《考虑端部约束效应的钢管约束混凝土柱耐火验算、采用非膨胀型钢结构防火涂料时钢管约束混凝土柱的防火保护层厚度.docx》由会员分享，可在线阅读，更多相关《考虑端部约束效应的钢管约束混凝土柱耐火验算、采用非膨胀型钢结构防火涂料时钢管约束混凝土柱的防火保护层厚度.docx（38页珍藏版）》请在三一办公上搜索。
1、附录A考虑端部约束效应的钢管约束混凝土柱耐火验算A.0.1进行端部约束钢管约束混凝土柱的耐火验算，可依据图A.0.1所示的流程图执行。设置初始升温时间高温下钢管、钢筋、 混凝土的强度和弹 性模量火灾下构件的截面轴 压承载力Nuj考虑转动约束影响的 稳定系数为钢管温度7；,钢筋温度”，混 凝土截面等效温度,3、7cq输入截面尺寸。，长细比2,荷载比 ”,含钢率&，材料强度，轴向约束 刚度比,转动约束刚度比成等火灾下构件的轴心受 压承载力%考虑轴向约束影响的 临界轴力比nf大温间增升时图A.0.1端部约束钢管约束混凝土柱耐火验算流程图A.0.2火灾下考虑端部轴向约束作用的钢管约束混凝土柱轴力比可按
2、下列公式计算:H1=n-(3.6-0.047)am1%=%+-1+(A.0.2-1)(A.0.2-2)(A.0.2-3)(A.0.2-4)(A.0.2-5)(A.0.2-6)式中：Hf火灾下考虑端部轴向约束作用的钢管约束混凝土柱轴力比;火灾下作用在柱上的荷载比；A构件长细比；a一框架结构中机-1层上部结构对钢管约束混凝土柱产生的轴向约束m刚度比；ai一框架结构中m-2层上部结构对钢管约束混凝土柱产生的轴向约束刚度比；%多层框架顶层或单层框架中钢管约束混凝土柱的轴向约束刚度比；&单层框架结构中相邻构件对钢管约束混凝土柱产生的轴向约束刚度(N/m)；a与钢管约束混凝土柱相连的梁的数目；小与钢管约束
3、混凝土柱相连的第j根梁产生的轴向约束刚度(N/m)；与钢管约束混凝土柱相连的第/根梁的抗弯刚度(Nm2);%与钢管约束混凝土柱相连的第/根梁的跨度(m)；腹一常温下钢管约束混凝土柱的轴压线刚度(N/m)；EA常温下钢管约束混凝土柱的轴压刚度(N)；L钢管约束混凝土柱的长度(m)。A.0.3若火灾仅发生在钢管约束混凝土框架结构的某一层内，当火灾下钢管约束混凝土柱的端部轴向约束刚度与常温下柱端轴向约束刚度的比值不低于90%,即结构层数满足表A.0.3中要求时，可不考虑周围构件约束刚度的变化。表A.0.3忽略梁刚度折减对钢管约束混凝土柱轴向约束影响的结构最小层数a1折减20%折减40%CZ1折减60
4、%折减80%0.00224680.00424680.00624690.00824690.01246100.015247130.02247一0.025248一0.0324110.035240.04240.04524一0.0525一0.0625一0.07260.08280.0920.12一附录B采用非膨胀型钢结构防火涂料时钢管约束混凝土柱的防火保护层厚度8.1 圆形钢管约束混凝土柱8.1.1 设计耐火极限为2.5h、3h和4h的圆形钢管约束混凝土柱，所需的非膨胀型钢结构防火涂料最小厚度计算值可分别依据表B.1.1-1、表B.1.1-2和表B.1.1-3选取，表中未给出的防火涂料厚度可采用线性插值方
5、法确定。B.1.2若表B.1.1-1、表B.1.1-2和表B.1.1-3中的防火涂料厚度计算值小于现行国家标准钢结构防火涂料GB14907规定的最小厚度，应按后者进行设计。表耐火等级为2.5h时非膨胀型钢结构防火涂料最小厚度计算值(mm)截面直径(mm)荷载比偏心率钢管钢材牌号和混凝土强度等级Q235Q355Q420C30C40C50C60C30C40C50C60C30C40C50C604000.302222322233330.544435544555516677777777770.405555555566660.566667777777718889888888880.507777777788
6、880.58888888888991IO10Il1110IO101110IO10100.60999999101091010100.510111111101111111011111111213141512121314121213130.701213131412131314121313140.514151516131415151314151511618202215161819151617180.801821232618202224182021230.521252933202225291922242712737455123283541212631376000.300000100011100.5110
7、02221322215444555465550.402222433344330.444455545555OOOOOOOOOOOOOOOOOItl【ZlSlLSl，【I8O008UclUIl1clClH【1ZIISOIlIlIlOlHIlUOlUIlIlOlOOIOIOIOIOIOIOIOIOIOIOIOIILO666866886888,o888888888LLLO888888888888I9OLLLLLLLL9999SO999999999999O999L999L9999IgOgqq9qqqqqqgOGgtvSt7vOg9gS9SgItOPtVVZSOZZ1Z1lI,OPP包vtIZ包IOOI1
8、OOIZOOOOgOOOOOOOOOOOOO618191OZ81L91ZZZOZLI8O91SlL91Sl81L91SOtl【11SlW1OZIZlZII1ZlUZl【1lZIILOIIOlOIOIIIOlOIOIIIOlOIOIgOOI66666666666O66666666Ol666I9O888888888888OLLLLLLLLLLLLOL888LL88LLLLIgO999999999999gOS999SGG9GggGO999L99999999IG30.500001000100013210433244330.401100221122210.5221143324333I4444554455
9、540.503333444344440.544445554555515555665566650.605555555565550.566556666666617777777777770.706666777777770.577777777777718899888888880.80999109999999100.51010IO111010IOIO1010IO10I11121213111112121111111212000.300000000000000.500000000100012100432143320.401000211022110.521103222332214433444454440.50
10、3222433344330.544334444444415555555555550.604444555555550.5555555555555I6666666666660.706666666666660.566667777777717778888788870.808888888888880.5999999999999I10101111101010101010101014000.300000000000000.500000000000012I00322143220.400000110021100.511003221322214333444344430.502221333243330.543334
