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前言为了进一步改善我国现行规范中有关极限强度的计算公式,自1977年初起,我们共进行了64根不同配筋、不同钢种的预应力和非预应力钢筋混凝土矩形梁的试验研究。我国现行规范中受弯构件极限强度设计公式的基本规定之一是:构件的承载能力仅与受拉钢筋到达其屈服点(或条件屈服点)有关。这个规定是在低标号混凝土和有明显屈服台阶钢筋的基础上提出来的。但在我国,目前高标号混凝土和无屈服台阶的钢筋(钢丝)已大量应用于实际工程中。无屈服台阶的钢
Foreword In order to further improve the calculation formula of the ultimate strength in China’s current codes, since the beginning of 1977, we conducted a total of 64 experimental studies on prestressed and non-prestressed reinforced concrete rectangular beams with different reinforcements and steel types. One of the basic provisions of the ultimate strength design formula for flexural members in current codes in China is that the bearing capacity of a component is only related to the tensile reinforcement reaching its yield point (or conditional yield point). This rule was proposed on the basis of low-grade concrete and obvious yielding step reinforcement. However, in China, high-grade concrete and steel (steel wire) without yielding steps have been widely used in practical projects. Steel without yielding steps