Question 1: What is the definition of structural reliability? What aspects are included? Under the specified time and conditions, the probability that the engineering structure completes the predetermined function is the probability measure of the reliability of the engineering structure. The reliability of engineering structure refers to the ability of engineering structure to meet the expected functions of safety, applicability and durability under specified time and conditions. Because there are uncertainties in various factors affecting reliability, such as changes in load and material properties, imperfections in calculation models, and differences in manufacturing quality. And these factors are random, and the ability of engineering structure to complete the predetermined function can only be measured by probability. The probability that the structure can complete the predetermined function is called reliability probability; The probability that a structure cannot achieve its expected function is called failure probability. The purpose of engineering structure design is to strive for the best economic benefits and limit the failure probability to an appropriate level acceptable to people in practice. The smaller the failure probability, the greater the reliability, and the two are complementary. Safe, applicable and durable

Adopt it

Question 2: What indicators are used to measure the reliability of the structure? The design of the engineering structure at 10 point according to the limit state shall meet the following requirements:

g(X 1，X2、...XN)≥0

When there are only two comprehensive variables, action effect and structural resistance, the design of engineering structure according to the limit state shall meet the following requirements:

g(S，R)=R―S≥0 (2.0.9-2)

In the formula, the function of S structure should be;

R- structural resistance.

Question 3: What does the reliability of the structure include? How reliable is the structure? 1. The phenomenon of "blue brittleness" is generally within 200 degrees, but at about 250 degrees, the tensile strength of steel increases, while the plasticity and impact toughness become worse and the steel becomes brittle. In this temperature range, steel is often brittle and becomes "blue brittle" (the surface is oxidized to be blue).

2. Cold Brittleness at Low Temperature When the temperature drops from normal temperature, the strength of steel increases slightly, but the brittleness tendency increases, and the plasticity and impact toughness decrease. When the temperature drops to a certain value, the impact toughness of steel suddenly drops significantly, leading to brittle end cracking of steel. This phenomenon is called cold brittleness at low temperature.

Question 4: What are the aspects of structural reliability? The reliability of functional structure refers to the ability of the structure to complete the predetermined function in a specified time and under specified conditions. Including safety, applicability and durability.

The reliability of the structure refers to the probability that the structure will complete the predetermined function in a specified time and under specified conditions.

Question 5: What does the reliability of the structure include? How reliable is the structure? Structural reliability refers to the ability of the structure to complete the predetermined function under the specified time and conditions. Including safety, applicability and durability.

The reliability of the structure refers to the probability that the structure will complete the predetermined function in a specified time and under specified conditions.

Question 6: As an important part of power system, what are the reliability indexes of electrical main wiring? The reliability analysis of main electrical wiring in power plant is an important aspect to maintain the stable operation of power system. The reliability evaluation and calculation of electrical main wiring in power plant is to measure the ability of the whole system to meet the power supply continuity, operation safety and power supply adequacy based on the reliability parameters of the main wiring system and the system network structure, according to the system evaluation rules. It should be noted that after establishing the reliability mathematical model of each part of the system, it is necessary to determine the minimum cut set according to the logical relationship of the main wiring system and carry out equivalent treatment.

Question 7: The reliability of building structure, including the reliability of building structure, is directly related to the safety of people's lives and property, and has always been a major issue that must be faced and seriously solved in the design of building structure. The reliability of the structure refers to the ability of the structure to complete the predetermined function in the specified time and under the specified conditions. Structural reliability is a quantitative description of structural reliability, that is, the probability that the structure will complete the predetermined function in a specified time and under specified conditions. The reliability of building structure is also a national comprehensive economic policy issue, which is actually to choose the best balance between safety and economy.

Question 8: What are the reliability indicators of products? Generally speaking, they are: MTTF (unrepairable product) or MTBF (repairable product).

There are also indicators of maintainability and detectability of safety valves.