ËùÐèÒªµÄ¸ÖË¿ÀÉþ(бÀ¸Ë)µÄÀ»·×îСֱ¾¶ D=(17924¡Á4/3.142¡Á125) 1/2 =14mm£»
Ñ¡ÓæÕ16Ô²¸Öµõ»·£¬µõ»·²ÉÓà HPB235 ¼¶¸Ö½îÖÆ×÷£¬ÑϽûʹÓÃÀä¼Ó¹¤¸Ö½î¡£µõ»·ÃªÈë»ìÄýÍÁµÄÉî¶È²»Ó¦Ð¡ÓÚ 30d£¬²¢Ó¦º¸½Ó»ò°óÔúÔÚ¸Ö½î¹Ç¼ÜÉÏ¡£
Ê®¶þ¡¢Ãª¹Ì¶ÎÓëÂ¥°åÁ¬½ÓµÄ¼ÆËã:
1.ˮƽ¸ÖÁºÓëÂ¥°åѹµãÈç¹û²ÉÓøֽîÀ»·£¬À»·Ç¿¶È¼ÆËãÈçÏ£º
ˮƽ¸ÖÁºÓëÂ¥°åѹµãµÄÀ»·ÊÜÁ¦ R=0.003 kN£»
ˮƽ¸ÖÁºÓëÂ¥°åѹµãµÄÀ»·Ç¿¶È¼ÆË㹫ʽΪ:
= 50N/mm2£»
ÆäÖÐ [f] ΪÀ»·¸Ö½î¿¹ÀÇ¿¶È£¬°´ÕÕ¡¶»ìÄýÍÁ½á¹¹Éè¼Æ¹æ·¶¡·10.9.8Ìõ[f]
ËùÐèÒªµÄˮƽ¸ÖÁºÓëÂ¥°åѹµãµÄÀ»·×îСֱ¾¶ D=[3.314¡Á4/(3.142¡Á50¡Á2)] =0.205 mm£»
ˮƽ¸ÖÁºÓëÂ¥°åѹµãµÄÀ»·Ò»¶¨ÒªÑ¹ÔÚÂ¥°åϲã¸Ö½îÏÂÃ棬²¢Òª±£Ö¤Á½²à30cmÒÔÉÏ´î½Ó³¤¶È¡£
Ñ¡ÓæÕ16Ô²¸Öê»·¡£Ë®Æ½¸ÖÁºÓëÂ¥°åѹµãµÄÀ»·Ò»¶¨ÒªÑ¹ÔÚÂ¥°åϲã¸Ö½îÏÂÃ棬²¢Òª±£Ö¤Á½²à30cmÒÔÉÏ´î½Ó³¤¶È¡£
1/2
12.3ÐüÌô½ÅÊÖ¼ÜÑô½ÇÐ͸ּÆËãÊé
Ò»¡¢²ÎÊýÐÅÏ¢ :
1¡¢ºÉÔزÎÊý
½ÅÊÖ¼ÜÌôÁº´«µÝÖ§×ùÁ¦F(kN)£º13.907;
2¡¢Ñô½ÇÐ͸ֹ¹Ôì²ÎÊý
Ð͸ÖÖ§³ÅÐÎʽ£ºÁ½¸ù¸ÖË¿ÀÉþ; Á¢¸ËºáÏò¼ä¾à»òÅžàLa(m)£º900; ÄÚÅżܾàÀëǽ³¤¶Èa(m)£º0.30; Ñô½ÇÐ͸ֳ¤¶ÈL(m)£º4.50; µãMµ½QµãµÄ¾àÀëD1(m): 2.90;
45
Ö§µãPµ½½¨ÖþÎï½ÇµãOµÄ¾àÀëD3(m)£º2.12; Oµãµ½QµãµÄ¾àÀëD2(m)£º0.30;
3¡¢Ñô½ÇÐ͸ֲÄÁϲÎÊý:
Ð͸ÖÐͺţº16ºÅ¹¤×Ö¸Ö; ¸ÖË¿Éþ¹æ¸ñÐͺţº6¡Á19;
¶þ¡¢Ñô½ÇÐ͸ּÆËã
ˮƽÑô½ÇÐ͸ֲÉÓú¸½Ó½¨ÖþÎïÂñ¼þÁ¬½Ó£¬¼ÆËãÌõ¼þΪһ¶Ë¹ÌÖ§µÄÁ¬ÐøÁº¡£ Ð͸ֽØÃæ¹ßÐÔ¾ØI = 1130.00cm£¬½ØÃæµÖ¿¹¾ØW =141.00cm£¬½ØÃæ»ýA =26.10cm2¡£
4
3
Ñô½ÇÐ͸ÖʾÒâͼ
Ñô½ÇÐ͸ּÆËã¼òͼ
1¡¢Ð͸ÖÊÜÁ¦¼ÆËã
½ÅÊÖ¼ÜÁªÁº´«µÝÖ§×ùÁ¦F=13.907kN;
ˮƽ¸ÖÁº×ÔÖغÉÔØ q=1.2¡Á20.50¡Á9.8¡Á10-3=0.241kN/m ¾¹ýÁ¬ÐøÁºµÄ¼ÆËãµÃµ½