11、443444415444554455540.604444444454440.555445555555516555665566650.705555655566650.566666666666617777777777770.807777777777770.58888888888881999109999999916000.300000000000000.5000000000000120003210332I0.400000100011000.510002210322113322443344330.502211332233320.533324333443314444544454440.604433444
12、444440.544445444554415555555555550.705555555555550.555556655666516666666666660.806777777777770.5777777777777188898888888818000.300000000000000.5000000000000I2000321033210.400000100010000.510002100321013321443344330.502110322233220.533223333433314443544454440.604333444344440.5444444445444155555555555
13、50.705444555555550.555555555655516666666666660.806666666666660.5777777777777188898888888820000.300000000000000.500000000000011000321032I00.400000000010000.5000021002210I3221333243330.011103221332250.532213333333314333444344440.603333443344430.544434444444414444554455540.704444544455440.5555455555555
14、15555665566550.806666666666660.56666666666661777777777777表B.1.1-2耐火等级为3h时非膨胀型钢结构防火涂料最小厚度计算值(mm)截面直径(mm)荷载比偏心率钢管钢材牌号和混凝土强度等级Q235Q355Q420C30C40C50C60C30C40C50C60C30C40C50C604000.303333444444440.555556666666618888988998890.406666777777770.5888888889988I1010101110101010101010100.509999999999990.51010IO1
15、01010IOIO1010111111213131412121313121212130.601111111211121212121212120.513131314131313141313131411516171815151617151516160.701516161715161617151616170.517181920171818191617181912022242719202223182021220.022252832222427302224262980.526313641242831362427303413445556228354351263239466000.3011002211222
16、10.5222133324333I6555766676660.404333544455540.555556666666617777887788880.506666777777770.5777788888888199999999109990.608888999999990.59999101010101010101011111121211111112111111110.701111111211111212111112120.5121313131213131312131313I1415161714151515141415150.801617181916161718161617180.51719212
17、2171819211718192012124273119212325192022248000.300000110021100.510002210322115432655465550.402222433344330.544335554555516666766677660.505555665566660.5666677667776I8777888888880.607777777787770.5888888888888199910101010910101090.709999991010101010100.5101010111010111110101111I1212131312121212121212
18、120.801313141413131414131314140.51415161614141516141415151161819211516171815161717100O0.300000100010000.500002100220014321544355430.402211322233220.533224433544415555665566650.504444555555550.555556665666617766777777770.606666776677770.577777777777718888988898880.708888888888880.59999999999991101011
19、1110101010101010100.801111121211111212111112120.5121213131212131312121213114151517131414151314141412000.300000000010000.500001000210013210443254430.402110222132220.532214432444315444655565550.504333544455440.555445555655516666766676660.606555666666660.566667666776617777887788870.707777777788870.5888
20、88888888819999999999990.801010101010101010101010100.5111111111011111110111111I12131314121212131212121214000.300000000000000.500001000100013210432244320.401100221132210.522104322433214444554455540.503332444344440.544445554555516555666566660.605555655566550.566656666666617766777777770.706666777777770.
21、577777777777718888888898880.809999999999990.510101010910101010101010111111212111111111111111116000.300000000000000.500000000100012100432144320.401000211022110.210032214322OOOOOOOOOOOOOO000366666666OIOl66I8O0081888888888888SO8888888888LLOLLLLLLLLLLLLILO999999999999O99999999Gg99O99999999999I9OgSSOggtgttP
