28米高桿燈強(qiáng)度符合國(guó)際計(jì)算書

28米高桿燈強(qiáng)度符合國(guó)際計(jì)算書橫向水平風(fēng)荷載產(chǎn)生的風(fēng)壓（一）、自然條件參數(shù)：10米高度風(fēng)速32M/S，最大風(fēng)壓0.6KN/M2。（二）、桿形結(jié)構(gòu)參數(shù)：燈桿：上口徑250mm；燈桿的橫斷截面形狀：16邊形。燈桿：下口徑650mm；燈桿高：27m。燈盤迎風(fēng)面積：0.2M2；單個(gè)燈具迎風(fēng)面積：0.3 M2。燈桿迎風(fēng)面積：19.3M2；燈具9個(gè)。公式：=zszl。公式中：作用在高桿結(jié)構(gòu)單位面積上的風(fēng)荷載 ：基本風(fēng)壓KN/M2； s：風(fēng)載體型系數(shù)z：Z高度處的高度變化系數(shù)l：重觀調(diào)整系數(shù)z：Z高度處的風(fēng)振系數(shù)1、基本風(fēng)壓：根據(jù)當(dāng)?shù)貧庀髼l件：離地10米高處風(fēng)速32m/s，基本風(fēng)2、風(fēng)載體型系數(shù)：燈桿為16邊形按照GBJ130-90標(biāo)準(zhǔn)，s=1.13、風(fēng)壓高度變化系數(shù)：按B類，即田野空曠系數(shù)取風(fēng)壓高度變化系數(shù)：表1高度（m）變化系數(shù)高度（m）變化系數(shù)27 1.36913.5 1.09826.5 1.36113 1.08426 1.35212.5 1.0725.5 1.34412 1.05625 1.33511.5 1.04224.5 1.32711 1.02824 1.31810.5 1.01423.5 1.3110 123 1.3019.5 0.81822.5 1.2939 0.9622 1.2848.5 0.9421.5 1.2768 0.9221 1.2677.5 0.920.5 1.2597 0.920 1.256.5 0.8619.5 1.2396 0.8419 1.2285.5 0.8218.5 1.2065 0.818 1.2064.5 0.817.5 1.1954 0.817 1.1813.5 0.816.5 1.1733 0.816 1.1622.5 0.815.5 1.1512 0.815 1.141.5 0.814.5 1.1261 0.814 1.1120.5 0.80. 0.81、風(fēng)振系數(shù)公式：z =1+1 2。公式中：zZ高度的風(fēng)振系數(shù) 脈動(dòng)增大系數(shù)1脈動(dòng)和高度系數(shù)2振型，結(jié)構(gòu)外形影響系數(shù)（1）、燈桿的自振周期對(duì)于基本振周期T10.25s時(shí)，應(yīng)采用風(fēng)振系數(shù)來考慮風(fēng)壓脈動(dòng)的影響，本高桿燈配單側(cè)照明燈盤，計(jì)算可考慮按單水箱搭的自振周期公式來進(jìn)行計(jì)算： 公式：T1=3.63sqr（H3/）（E1）（M+0.236P.AH）公式中 H：燈桿的高度m A：燈桿的橫截面M2 m：燈桿高度為H時(shí)桿體的質(zhì)量 I：橫截面慣性矩m4 P：燈桿的密度 750kg m4E：彈性模量 2E+1 1PaA：3.14（D2-（D-t）-2）/4A：0.01612704 m2 I：0.05（D2t）4 I：0.00084688/ m4燈桿的自振周期為T1=1.715613693（2）、脈動(dòng)增大系數(shù)脈動(dòng)增大系數(shù)根據(jù)。t14來選取，即1.78KNS2/ m2（3）、脈動(dòng)系數(shù)和風(fēng)壓高度系數(shù)（振型結(jié)構(gòu)外形系數(shù)另表2）高度系數(shù)風(fēng)振系數(shù)高度系數(shù)風(fēng)振系數(shù)270.6021.8613.50.68851.68326.50.6041.85130.6931.678260.6061.8612.50.69751.53325.50.6081.844120.7021.537250.611.83611.50.70651.54124.50.6121.838110.7111.544240.6141.83110.50.71551.54723.50.6161.833100.721.551230.6181.8369.50.721.55122.50.621.83890.721.397220.6221.8198.50.721.39721.50.6241.81180.721.397210.6261.8027.50.721.39720.50.6281.79370.721.397200.631.7626.580.721.39719.50.63451.74560.721.269190.6391.7515.50.721.26918.50.63451.75550.721.269180.6481.7614.50.721.26917.50.65251.76640.721.269170.6571.7713.50.721.26916.50.66151.77730.721.269160.6661.6522.50.721.41415.50.67051.65