无粘结部分预应力高强混凝土梁裂缝宽度及闭合弯矩的计算  

Calculation of the crack width and closed bending moments for unbonded partially prestressed concrete (PPC) beams with high strength concrete

作　　者：宋永发[1] 宋玉普[1] 赵国藩[1] 

机构地区：[1]大连理工大学海岸及近海工程国家重点实验室

出　　处：《中国公路学报》1999年第2期31-37,共7页China Journal of Highway and Transport

基　　金：大连理工大学海岸及近海工程国家重点实验室基金

摘　　要：通过２６根无粘结部分预应力高强混凝土梁，研究了影响裂缝宽度及裂缝闭合的主要因素，将无粘结部分预应力高强混凝土梁在使用荷载作用下的受力状态转化为偏心受压构件的受力状态，求解非预应力筋的应力，然后采用现有规范裂缝宽度计算公式来求无粘结部分预应力高强混凝土梁的裂缝宽度，并建立了重复荷载作用下的无粘结部分预应力高强混凝土梁裂缝宽度计算公式；应用名义拉应力建立了闭合弯矩计算公式。Based on the experimental results of 26 unbonded partially prestressed concrete (PPC) beams with high strength concrete, the major factors which affect the crack width and closed bending moments of unbonded beams are studied. The state under service loading of unbonded PPC beams with high strength concrete is considered as that of eccentric compression member to solve the stress of nonprestressed reinforcement, and the crack width evaluation formula in the present code is used to calculate the crack width of unbonded PPC beams with high strength concrete. Thus the crack width evaluation formula of unbonded PPC beams with high strength concrete under cycle loading is formed. The formula of closed bending moments is obtained based on the nominal tension stress.

关 键 词：高强混凝土 裂缝宽度 闭合弯矩 混凝土梁 

分 类 号：TU378.201[建筑科学—结构工程]