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1、1钢结构基本原理复习DesignPrinciplesofSteelStructureDesignPrinciplesofSteelStructure1SummarizeKey1: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
2、作方便，施工快速）(4)Goodleakproofness（密闭性好）(5)Heat-resistantbutnotrefractory（耐热不耐火）(6)Becorrodedeasily,maintainedcostly（易腐蚀，维修费用大）ThestructurallimitstateKey2:TheDesignMethodofSteelStructurea.Theultimatelimitstates:Thebasiccombinationofloadeffectsshallbeconsideredand,ifnecessar
3、y,theaccidentalcombinationofloadeffectsshallalsobeconsidered.b.Theserviceabilitylimitstate:Theloadstandardcombinationofsteelstructuredesignisonlyconsidered.DesignPrinciplesofSteelStructure1Summarize(1)Higherfyandfu（有较高的fy和fu）(2)GoodPlasticityandimpacttoughness（有良好的塑性和冲
4、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）DesignPrinciplesofSteelStructure2steelmaterialKey1:TherequirementsofsteelstructurematerialKey2:Failuremodesofsteelstructurematerial(1)Plasticfailure(塑性破坏)Thereisobviousdeformationorco
5、llapseomenbeforefailure.(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。DesignPrinciplesofSteelStructure2steelmaterialDesignPrinciplesofSteelStructure2steelmaterialKey3:Themainmechanicalproperties
6、ofsteel(1)Strength——fu,fyfu,fy,f(2)Plasticity——材料发生塑性变形而不断裂的性质(3)Coldbendingperformance——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:Factorsaffectingtheperforman
7、ceofsteel(1)Theinfluenceofchemicalcomposition(化学成分)——C,Mn,Si,S(hotshortness),P(Coldshortness).(2)Theinfluenceofsteel-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)DesignPri
8、nciplesofSteelStructure2steelmaterialKey5:FatigueofsteelstructureDesignPrinciplesofSteelStructure2steelmaterial(1)疲劳破
