用力矩分配法的計(jì)算連續(xù)梁和無(wú)節(jié)點(diǎn)線位移剛架

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1、8.3用力矩分配法計(jì)算連續(xù)梁和無(wú)節(jié)點(diǎn)線位移的剛架--------多結(jié)點(diǎn)力矩分配例1:繪內(nèi)力圖解:1.固定B、C節(jié)點(diǎn),計(jì)算固端彎矩分配傳遞0.5710.4290.5710.4290150-100100000-28.60-6.101.8-0.8-1.00140-14040.3-40.30-57.1-42.9-12.2-9.23.52.62.放松節(jié)點(diǎn),計(jì)算分配系數(shù)對(duì)B節(jié)點(diǎn):對(duì)C節(jié)點(diǎn):3.依次放松各節(jié)點(diǎn),使彎矩平衡(見(jiàn)上表)14040.3M4.繪內(nèi)力圖分配傳遞0.5710.4290.5710.4290150-10010000-57.1-42.90-28.6-12.2-9.20-6

2、.13.52.601.8-0.8-1.00140-14040.3-40.3040.3M作剪力圖:140Q467469.9750.034.03例2：試求作圖示連續(xù)梁的M圖。EI等于常數(shù)，l1=6m,l2=5m，P=1000kN。（只計(jì)算二輪）解:1.固定B、C、D節(jié)點(diǎn),計(jì)算固端彎矩2.放松節(jié)點(diǎn),計(jì)算分配系數(shù)對(duì)B節(jié)點(diǎn):對(duì)C節(jié)點(diǎn):對(duì)D節(jié)點(diǎn):2060.821908.22683.56678.763910.59-3000-15001500-3000-938-56221188821059-882-281-469-389-389-194.5-194.5121.5672.9460.7836

3、.47137.3257.1854-45.24-45.24-28.59-1908.22683.56-683.56,-678.77678.76,2060.82-2060.82,-3910.59分配傳遞3.依次放松各節(jié)點(diǎn),使彎矩平衡(見(jiàn)下表)4.繪內(nèi)力圖練習(xí)：力矩分配法計(jì)算圖示連續(xù)梁，作彎矩圖。作業(yè)：P2741,2,5