| 摘要: |
| 为实现装配式停车楼结构的楼盖及坡道结构合理设计,构建了未铺装和预铺装的标志跨度分别为18 m和24 m两类预制预应力混凝土双T板,通过足尺试验获得了三分点加载下两类足尺试件弯曲性能以及剪跨比为3时两类足尺试件斜截面受力性能,初步验证了两类双T板可满足停车楼楼盖及坡道正常使用和承载能力的需求.考虑到有限数量试件的试验难以确定不同工况下双T板的基本静力性能,基于分离式建模方法,实现了荷载－变形曲线与实测结果较吻合的试验加载条件下足尺试件非线性分析.完成了均布荷载下两类双T板的弯曲性能,剪跨比范围为1~9的斜截面受力性能,以及双T板板面上停/行车的局部受力性能的模拟分析.结合足尺构件静力性能试验,验证了所构建的两类预制预应力混凝土双T板均具有良好的裂缝和变形控制性能、斜截面和正截面承载力以及局部荷载下板面承载能力,将其拼装并有效连接可形成具有良好受力性能的装配式停车楼结构坡道和楼/屋盖. |
| 关键词: 装配式停车楼 预应力混凝土 双T板 非线性分析 弯曲 剪切 |
| DOI：10.11918/j.issn.0367-6234.201801156 |
| 分类号:TU375.2 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51778186)；中国航天建设集团有限公司装配式停车楼科研项目(MH20160318) |
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| Nonlinear static analysis of prestressed concrete double-tees of precast parking structures |
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ZHANG Wenlong1,ZHOU Wei1,2,3
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(1.School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China; 2.Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology), Ministry of Education, Harbin 150090, China; 3.Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150090,China)
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| Abstract: |
| To achieve rational design of diaphragms and ramps in precast parking structures, the precast concrete topped and un-topped double-tees with the span of 18 m and 24 m were designed and constructed. A series of full-scale experiments, both of flexural behavior under two point loads and shear capacity with shear-span ratio of 3.0, were carried out. The experimental results verified general feasibility of these double-tees to meet the service requirements of multi-storey parking structures. Because it is hard to obtain static performance of double-tees under various loading patterns from limited magnitude of experimental specimens, nonlinear analysis of double-tees members on basis of discrete models was carried out. The analytical results showed that the analyzing load-deformation curves under simulation of experimental loading condition coincided with the experimental curves. Both the flexural behavior of double-tees under uniform loads and shear performance of the double-tees with shear-span ratios ranging from 1.0 to 9.0 were simulated and analyzed. Moreover, a nonlinear finite element model (FEM) of driving or stopping on the local flange region of double-tees was conducted. Combination of these simulation analysis with static loading experiment reflected advantageous performance of the precast prestressed concrete double-tees, including responses of the crack and deflection control, shear and flexural capacities and local bearing capacity. Assembled effectively, these double tees can be applied to the diaphragm and ramps and provide good performance for precast parking structures. |
| Key words: precast parking structure prestressed concrete double-tee nonlinear analysis bending shear |
