型柱受压构件试验

郭小农同济大学建筑工程系

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Ltd.1.理论知识轴心受压构件的稳定性轴心受压构件Ev-a轴lu压at力i通on过o形nl心y.。ated

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Ltd.局部失稳破坏-当板件很薄时，可能发生局部失稳破坏。1.理论知识1.2理想压杆和实际压杆理想压杆—无缺E陷va构lu件a。tion

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Pro缺陷C：opyright

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Pty

Ltd.初弯曲（对压杆承载力有何影响？）初偏心（对压杆承载力有何影响？）初扭曲（对压杆承载力有何影响？）残余应力（对压杆承载力有何影响？）1.理论知识1.3弹性微分方程和失稳形式思考—微分方程的本质是什么？？Evaluation

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Ltd.以上微分方程是根据形心轴还是剪心轴建立的？弯曲失稳扭转失稳弯扭失稳1.理论知识1.4

L型截面压杆的失稳形式思考：以下各类截面的压杆将发生什么失稳？Evaluation

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Aspose

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L型截面压杆的失稳形式L型截面为单轴对称截面Evaluation

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Aspose

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Ltd.第1个等式独立，第2、3个等式耦合有2种情况：绕x轴弯曲失稳；或绕y轴弯曲同时绕杆轴扭转的弯扭失稳。哪个长细比大，则发生那种失稳1.理论知识1.4

L型截面压杆的失稳形式思考题：图示L型截面压杆，绕弱轴弯曲后，会发生哪个方向的转动？Evaluation

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Aspose

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L型截面压杆的失稳形式思考题：图示L型截面压杆，绕剪心扭转后，会发生哪个方向的弯曲？Evaluation

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Aspose

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L型截面压杆的失稳形式思考：分析L型截面压杆的内力。再思考：如果轴向压力通过剪心，会发生什么失稳。Evaluation

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L型截面压杆的局部稳定问题三边简支板的弹性临界屈曲应力Evaluation

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Aspose

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Ltd.规范采用什么办法防止局部失稳？1.理论知识1.5

L型截面压杆的局部稳定问题思考1：从扭转失稳机理认识局部稳定和扭转失稳之间的关系。思考2：本试验中Ev，a板lu件at宽io厚n比on约l为y.20，ated

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L型截面压杆的局部稳定问题认识截面的抗扭特性Evaluation

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Ltd.思考：判断各类的截面的抗扭刚度1.理论知识1.6

L型截面压杆的欧拉荷载绕x轴弯曲失稳绕y轴弯曲失稳绕z轴扭转失稳绕y轴弯曲同时绕z轴扭转失稳局部失稳Evaluation

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L型截面压杆的欧拉荷载绕x轴弯曲失稳计算长度Evaluation

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L型截面压杆的欧拉荷载绕x轴弯曲失稳长细比绕y轴弯曲失稳长细Ev比aluation

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Ltd.弯扭失稳等效长细比上述长细比均可化为相对长细比1.理论知识1.6

L型截面压杆的欧拉荷载思考1：比较L型截面压杆的5种欧拉荷载随着构件长度的变化规律。思考2：比较L型E截va面l压ua杆ti的o4n种on长l细y.比随着ated

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L型截面压杆的极限承载力欧拉公式Evaluation

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wit➢h有As缺p陷os压e杆.S的l弹id塑e形s失f稳or极.限N承ET载3力.5

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Aspose

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L型截面压杆极限承载力的规范计算公式稳定系数柱子曲线Evaluation

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Aspose

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Ltd.2.试验目的通过试验掌握钢构件的试验方法，包括试件设计、加载装置设计、测点布置、试验结果整理等方法E。valuation

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Ltd.通过试验认识L型截面轴心受压柱的弯扭失稳和局部失稳之间的关系。将理论极限承载力和实测承载力进行对比，加深对轴心受压构件稳定系数计算公式的

理解。3.试验设计3.1试件设计实现试验目的。考虑加载能力。Evaluation

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Pro考虑Co经py济r条ig件ht。2004-2011

Aspose

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Ltd.试件设计：试件截面（L型截面）B×t＝80×4.0mm；试件长度：L＝300~1500mm；钢材牌号：Q235B；3.试验设计3.1试件设计Evaluation

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Ltd.3.试验设计3.2支座设计（弯扭失稳）厚板支座；端部不可翘曲。Evaluation

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Pro端部Co不py可r扭ig转ht。2004-2011

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Ltd.端部不可转动。3.试验设计3.2支座设计（弯曲失稳）实现双向可转动；端部不可翘曲。Evaluation

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Pro端部Co不py可r扭ig转ht。2004-2011

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Ltd.双刀口支座；转动能力分析。3.试验设计3.2支座设计双刀口支座Evaluation

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Ltd.3.试验设计3.3测点布置需要测试那些数据？荷载、应变、变Ev形a、l转ua角tion

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Ltd.3.试验设计根据局部失稳临界应力采用有限元分析3.4承载力估算根据欧拉公式Evaluation

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Ltd.接近破坏：连续加载合理控制加载速率连续采集数据卸载阶段：缓慢卸载4.试验准备4.1试件截面实测名义截面和实际截面之间有差别实测3个~5个截面Evaluation

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Ltd.4.试验准备4.2材料拉伸试验试件编号 屈服力 极限力 屈服强度 抗拉强度 延伸率2314.0019.54321.84449.2624.00%414.0018.93333.33450.6722.00%512.0017.94285.71427.1427.00%613.5017.79321.43423.5720.00%平均值306.77434.6424.50%Evaluation

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Ltd.4.试验准备根据局部失稳临界应力采用有限元分析4.5采用实测截面和实测材料特性估算承载力根据欧拉公式Evaluation

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Ltd.4.试验准备预加载荷载一般为极限承载力的30%4.7预加载检测设备是否正常工作检测应变片和Ev位al移ua计tion

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