ããæ¡¥æ¢æ½å·¥ä¸ç°æµæ¯æ¶ä½¿ç¨æ°éç计ç®æ¹æ³ï¼
ããä¸ãæ¯æ¶æ£ç®å¦ä¸ï¼
ãã1ã模æ¿æ¯æ¶æ£ç®ï¼æä¸ç±³æ¢é¿è®¡ç®ï¼é¢ç®¡æΦ48计ç®ï¼
ããï¼1ï¼é¢çç ¼æé¢å¦å¾â ï¼è·è½½æç
§å®½4.5米计ç®ï¼åé¿1ç±³çæ¢èªéN1=4.5Ã1Ã1Ã26=117ï¼KNï¼
ããï¼2ï¼æ¨¡æ¿è·è½½N2=4.5Ã1Ã0.018Ã9=0.729ï¼KNï¼
ããï¼3ï¼5Ã8æ¹æ¨è·è½½N3=4Ã0.05Ã0.1Ã4.5Ã7.5=0.675ï¼KNï¼
ããï¼4ï¼15Ã15æ¹æ¨è·è½½N4=8Ã1Ã0.152Ã7.5=1.35ï¼KNï¼
ããï¼5ï¼äººåæºå
·æ´»è½½N5=20ï¼KNï¼
ããå模æ¿æ¯æ¶ç«æçè½´åå设计å¼N=1.2Ãï¼117+0.729+0.675+1.35ï¼+1.4Ã20=154.315ï¼KNï¼
ãã模æ¿æ¯æ¶ç«æç计ç®é¿åº¦l0=æ¥è·1m+2Ã0.5=2m
ããé¿ç»æ¯Î»=l0/I=2/1.58=126.6
ããåè½´å¿åå件ç稳å®ç³»æ°Î¦=0.412ï¼f为é¢æçæå强度设计å¼=205Mpaï¼
ããAâ¥N/Φãf =154.315/ï¼0.412Ã205ï¼=18.27cm2
ããä¸æ ¹Î¦48é¢ç®¡çæªé¢ä¸ºï¼4.89cm2ï¼åä¸è¿°è·è½½éé¢ç®¡æ°=18.27/4.89 =4æ ¹
ããæ½å·¥ä¸éç¨@60Ã60çç¢å£èææ¶ï¼å
±è®¡16æ ¹ï¼æ»¡è¶³ä¸è¿°æ£ç®è¦æ±ã
ãã2ãç«æå°åºæ¿è½½å计ç®ï¼æ1.2ç±³æ¢é¿è®¡ç®ï¼é¢ç®¡æΦ48计ç®ï¼
ããå¹³åååPâ¤fg
ããP-ç«æåºç¡åºé¢çå¹³åååï¼P=N/Aï¼
ããN-ä¸é¨ç»æä¼ è³åºç¡é¡¶é¢çè½´åå设计å¼ï¼
ããAï¼åºç¡åºé¢é¢ç§¯ï¼
ããfgï¼å°åºæ¿è½½å设计å¼ã
ããï¼1ï¼é¢çç ¼è·è½½æç
§å®½4.5米计ç®ï¼åé¿1.2ç±³çæ¢N1=4.5Ã1.2Ã1Ã26=140.4ï¼KNï¼
ããï¼2ï¼æ¨¡æ¿è·è½½N2=4.5Ã1.2Ã0.018Ã9=0.8748ï¼KNï¼
ããï¼3ï¼5Ã8æ¹æ¨è·è½½N3=5Ã0.05Ã0.1Ã4.5Ã7.5=0.844ï¼KNï¼
ããï¼4ï¼15Ã15æ¹æ¨è·è½½N4=8Ã1.2Ã0.152Ã7.5=1.62ï¼KNï¼
ããï¼5ï¼é¢ç®¡èæç«æN5=9Ã2Ã6Ã3.84Ã10/1000=4.417ï¼KNï¼
ãã横æN6=12Ã2Ã6Ã3.84Ã10/1000=5.53ï¼KNï¼
ããï¼6ï¼æ½å·¥äººååæºå
·æ´»è½½N7=30ï¼KNï¼
ããN=1.2ï¼140.4+0.8748+0.844+1.62+4.417+5.53ï¼+1.4Ã30=226.42ï¼KNï¼
ããA=1.2Ã4.5=5.4m2
ããP=N/A=226.42/5.4=41.9KPaâ¤fg=120Kpa满足æ½å·¥è¦æ±
ããäºãé¨æ´çæ£ç®
ããé¨æ¶åºç¡éç¨C15é¢çæ··ååï¼å®½1000mmï¼é«1000mmï¼é¿20mï¼ç«¯å¤´ä¸ºæ¥åï¼Ð¤48mmé¢ç®¡ä½æ¯æ¶ï¼éç¨350å·¥åé¢ä½æ¢è·¨è¶åå¸éè·¯ï¼æ½å·¥æ¡¥æ¢ä¸é¨ï¼ç¡®ä¿åå¸äº¤éç
éï¼é¨æ¶å°ºå¯¸å»¶çºµæ¡¥å4.5ç±³ï¼é«4.5ç±³ã
ãã槽é¢æ£ç®
ããï¼1ï¼é¢çç ¼æé¢4.5m2ï¼æç®ææ¯ç±³åå¸è·è½½q1=26ï¼KN/mï¼
ããï¼2ï¼æ¨¡æ¿è·è½½q2=4.5Ã6Ã0.018Ã9/ï¼4.5Ã6ï¼=0.162ï¼KN/mï¼
ããï¼3ï¼5Ã8æ¹æ¨è·è½½q3=21Ã4.5Ã0.05Ã0.1Ã7.5/ï¼4.5Ã6ï¼=0.13ï¼KN/mï¼
ããï¼4ï¼15Ã15æ¹æ¨è·è½½q4=11Ã4.5Ã0.152Ã7.5/ï¼4.5Ã6ï¼=0.309ï¼KN/mï¼
ããï¼5ï¼äººåæºå
·æ´»è½½N5=4ï¼KN/mï¼
ããq=1.2ï¼26+0.612+0.13+0.309ï¼+1.4Ã4=38.06KN/m
ããMmax=ql2/8=38.06Ã36/8=171.27KN.m
ããW max=Mmax/[Ï]=171.27/170=1007.5cm3
ããè¥éç¨350å·¥åé¢ï¼æªé¢å¦å¾æ示åå
¶
ããæ¯æ§è·I350=5Ã3303/12+2Ãï¼170Ã103/12+1703Ã10ï¼=99760.2ã4
ããæ弯æªé¢ç³»æ°W350= I350/17.5=570.07cm3
ããW350/ W max=570.07/1007.5=0.567
ãã说æï¼56.7cmçæ¢çæ弯æªé¢ç³»æ°ä¸º570.07 cm3ï¼å³éç¨350å·¥åé¢å¯é¡¶é¿6米宽56.7cmçæ¢ã
ããæ¬æ¡¥æ½å·¥ä¸æ§½é¢é´è·ä¸º30cm.满足æ£ç®è¦æ±ã
温馨提示:答案为网友推荐,仅供参考