【作者】 宛海沫；

【导师】 顾强；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2008， 博士

【摘要】 随着国民经济的发展,人民生活水平的提高,钢结构住宅已经成为我国住宅产业一个新的发展方向。矩形钢管混凝土柱交错桁架结构既能满足人们对大空间的需求,也能满足居住者对舒适感的需求,是一种非常好的住宅结构体系。本文研究矩形钢管混凝土柱交错桁架结构体系的弹、塑性性能,以及混合式交错桁架的滞回性能,具有理论意义和实用价值。应用ETABS软件设计了27个10层～20层的矩形钢管混凝土柱交错桁架结构的算例,分别对竖向荷载和水平荷载作用进行了ANSYS有限元计算,提出了两种荷载作用下手算结构构件内力的平面系数方法,可为设计人员在初选构件截面时提供依据。对27个算例进行了恒定竖向荷载作用下,水平极限承载力的弹塑性计算,有限元计算中考虑了材料和几何双重非线性。根据计算结果分析了结构的破坏机理,薄弱环节以及各种因素(包括建筑层数、柱距、跨度、桁架节间数、结构长高比、结构长宽比、结构高宽比等)对结构性能的影响。研究结果表明,矩形钢管混凝土柱交错桁架结构的弹、塑性性能良好,塑性发展较充分,具有较好的延性性能,符合我国抗震设计的要求。另外,对一两开间三层矩形钢管混凝土柱交错桁架结构1/3缩尺模型试件进行了水平极限承载力试验,试验结果与有限元计算结果吻合较好。对混合式交错桁架在循环荷载作用下的计算和分析结果表明,7节间混合式桁架的滞回曲线饱满,没有明显的捏缩现象,塑性变形发展充分。分析了各种因素(包括桁架节间数、竖腹杆截面尺寸、斜腹杆截面尺寸、弦杆截面尺寸、柱截面尺寸等)对混合式桁架滞回性能的影响。本文较全面、系统地分析了矩形钢管混凝土柱交错桁架结构在静力作用下的弹性和弹塑性性能以及混合式交错桁架的滞回性能,提出的结论和设计建议对制定有关规范和指导工程设计有参考价值,也为进一步研究矩形钢管混凝土柱交错桁架结构体系打下了基础。更多还原

【Abstract】 In company with the development of national economy and the rising of the people living standard, steel structure residential construction is acting a new orientation in our country. The staggered truss structure with rectangle concrete filled tube column building can satisfy the needs of people, which is a perfect residential construction system. In this research, we study elastic and elasto-plastic of the staggered truss structure with rectangle concrete filled tube column and hysteretic behavior of mix form truss. Overall, the conclusion of this research has the practical means and theory guiding effect for the concrete engineering.This research designs twenty-seven structure models of the staggered truss structure with rectangle concrete filled tube column by ETABS computer software. Firstly, the author makes computation of twenty-seven elastic models under vertical or horizontal load by ANSYS finite computer software, after that processes these dates and advances a new way for these structural members’ internal force computation. The design engineers may compute the staggered truss structural members’ internal force by this way at the initial design stage. Further more, the author makes computation of twenty-seven elastro-plastic models under constant vertical and gradual increasing horizontal load by ANSYS finite element system method. Depend on the data analysis, we know the failure mechanisms, weak part of the staggered truss structure with rectangle concrete filled tube column, and then we analysis the effect factors (building story, bay length, span, truss spacing number, ratio of length-highness, ratio of length-width, ratio of highness-width ) on the structure elastro-plastic behavior. The author figures out that the staggered truss structure system with rectangle concrete filled tube column has outstanding elastic and elastro-plastic performance, development of plastic is sufficient, ductility is preponderance. This structural system is fitting in with the design demands of our country. Finally, the author makes a structural horizontal limit bearing laboratory test to the two bays-three stories the staggered truss structure with rectangle concrete filled tube column 1/3 reduced scale model specimen.The study about hysteretic behavior of mix form truss shows that hysteresis curve of the seven-space truss is full, and plastic deformation development is sufficient. After that, the author analyses the effect factors (truss spacing number, sectional dimension of vertical brace member, sectional dimension of diagonal brace member, sectional dimension of chord member, sectional dimension of column member ) on the truss structure hysteretic behavior.This research comprehensively and systematicly analyses the elastic and elastro-plastic behavior of the staggered truss structure with rectangle concrete filled tube column and the hysteretic behavior of the mix form truss. The conclusion and the design proposal have the significant meaning and consulting value for both engineering design direction and related regulations, furthermore, provide basis for further study of the staggered truss structure with rectangle concrete filled tube column.更多还原