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1 应力分析的数学模型 目前,对钢筋混凝土受弯矩、扭矩、剪力共同作用下的内力研究主要有以下三种方法:扭矩平衡法,类似于抗剪计算中的斜截面强度法;空间桁架模拟法,类似于主拉应力计算法;经验公式法则是根据近年来国内的研究成果,并参考了国外的经验而建议的新的计算公式。其中前两种方法在分析过程中存在着相互渗透的趋势,主要体现在利用空间桥架模拟法的某些概念来求解扭面平衡法中的一些问题;经验公式则主要是应用在配筋计算中。 在进行内力分析时,首先要确定斜裂缝的开裂方向和构件破坏后断裂截面的形态。有关实验表明,开裂后构件的抗扭性能同空心薄壁构件的抗扭性能相似。因此可以利用空间桁架模
1 Mathematical model of stress analysis At present, there are mainly three methods for studying internal forces under the joint action of bending moment, torque, and shear force of reinforced concrete: Torque balance method, similar to oblique section strength method in shear calculation; space truss The simulation method is similar to the principal tensile stress calculation method; the empirical formula rule is a new calculation formula based on domestic research results in recent years and with reference to foreign experience. The first two methods have a tendency to infiltrate each other in the analysis process, which is mainly reflected in the use of some concepts of the space bridge simulation method to solve some problems in the torsional surface balance method. The empirical formula is mainly used in reinforcement calculations. . In the analysis of internal forces, it is first necessary to determine the cracking direction of the oblique cracks and the shape of the fractured sections after the components are destroyed. Experiments have shown that the torsional behavior of cracked components is similar to that of hollow thin-walled components. Space truss mode can therefore be used