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题目:空腹桁架钢框架结构

受力性能分析及试验研究

院(部):土木工程学院

专业:土木工程

班级:土木013

姓名:张三

学号:2001888888

指导教师:张九光

完成日期:2005年6月30日

摘要··································································Ⅲ

ABSTRACT····························································Ⅳ

1前言·································································1

1.1空腹桁架钢框架的特点及研究意义········································1

1.2空腹桁架钢框架的研究现状··············································3

1.3现有研究的不足及本文的研究内容········································5

2空腹桁架钢框架有限元建模及验证····································8

2.1引言··································································8

2.2弹塑性分析方法简介···················································12

2.3ANSYS在空腹桁架钢框架弹塑性分析中的应用····························18

2.4ANSYS分析模型正确性检验············································20

2.4.1ANSYS分析模型概述················································21

2.5小结·································································21

3空腹桁架钢框架受力性能有限元分析·································23

3.1引言·································································23

3.2空腹桁架钢框架与普通钢框架力学性能对比·······························26

3.3影响空腹桁架钢框架力学性能的因素·····································29

4空腹桁架钢框架极限承载力试验研究·································30

4.1试验目的·····························································30

4.2模型设计依据·························································32

4.3试验概况·····························································35

4.4试验过程描述·························································38

4.5试验结果·····························································45

4.6小结·································································55

5结论································································56

谢辞··································································57

参考文献·······························································58

附录··································································59

摘要

空腹桁架钢框架是在钢框架的基础上,通过取消框架中间的柱子来增大结构的使用空间,同时为了不增大各个构件的截面尺寸,在框架的隔层增设腹板柱形成空腹桁架与钢框架组合的结构体系.由于在钢框架中增设腹板柱形成空腹桁架结构,进一步增强了结构的水平刚度和竖向刚度,同时提高了结构的整体工作性能,进而实现了结构的大跨度.本文通过大量的算例分析,探讨空腹桁架层的节间数,节间间距,腹板柱的刚度以及结构的跨度对整体结构的受力性能,极限承载力及破坏模式的影响,分析表明:通过合理的桁架层设计,可以有效的提高结构的竖向刚度和水平刚度,以及结构的极限承载力,并可以使结构的塑性变形首先出现在腹板柱上,这有利于结构内力的重分布,增加结构的延性性能,充分发挥构件的极限承载能力.

关键词:空腹桁架钢框架,受力性能,弹塑性分析,极限承载力,试验研究

AnalysisoftheLoadBearingBehaviorofVierendeelTruss-steelFrameandExperimentStudy

ABSTRACT

Vierendeeltruss-steelframehaswidetechnicalapplicationthatcanbeappliedtothestaggeredtrussstructureandtransferstructure.Ithasimportanttheorysignificanceandvalueoftechnicalapplicationtoresearchthebehavior,theultimateload-carryingcapacityandstructuraldestroymode.

贩贩贩贩eel

KeyWords:vierendeeltruss-steelframe,loadbearingbehavior,elastoplasticanalysis,ultimateload-carryingcapacity,experimentalresearch

1前言

1.1空腹桁架钢框架的特点及研究意义

空腹桁架钢框架是在钢框架的基础上,通过取消框架中间的柱子来增大结构的使用空间,同时为了不增大各个构件的截面尺寸,在框架的隔层增设腹板柱形成空腹桁架与钢框架组合的新型钢结构,结构形式如图1.1.由于在钢框架中增设腹板柱形成空腹桁架结构,进一步增强了结构的侧向刚度和竖向刚度,同时提高了结构的整体工作性能,进而实现了结构的大跨度,而且桁架层的上下弦梁的截面高度不大,不影响建筑物的使用,并可以在一定的建筑高度范围内代替钢框架-剪力墙结构和钢框架-支撑结构.

与实腹式桁架和混合式桁架不同,空腹桁架钢框架的节间无斜杆,在水平荷载作用下,桁架层剪力主要由腹板柱承担.如果桁架层的结构形式布置不合理,当空腹桁架钢框架的跨度很大时,结构在竖向荷载作用下往往会产生过大的挠度,影响建筑物的使用.但是,桁架层节间没有斜杆,可以方便的在建筑物上布置门洞以及走廊,同时,在结构受力分析上,空腹桁架钢框架的内力计算比较简单,并且节点的处理比较简单,传递路径比较明确,在实际工程中得到广泛的应用.

图1.1空腹桁架钢框架图1.2交错桁架结构体系

空腹桁架结构应用比较广泛,它可以组合应用,例如:相邻榀的空腹桁架按照一定的规律布置且腹板柱的高度等于层高时,就属于交错桁架结构体系(如图1.2),空腹桁架也可以单独应用,例如作为结构的转换层(如图1.3)或者桁架式框架梁结构(如图1.4)等等.在实际工程的应用中表明:空腹桁架结构的构成相对简单,受力性能良好,能够在重载情况下实现较大的跨度,具有其它结构体系所不具备的优势.而钢结构具有强度高,延性好,自重轻,标准化程度高等优势,因此,将空腹桁架结构应用于钢结构中也将会具有较好的受力性能.但是,目前人们对空腹桁架钢框架的研究还处于初始阶段,全面分析影响空腹桁架钢框架受力性能的因素以及结构的破坏形式对推广空腹桁架钢框架有重大的意义.

图1.3空腹桁架转换层图1.4桁架式框架梁结构

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