2019涓€绱�(j铆)绲�(ji茅)妲�(g貌u)宸ョ▼甯€婇嫾绛嬫贩鍑濆湡绲�(ji茅)妲�(g貌u)銆嬭瑳缇╋細绗叓绔犵涓夌瘈(ji茅)
鐎忚
鏀惰棌
绱旀壄妲�(g貌u)浠剁殑鎵洸鎴潰鎵胯級鍔�
8.3.1 闁�(k膩i)瑁傛壄鐭╃殑瑷�(j矛)绠�
1.闁�(k膩i)瑁傛壄鐭╃殑姒傚康 鍦�8-6銆佸湒8-7(鐣�)
(1) 鎵煩T浣滅敤涓嬬殑鐭╁舰鎴潰妲�(g貌u)浠�锛屽湪鑸囪桓绶氬憟450鍜�1350瑙掔殑鏂瑰悜锛岀敘(ch菐n)鐢熶富鎷夋噳(y墨ng)鍔�σtp 鍜屼富澹撴噳(y墨ng)鍔�σcp 锛屽苟鏈�
鈹�σtp鈹�=鈹�σcp鈹�=鈹�τ鈹�
(2) 鏈€澶ф壄鍓噳(y墨ng)鍔�τmax 鍙婃渶澶т富鎳�(y墨ng)鍔涘潎鐧�(f膩)鐢熷湪鎴潰闀�(zh菐ng)閭婄殑涓粸(di菐n)锛岀暥(d膩ng)鏈€澶ф壄鍓噳(y墨ng)鍔涘€兼垨鑰呰(shu艒)鏈€澶т富鎳�(y墨ng)鍔涘€煎埌閬�(d谩)娣峰嚌鍦熺殑鎶楁媺寮�(qi谩ng)搴︽檪(sh铆)锛屽苟鏈櫦(f膩)鐢熺牬澹�锛岃嵎杓夐倓鍙皯閲忓鍔�锛岀洿鍒版埅闈㈤倞绶ｇ殑鎷夋噳(y墨ng)璁婇仈(d谩)鍒版贩鍑濆湡鐨勬サ闄愭媺鎳�(y墨ng)璁婂€�锛屾埅闈笂鍚勯粸(di菐n)鐨勬噳(y墨ng)鍔涘叏閮ㄥ埌閬�(d谩)娣峰嚌鍦熺殑鎶楁媺寮�(qi谩ng)搴﹀悗锛屾埅闈㈤枊(k膩i)瑁傘€傛鏅�(sh铆)锛屾埅闈㈡壙鍙楃殑鎵煩绋�(ch膿ng)鐐洪枊(k膩i)瑁傛壄鐭㏕cr銆�
2.闁�(k膩i)瑁傛壄鐭╃殑瑷�(j矛)绠楀叕寮�
瑷�(j矛)绠楅枊(k膩i)瑁傛壄鐭㏕cr鏅�(sh铆)锛屽彲浠ュ拷鐣ラ嫾绛嬬殑浣滅敤銆傚叾瑷�(j矛)绠楀叕寮忥細
Tcr = 0.7·ft·Wt (8-3)
寮忎腑 Wt —— 鎴潰鍙楁壄濉戞€ф姷鎶楃煩銆傚皪(du矛)浜庣煩褰㈡埅闈紝
Wt = b2(3h-b)/6
鑻� T>Tcr 锛屽墖鎸夎▓(j矛)绠楅厤缃彈鎵副绛嬪拰绠嶇瓔;鍚﹀墖锛屾寜妲�(g貌u)閫犺姹傞厤缃彈鎵副绛嬪拰绠嶇瓔銆�
8.3.2 鎵洸鎴潰鍙楁壄鎵胯級鍔涚殑瑷�(j矛)绠�
1. 瑷�(j矛)绠楁ā鍨� 鍦�8-8
銆婃贩鍑濆湡绲�(ji茅)妲�(g貌u)瑷�(sh猫)瑷�(j矛)瑕�(gu墨)鑼冦€嬮噰鐢ㄨ畩瑙掑害绌洪枔妗佹灦妯″瀷?锛涱姠鐐浚銊撴牎?/p>
(1) 娣峰嚌鍦熷彧鎵垮彈澹撳姏锛屽叿鏈夎灪鏃嬪舰瑁傜斧鐨勬贩鍑濆湡澶栨绲勬垚妗佹灦鐨勬枩澹撴】锛屽叾鍌捐鐐�α;
(2) 绺辩瓔鍜岀畭绛嬪彧鎵垮彈鎷夊姏锛屽垎鍒ョ偤妗佹灦鐨勫鸡妗垮拰鑵规】;
