摘要
工形预应力混凝土(PC)梁在实际工程结构中的应用非常广泛,T形、倒T形和矩形梁都是工形梁的特殊简化形式,建立简单实用的工形PC梁的分析模型非常有实际意义.从材料非线性本构关系出发,通过截面分析导出工形PC截面的弯矩—曲率(M-)关系,由此确定沿梁长度方向所有单元的抗弯刚度,建立起考虑材料非线性的工形PC弯曲梁的宏观有限元模型.试验梁分析结果与试验数据对比表明,该模型能模拟PC弯曲梁整个加载过程的非线性结构响应.
Pre-stressed concrete (PC) beam with I-shaped section has been widely applied in practical engineering structure. Beam with T, inverted T or rectangular section is its special simplified form. It is a practical job to establish a simple and efficient analysis model for such PC beam. From the nonlinear stress-strain relationships of constitutive materials, moment-curvature (M-φ)relationships of I-shaped PC section, through which bending-resistance stiffness of all elements along the beam can be determined, are established by section analysis. Based on these, a macroscopic finite element model considering the material nonlinearity for analysis of PC bending beams with I-shaped section is developed. The comparison between the test result of one tested beam and the test data indicates that this model is capable to simulate the nonlinear response of a PC beam over the entire range of loading up to failure.
出处
《工程设计学报》
CSCD
2004年第5期284-287,共4页
Chinese Journal of Engineering Design
基金
国家自然科学青年基金资助项目(10302025).
关键词
预应力混凝土梁
有限元
非线性分析
弯矩—曲率关系
prestressed concrete beams
finite element
nonlinear analysis
moment-curvature relationships
