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1《交通工程学》习题解及复习材料习题2-1解:⑴小时交通量:hQ/2493195190210195201205220219232217208201辆⑵5min高峰流率:hQ/27845602325辆⑶15min高峰流率:hQ/26841560)220219232(15辆⑷15min高峰小时系数:929.04671249315PHF习题2-2解:已知:%26.131326.0082.03086.17082.086.1730,/h1500C,/d50000AADT3.13.11xKx辆辆设计小时交通量:hKAADTDHV/66301326.050000100辆车道数:42.4150066301CDHVn该道路需修6车道。注:此题5.0DK。如果6.0DK,3.5n。习题2-3解:1000606100Q辆/h2车头时距:6.31000/3600/3600Qhts/辆车头间距:206.36.3206.3tshVhm/辆车流密度:5020/1000/1000shK辆/km第一辆车通过时间:2.12024VSth习题2-4解:stntii5)3.56.47.44.53.59.42.51.58.47.40.52.50.59.41.58.4(1611161hkmsmtnsVniiS/72/2080100161hkmVnViit/16.726.1154161)9.673.786.767.669.675.732.696.700.756.760.722.690.725.736.700.75(1611161习题3-1解:已知:t东=2.0min,t西=2.0min,X东=29.0辆,Y东=1.5辆X西=28.6辆,Y西=1.0辆1、先计算向东行情况:3hkmtlvqYtthttYXq/67.66608.12min8.1525.75.10.2/5.451min/525.7225.16.28东东东东东东东西东西东辆辆2、再计算向西行情况:hkmtlvqYtthttYXq/27.6460867.12min867.15.70.10.2/450min/5.7220.10.29西西西西西西西东西东西辆辆习题3-4解:总停驶车辆数=28+25+38+33=124辆总延误=124×15=1860辆•s每辆停车的平均延误=总延误/停车辆数=1860/113=16.46s交叉口引道上每辆车的平均延误=总延误/引道上总交通量=1860/(113+119)=8.02s停车的百分数=停车辆数/引道上交通量=113/232=48.7%取置信度90%,则K2=2.70,于是停车百分比的容许误差=%07.11232487.070.2)487.01(取置信度95%,则K2=3.84,于是停车百分比的容许误差=%2.13232487.084.3)487.01(习题4-2解:已知:畅行速度hkmVf/82;阻塞密度kmKj/105辆;速度与密度为线性关系模型。⑴最大流量:因5.5221052jmKK辆/km412822fmVVkm/h∴5.2152415.52mmmVKQ辆/h。⑵此时所对应的车速:41mVVkm/h。4习题4-4解:已知:N=56,09.3561731Nfkmgjjj车辆到达数jk实测频数jfjjfk)(jkpNkpFjj)(012345678≥9∑011141195321056011283336251814801730.04550.14060.21720.22370.17280.10680.05500.02430.00940.00322.5487.87312.16312.5279.6775.9813.0801.3600.5250.180对于泊松分布,把jF小于5的进行合并,并成6组,可算出932.056145.56981.55677.99527.1211163.1214421.10112222226122NFfjjj由DF=6-2=4,取05.0,查表得:2205.0488.9可见此分布符合泊松分布。习题4-5解:已知:交通流属泊松分布,则车头时距为负指数分布。交通量hQ/1200辆,sQ/31360012003600辆。⑴车头时距st5的概率:19.035)5(etehP⑵车头时距st5时出现的次数:1353.036)6()5(ehPhP∴次数为:4.1621353.01200(辆/h)。⑶车头时距st5时车头间隔的平均植:车头时距jt频率频数此时段到达的车辆数jf61353.0)6(hP16246709697.0)7(hP1163380695.0)8(hP8323904978.0)9(hP601751003567.0)10(hP43121102556.0)11(hP3191201832.0)12(hP2261301312.0)13(hP165140094.0)14(hP1131500674.0)15(hP821600483.0)16(hP66∴平均值:444.8)166152143823733646(1621166Nftmjjj习题4-9解:已知:Q=1500辆/h,每个收费站服务量为600辆/h。1.按3个平行的M/M/1系统计算s/36536003/1500辆,s/613600600辆,1656/136/5,系统稳定。辆5)1(n,辆17.4nq,辆/36snd,辆/301sdw而对于三个收费站系统辆1535n,辆5.12317.4d,辆/36sd,辆/30sw2.