开口深梁在移动荷载下的压—拉杆模型计算方法

发布时间：2018-03-17 15:55

本文选题：开口深梁　切入点：压-拉杆模型　出处：《西安建筑科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：压-拉杆模型是解决不符合平截面假定的钢筋混凝土结构及设计不规则和复杂混凝土结构的有用工具。目前，固定荷载作用下钢筋混凝土深梁的压-拉杆模型已经有了很多的研究成果，但对深梁及开口深梁上作用有移动荷载时的压-拉杆模型研究较少。针对上述情况，本文主要进行了以下工作：（1）选择ANSYS拓扑优化方法建立能反映深梁真实传力路径的压-拉杆模型，以一个不开洞的简支深梁为例，研究了普通深梁基于压-拉杆模型的受剪承载力计算方法，用现有的深梁受剪承载力试验结果验证了压-拉杆模型的合理性。（2）研究了荷载移动时钢筋混凝土开口深梁压-拉杆模型的建立方法。研究表明，移动荷载下开口深梁的压-拉杆模型是不断变化的，，移动荷载存在最不利位置，可用最不利位置相应的剪力最大值确定钢筋数量、混凝土强度或梁截面尺寸。同时证明了拓扑优化算法可方便地构造开孔深梁的压-拉杆模型。（3）研究了洞口位置变化对基于压-拉杆模型的深梁受剪承载力的影响，随着洞口位置的改变，洞口对剪力传递路径的影响不断变化，但传力路径始终绕过洞口，洞口角部容易发生应力集中，因此洞口周围应加强配筋。最后，提出了基于最优拓扑优化的压-拉杆模型建立原则。
[Abstract]:The compression-pull bar model is a useful tool for solving reinforced concrete structures that do not conform to the assumption of plane section and for designing irregular and complex concrete structures. The compression-pull bar model of reinforced concrete deep beam under fixed load has been studied a lot, but the compression-pull bar model with moving load on deep beam and open deep beam is less studied. The main work of this paper is as follows:. 1) the ANSYS topology optimization method is selected to establish the compression-pull rod model which can reflect the true transmission path of deep beam. Taking a simple supported deep beam without holes as an example, the calculation method of shear capacity of ordinary deep beam based on compression-pull bar model is studied. The test results of the shear capacity of deep beam are used to verify the rationality of the compression-pull bar model. In this paper, the method of establishing compression-pull bar model of reinforced concrete open deep beam under moving load is studied. It is shown that the compression-pull bar model of open deep beam under moving load is constantly changing, and the moving load has the most disadvantageous position. The maximum shear force corresponding to the most unfavorable position can be used to determine the quantity of steel bar, the strength of concrete or the section size of beam, and it is proved that the topological optimization algorithm can easily construct the compression-pull bar model of deep beam with open hole. (3) the influence of orifice position on shear capacity of deep beam based on compression-pull bar model is studied. With the change of orifice position, the influence of orifice on shear transfer path is constantly changed, but the force transfer path always bypasses the opening. The stress concentration is easy to occur in the corner of the hole, so the reinforcement should be strengthened around the opening. Finally, the principle of establishing the pressure-pull rod model based on the optimal topology optimization is proposed.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.1

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