æ¿è½½å计ç®ã
C30æ¿ååå
ï¼ä¸ï¼éç»è®¡æ¹æ³ââç¨äºè¯åç»æ°nâ¤9ç»æ¶
mfcuâ¥1.15fcu,k
fcu,minâ¥0.95fcu,k
ï¼äºï¼ç»è®¡æ¹æ³ââç¨äºè¯åç»æ°nâ¥10ç»æ¶
mfcuï¼Î»1 Sfcu â¥0.90fcu,k
fcu,minâ¥Î»2 fcu,k
å
¬å¼ä¸çåæ°å«ä¹ä¸ºï¼
mfcu为nç»è¯åçå¹³å强度å¼
fcu,k 为设计强度æ åå¼
fcu,min为nç»è¯åçæå°å¼ºåº¦å¼
Sfcu为nç»è¯åç强度å¼
æ åå·® å
¶ä¸Sfcu =[ (âf 2cui ï¼ n ?m 2fcu )÷( n ï¼ 1 ) ]1/2
åæ ¼
å¤å®ç³»æ°ï¼Î»1ãλ2ï¼çåå¼ä¸ºï¼
ç»æ°n 10~14 15~24 â¥25
λ1 1.7 1.65 1.6
λ2 0.9 0.85
fa=fak+ηbγ(b-3)+ηdγm(d-0.5)
å¼ä¸
fa--ä¿®æ£åç
å°åºæ¿è½½åç¹å¾å¼ï¼
fak--å°åºæ¿è½½åç¹å¾å¼
ηbãηd--åºç¡å®½åº¦ååæ·±çå°åºæ¿è½½åä¿®æ£ç³»æ°
γ--åºç¡åºé¢ä»¥ä¸åçé度ï¼å°ä¸æ°´ä½ä»¥ä¸åæµ®é度ï¼
b--åºç¡åºé¢å®½åº¦(m)ï¼å½åºå®½å°äº3mæ3måå¼ï¼å¤§äº6mæ6måå¼ï¼
γm--åºç¡åºé¢ä»¥ä¸åç
å æå¹³åé度ï¼å°ä¸æ°´ä½ä»¥ä¸åæµ®é度ï¼
d--
åºç¡å置深度(m)
æ ¹æ®æéç¨çæææ¥å¾ï¼13.8cdfMPa=ï¼1.39tdfMPa=ï¼280sdfMPa=ï¼0.56bξ=ï¼0γ1=ãæ¢çææé«åº¦050040460hmm=−=ï¼æå¸ç½®ä¸æé¢çä¼°ç®ï¼ã é¦å
ç±å
¬å¼ï¼3â4â2ï¼æ±è§£åååºé«åº¦xå³å¾ï¼ 00γ2dcdxMfbxh=−() 61101013.83004602xxÃ=Ã−() å±å¼ä¸º292053140.10xx−+= 解å¾061.950.56460257.6bxmmhmm=ξ=Ã=<ãå°æå¾xå¼ä»£å
¥å
¬å¼ï¼3â4â1ï¼ï¼æ±å¾æéé¢çæªé¢é¢ç§¯ä¸ºï¼ 261.9513.8300916.0280cdssdfbxAmmf==ÃÃ= éå5 16ï¼å¤å¾18.4mmï¼æä¾çé¢çæªé¢é¢ç§¯21005sAmm=ï¼é¢çæä¸æå¸ç½®ï¼æéæªé¢æå°å®½åº¦min230518.4430272300bmmbmm=Ã+Ã+Ã==<ï¼æ¢çå®é
ææé«åº¦05003018.4/2460.8hmm=−+=()ï¼ å®é
é
çç0Ï/1005/300460.80.07270sAbh==Ã= minÏ0.45/0.451.39/2800.0022330/002tdsdff==Ã=â>
ç±å
¬å¼ï¼3â4â1ï¼å¯ä»¥å¤æ40å¨éçæ··ååç½è½¦ï¼10è½®ï¼æ¯ä¸è½éè¿çã