The importance of engineering reliability theory is self-evident, but all projects involving structures, such as buildings, ports, water conservancy and hydropower, oceans, highways, railways, etc. Engineering reliability theory is the highest design guidance, and the application of reliability theory is everywhere. Throughout the book, the most fundamental purpose of engineering structure design is to ensure the reliability of the structure, even if it is established under any circumstances, and to pursue economic benefits on this basis. In other words, the basic purpose of engineering structure design is to choose the best balance between the reliability and economy of the structure, and strive to make the structure complete the predetermined function in the most economical way within the predetermined service life (design working period).
Structural design, from the early "biological analogy method", allowable stress design method, failure stage design method to the recent reliability design method, has experienced a difficult process from empirical design to theoretical design. Although the theory needs to be improved, with the development of mathematics and the continuous progress of theory, reliability design will go further and further.
The significance of structural reliability method lies in that it puts forward a series of concepts, principles, methods and measurement standards based on probability analysis for structural safety detection, comprehensively considers various uncertain factors in engineering structures, and objectively and uniformly measures structural reliability.
The focus of structural reliability method is how to determine the reliability index. Generally, there are central point method, check point method, equivalent normalization method, response surface method and Monte Carlo method. The rationality and accuracy of reliability index determine the rationality of structural design.
Since reliability design is probabilistic design, the importance of probability theory is self-evident. Probability theory provides a theoretical basis for reliability design. Not only the description and influence of various functions and resistances can be expressed by mathematical formulas, but also the reliability index has its clear geometric significance. However, all natural disciplines are inseparable from the support of mathematics, and the development of reliability design and probability theory, which are closely related to engineering practice, will certainly promote the long-term progress of reliability.
From the study of this course, I realized an important way of thinking. Reliability theory is to establish. In order to solve this problem, various methods are tried, and finally the reliability theory is chosen. It can be seen that the development of any subject is inseparable from good questions, just as mathematics developed so rapidly in the 20th century because of Hilbert's famous 23 questions. When you have a good and difficult problem, focus all your energy on it, think about anything related to it, try to think and solve it from different angles, and finally find the essence of the problem and finally solve it. Problems are the driving force of development. In the later learning process, finding and asking questions is a link that cannot be ignored.
II. Introduction to Load and Structure Design Method:
This book is compiled with reference to the basic requirements of the National Civil Engineering Professional Steering Committee for students majoring in civil engineering and the approved syllabus. The book is divided into 10 chapters, including: introduction; Gravity load; Wind load; Earthquake action; Lateral pressure; Other loads and effects; Statistical analysis of load; Statistical analysis of resistance of structural members; Structural reliability analysis and calculation; Probabilistic limit state design method. In addition to thinking questions and exercises, each chapter is accompanied by teaching tips and requirements to facilitate teaching. This textbook can be used as a teaching book for civil engineering and related majors in colleges and universities, and also as a teaching material for continuing education or a reference book for civil engineering designers and engineers.