【導(dǎo)讀】將可塑的混凝土拌合物注入到模板內(nèi)，并將其搗實，然后進行養(yǎng)護，以加速水泥與水的水化反應(yīng)，最后獲得硬化的混凝土。具有較高的抗壓強度和較低的抗拉強度。由于鋼筋混凝土截面在均質(zhì)性上與標準的木材或鋼的截面存在著差異，因。此，需要對結(jié)構(gòu)設(shè)計的基本原理進行修改。將鋼筋混凝土這種非均質(zhì)截面的兩種組成。部分按一定比例適當(dāng)布置，可以最好的利用這兩種材料。這一要求是可以達到的?；炷劣膳淞蠑嚢璩蓾癜韬衔铮?jīng)過振搗并凝固硬化，可以做成任何一種需要的形狀。在其上涂油，鋼筋表面的銹及其他有害物質(zhì)也應(yīng)該被清除干凈。澆筑基礎(chǔ)前，應(yīng)將坑。了保證水泥的水化作用得以進行，必須具備上述條件?？p，這將有損與混凝土的強度，同時也會影響到水泥水化作用的充分進行。數(shù)值將導(dǎo)致一系列的試算與調(diào)整工作。土機司機來說是危險的，而對拉鏟挖土機則是不可能的。翻斗車車斗向前傾翻而司機坐在后方卸載，因此有時被稱為后卸卡車。

　　

【正文】 re, then structure into institutions。 Fatigue damage。 Elastic deformation of the change of the structure geometry significantly or plastic deformation or creep。 Structure on the sensitivity of the alternating load, fire and explosion. 2. Use limit state, which corresponds to the structure of the use function and durability. Examples include structure instability before too large deformation and displacement。 Too much early cracking or fracture。 The larger vibration and corrosion. Under conditions of different degree of safety, can put the structure checking calculation methods are divided into: (1) deterministic methods, in this method, the main parameters as nonrandom parameters. Probability method, in this method, the main parameters are considered to be random parameters. In addition, according to the different USES of factor of safety, can put the calculation method of the structure can be divided into: 1. The allowable stress method, in this method, the structure stress and the maximum load calculation are in accordance with the provisions of safety coefficient after the reduction of strength of materials. 2. The limit state method, in this method, the structure of the working condition is measured by its biggest strength as the basis. By theoretical analysis to determine the maximum intensity should not be less than structure calculation under load by calculate the intensity of the (limit). Computational load is equal to the multiplied by the coefficient of load live load and dead load separately. The sum of The corresponding to not multiplied by the coefficient of load live load and dead load working conditions (using) the stress pared with the specified value (using limit state). According to the former two methods and the four possible binations of the two methods, we can get some practical calculation methods. Usually adopt the following two kinds of calculation methods: deterministic method, this method USES the allowable stress. Probability method, this method adopts the limit state. At least in theory, the main advantage of the probability method can be science considers all random safety coefficient, and then these random safety coefficient bination into a certain safety coefficient. Probability method depends on: 1. In the process of production and installation of random distribution of the ma terial strength, the mechanical performance of the whole structure of numerical dispersion)。 2. The cross section geometry size and structure of uncertainty (caused by structure production and installation error and defect caused by)。 The effect on the str ucture of live load and dead load forecast uncertainty。 Adopted by the approximate calculation method about the inaccuracy of (the actual stress and calculated stress deviation). In addition, the probability theory means can be based on the following several factors to determine the risk of allowing, for example: 1. The importance of building and building damage caused by the dangerous。 2. Due to the building destruction threatens the life of the population。 3. The possibility of repair of buildings。 4. The structure of the life expectancy. All these factors are related to economic and social conditions, such as: 1. The structure of the initial construction cost。 2. Building use within the period of depreciation。 3. Due to destruction of buildings caused by the material and material damages。 4. The adverse effects in the society。 5. Mental and psychological considerations.