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1、桁架梁侧向稳定计算3?9(?+?,147?9)2004?6?020?%RRnD?EASTCHINAHIGHWAYNo.3(TotalNo.147)June2004?.%?:1001R?7291(2004)03R?(0053R?05?Z?2?3:B?S?Py?N?-?b(?3?(D?f?5R?239000)?:?Ok?y?N?-?!?S?D?A?R=?S?R?i?1?Dy?N?-?S?o?E?R?g?7R?S?6R”8(?#?%?O?R?Ri?x?8(R?R?/?y?N?-?W?-?6?W?y?S?<%?18(D?Z?:?O?;y?N?-?Ok?D?A?R=y?S?e?I?y?D?2Rb?
2、.?S?R=R?x?I?83?(?83?E?y?q8(?e.?y?RXRb?y?DgO)?1?DR?i?N?-?SRA?#R”?6OJ?!?i?S?i?RCRE?#R”?6?SRE?#R”?6?/?S?R”?6?8(?%?y?83?(?E?!?SR?y?/?S?S?45cm?/?H?SR?(?H?S?R”?R?%?R?RE83RA?#y?NOJ?%?%?O?S?!?J?D?RA?SD?y?NOJ?R?Qy?H8(?fR?y?e?y?RX?83?(?E?!?S?y?N?-?SRT?1?Dy?N?-?S?h?R?%?9?8(?N?y?RA?S?/?W?8(?R?RERA?/?<?S?#?O?
3、(?.%?O?)?RX?/?2?R?ho9II!R?R?F1?iR?5Y4h?0;?RXl?/?S?R=?6?R=?/?X?H?S?1R?a)?f?X8(?R=?/?RXM,=F114,?/?/?RX0o?/?RXR6?SRE?#?%?O?R?/?R6?S?R=%?O?RXN,o?f?X8(?R=?/?MZ=?i?S?/?/?RX8(8(?/?RX/5e5e.R?(5l?(5a5eR?85l5a838383J5l5n/5aR?5nJ5a5n/?QR?B?SRE?#?%?O?R?R?B?%?%.?S?R=%?O?RXNZoFlIV83=R?R34h?/?%?9y?RA?S?1-b)RE?#%?R
4、?Ay?Rm?/?%?#8(?Q?O?%?S?RXl?SR?%?R?%?#?S?k?r?9:y?9:2003?09R?22R?%?R?3R?t54R?%RRnD?2004?,3?9?Pk?HPk?HPPR?83%>)2Pidx%?xR?NidxR?x-/N2Nz6(c)?3?RE%?O?q?X?HD?Rb?<%?O?RX21?Rm?/%?#Rb?<O?S?S?%?R?RX21?%?#?S?2R?a)?S?Ay?RX1?R?SO?R?%?#?S?2-b)?f?X8(%?z?%?#RE?%?O?P8(?D?(1,/l)2QT?C?S?I?q?%?O?x?S?2R?8()?f?X8
5、(?/?RE?#?/?.?-?S%?R?I?%?%?Rm?/?%?#?<?-?8(?%?R?IR?%?R?%?#?<?-?8(?/?y?R?/?!?8(1?/?y?N?-?1.1.?/?R=?6?R=?RE?R=?N%?O?R?N,?X?S?dx?1?D?N%?O?dN?S?3R?a)8(O?RXN?S?S%?R?I?%?O?/%?#?<?-?8(?3R?a)1.2?/?6?1?y?RE?R=?N%?O?RXN2,?S?2R?b)oP=N,/3?Rm?f?X8(%?O?%?%.?RX?N,?SN5nR?dTX+Ns?dR?1?D?%?O?dN=R?R?z?83R?_N21,(
6、R?dx)Z?832R?x?S?d?IR?q?%?O?%?R?%?#?S?dp=R?dN2?0x3x14dN=rl2R?x3x_R?f=IR?_:R?dxR?R?R”jo5a?S2?IR?S%?R?%?#?S?%?O?dp83R?(l)2d?SR?zdx5e=fJLl3xZdxaR?%?R6?%?%.?RE?#?N%?O?%?1?y?SRE?#?R=?!%?O?NZ%?R?I?%?O?RXNZ/2?Rm?/%?#?<?-?8(?R=?1?D?Sy?RA?SRE?#y?RXRm?/?%?#?S?%?O?RX?xN,?R=?!%?N2%?SR?S22004?,3?9?b?S?5R?:?y?N
7、?-?1.3?6?R=?/?RA?#?%?O?%?%.?S?/?R=?6?R=?D?R?d8(?S?)?S%?R?RA?#?%?O?N,?IR?S%?R?%?#?S?%?O?RXN,13.1.4?1?y?/?RXg12/2?S?RA?#%?O?RX?08(?#RX10#?S?#83?#RX8#?S?i?i?4?f?X8(2.1?#?X?1?D?Qy?D?D?O?S?R=?6F=1.2x500=600kN?S?y?R?R=?R?9?/?M,?O)RA?#?%?O?S?3R?8()?f?XFl600x39?S8(?SD?S83?SM.=?=R?=5850kN?m44RE83RA?#R=?h=1.5
