Implementation points of concrete and metal frame buildings
1- The design resistance of a section of a structural part is calculated by dividing the characteristic resistance by partial safety coefficients for the resistances.
2- Factors affecting the structures of buildings that should be considered in the design include dead and live loads, wind load and force caused by earthquakes and some other factors.
3- Class C50 concrete is meant with 50 megapascal characteristic strength.
4- If it is to be planned for a simple beam under a wide uniform load, an executive joint (deposit surface) should be placed in the middle third of the length of the beam.
5- Determining the mixing ratio based on experience and without laboratory study is applicable for concrete class 12 and below.
6- The maximum pouring temperature for concrete in hot weather is 30 degrees Celsius.
7- Poor environmental conditions for concreting, i.e. dry environment with less than 50% humidity and not protected.
8- To deal with sulfates, slag cement and type 5 cement are recommended.
9- In coastal areas, in order to increase the reliability of concrete, the minimum amount of cement is 360 kilograms per cubic meter and the maximum ratio of water to cement for concrete exposed to the environment is 0.4.
10- Factors of combination of loads are considered to take into account the lower possibility of the simultaneous occurrence of a larger number of factors.
11- The bearing capacity of a piece of reinforced concrete means the calculated resistance of the piece based on the dimensions of its sections and calculated resistances.
12- Bending and unbending test is mandatory for modified cold rebars.
13- Mold removal and dismantling of the bases under the towers is done from the free end.
14- The average compressive strength required in the concrete mixing design is obtained by applying standard deviation and fixed values to the characteristic strength.
15- In terms of dealing with chlorine solutions, type 2 cement works better than other types of Portland cement against environments with sulfate and chlorine solutions.
16- It is recommended to measure the temperature of concrete in hot weather, the maximum temperature of cement is 70 degrees Celsius and the maximum temperature of concrete during pouring is 30 degrees Celsius.
17- Cement in which storage compression has occurred can be used after pulverizing the lumps.
18- The frequency of concrete sampling should be at least one concrete sample from each concrete category per day and at least 6 samples from the entire structure.
19- In case, the method of operation and care is considered satisfactory if the compressive strength of workshop samples at any age is at least 85% of the resistance of samples processed in the laboratory.
20- It is mandatory to take at least one sample from each category of concrete every working day.
21- The most suitable place for concrete deposit surfaces is the place where the efforts, especially the shear force, have the least amount.
22- The meaning of curing concrete means keeping the concrete moist for a sufficient time, preventing the harmful effects of external factors, and depending on the case, setting and hardening with the help of heat.
23- Dismantling the safety foundations is allowed when the concrete strength has reached the desired 28-day strength.
24- Samples of awareness are prepared in order to know the quality of concrete on specific dates.
25- It is better to use terrace cement or type 2 cement in making concrete for massive foundations.
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