摘要
进行了20个型钢混凝土构件的推出试验、20根型钢混凝土偏心受压柱试验,以及23根型钢高强混凝土柱在反复荷载作用下的试验。通过在型钢与混凝土之间埋设的电子滑移传感器和电阻应变片,得到了粘结应力和内部滑移沿型钢埋置长度的分布规律;考虑了混凝土强度、型钢的保护层厚度和埋置长度,以及横向配箍率等诸因素,建立了型钢混凝土粘结强度的计算公式;分析了构件长细比、荷载偏心距对粘结强度和滑移应变的影响,提出了偏心受压柱粘结滑移本构关系的一般表达式;研究了型钢高强混凝土柱在动力作用下粘结滑移的分布规律和粘结退化机理,提出了反复加载条件下的粘结滑移本构模型。结合目前广泛应用的大型商业软件ANSYS程序,对型钢混凝土构件的非线性有限元分析方法进行了研究,全面介绍了数值计算中所涉及到的材料模型定义、几何模型建立、单元划分、约束条件处理等技术问题,并提出了采用非线性弹簧单元(Combination39单元)对型钢混凝土粘结滑移进行模拟的实用方法。
The bond-slip tests were carried out on 20 push-out specimens,20 steel reinforced concrete columns in eccentric compression, and 23 steel-high strength concrete columns under horizontal repeated and reversed loading. By means of electric slip sensors and strain gauges embedded between the shaped steel and the concete,the distributions of bond stress and slip along anchorage length were measured. The regression formulae for determining the bond strengths were established with taking account to such factors as the strength of concrete,concrete cover,embedded length of the shaped steel and transverse stirrup ratio. The influences of slenderness ratio, load eccentricity on the bond strength and the slip strain were analyzed. The bond slip constitutive equations for steel reinforced concrete column in eccentric compression were proposed. The distributions of bond-slip and mechanism of bond degeneration under horizontal repeated and reversed loading for steel high strength concrete column were also studied, and the bond-slip constitutive models under cyclic loading were put forward.
By combination with the widely used ANSYS ,orogram.the nonlincar finite clement method for analysis of steel reinforced concrete members was sudied.The major skills of numerical simulating such as the definition of the material property,cstablishment of the geomctrical models.plotting of the clement and the definition of the houndary conditions were fully illustrated.The practica methods for simularing the bond slip relationships by nonlinear spring element of combination39 type were cspecially proposed.
出处
《建筑钢结构进展》
2006年第5期8-16,共9页
Progress in Steel Building Structures
基金
国家自然科学基金资助项目(资助号50108013)
陕西省自然科学基础研究计划项目(2002E213)
陕西省教育厅自然科学专项基金资助项目(01JK173)
关键词
型钢混凝土(SRC)
粘结滑移
本构关系
数值模拟
steel reinforced concreted（SRC）
bond slip
constitutive relationship
numerical simulation
