《混凝土结构设计原理》双语 (8).ppt

Chapter 8 Torsion 8.2 Basic elastic behavior of rectangular section subjected to torsion Rectangular section 8.3 Basic plastic behavior of rectangular section subjected to torsion Sand-heap analogy Calculation methods for T section and 口section 8.4 Cracking resistance of R.C. beam subjected to torsion 介于纯弹性和纯塑性之间 8.5 Behavior of R.C. beam subjected to pure torsion 8.6 Failure modes 纵筋于箍筋的配筋强度比ζ 8.7 Ultimate torsion resistance 8.7.1 Space truss analogy theory Ultimate torsional resistance Tu 8.9 Design formula for pure torsion Rectangular section 计算公式与试验值的比较 Lower bound Upper bound T I section Example 8.10 Behavior of concrete under combined torsion, shear, and bending 8.10.2 Torsion and bending moment 8.10.3 Torsion and shear 8.10.4 Torsion and shear and bending 8.11 Design of R.C. beams subjected to combined torsion, shear, and bending The longitudinal reinforcements for torsion and bending are calculated separately and then added together The stirrups for torsion and shear are calculated separately and then added together Consider the relevance （相关性）of concrete in torsion and shear 8.11.1 Design formula 8.10.1 Failure modes (a) Compression failure —— top surface Torsion vs. bending (b) Compression failure —— lateral surface Torsion vs. shear (c) Compression failure —— bottom surface Torsion vs. bending small Torsion 所有纵筋均受拉 Bending 拉区纵筋As受拉 压区纵筋As’受压 Torsion Bending + 弯拉区纵筋As拉力增大 弯压区纵筋As’拉应力减小，甚至受压 两者不一定都屈服 纵筋配筋强度比 1.0 1.0 1.0 -1.0 0 T0：纯扭极限承载力 M0：纯弯极限承载力 对称配筋 1.0 1.0 1.0 -1.0 0 非对称配筋 1.0 1.0 窄 腰筋太少 极限承载力主要 取决于扭矩T 1.0 1.0 宽 都产生剪应力，但分布规律不同 T V + The section is subjected to higher shear stress as the combined effect of the two load types 1.0 1.0 1.0 1.0 1.0 1.0 1.0 C A B Strength in pure torsion of the member with torsional reinforcement only The strength in pure bending of the same member with flexural reinforcement only Resistance of the same member after adding torsional and bending reinforcement together 1.0 1.