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为改善叠合式地下室外墙板基础顶部的受力情况,提出了嵌入式基础。设计制作了两组共4个试件,并施加模拟侧向土压力的平面外荷载进行了静力加载试验。结果表明:墙板嵌入深度对受力性能有较大影响,嵌入深度较大的第1组试件基础基本保持完好,破坏模式为墙板底部在剪力和弯矩共同作用下发生斜拉破坏;对于嵌入深度较小的第2组试件,基础底座发生了严重破坏,破坏模式为跨中塑性铰达到转动极限;预制墙板和核心区现浇混凝土未发生明显滑移,能够有效地共同工作。在试验研究基础上,采用ANSYS软件对试件受力过程进行了数值模拟分析。分析与试验结果的对比表明:所建立的有限元分析模型可以较好地模拟试件的受力过程和破坏形态,可作为下一步研究的基础。
In order to improve the stress on the top of the basement wall of the laminated basement, an embedded foundation is proposed. A total of four specimens were designed and manufactured in two groups, and static loading tests were carried out by applying an out-of-plane load simulating the lateral earth pressure. The results show that the embedding depth of wallboard has a significant influence on the mechanical properties of the specimens. The foundation of specimen 1 of the larger depth of embedment remains basically intact. The failure mode is that the bottom of the wallboard is inclined and pulled under the combined action of shear force and bending moment For the second group of specimen with less depth of embedment, the base foundation suffered serious damage and the failure mode was that the transversal plastic hinge reached the limit of rotation. The cast-in-situ concrete of the prefabricated wallboard and the core area did not slip significantly and could effectively work together jobs. Based on the experimental research, the stress simulation process of the specimen was analyzed by ANSYS software. The comparison between the analysis and experimental results shows that the finite element analysis model established can well simulate the stress process and failure mode of the specimen, which can be used as the basis for further research.