摘要
基于交错桁架结构质量和刚度分布均匀的结构特点,将交错桁架结构等效为一根压弯组合杆,通过对压弯组合杆曲率与弯矩及剪力的关系分析,建立了压弯组合杆的平衡微分方程,并基于龙格-库塔法推导出了考虑二阶效应影响的侧移迭代计算公式;采用该方法对交错桁架结构算例在考虑二阶效应和不考虑二阶效应2种情况下的楼层侧移进行了分析,并与有限元软件ANSYS的计算结果进行了对比。结果表明:提出的二阶效应计算方法具有较好的精度。
Based on the structural characteristics that the distribution of mass and stiffness was symmetrical in staggered truss structure, the load-carrying performance of staggered truss structure was equivalent to a pressure-bend combinational strut. Through the relationship analysis of curvatures and bending moments and shear forces of the pressure-bend combinational strut, balance differential equation of the pressure-bend combinational strut was erected. Based on Runge-Kutta method, the iteration calculation formula of lateral displacement of story was derived considering the influence of second-order effects. Authors analyzed the lateral displacements of story of staggered truss structure examples in the conditions of considering second-order effects or not, and gave a comparative analysis with finite element software ANSYS. Results show that the calculation method of second-order effect proposed in the paper has a good precision.
出处
《建筑科学与工程学报》
CAS
2011年第4期35-38,共4页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(50878215)
关键词
交错桁架结构
压弯组合杆件
二阶效应
楼层侧移
staggered truss structure
pressure-bend combinational strut
second-order effect
lateral displacement of story