620.721.414150.6751.6611.50.721.41414.50.671.66510.721.414140.6841.6690.50.721.41400.721.414表2：振型結(jié)構(gòu)外形影響系數(shù)此系數(shù)只考慮燈桿的結(jié)構(gòu)尺寸，查GBJ135-90相對(duì)高度/高度相對(duì)口徑/口徑高度結(jié)構(gòu)系數(shù)相對(duì)高度/高度相對(duì)口徑/口徑高度結(jié)構(gòu)系數(shù)10.47270.80.50.7413.50.550.980.4826.50.790.480.75130.550.970.49260.7950.470.7612.50.430.950.525.50.780.440.77120.430.930.51250.770.430.7811.50.430.910.5224.50.770.410.79110.430.890.53240.760.390.810.50.430.870.5423.50.760.370.81100.430.850.55230.760.350.829.50.430.830.5622.50.760.330.8390.310.810.57220.740.310.848.50.310.810.5821.50.730.30.8580.310.80.59210.720.280.867.50.310.780.620.50.710.260.8770.310.740.61200.680.240.886.50.210.720.6219.50.660.220.8960.210.70.63190.660.20.95.50.210.690.6418.50.660.190.9150.210.670.65180.660.170.924.50.210.650.6617.50.660.150.9340.210.630.67170.660.130.943.50.210.610.6816.50.660.110.9530.210.60.69160.550.090.962.50.110.570.715.50.550.070.9720.110.560.81150.550.050.981.50.110.540.7214.50.550.040.9910.110.520.73140.550.0210.50.110100.115、重視調(diào)整系數(shù)r=1.1每0.5米高度上的受力情況燈桿高度（m）迎風(fēng)面積（）風(fēng)壓每段受力（KN）各段彎矩M(KNm)2732.4057.215194.8126.50.1451.8270.2657.02260.1481.8250.2707.0225.50.1511.7990.2726.93250.1541.7790.2746.8524.50.1571.7710.2786.81240.161.7520.2806.7323.50.1631.7430.2846.68230.1661.7340.2886.6222.50.171.7250.2936.60220.1731.6950.2936.4521.50.1761.6770.2956.35210.1791.6570.2976.2320.50.1821.6380.2983.11200.1851.5990.2965.9219.50.1881.5690.2955.75190.1911.5610.2985.6618.50.1941.5510.3015.57180.1971.5410.3045.4617.50.21.5320.3065.36170.2031.5220.3095.2516.50.2061.5310.3155.20160.2091.3940.2914.6615.50.2131.3840.2954.57150.2161.3750.2974.4614.50.2191.3610.2984.32140.2221.3470.2994.1913.50.2251.3420.3024.08130.0081.3210.0110.1412.50.2311.1910.2753.44120.2341.1780.2763.3111.50.2371.1660.2763.18110.241.1520.2763.0410.50.2431.1390.2772.91100.2461.1260.2772.779.50.2490.9210.2292.1890.2520.9740.2452.218.50.2560.9530.2442.0780.2590.9330.2421.937.50.2620.9130.2391.7970.2650.8930.2371.666.50.2680.8720.2341.5260.2710.7740.2101.265.50.2740.7550.2071.1450.2770.7370.2041.024.50.280.7370.2060.9340.2830.7370.2090.833.50.2860.7370.2110.7430.2890.7370.2130.642.50.2920.6630.1940.4820.2950.6630.1960.391.50.2990.6630.1980.3010.3020.6630.2000.200.50.3050.6630.2020.1000.3080.6630.2040.00三、燈桿合計(jì)彎矩為379.428K