8、m?SRE?R=?N%?O?M,5850_183?SjV8(=R?R?.=R?R?-?SR?-=3JVIIh?dx?1?D?%?O?dNo?1?%7?%?q?=18.5kN/m?S?R=?/?MZdN=-gxdxh?I?%?O?83=?R?8o8.5x392=3517.3kN.m?o?oRE?#?R=?N%?O?;5aR?h?RE2R?dp=(lZx)ZgxdxMZ31.5=2344.9kN?m8(R?n12R?P5nlhJ05aR?5a)xdx=12hR?6?R?i?N?!?Ix?i?WxO)OMRXIx=24x198.3+24x12.75x(150/2)5l%?1?RA?#%?O?Ns?S
9、%?R?IR?SR?%?#?<?-?S?%?O?RXN2/6o?R=?1?D?Sy?S%?R?I?%?O?8(Wx=172466017246607523000cm3P=150:150l?Sd8SR?_?R?lD?83R?lR?a=450?D?8IR?RAR?SR?8383R?R?R?R?-?83?R6RAR?R?%?R?RA?JRXr1.R?l?O?RM183O?18383.R?S.lR?R?l?SlR?l!ll?1?D?#?3.6cm?S?6?O>?7=0.509?SD?/?MM=,qWx?S8T=0.809x23000x103x273=l.06x100N?mm=106000kN
10、?m>M,+R?=9367.3kN?m?4?i?i?X?02?y?R?39m?S?E?500kN?e?I?/?RXy?S?R?X?y?N?-?8(?5nR6?%?j5e?O?X?e?S?I?S?4?f?X8(?e?O?X?#R?Q?RX16?82.2?8(?O?S%?O?%?/?O?8Y?S8o=273MPa,?5?y?N?-?%?%?R?X?y?N?-?R=?RC?1?y?RA?SRE?#?%?O?-56R?%RRnD?2004?,3?9?IRm?/?#R?%?O?x8(_NR?39002344.9PR?R?+_+?R?R?R?R?R?R?R?2472.5kN35l2R?35l2R?5
11、l-R?-R?y?R6?%?RE?s?I?y%?S?y?4?%?O?RXR?O)R”R?S?5?f?X8(y?N?-?6?s?H%?%?R?8(?s?H%?%?R?/?RX12?z10”?SA8(R?12.74cm2,r,=15.6cm.?S?3”?<75835,39R?1.5?S8(8(=-R?R?R?%?R?R?R?XofD?8T3918.5x39+5YR?937.7kN?*?%?O?(?6)?#%?O?N=RR?937.7kN?S?#RX16?88#?9.52cmrmi8(R?1.D?y?70cm,?SAR?1=0.9x70=6318cm?Scm63rm;1.18=53.4A,y=
12、7.367cm?Srmin=1.A=1yR?x12.74=15250.88cmocm2cmx25.6+2x4x12.74x75=573607cm0R=0.818D?%?O?8SNN=0.818x6x9.25x102x273R?1275600NR?1275.6kN>NR?937.7kN?#%?O?NiR?Rsin450=937.7x0.707=663.1kN?SD?y?70R2R?99cm?S?l=l2l28(?=573607A152.88=61.5eR?A?SR?ry3900?S._=61.25R?8(j?5aR?by?%?O?8IP0.9X99=89R?69.9cm891.18N=75
13、.48E?18A?17,R=0.705?SDPR?8I?S8oR?0.705x12x12.74x102x273=2.94x106N=2940kNrminR=R?0.66D?%?O?N=0.66x6x9.25x102x273=1.029x106N=1029kN>N,=633.1kN>2R?2472.5=1236.3kN1500?b?Q0?!?8(?1?S?16?8?Ok?I?s?H%?%?R?S?O?O?QR?34AR?348310R?283128312.74R?52kN?S?%?O?DDR?Q=52R?73.6kNnsina1xsin450%?83IR?l=?R?R3R?R?106
14、cm1061.50=70.78I8(8T?8E?18A?16,0R?0.789,?D?%?O?8Y0,PR?150MPa?SD?%?O?6?#?X?H2.4O?X?#?WO?O?O?X?#RC?e?#?M36?W?S?W?Q?RX16?8?SD?O?O?8I%?=208MPa,?x8T=?8Y?S8o=0.789x7.367x102x=87188N=87.188kN2.3?#?W?1?RX?3m2%?S?acm?Q?O?150>D=73.6kN?%?SN=?%?W?O?O?saI?R=?F=600kN?S?/?L,=1.5m,?HR=I5aR?%?i?!?S11724660x104mm4
15、=150724660en8NR?9R?18.5kN/m?S?/?%?O?R;R?1-1,83;+?1ZQ?!O?O?SQ=,RR?937.7kNS5YO?X?#?i?R=?SS=2004?,3?9?b?S?5R?:?y?N?-?R?57R?12x12.74x8012230.4x103=12230.4mm3?SN=937.7x103x12230.4x103x150x101724660x100R?SrClesesesJ9.97x103NO?O2?i?SA=6xTrd2/4R?61.07D?O?O?R?9.97x1yH61.R?x1?R?163.0MPa<=2018MPaR?R?N-A83R?