(3) 蹇界暐鏍稿績娣峰嚌鍦熺殑鍙楁壄浣滅敤鍙婇嫾绛嬬殑閵�(xi膩o)鏍撲綔鐢ㄣ€�
2.瑷�(j矛)绠楀叕寮�
閬╃瓔鍙楁壄妲�(g貌u)浠舵壄鏇叉埅闈㈠彈鎵壙杓夊姏瑷�(j矛)绠楀叕寮�:
Tu = 2ξ1/2fyvAst1Acor/s (8-17)
寮忎腑 ξ—— 鍙楁壄绺辩瓔鑸囩畭绛嬬殑閰嶇瓔寮�(qi谩ng)搴︽瘮锛�
ξ= fyAstL·s/fyvAst1·ucor (8-18)
鐐轰簡闄愬埗妲�(g貌u)浠惰绺搴�锛屼竴鑸彇 0.36≤ξ≤2.778銆�
鍙互鐪嬪嚭锛屾(g貌u)浠舵壄鏇叉埅闈㈢殑鍙楁壄鎵胯級鍔涗富瑕佸彇姹轰簬閶肩瓔楠ㄦ灦灏哄銆佺副绛嬭垏绠嶇瓔鐢ㄩ噺鍙婂叾灞堟湇寮�(qi谩ng)搴︺€傜偤浜嗛伩鍏嶈秴閰嶇瓔妲�(g貌u)浠剁殑鑴嗘€х牬澹�锛屽繀闋堥檺鍒堕嫾绛嬬殑鏈€澶х敤閲忔垨鑰呴檺鍒舵枩澹撴】骞冲潎澹撴噳(y墨ng)鍔�σc鐨勫ぇ灏�銆�
8.3.3 鎸夈€婃贩鍑濆湡绲�(ji茅)妲�(g貌u)瑷�(sh猫)瑷�(j矛)瑕�(gu墨)鑼冦€嬬殑閰嶇瓔瑷�(j矛)绠楁柟娉�
1. hw/b≤6 鐨勭煩褰㈡埅闈㈢磾鎵(g貌u)浠跺彈鎵壙杓夊姏 鍦�8-8(a)
(1) 鍦ㄦ壄鐭㏕浣滅敤涓婽u瑷�(j矛)绠楀叕寮�
Tu = 0.35ftWt + 1.2ξ1/2fyvAst1Acor/s (8-23)
ξ= fyAstL·s/fyvAst1·ucor (8-24)
寮忎腑 ξ—— 鍙楁壄绺卞悜閶肩瓔鑸囩畭绛嬬殑閰嶇瓔寮�(qi谩ng)搴︽瘮鍊硷紝
銆婃贩鍑濆湡绲�(ji茅)妲�(g貌u)瑷�(sh猫)瑷�(j矛)瑕�(gu墨)鑼冦€嬪彇ξ鐨勯檺鍒舵浠剁偤0.6≤ξ≤1.7銆�
鐣�(d膩ng)ξ>1.7鏅�(sh铆)锛屾寜ξ=1.7瑷�(j矛)绠椼€�
AstL —— 鍙楁壄瑷�(j矛)绠椾腑鍙栧皪(du矛)绋�(ch膿ng)甯冪疆鐨勫叏閮ㄧ副鍚戦嫾绛嬫埅闈㈤潰绌�;
Ast1 —— 鍙楁壄瑷�(j矛)绠椾腑娌挎埅闈㈠懆閭婃墍閰嶇疆绠嶇瓔鐨勫柈鑲㈡埅闈㈤潰绌�;
fyv —— 绠嶇瓔鐨勬姉鎷夊挤(qi谩ng)搴﹁ō(sh猫)瑷�(j矛)鍊�锛屾寜闄勮〃2.7閲囩敤锛屼絾鍙栧€间笉鎳�(y墨ng)澶т簬360N/mm2;
Acor —— 鎴潰鏍稿績閮ㄥ垎鐨勯潰绌�锛孉cor = bcor hcor锛岃(gu墨)鑼冭(gu墨)瀹歜cor銆� hcor鍒嗗垾鐐哄緸绠嶇瓔鍏�(n猫i)琛ㄩ潰瑷�(j矛)绠楃殑鎴潰鏍稿績閮ㄥ垎鐨勭煭閭婂拰闀�(zh菐ng)閭婄殑灏哄;
