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1、第一章概述Key1:Whatarethefeaturesofsteelstructure?(1)Highstrengthofsteel,lightweightofstructure(钢材强度高,结构质量轻)(2)Isotropicmaterial,highreliability(材质均匀,可靠度高)(3)Convenientfabrication,quickerection(制作方便,施工快速)(4)Goodleakproofness(密闭性好)(5)Heat-resistantbutnotrefractory(耐热不耐火)(6)Becorrodedeasily,maintain
2、edcostly(易腐蚀,维修费用大)Key2:TheDesignMethodofSteelStructureThestructurallimitstatea.Theultimatelimitstates:Thebasiccombinationofloadeffectsshallbeconsideredand,ifnecessary,theaccidentalcombinationofloadeffectsshallalsobeconsidered.b.Theserviceabilitylimitstate:Theloadstandardcombinationofsteelstr
3、ucturedesignisonlyconsidered.第二章钢结构的材料Key1:Therequirementsofsteelstructurematerial1)Higherfyandfu(有较高的fy和fu)2)GoodPlasticityandimpacttoughness(有良好的塑性和冲击韧性)(3)Goodmachinability(有良好的加工性能)(4)Goodadaptabilitytoworkingcircumstance(对环境良好的适应能力)Key2:Failuremodesofsteelstructurematerial(1)Plasticfailu
4、re(塑性破坏)Thereisobviousdeformationorcollapseomenbeforefailure.(2)Brittlefailure(脆性破坏)Thereislittledeformationornowarningbeforefailure.(3)影响脆性破坏的因素--化学成分、冶金质量、温度(低温)、冷作硬化、时效、应力集中、复杂应力。Key3:Themainmechanicalpropertiesofsteel(1)Strength——fu,fyfu,fy,f(2)Plasticity——材料发生塑性变形而不断裂的性质(3)Coldbendingper
5、formance——钢材发生塑变时对产生裂纹的抵抗能力,是判别钢材塑性及冶金质量的综合指标。(4)Impacttoughness——动力指标,钢材在断裂或塑变时吸收能量的能力,是强度与塑性的综合表现。(5)Weldability(6)Durability注:承重结构的钢材至少应保证fu,fy,d三项指标满足要求。Key4:Factorsaffectingtheperformanceofsteel1)Theinfluenceofchemicalcomposition(化学成分)——C,Mn,Si,S(hotshortness),P(Coldshortness).(2)Theinfl
6、uenceofsteel-making(钢材生产过程)(3)Temperatureinfluence(温度)——HighandlowTemperature(4)Hardeninginfluence(硬化)——f↑,d↓,Akv↓(5)Theinfluenceofstressconcentration(应力集中)Key5:Fatigueofsteelstructure(1)疲劳破坏的特征:——脆性破坏(2)影响因素:构件和连接的构造类型循环次数循环应力比应力幅残余应力Key6:Typesofsteel(1)碳素结构钢:代表Q235(2)低合金高强度钢:代表Q345、Q390和Q42
7、0(3)钢材的牌号:例如:Q235A、Q235B和Q235C有何区别(4)型钢(profiledsteel):I-,H-,L-,T-,[-shape.第三章钢结构的连接Key1:Themaintypesofconnections(1)weldedconnections(焊缝连接)——手工电弧焊、焊条与钢材适应(2)boltconnections(螺栓连接)CommonBolts(refinedboltsandcrudebolt)High-strengthBolts(frictio