箱形截面连续组合梁桥的荷载横向分布  

Transverse load distribution on box section continuous composite steel-concrete bridges

作　　者：聂鑫[1] 樊健生[1] 付裕[2] 

机构地区：[1]清华大学土木工程系,结构工程与振动教育部重点实验室,北京100084 [2]北京市公联公路联络线有限责任公司,北京100071

出　　处：《清华大学学报（自然科学版）》2009年第12期1930-1933,1938,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50408001)

摘　　要：研究了变截面箱形钢-混凝土连续组合梁桥的荷载横向分布。比较了杠杆原理、修正偏心压力法2种算法。采用修正的偏心压力法,把空间问题转化为平面问题,考虑箱梁组合梁抗扭刚度,计算其荷载横向分布系数。对空间有限元分析结果和实桥试验结果进行对比。结果表明:桥面板厚度是影响荷载横向分布系数的主要因素;采用修正偏心压力法较简单并偏于安全;而横向联系梁对组合梁桥荷载横向分配系数的影响不大。Continuous composite steel-concrete bridges with variable box sections are being rapidly developed in China.The lateral load distributions on such bridges were investigated using the leverage law and fixed eccentric lateral load distribution prediction methods.The scale variations on such bridges were simplified to a plane problem using the fixed eccentric pressure method with the box girder torsional stiffness to calculate lateral load distribution factors.The results from spatial FEM analyses compare well with field loading tests.The results show that the fixed eccentric pressure method is simple to use and conservative,the concrete deck thickness strongly affects the load distribution on a composite box girder bridge,and the horizontal beams do not significantly affect the lateral load distribution factors.

关 键 词：连续梁桥 箱形截面组合梁 荷载横向分布 数值计算 现场实测与验证 

分 类 号：TU398.9[建筑科学—结构工程]