ucor —— 鎴潰鏍稿績閮ㄥ垎鐨勫懆闀�(zh菐ng)锛寀cor = 2(bcor + hcor);
s —— 鍙楁壄绠嶇瓔闁撹窛銆�
Wt —— 鎴潰鍙楁壄濉戞€ф姷鎶楃煩銆傚皪(du矛)浜庣煩褰㈡埅闈�锛�
Wt = b2(3h-b)/6
寮�(8-23)涓瓑寮忓彸閭婄殑绗竴闋�(xi脿ng)鐐烘贩鍑濆湡鐨勫彈鎵綔鐢�锛岀偤闁�(k膩i)瑁傛壄鐭╃殑50%;绗簩闋�(xi脿ng)鐐洪嫾绛嬬殑鍙楁壄浣滅敤锛屽彲閲囩敤璁婅搴︾┖闁撴鏋舵ā鍨嬩簣浠ヨ(shu艒)鏄�銆傞櫎绯绘暩(sh霉)灏忎簬2澶栵紝鍏惰〃閬�(d谩)寮忓畬鍏ㄧ浉鍚�銆�
瑭茬郴鏁�(sh霉)鍙�1.2灏忎簬鐞嗚珫鍊�2鐨勪富瑕佸師鍥犳槸锛氬紡(8-23)鑰冩叜浜嗘贩鍑濆湡鐨勬姉鎵綔鐢�锛孉cor鐐烘寜绠嶇瓔鍏�(n猫i)琛ㄩ潰瑷�(j矛)绠楃殑鑰岄潪鎴潰瑙掗儴绺辩瓔涓績閫ｇ窔瑷�(j矛)绠楃殑鎴潰鏍稿績闈㈢⿳銆�
(2) 鍦ㄨ桓鍚戝鍔汵鍜屾壄鐭㏕鍏卞悓浣滅敤涓婽u瑷�(j矛)绠楀叕寮�
Tu = 0.35ftWt + 1.2ξ1/2fyvAst1Acor/s +0.07N/A·Wt (8-25)
寮忎腑 N —— 鑸囨壄鐭╄ō(sh猫)瑷�(j矛)鍊糡鐩告噳(y墨ng)鐨勮桓鍚戝鍔涜ō(sh猫)瑷�(j矛)鍊�锛岀暥(d膩ng)N>0.5fcA鏅�(sh铆)锛屽彇 N=0.5fcA;A鐐烘(g貌u)浠剁殑鎴潰闈㈢⿳銆�
2. hw/tw ≤6 鐨勭褰㈡埅闈㈢磾鎵(g貌u)浠跺彈鎵壙杓夊姏 鍦�8-8(c)鐣�
瀵�(sh铆)椹�(y脿n)鍜岀悊璜栫爺绌惰〃鏄�锛屼竴瀹氬鍘氱褰㈡埅闈㈢殑鍙楁壄鎵胯級鍔涜垏瀵�(sh铆)蹇冩埅闈㈡槸鐩稿悓鐨�锛屼絾娣峰嚌鍦熼爡(xi脿ng)鎳�(y墨ng)涔樹互鑸囨埅闈㈢浉灏�(du矛)澹佸帤鏈夐棞(gu膩n)鐨勬姌娓涚郴鏁�(sh霉)锛孴u瑷�(j矛)绠楀叕寮忥細
Tu = 0.35αhftWt + 1.2ξ1/2fyvAst1Acor/s (8-26)
寮忎腑 tw —— 绠卞舰鎴潰澹佸帤锛屽叾鍊间笉鎳�(y墨ng)灏忎簬bh/7;
bh —— 绠卞舰鎴潰鐨勫搴�;
αh—— 绠卞舰鎴潰澹佸帤褰遍熆绯绘暩(sh霉)锛�
αh = (2.5tw/bh)锛岀暥(d膩ng)αh>1鏅�(sh铆)锛屽彇αh =1
Wt —— 绠卞舰鎴潰鍙楁壄濉戞€ф姷鎶楃煩锛�
Wt = bh2(3hh- bh)/6 –(bh -2tw)2/6·(3 hw –(bh -2tw)) (8-27)
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