连续组合梁桥裂缝发展规律分析及裂缝宽度计算  

LAW OF CRACK DEVELOPMENT AND CALCULATION OF CRACK WIDTH OF CONTINUOUS COMPOSITE BEAMS

作　　者：张彦玲[1] 樊健生[2] 李运生[1] 

机构地区：[1]石家庄铁道学院土木分院,石家庄050043 [2]清华大学土木工程系,北京100084

出　　处：《工程力学》2011年第7期84-90,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(50408001);河北省自然科学基金项目(E2009000893);河北省教育厅资助科研项目(2010277)

摘　　要：为研究组合梁在负弯矩作用下的混凝土开裂机理及裂缝发展规律,以提出更好地适用于钢-混凝土组合梁桥的裂缝宽度计算公式,对3根反向加载的钢-混凝土简支组合梁和3根2跨连续组合梁进行了静载试验。试验表明,混凝土板中横向钢筋间距对组合梁的裂缝间距具有较大影响。根据试验结果并结合其它的研究成果,将横向钢筋间距和配筋力比作为主要影响参数,给出了混凝土桥面板的裂缝间距计算公式,并对现行规范中的钢筋应变不均匀系数进行了修正。计算所得的裂缝宽度与试验值吻合良好,可为组合梁桥裂缝宽度验算提供参考。Static model tests are conducted on three simply supported steel-concrete composite beams under negative moment and on three continuous two-span composite beams.The study focuses on the cracking mechanism and law of crack development,and test results show that transverse reinforcements space generate certain influence on cracking space.According to the test results as well as test data by others,the calculated formula is suggested with the consideration of the transverse reinforcements space and force ratio as two main parameters.At the same time,the formula of uneven coefficient of reinforcement strain in current code is modified,and the calculation formula of crack width for composite beam is suggested.The calculated crack widths are in good agreement with the test results.The results in this paper can provide reference for calculating crack width of composite beams.

关 键 词：组合梁 裂缝宽度 模型试验 裂缝间距 横向钢筋间距 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]