16、eer2.5?5?2.5.1?z?!%?5?R?o?RT%?T?z?!%?S?/?R=R?9?5?D?l?S?R?R?e?RX?%?j?S%?D?H(1)D?:R?0.3556(n2R?1)/8(1)?HR=n-?S?,y?n=13oD?:=0.3556(13?SR?1)R?7.5cm2.5.2?z?!%?5?z?!%?R=?5?D?=D?S+?=7.5+24.05=31.55cm3?<y?N?-?8(?R?/?6?<?8(?1?R=?R=?D?Sy?RA?SD?R=?#%?O?O)OMRXN2?N?S?S%?R?IRC?S?Rm?/?#?83?%?O?RXN,/3+NZ/28(?
17、R?S?1?R=?D?Sy?RA?SD?#%?O?O)OMRXN2?N,?S%?R?IR?S%?R?%?#?S?%?O?RXR?/6+N1/30?1?R?!?rrsm.aA2R?rxR?%?kcm-)kcm)kcm)?cm)?Yem)tcm)?Ycm)?#2R?11025.48396.679.43.95827945.7?#1R?189.539924.83.2112.84.91.19?2?D?y?!?5D?y?!W(cm3)3578.57699.17157.115398.310735.623097.414817.930641.722226.845962.6j(om0)%?%?j83=(?)8Yl
18、+(tg?S+ctO)R?8o%?%?jR6?%?j83(1.6;R?8(.335?)h%?%?j?HR=1-?S39m=39x1000mm;h,-C?/?4?its?S1500mm;015Y?#?S?#?z?S450;E-?Q?z?!?B?S2.1x105MPa;F5Y?R=?R=?S600kN;95Y?%?1?S18.5kN/m=18.5N/mm;I-?i?!?S2x1724660x104mm4;h-?S1.5mR?1500mm8(600x103x393x10003J?8oR?CR2R3R?R?R?xtR?-?Z?R?.-?S?R?R?S5nR?VR?5YR?R?R?R3+5a48x2.1
19、x10x2x1724660x104R6?%?jRTO?XO?XRTO?XO?XRTO?XO?XRTO?XO?XRTO?XO?X250497.2577434.4500994.41154868.8751491.61732303.22148588.84596255.23222883.26894390?:?R=?QsRX%>?R”Qs?SD?R?2?3?O?-?S-?S.?S?D?O?RTO?X?O?X?%?%?R6?%?R6?%?%?R6?%?R6?%?j%?j%?j%?j%?j%?j%?j%?j%?j%?j4%(1N?R?)788.21576.42246.43265.44653.21687.
20、53375.04809.46750.09618.8O?O?(V)245.2?.5698.9?5698.9245.2490.5698.9490.5698?:?R=?QsRX%>?R”Qs?SD?R?2R?1?ZjR_5x1?8.5x394x10004384x2.1x105x2x1724660R?x104)8Y5a+(?S5a?S8(+?S?S?S8()x1500x390008T(1.61R?0.33515001500=24.05cm1?SOa?<?9?.?.?2?H?J?Yy?”D?.%tR?:R?NR?JD?p?S2003,3.28oR?J?,R?D?A?f?.D?”D?.%tR?:R?NR?JD?p?S1988,1.38TD?RJ?R+?.?1.%tR?:R?NR?JD?p?S1995?S1.?+?5?D?
