摘要
连续梁存在异号弯矩,当负弯矩大于正弯矩时,裂缝发生在负弯矩区内,反之,向正弯矩区移动。除弯矩调幅产生的内力重分布外,也伴随着剪力重分布,使支座截面剪力增大,抗剪切能力不足。针对一起发生裂缝连续梁案例,抓住裂缝特征,探讨引起裂缝产生的原因;从连梁的抗剪性能着手,联系实际情况,分析模板支撑基础承载力不足对连续梁裂缝的影响,提出了加固措施。
Because of the opposite sign moment in the continuous beam, the crack will happen in the negative moment area when the negative moment is bigger than positive moment while the crack will move to the positive moment area when the positive moment is bigger. The redistribution of the internal force produced by the moment modulation as well as the redistribution of shear force leads to the increased shear force and inadequate shear resistance on the interface of the support. In the case studying of a cracked continuous beam, this paper discusses about the causes of the cracks based on the crack features. Starting with the shear property of a continuous beam and considering the actual situation, it analyzes the effect of inadequate load-bearing capacity to a continuous beam and puts forward some relative measures for consolidation of cracks.
出处
《洛阳理工学院学报（自然科学版）》
2011年第1期19-22,27,共5页
Journal of Luoyang Institute of Science and Technology：Natural Science Edition
关键词
连续梁
剪切裂缝
模板支撑下沉
continuous beam
shear crack
formwork support sinking