按M/M/3系统计算s/12536001500辆,s/613600600辆256/112/5,16532/5N,系统稳定。04494.0625.15625.61)6/51(!3)25(!)25(1)0(2023kkkP辆5.3)6/51(04494.03!3)2/5(24q辆65.25.3qn辆/4.812/55.3sqw习题4-10解:已知:V1=50km/h,Q1=4200辆/h,V2=13km/h,Q2=3880辆/h,6V3=59km/h,Q3=1950辆/h,t=1.69h1.计算排队长度k1=Q1/V1=4200/50=84辆/km,k2=Q2/V2=3880/13=298.5辆/kmVw=(Q2–Q1)/(k2–k1)=(3880–4200)/(298.5–84)=–1.49km/hL=(0×1.69+1.49×1.69)/2=1.26km2.计算阻塞时间⑴排队消散时间t′排队车辆为:(Q1–Q2)×1.69=(4200–3880)×1.69=541辆疏散车辆数为:Q2–Q1=1950–3880=–1930辆/h则排队消散时间:hQQQQt28.0193054169.1)(2321'⑵阻塞时间:t=t′+1.69=0.28+1.69=1.97h习题5-1解:已知:dvehAADT/45000,大型车占总交通量的30%,6.0DK,12.0K,平原地形。查表5-3,7.1HVE8264.0)17.1(3.011)1(11HVHVHVEPf取设计速度为100km/h,二级服务水平,71.0)/(2CVhpcuCB/2000,0.1Wf,0.1Pf一条车道的设计通行能力:hvehfffNCVCCPHVWB/5.117318264.01171.02000)/(21车道数:5.526.012.05.11734500021001001DKKCAADTn故该高速公路修成6车道。习题5-2解:已知:L1=300m、R=0.286、VR=0.560、V=2500pcu/hL2=450m、R=0.200、VR=0.517、V=2900pcu/h第一段:计算非约束情况下的交织车速SW及非交织车速SnW7dcbRdnWWLNVVaSS/)/()1()3048.0(147.801.24或非约束情况下型式B的常数值如下:abcdSW0.11.20.770.5SnW0.022.01.420.95hkmSW/08.74750/)3/2500()56.01()3048.0(1.0147.801.245.077.02.15.0hkmSnW/15.81750/)3/2500()56.01()3048.0(02.0147.801.2495.042.1295.0利用式(5-8)计算5.349.1)]08.7415.81(011.0)750/57.71(56.0703.0085.0[3)](011.0)/57.71(703.0085.0[maxWWnWRWNSSLVNN核查交织区段诸限制值:30001400WV,19003.8333/2500/NV,8.056.0RV5.0286.0R,760750L确定服务水平:查表5-10hkmSW/8008.74,属于二级,hkmSnW/8617.81,属于二级。第二段:计算非约束情况下的交织车速SW及非交织车速SnWhkmSW/51.67450/)3/2900()517.01()3048.0(1.0147.801.245.077.02.15.0hkmSnW/34.69450/)3/2900()517.01()3048.0(02.0147.801.2495.042.1295.0利用式(5-8)计算5.376.1)]51.6734.69(011.0)450/57.71(517.0703.0085.0[3)](011.0)/57.71(703.0085.0[maxWWnWRWNSSLVNN核查交织区段诸限制值:30001500WV,190067.9663/2900/NV,8.0517.0RV5.0200.0R,760450L确定服务水平:查表5-10hkmSW/7251.67,属于三级,8hkmSnW/7734.69,属于三级。习题5-3北解:已知T=60s,三相式固定周期。大车﹕小车=2﹕8,βl=0.1。由题意分析可知,交叉口各进口道的车行道区分为专用左转和直右两种。西东⑴计算直行车道的设计通行能力,用公式(5-23)。取t0=2.3s,φ=0.9。绿灯时间tg=(60-2×3)/3=18s。据车种比例2﹕8,查表5-32,得ti=2.65s。将已知参数代入公式(5-23),则南hpcutttTCigs/3749.0)165.23.218(603600)1(36000⑵计算直右车道的设计通行能力,用公式(5-24):hpcuCCssr/374⑶各进口属于设有专用左转车道而未设右转专用车道类型,其设计通行能力用公式(5-30)计算:hpcuCCClsrsel/831)1.01/()374374()1/()(⑷该进口专用左转车道的设计通行能力,用公式(5-31)计算:hpcuCClell/831.0831⑸验算是否需要折减因T=60s,所以n=3600/60=60,不影响对面直行车辆行驶的左转交通量:hpcuCle/240604本题进口设计左转交通量hpcuChpcuCClelle/240/
本文标题:《交通工程学》习题答案及复习资料
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