【作者】 刘翔；

【导师】 侯和涛； 曲冰；

【作者基本信息】 山东大学 ， 结构工程， 2017， 硕士

【摘要】 钢—预制带肋混凝土叠合板组合梁是一种新型的装配式钢—混凝土组合梁。它是将预制带肋混凝土底板搁置在钢梁的翼缘上,并在底板上浇筑混凝土形成叠合楼板;通过焊接在钢梁上翼缘的抗剪连接件传递钢梁和叠合楼板间的纵向剪力,从而使二者协同工作。本文总结了传统的钢—混凝土组合梁和现有的装配式钢—混凝土组合梁的形式和应用现状,分析了它们的优势和不足。在此基础上归纳了新型的钢—预制带肋混凝土叠合板组合梁所具有的技术和经济优势,并详细介绍了它的基本原理、构造和施工方法等。为探究钢—预制带肋混凝土叠合板组合梁的抗弯设计方法,本文对国内外学者关于钢—混凝土组合梁的试验和理论研究进行文献综述,并建立了承受两点集中荷载的简支叠合板组合梁的力学模型。该模型考虑了预制底板拼缝、预制率和交界面上相对滑移的影响,由钢梁和叠合楼板微元体的受力平衡条件和变形协调条件建立方程,推导出叠合板组合梁抗弯刚度的计算方法。本文还进一步推导了新型叠合板组合梁在弹性阶段的变形曲线、交界面上相对滑移、弹性抗弯承载力的计算方法。此外,本文还基于组合梁达到极限状态时截面的塑形应力分布,建立了新型叠合板组合梁的简化极限抗弯承载力的计算方法。为验证计算方法的准确性,本文对9个钢—预制带肋混凝土叠合板组合梁试件和1个钢—全现浇混凝土组合梁试件进行四点弯曲试验。记录并分析了各组合梁试件的破坏模态和跨中弯矩—挠度曲线。主要的试验参数有叠合楼板的厚度、预制底板的搁置长度、栓钉的间距、楼板的纵向配筋率和楼板形式。本文分析了这些试验参数对叠合板组合梁抗弯性能的影响。根据四点弯曲试验的结果,本文对提出的钢—预制带肋混凝土叠合板组合梁的抗弯刚度、弹性变形、弹性抗弯承载力和极限抗弯承载力等公式验证,这些公式的计算结果与实测结果吻合良好,满足工程设计的精度要求。此外,本文还探究不同荷载下,钢梁和混凝土楼板交界面上的滑移分布规律;并以预制率作为分析参数,探究不同预制率对钢—预制带肋混凝土叠合板组合梁抗弯性能的影响。更多还原

【Abstract】 A new type of steel-concrete composite beam was developed recently for modular construction,which adopts Precast Prestressed Concrete Decks(PPCDs)as an alternative to steel corrugated decks.In a typical composite beam with PPCDs,the PPCD segments are placed on the steel beam and work as the permanent formwork.Through application of appropriate connectors between steel beam and concrete slab,their relative slip can be restrained,enabling shear force transfer between them and achievement of the composite beam action.This research introduced the recent development of conventional composite beams in modular construction and then summarized the advantages of the composite beam with PPCDs.In addition,construction and practice of such composite beam were listed in detail.in this paper.To evaluate the flexural behaviors of the composite beam with PPCDs,this research developed an analytical model for such composite beam which was subjected to two downward point loads.Considering effects of PPCD joints,the precast ratio and the interface slip,the generalized effective rigidity was derived from the internal force equilibrium and curvature compatibility of the steel beam and composite slab segments.Research also developed the calculation methods for interface slip,elastic curve along beam longitudinal direction and flexural resistance at elastic limit.Besides,a simplified analytical model based upon an assumed stress diagram was found to provide reasonable predictions for ultimate flexural resistance of such composite beams.Additionally,four-point bending tests including ten full-scale specimens were carried out to evaluate the adequacy of derived models.Specimens CB1-CB9 were composite beams consisting of PPCDs while Specimen CB10 was a composite beam with a full-depth cast-in-place included here for comparison purpose.Based upon the test results,this paper also evaluated the influence of some key design parameters(e.g.,concrete slab thickness,amount of shear studs and longitudinal reinforcement ratio)on flexural performance of the composite beams.In comparison with the experimental data from ten specimens,the developed calculation models met prediction accuracy and could help promote the applications of such composite beams in future building constructions.Furthermore,this paper explored the slip distribution on the interface between steel beam and concrete slab.The precast ratio was regarded as a key parameter and the paper investigated the influence of precast ratio on the flexural behaviors of composite beam with PPCDs when it varied.更多还原