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设计方法是工程结构设计规范的主要内容,是反映规范水平的一个重要标志。随着科学技术的不断发展,工程结构的设计方法也在不断地演化和更新,使所设计的工程结构更符合实际需要,且具有更高的社会和经济效益。工程结构设计方法的发展过程大体如下: 早在19世纪末,在材料试验科学和弹性理论的发展下,建立了以弹性理论为基础的容许应力设计法。该法是通过对材料强度的折减来保证结构的使用可靠性。这个折减系数即安全系数。但由于此法将影响结构可靠性的各种不同性质的随机因素(如荷载、材料强度和结构
The design method is the main content of the engineering design code and is an important symbol of the standard level. With the continuous development of science and technology, the design method of engineering structure is also constantly evolving and updating, which makes the designed engineering structure more in line with actual needs and has higher social and economic benefits. The development process of engineering structure design method is as follows: As early as the end of 19th century, with the development of material science and elasticity theory, the allowable stress design method based on elasticity theory was established. The law is to reduce the strength of the material to ensure the reliability of the structure. This reduction factor is the safety factor. However, due to the randomness of various properties that affect the reliability of the structure (such as load, material strength and structure