【作者】 王艳；

【导师】 郭秉山；

【作者基本信息】 西安科技大学 ， 结构工程， 2014， 硕士

【摘要】 在钢框架体系中，中心支撑框架具有良好的抗侧性能，是目前多高层钢结构中广泛使用的抗侧力体系之一，在工程应用方面有广阔的前景，但是由于支撑和框架各自的抗侧承载力不同，结构整体受力性能变得十分复杂，国内对钢支撑框架受力性能的研究尚浅，理论研究滞后于工程实践，因此对其受力性能研究具有重要的理论意义和工程应用价值。本文应用SAP2000软件对中心支撑框架采用三维建模的方法进行有限元数值模拟研究。考虑不同中心支撑类别、不同支撑布置形式以及不同支撑长细比对钢支撑框架的受力性能影响，建立13个有限元模型，运用模态分析以及静力弹塑性分析法深入研究结构的周期、楼层位移、层间位移角以及塑性铰的分布特点和发展规律。研究表明：纯框架的周期、楼层位移和层间位移角远大于人字形支撑框架，人字形支撑框架的刚度和抗侧性能远大于纯框架；V形支撑框架的周期、楼层位移和层间位移角总体上大于人字形支撑框架，人字形支撑框架的刚度和抗侧性能优于V形支撑框架；支撑不同布置形式对中心支撑框架的整体抗震性能有明显影响，建议中心支撑框架的支撑布置采用每跨均匀错列布置、“Z”字形错列布置形式；支撑作为结构的第一道抗震防线，首先出现塑性铰，接着梁屈服，最后柱屈服，多遇地震时框架处于线弹性阶段，结构无塑性铰出现，罕遇地震时框架处于弹塑性阶段，支撑和梁大量屈服，框架柱处于弹性变形阶段；随着支撑长细比的增大，中心支撑框架结构的周期、楼层位移和层间位移角均变大，支撑长细比越大，框架各个构件的塑性发展越好。更多还原

【Abstract】 In the steel frame systems,the concentrically braced steel frame (CBSF) has good lateralforce resistance performance,is one of the most common used lateral force resisting system inthe rise steel structure,and also it has broad prospects for engineering applications.However,because of the brace and the frame have different lateral force resistancecapacity,the integrated structure stress performance become very complicated,now researcheson the CBSF structure are finite in our country,and theoretical study lags behind engineeringpractice,therefore researching for its performance has an important theoretical significanceand engineering applications value.In this paper,concentrically braced steel frame (CBSF) model was established,whichusing Sap2000software and setting up three-dimensional model to study the finite elementnumerical simulation.Considering about the influence on the performance of steel-bracedframes from series model of different brace category,different brace layout and differentslenderness ratio of the brace,establishing13models,using modal analysis and static elastic-plastic analysis,study structure’s period,floor displacement,story drift angle and plastichinges’s development regular and distribution characteristic.The research show that: the period,the floor displacement and the story drift angle ofpure frame are much larger than the inverted-V concentrically braced steel frame (CBSF), thestiffness and the lateral force resistance performance of the inverted-V CBSF is much betterthan the pure frame.The period,the floor displacement and the story drift angle of theV-shaped CBSF are larger than the inverted-V CBSF, the stiffness and the lateral forceresistance performance of the inverted-V CBSF is superior to the V-shaped CBSF. Differentbrace layout of the CBSF has a obvious impact on the whole structure seismic behavior,thebrace layout of the CBSF is suggested using form of uniform layout in each span or"Z"-shaped layout in all span;brace as the first defense line of structure seismic appear plastichinge in the first place,then beams yield,at last column yield,in the case of frequently occurredearthquake,the frame is in the elastic morph stage and there is no plastic hinge,while in the case of seldomly occurred earthquake,the frame is in the elastic-plastic morph stage,lots ofbrace and beam yield,while the column is in the elastic morph stage.With the increasing ofbrace slenderness ratio,the period, the floor displacement and the story drift angle of theCBSF are both increasing; the bigger brace slenderness ratio,the better plastic development ofthe frame’s each components.更多还原