耐久性问题和耐久性与可靠性、维修性、保障性的关系以及耐久性的特点。

Durability zonation standard is proposed to provide useful parameters for durable concrete structure design.

文摘：混凝土结构耐久性环境区划标准的目的就是为混凝土结构耐久性设计提供合理的设计参数。

Commence from analyzed and tested raw materials quality effect on concreteresistance of seawater chlorion erosion, components in concrete raw materials,especially the effect of multiplication of high-performance water reducer andactive addition, were compared and selected. By designed and optimized mixratio, the components of testing concrete were determined, series test ofphysical mechanics performance and durability for high-performance concretewere conducted, and prediction model of durable years for high-performanceconcrete in harbour engineering was discussed.

从分析、试验原材料品质对混凝土抗海水氯离子浸蚀的影响笔试手，比选了混凝土原材料组分，尤其是高效减水剂和活性混合料复合的效应，通过配合比设计优化，确定了试验混凝土的组成，进行了海工高性能混凝土物理力学性能、耐久性系列试验，探讨了海工高性能混凝土耐久性使用年限的预测模式。

It can be accepted by the designers easily,and the different reliability request can be considered reasonably.The paper research is on the base of the current structure durability research. Through probability analysis,the design met hods of structural durability based on the probability limit states are established.

论文的研究目的是在当前结构耐久性研究的基础上，通过系统的概率分析，建立结构耐久性的概率极限状态设计方法，并将其推广应用于既有结构耐久性的评定，主要研究内容包括：1。

Based on the durability characteristics of prestressed concrete structures,the durability limit states of carbonation and chloride ion attack are defined,respectively.Durability predicting models on the basis of reliability mathematics and stochastic processes are constructed,and the pure theoretical formulae of failure probability of prestressed concrete structures are analyzed.

根据预应力混凝土结构的耐久性特点，分别定义了结构构件在碳化环境和氯离子侵蚀环境下的耐久性极限状态，建立了以可靠性数学和随机过程为理论基础的数学模型，并对耐久性失效概率进行了理论分析。

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％。