钢筋混凝土圆孔梁受力性能及加强方法研究
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(筑博设计股份有限公司，深圳 518000)[摘要] 钢筋混凝土圆孔梁可有效降低结构层高，但由于孔洞的存在破坏了梁的受力机理，降低了梁的刚度和承载力，并引发洞口局部的不稳定。以实际工程中的钢筋混凝土开洞梁为研究对象，基于合理的混凝土塑性损伤本构模型，采用有限元软件ABAQUS，对开洞梁的受力性能进行分析，并对比分析了几种加强措施对其承载力性能的影响。分析结果表明，在洞口布置钢套管和钢板，可以明显地提高洞口混凝土的承载力，为工程中梁开洞的安全设计提供参考。[关键词] 钢筋混凝土圆孔梁; 塑性损伤本构; 受力性能; 有限元模拟中图分类号：TU 375 文献标识码： A 文章编号：1002-848X(2013)S2-0545-04作者简介: 马镇炎, 硕士, 高级工程师, 院总工程师, 一级注册结构工程师, Email：13602651106@139.com。Bearing performance and strengthen design for reinforced concrete beam with round openingsMa Zhenyan, Wang Hongxin, Zhang Meisong, Zhang Zhenzhong(Zhubo Design Group ＆ Research Institute Co., Ltd., Shenzhen 518000, China)Abstract: The structure height can be reduced effectively for round openings of reinforced concrete beams, but the stress mechanisms of beams were broken by openings. The existences of round openings have effect on the stiffness and bearing capacity of reinforced concrete beams to some extent. Based on rational plasticity constitutive model of steel and concrete, the ABAQUS was adopted to establish the fine FEM model of reinforced concrete beams with round openings. Several strengthening measures were also analyzed to the bearing performance of concrete beams. It shows that the steel casing and plate can enhanced the bearing capacity of concrete beams effectively, and the method mentioned may give a reference to correlative designs.Keywords: reinforced concrete beam with round openings; concrete dam aged plasticity model; bearing performance; FEM simulation
