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对于极限强度来说,预应力杆件可以被当作具有相当数量普通钢筋的非预应力杆件来处理。因此,钢筋混凝土梁的理论可以推广到钢筋混凝土及预应力混凝土梁。在扭转荷载下钢筋混凝土梁的实验性能确认了空间桁架模型的正确性。这个桁架破坏模型形成了一般横截面抵抗扭转与挠曲的极限强度理论的基地。这里,将就矩形横截面加以说明,并将提出它的扭转一挠曲相互作用图。设计公式是以具有43°斜杆的空间桁架为基础的。给出了承受扭转一挠曲一剪力的梁的设计法则及细节要求。但建议:首先按挠曲剪力设计,然后核对扭转的极限强度。参考了欧洲混凝土委员会(CEB)的规范,它对于扭转的新的要求是以空同桁架理论为根据的。本文是为了设计工程师妥善地处理扭转问题而提供工具。
For ultimate strength, prestressed rods can be treated as non-prestressed rods with a fair amount of normal reinforcement. Therefore, the theory of reinforced concrete beams can be extended to reinforced concrete and prestressed concrete beams. The experimental performance of RC beams under torsion load confirmed the correctness of the space truss model. This truss failure model forms the basis for the general cross-section theory of ultimate strength against torsion and deflection. Here, the rectangular cross-section will be explained and its torsion-flexure interaction diagram will be presented. The design formula is based on a space truss with a 43 ° diagonal bar. The design rules and details of the beams subjected to torsional-flexural-shear forces are given. However, it is advisable to first design the flexural shear and then check the ultimate strength of the torsion. With reference to the specifications of the European Concrete Commission (CEB), its new requirement for reversal is based on the same truss theory. This article is designed to provide engineers with the tools to properly handle the problem of torsion.