钢管桁架结构加强型K节点抗震破坏机理及设计对策

项目名称： 钢管桁架结构加强型K节点抗震破坏机理及设计对策

项目编号： No.51468054

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 杨文伟

作者单位： 宁夏大学

项目金额： 48万元

中文摘要： 节点是钢管桁架结构的关键部位也是地震作用耗散能量的部位。结合国内外研究现状，运用非线性有限元分析和钢模型足尺试验，对钢管桁架结构的主圆支圆（C-C）及主方支圆（R-C）K型搭接节点，在不同加强措施下的节点抗震性能进行了系统的理论分析及试验研究，以探究不同形式的加强型K节点的抗震破坏机理；将混合强化、损伤本构引入循环荷载三维大变形有限元分析中，构建混合强化本构模型，为管桁结构连接节点滞回性能的计算机模拟奠定基础；根据不同形式的加强型K节点的滞回特性，量化评价其变形能力和耗能能力，得到不同形式的加强型K节点关键参数的合理取值；通过试验及有限元分析得到加强型K节点的恢复力模型，提出不同形式加强型K节点的承载力计算公式，形成带有加强型K节点管桁结构的抗震实用设计方法，为大跨度钢管桁架结构的设计与施工提供理论依据和技术支撑。

中文关键词： 钢管桁架结构；加强型K节点；抗震性能；试验研究；有限元分析

英文摘要： Unstiffened tubular joint is the key part of truss structure of steel tubular and the part which can dissipate the energy that produced by the infrequent earthquakes. Theoretical analysis and experimental study were conducted under low cycle load reversals to study the seismic behavior of unstiffened overlapped C-C and R-C reinforced K-joint of truss structure of steel tubular with the use of non-linear finite element analysis and full scale quasi-static tests and research status at home and abroad, different forms of reinforced K-joint seismic failure mechanism was explored. Mixed hardening constitutive model was established with the mixed hardening and the damage constitutive introduced to the three-dimensional large deformation finite element analysis under cyclic loading. The computer simulation of steel tubular connection joints hysteretic behavior to lay the foundation. To hysteretic characteristics of different type reinforced K-joints, the deformation capacity and energy dissipation capacity was quantitative evaluated, the reasonable value of the key parameters was acquired. Through the analysis of the testing data and finite element, restoring force model of reinforced K-joints was acquired, different type reinforced K-joints bearing capacity formula was raised, the practical design method for reinforced K-joints seismic was formed. Provide a theoretical basis and technical support for the design and construction of large-span steel truss structure.

英文关键词： steel pipe truss structure;reinforced K-joint;seismic behavior;experimental study;finite element analysis