长沙理工大学学报（自然科学版）
長沙理工大學學報（自然科學版）
장사리공대학학보（자연과학판）
Journal of Changsha University of Science and Technology(Natural Science)
2014年
1期
30-36
,共7页
杨美良%何恒波%谭海亮%王皓
楊美良%何恆波%譚海亮%王皓
양미량%하항파%담해량%왕호
桥梁工程%斜交箱梁桥%斜度%梁格法%力学性能
橋樑工程%斜交箱樑橋%斜度%樑格法%力學性能
교량공정%사교상량교%사도%량격법%역학성능
bridge engineering%skew box girder bridges%skew angle%grillage method%me-chanical behavior
基于斜交箱梁桥弯扭耦合的受力特点,利用梁格法求解了自重作用下0°,10°,20°,30°,45°,60°共6种情况下多梁式连续小箱梁的弯矩、扭矩、应力和位移,对比分析了斜度对斜交连续小箱梁桥力学性能的影响。研究结果表明,在常用斜度范围(θ<60°)内,主梁跨中截面的弯矩、位移随斜度的增大先减小后增大,而墩顶截面的弯矩、跨中截面的扭矩随斜度的增大先增大再减小；各截面上缘应力随斜度的增大先增大后减小,而下缘应力则随斜度的增大先减小后增大；当斜度达到临界斜度45°时,各截面的内力、位移均达到最值,此时,跨中截面扭矩值与正桥跨中截面的扭矩值相差倍数达到了100以上；斜度为0°~10°时,主梁弯矩、应力和位移变化均较小,可近似按直桥计算。在设计中,应充分考虑斜度对斜交箱梁弯扭耦合性能的影响,合理布置墩顶截面和跨中截面的抗弯、抗扭预应力钢束,使设计更经济、安全。
基于斜交箱樑橋彎扭耦閤的受力特點,利用樑格法求解瞭自重作用下0°,10°,20°,30°,45°,60°共6種情況下多樑式連續小箱樑的彎矩、扭矩、應力和位移,對比分析瞭斜度對斜交連續小箱樑橋力學性能的影響。研究結果錶明,在常用斜度範圍(θ<60°)內,主樑跨中截麵的彎矩、位移隨斜度的增大先減小後增大,而墩頂截麵的彎矩、跨中截麵的扭矩隨斜度的增大先增大再減小；各截麵上緣應力隨斜度的增大先增大後減小,而下緣應力則隨斜度的增大先減小後增大；噹斜度達到臨界斜度45°時,各截麵的內力、位移均達到最值,此時,跨中截麵扭矩值與正橋跨中截麵的扭矩值相差倍數達到瞭100以上；斜度為0°~10°時,主樑彎矩、應力和位移變化均較小,可近似按直橋計算。在設計中,應充分攷慮斜度對斜交箱樑彎扭耦閤性能的影響,閤理佈置墩頂截麵和跨中截麵的抗彎、抗扭預應力鋼束,使設計更經濟、安全。
기우사교상량교만뉴우합적수력특점,이용량격법구해료자중작용하0°,10°,20°,30°,45°,60°공6충정황하다량식련속소상량적만구、뉴구、응력화위이,대비분석료사도대사교련속소상량교역학성능적영향。연구결과표명,재상용사도범위(θ<60°)내,주량과중절면적만구、위이수사도적증대선감소후증대,이돈정절면적만구、과중절면적뉴구수사도적증대선증대재감소；각절면상연응력수사도적증대선증대후감소,이하연응력칙수사도적증대선감소후증대；당사도체도림계사도45°시,각절면적내력、위이균체도최치,차시,과중절면뉴구치여정교과중절면적뉴구치상차배수체도료100이상；사도위0°~10°시,주량만구、응력화위이변화균교소,가근사안직교계산。재설계중,응충분고필사도대사교상량만뉴우합성능적영향,합리포치돈정절면화과중절면적항만、항뉴예응력강속,사설계경경제、안전。
Based on the mechanical characteristics of bending and torsion coupling,the ben-ding moment,torque,stress and displacement with different skew angles under its own weight were calculated with grillage method and were contrasted with those of right bridge to analyse the mechanical behavior of skew contionuous small box multi-girder bridges af-fected by skew angle.The results show that within the normal range of skew angles,as the skew angle increases,the bending moment and the displacement of the midspan section first decrease and then increase,the bending moment of the pier top section and the torsion of the midspan section first increase and then decrease,the stress at the top first increases and then decreases,the stress at the bottom first decreases and then increases.When the skew angle arrives the critical skew angle 45°,the inner force and displacement of the cross-section are to achieve the most value.In this case,the midspan section torque value is 100 times more than that of the right bridge.When the skew angle is 0°~ 10°,the changes of ben-ding moment,stress,displacement are small,the skew bridge can be approximated by right bridge.It is suggested to reasonably arrange pre-stressing tendons of the pier top sec-tion and the midspan section while designing.
