支撐系統(tǒng)強(qiáng)度及穩(wěn)定性驗(yàn)算

1、支撐系統(tǒng)強(qiáng)度及穩(wěn)定性驗(yàn)算按(GB5001Z2003鋼結(jié)構(gòu)設(shè)計(jì)規(guī)范5.2,21條，平面內(nèi)壓彎構(gòu)件穩(wěn)定性按下式計(jì)算:NmxMxf-"AN-xAxWx(10.8l)Nex、車(chē)站標(biāo)準(zhǔn)段鋼橫撐強(qiáng)度與穩(wěn)定性驗(yàn)算1、根據(jù)鋼支撐軸力計(jì)算，對(duì)軸力較大的第三道橫撐進(jìn)行驗(yàn)算，其軸力設(shè)計(jì)值為:N32368(KN)2、穩(wěn)定系數(shù)計(jì)算l0xuxl1.026.326.3(m)(d4d：)643.14(0.60940.5774)643,4、1.3110(m)(取()609,壁厚t=16mmix(d2d；)43.14(0.60920.5772)222.9810(m);:0.21；mx1.0;x1.15;26.30.21

2、125.24119.79xfy235按b類(lèi)查表,得:0.443、計(jì)算W1xW1x2Id1.31100.6093一4.3103(m3)Nex咨1.1x4154.94、計(jì)算NEx3.1422.11082.981021.1116.192_2_2Mz273.05(KNm)1.352.981078.526.3(2)鋼橫撐附加彎矩計(jì)算26.30.02630.02，取e0.02631000Mf23680.026362.28(KNm)故,MxMz273.0562.28335.33(KNm)6、強(qiáng)度及穩(wěn)定性驗(yàn)算(1)強(qiáng)度驗(yàn)算23682A2.98102335.331.154.310379463.1(KN/m2)6

3、7811.9(KN/m2)12147275.0(KN/m2)f215000(KN/m2),滿足規(guī)范要求。(2)穩(wěn)定性驗(yàn)算xAmxMxxW1x(10.哈)23681.0335.330.442.981021.154.303(10.8贏)305252.2(KN/m2)>f215000(KN/m2),不滿足規(guī)范要求，擬采用臨時(shí)立柱。7、對(duì)第三道支撐在基坑中部架設(shè)臨時(shí)立柱后進(jìn)行穩(wěn)定性檢算(1)穩(wěn)定系數(shù)計(jì)算l0xuxl1.013.1513.15(m)x工59.8923513.15x62.620.21按b類(lèi)查表，得:x0.810(2)計(jì)算構(gòu)件段范圍內(nèi)最大彎矩Mx自重產(chǎn)生的彎矩計(jì)算Mz68.26(KNm

4、)1.352.9810278.513.152813.1510000.013150.02，取ei0.020MfN3e23680.02047.36(KNm)故，MxMzMf62.6247.36115.62(KNm)(3)穩(wěn)定性驗(yàn)算2EA3.1422.11082.98102Ex亍214304.61.121.162.622xAmxMxNxWx(10.8)NEx23681.0115.620.8102.981031.154.310(10.8236814304.6)_2_2125053.6(KN/m)f215000(KN/m),滿足規(guī)范要求。二、車(chē)站標(biāo)段鋼斜撐強(qiáng)度與穩(wěn)定性驗(yàn)算1、其原理同上，對(duì)設(shè)計(jì)軸力較大、

5、最長(zhǎng)的第三道撐進(jìn)行驗(yàn)算。N32368.23348.4(KN)2、穩(wěn)定系數(shù)計(jì)算l0xuxl1.016.016.0(m)44(dd1)644_43.14(0.6090.577)643.4.1.3110(m)(暫取e609,壁厚t=16mm驗(yàn)算)22(dd1)4_223.14(0.6090.577)42.98102(m2);16.00.2176.190.730按b類(lèi)查表，得:W1x32I21.31100.609334.310(m)4、計(jì)算NExNex與1.1x3.14*22.11082.981021.172.88210560.55、計(jì)算構(gòu)件段范圍內(nèi)最大彎矩(1)自重產(chǎn)生的彎矩計(jì)算_21.352.981022Mz78.516.0101.1(KNm)(2)鋼橫撐附加彎矩計(jì)算600.0160.02，取ei0.021000MfN3e3348.40.0266.97(KNm)故，MxMzMf101.166.97168.1(KNm)6、強(qiáng)度及穩(wěn)定性驗(yàn)算(1)強(qiáng)度驗(yàn)算2112362.4(KN/m2)233993.9(KN/m2)N3348.42A2.9810-2168.11.154.310199464.3(KN/m)f215000(KN/m),滿足規(guī)范要求。12146365.3(KN/m2)f215000(KN/