46
Ñô½ÇÐ͸ÖÖ§³ÅÁº¼ôÁ¦Í¼£¨kN£©)
Ñô½ÇÐ͸ÖÖ§³ÅÁºÍä¾Øͼ£¨kN.m£©)
Ñô½ÇÐ͸ÖÖ§³ÅÁº±äÐÎͼ(mm)
Ð͸ÖÖ§µãµÄµÄÖ§³ÅÁ¦ÎªRA=13.868kN; Ð͸ֹ̽Ӵ¦µÄÖ§³ÅÁ¦ÎªRB=15.031kN; Ð͸Ö×î´óÍä¾Ø Mmax=5.493kN.m;
ͼÖоàÀë|MP|= (2.900¡Á2.900+0.300¡Á0.300+2.120¡Á2.120+1.414¡Á0.300¡Á2.120)=3.727m
ͼÖÐ½Ç¶È Ë®Æ½Ð͸ֵÄÖáÏòÁ¦ N=2¡Á8.912¡Ácos(51.0790)¡Ácos(8.0540)=11.08kN Ð͸Ö×î´óÓ¦Á¦¼ÆËãÖµ ¦Ò= 1/2 47 M/1.05W+N/A=5.493¡Á106/(1.05¡Á141¡Á103)+11.08¡Á103/(26.1¡Á102)=41.345N/mm2 Ð͸ֵÄ×î´óÓ¦Á¦¼ÆËãÖµ ¦Ò= 41.345N/mm2 СÓÚÐ͸ֵĿ¹ÍäÇ¿¶ÈÉè¼ÆÖµ 215.000 N/mm2£¬Âú×ãÒªÇó£¡ 2¡¢Ð͸ÖÕûÌåÎȶ¨ÐÔ¼ÆËã ˮƽÐ͸ֲÉÓÃ16ºÅ¹¤×Ö¸Ö,¼ÆË㹫ʽÈçÏÂ: (GB50017-2003)¸½Â¼BµÃµ½£º¦Õb=1.916 ÆäÖЦÕb -- ¾ùÔÈÍäÇúµÄÊÜÍä¹¹¼þÕûÌåÎȶ¨ÏµÊý£¬²é±í¡¶¸Ö½á¹¹Éè¼Æ¹æ·¶¡· ÓÉÓÚ¦Õb´óÓÚ0.6£¬²é¡¶¸Ö½á¹¹Éè¼Æ¹æ·¶¡·(GB50017-2003)£¬µÃµ½ ¦Õb'=1.07-0.282/¦Õb = 1.07-0.282/1.916=0.923¡£ ¾¹ý¼ÆËãµÃµ½×î´óÓ¦Á¦ ¦Ò = 5.493¡Á106 /( 0.923¡Á141¡Á103)= 42.213 N/mm2 Ð͸ֵÄ×î´óÓ¦Á¦¼ÆËãÖµ ¦Ò = 42.213N/mm2 СÓÚ [f] = 215 N/mm2 ,Âú×ãÒªÇó! 3¡¢ÀÉþÇ¿¶È¼ÆËã ¸ÖË¿ÀÉþ(бÀ¸Ë)µÄÖáÁ¦Îª8.912kN£» Èç¹ûÉÏÃæ²ÉÓøÖË¿Éþ£¬¸ÖË¿ÉþµÄÈÝÐíÀÁ¦¼ÆË㹫ʽ£º ÆäÖÐ[Fg]-- ¸ÖË¿ÉþµÄÈÝÐíÀÁ¦(kN)£» Fg -- ¸ÖË¿ÉþµÄ¸ÖË¿ÆƶÏÀÁ¦×ܺÍ(kN)£» ¼ÆËãÖнüËÆÈ¡Fg=0.5d2£¬dΪ¸ÖË¿ÉþÖ±¾¶(mm)£» ¦Á -- ¸ÖË¿ÉþÖ®¼äµÄºÉÔز»¾ùÔÈϵÊý£¬¶Ô6¡Á19¡¢6¡Á37¡¢6¡Á61¸ÖË¿Éþ·Ö±ðÈ¡0.85¡¢0.82ºÍ0.8£» K -- ¸ÖË¿ÉþʹÓð²È«ÏµÊý£¬È¡8.0¡£ ¼ÆËãÖÐ[Fg]È¡8.912kN£¬¦Á=0.85,K=8£¬µÃµ½£ºd=13.0mm¡£ Ñ¡Ôñ6¡Á19¸ÖË¿Éþ,×îСֱ¾¶±ØÐë´óÓÚ13mm²ÅÄÜÂú×ãÒªÇó£¡ 48