配筋混凝土砌块墙梁受力性能的有限元分析  

Finite element analysis of reinforced concrete block wall beam

作　　者：翟希梅[1] 国艳锋[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2009年第4期22-26,共5页Journal of Harbin Institute of Technology

基　　金：黑龙江省科技攻关项目(GC05A604)

摘　　要：为了研究配筋砌块墙梁的受力机理及其承载力影响因素,采用ANSYS有限元分析软件,在单元选取、模型建立、参数设置等方面得到可靠验证的基础上,进行了扩大参数分析,考虑了砌块墙体材料强度、墙梁上的洞口大小、洞口位置、托梁的高度、跨度及其纵筋配筋率、墙体中分布钢筋配筋率等因素对墙梁承载力的影响.结果表明:砌块墙体中的混凝土芯柱、竖向和水平分布钢筋将托梁和灌芯砌块墙体连接为整体,墙梁受力模式类似混凝土深梁;灌芯砌体强度、墙梁的跨度与托梁的纵筋配筋率是影响墙梁承载力的主要因素;洞口的存在会削弱墙梁的拱作用,使拱体形状及传力路径发生改变,造成其承载力降低;简支带洞口配筋砌块墙梁的托梁高跨比可以降低到1/14.The nonlinear FEA program ANSYS is adopted to research the mechanical behaviors of wall beam made of reinforced grouted concrete block. Based on the verification of test results and simulated results, the rationality and applicability of the selection of elements, the establishment of models, and the setting of parameters have been validated. So an extensive parametric study is conducted to analyze the effects of different factors on bearing capacity of the reinforced concrete block wall beam, including the material strength of grouted block wall, the size and position of the wall opening, the height, the span and the sectional reinforcement ratio of longitudinal steel for the trimmer beam, and the rebar ratio of the grouted wall. The results show that block masonry wall and cast - in - place RC trimmer beam work together by core columns with vertical reinforcement and the horizontal reinforcement in the block grooves, and the reinforced block wall beam acts like a deep beam. The strength of grouted block wall, the span and the reinforcement ratio of longitudinal steel of the trimmer beam are main influence factors of bearing capacity for wall beam. The opening will weaken the arch action and change the arch transfer path so as to reduce the capacity. The depth - to - span ratio of simply supported trimmer beam can be reduced to 1/14 at least.

关 键 词：配筋混凝土砌块 墙梁 洞口 承载力 托梁 

分 类 号：TU365[建筑科学—结构工程]