[¹ãÖÝ]¸ß²ã½¨ÖþÍâ½ÅÊÖ¼ÜÊ©¹¤·½°¸£¨Â䵨¼Ü¡¢ÐüÌô¼Ü ¼ÆËãÊéÏêϸ£© - secret - ͼÎÄ ÏÂÔØ±¾ÎÄ

ÄÏɳXXµØ¿éÍâ½ÅÊÖ¼ÜרÏîÊ©¹¤·½°¸

×÷ÓÃÓÚ×ÝÏòˮƽ¸ËÏߺÉÔØ±ê×¼Öµ£º

ÓÀ¾ÃºÉÔØ q1=1.2¡Á(0.0376+0.12)=0.19kN/m Ê©¹¤»îºÉÔØ q2=1.4¡Á1.20=1.68kN/m 2£© ×ÝÏòˮƽ¸ËÊÜÁ¦¼ÆËã

ÿ¸ù¸Ö¹Ü³¤Ô¼6.00m£¬°´ËÄ¿çÁ¬ÐøÁº¼ÆËã a.¿¹ÍäÇ¿¶ÈÑéËã

Íä¾ØÏµÊýKM1=-0.107

M1=Kmq1L=-0.107¡Á0.19¡Á1.50=-0.05kN.m Íä¾ØÏµÊýKM2=-0.121

M2=Kmq2L=-0.121¡Á1.68¡Á1.50=-0.46kN.m Mmax=M1+M2=0.05+0.46=0.50kN.m ¦Ò=Mmax/W=500000/5080=98.43N/mm

×ÝÏòˮƽ¸ËµÄ¿¹ÍäÇ¿¶È¦Ò=98.43N/mm£¼f=205N/mm£¬Âú×ãÒªÇó¡£ b.ÄÓ¶ÈÑéËã

2

2

2

2

2

2

2

ÄÓ¶ÈϵÊýK¦Ô1=0.632

¦Ô1=K¦Ô1q1L/(100EI)=0.632¡Á0.19/1.2¡Á(1500)/(100EI)=0.20mm ÄÓ¶ÈϵÊýK¦Ô2=0.939

¦Ô2=K¦Ô2q2L/(100EI)=0.939¡Á1.68/1.4¡Á(1500)/(100EI)=2.27mm ¦Ô

max

4

4

4

4

=¦Ô1+¦Ô2=0.20+2.27=2.47mm

max

×ÝÏòˮƽ¸ËµÄÄӶȦÔc.×î´óÖ§×ù·´Á¦

=2.47mm£¼[¦Ô]=L/150=1500/150=10.00mmÓë10.00mm£¬Âú×ãÒªÇó¡£

Rq1=1.143¡Á0.19¡Á1.50=0.33kN Rq2=1.223¡Á1.68¡Á1.50=3.08kN Rmax=Rq1+Rq2=3.41kN £¨2£©ºáÏòˮƽ¸ËÊÜÁ¦¼ÆËã 1)ºÉÔØ¼ÆËã

¸Ö¹Ü×ÔÖØgk1=0.0376kN/m

Öмä×ÝÏòˮƽ¸Ë´«µÝÖ§×ù·´Á¦RÖÐ=Rmax=3.41kN ÅÔ±ß×ÝÏòˮƽ¸Ë´«µÝÖ§×ù·´Á¦R±ß=Rmax/2=1.71kN.

µÚ 48 Ò³ ¹² 88 Ò³ XX½¨ÉèÓÐÏÞ¹«Ë¾

ÄÏɳXXµØ¿éÍâ½ÅÊÖ¼ÜרÏîÊ©¹¤·½°¸

2)ºáÏòˮƽ¸ËÊÜÁ¦¼ÆËã a.¿¹ÍäÇ¿¶ÈÑéËã

Mmax=qL/8£«RÖÐa=(0.0376¡Á0.80¡Á0.80/8+3.41¡Á0.20)¡Á10=685200N.mm=0.69kN.m

2

6

¦Ò=Mmax=685200/5080=134.88N/mm

¿¹ÍäÇ¿¶È¦Ò=134.88N/mm

¼¯ÖкÉÔØ²úÉúµÄÄÓ¶ÈΪ£º

¦Ô1=Pl/(48EI)=3410¡Á512000000/(48EI)=1.45mm

¾ù²¼ºÉÔØ²úÉúµÄÄÓ¶ÈΪ£º¦Ô2=5qL/384EI=5¡Á0.0376¡Á800/(384EI)=0.01mm ¦Ô

max

4

4

3

2

2

2

=¦Ô1+¦Ô2=1.45+0.01=1.46mm

max

ºáÏòˮƽ¸ËµÄÄӶȦÔRmax=RÖУ«Gk1¡ÁL/2

=1.46mm£¼[¦Ô]=L/150=800/150=5.33mmÓë10.00mm£¬Âú×ãÒªÇó¡£

£¨3£©ºáÏòˮƽ¸ËÓëÁ¢¸ËµÄÁ¬½Ó¿Û¼þ¿¹»¬ÒÆÑéËã:

=3.41£«0.0376¡Á0.40=3.43kN

ºáÏòˮƽ¸ËÓëÁ¢¸ËÁ¬½Ó¿Û¼þR=3.43kN£¼Rc=8.0kN(RcΪ¿Û¼þ¿¹»¬³ÐÔØÁ¦Éè¼ÆÖµ)£¬Âú×ãÒªÇó¡£

3.Á¢¸Ë¼ÆËã

(1)Á¢¸ËÈÝÐí³¤Ï¸±ÈÑéËã ¼ÆË㳤¶È¸½¼ÓϵÊýk=1.0

¿¼ÂǽÅÊÖ¼ÜÕûÌåÎȶ¨ÒòËØµÄµ¥¸Ë¼ÆË㳤¶ÈϵÊý¦Ì=1.500£» Á¢¸Ë²½¾àh=1.80m£»Á¢¸Ë¼ÆË㳤¶È£¬ Lo=k¦Ìh=1.0¡Á1.5¡Á1.80=2.70m=2700m ³¤Ï¸±È¦Ë=Lo/i= 2700/15.80=170.89 Á¢¸Ë³¤Ï¸±È¦Ë=170.89<[210]Âú×ãÒªÇó £¨2£©Á¢¸ËÎȶ¨ÐÔÑéËã

µÚ 49 Ò³ ¹² 88 Ò³ XX½¨ÉèÓÐÏÞ¹«Ë¾