均布荷载下深梁设计的压杆-拉杆模型

Strut-and-tie Model of Deep Beam Design Under Uniform Distributed Loads

为使钢筋混凝土深梁的设计建立于合理的理论基础之上,研究了基于压杆-拉杆模型的深梁设计方法。通过将均布荷载下的钢筋混凝土深梁简化为多个具有同一拉杆的简单桁架,建立了均布荷载下深梁的压杆-拉杆模型,推导出了拉杆拉力、压杆压应力的计算公式,并用一个实例验证了该方法。研究结果表明:在该模型中,与拉杆夹角为26.5°的斜压杆控制混凝土的强度,与拉杆夹角为90°的斜压杆控制限制裂缝的最小配筋量。

In order to make designs of deep beam based on appropriate theory, a design method of deep beam under uniform distributed loads by using strut-and tie model was developed, for which the reinforced concrete deep beams were modeled as a serial of simple trusses with a common tie, and the equations for computing tension stress in tie and compression stress in strut were derived. An example was given to demonstrate its using model. The study results show that the diagonal strut with the angle 26.5° of tie controls the strength of concrete and strut with the angle 90° of tie controls the minimum reinforcement requirements for limiting cracks.