前言 确定结构安全性的方法:①规定在使用荷载下按弹性理论求得的应力低于以适当的安全系数除材料强度所得的容许应力,即以容许应力来确定结构物截面的方法;②分别考虑材料、荷载等其他因素的误差的或然率,分别定出各种安全系数,即所谓的极限状态设计法。 由于施工管理技术的提高,材料强度的误 Preface The method of determining the structural safety: ①Provide the method to determine the cross-section of the structure by allowable stress, the stress that is obtained under the use of load according to the elastic theory is lower than the allowable stress except the material strength with an appropriate safety factor; Taking into account the material, load and other factors of the probability of error, respectively, set a variety of safety factors, the so-called limit state design method. Due to the improvement of construction management techniques, the material strength is wrong