叠合厚空心板装配式混凝土框架结构抗震性能及设计方法研究

The monolithic precast concrete frame structure with thick laminated concrete hollow floor slabs is made up of flat beam, thick laminated hollow slab and precast column, without clear beam, which can span large span. And the construction efficiency is greatly improved because of the large size and small number of prefabricated components. Although there is no clear beam for the monolithic precast concrete frame structure with thick laminated concrete hollow floor slabs, if the design of flat beam is reasonable, its failure mode and seismic performance under the action of earthquakes will be very different from those of the ordinary slab-pillar structure, which is more similar to the frame structure. The current research on this issue is not deep enough..Therefore, the project intends to carry out the following research. (1) To study the bending performance of one-way laminated hollow floor slabs and jointed slabs, and to reveal the failure modes of one-way and multilateral-supported laminated hollow slabs, Thus, reasonable design methods and construction measures for laminated hollow slabs and jointed slabs are proposed; (2) To put forward the equivalent beam analysis model and the bearing capacity calculation method considering the hollow slab's participation in the loading. To reveal the cooperative mechanism of flat beam and surrounding hollow slabs, and the design method and construction measures of flat beam are proposed; (3) To reveal the damage and catastrophe mechanism of the monolithic precast concrete frame structure with thick laminated concrete hollow floor slabs under earthquake action. The aseismic design method and construction measures to meet the performance requirements are put forward, which guides the structural damage reasonable and controllable. and the performance is close to the ordinary frame structure.

叠合厚空心板装配式混凝土框架结构是由宽扁梁、叠合厚空心板和预制柱组成，无明梁，可跨越较大的跨度，预制构件尺寸大、数量少，极大的提高了施工效率。叠合厚空心板装配式混凝土框架结构虽未设置明梁，若宽扁梁设计合理，其在地震作用下破坏模式和抗震性能与普通板-柱结构将有较大区别，更类似与框架结构，而目前针对这一问题的研究还不够深入。.为此，本项目拟展开以下研究：（1）研究单向叠合空心板和拼缝板抗弯性能，揭示单向和多边支撑叠合空心板破坏模式，从而提出叠合厚空心板和拼缝合理的设计方法和构造措施；（2）提出考虑空心板参与受力的等代梁分析模型和承载力计算方法，揭示宽扁梁及周边空心板带协同工作机理，提出宽扁梁设计方法和构造措施；（3）揭示地震作用下叠合厚空心板装配式混凝土框架结构的损伤及灾变机理，提出满足性能需要的抗震设计方法和构造措施，引导结构损伤合理和可控，性能接近普通框架结构。

叠合厚空心板装配式混凝土框架结构是由宽扁梁、叠合厚空心板和预制柱组成，可跨越较大的跨度，且预制构件尺寸大、数量少，提高了施工效率，项目对其抗震性能和设计方法展开了研究。（1）设计制作了4个含拼缝厚空心板进行静力试验，并采用数值模拟进行了变参数分析，研究了其受弯性能，揭示了单向和多边支撑空心板破坏模式，结果表明现浇带拼缝连接的厚空心板与现浇板受力性能类似，但拼缝宜居中设置，并避免非等跨拼接，长宽比不宜大于2；当厚空心板三边或四边搁置在承重墙体上，且仅在一个方向设置受力肋时，宜在端部实心区域和第二根受力肋之间设置构造肋，提出可采用拟梁法计算含板侧拼缝的厚空心板的刚度和承载力。（2）设计制作了7个带空心板的宽扁梁进行静力试验，并采用数值模拟进行了变参数分析，结果表明周边板带和加载方式对宽扁梁有效翼缘宽度影响较大，提出了带翼缘板宽扁梁有效翼缘宽度计算公式，并与试验结果进行对比分析，采用提出的有效翼缘宽度计算公式计算的带翼缘板宽扁梁试件的抗弯承载力理论计算值与试验值误差在10%内。（3）设计制作了14个宽扁梁-柱节点进行拟静力试验，并采用数值模拟进行了变参数分析，研究了地震作用下宽扁梁-柱节点损伤模式，结果表明宽扁梁-柱节点具有良好的耗能能力，增大轴压比、混凝土强度和梁柱截面宽度比均可提高宽扁梁-柱节点的耗能能力，我国规范与美国规范对节点核心区抗剪承载力极限值的规定较为保守。（4）设计一典型叠合厚空心板装配式混凝土框架，采用OpenSees建立了该结构的有限元模型，对其进行了时程分析，结果表明，最大层间位移角在多遇地震、设防地震以及罕遇地震作用下，结构平均最大层间位移角分别为1/667、1/169以及1/62.5，可满足框架结构地震作用下的性能需求。通过4年研究，该项目已发表论文18篇，其中SCI论文11篇，EI论文3篇，中文核心论文3篇，授权及申请专利3项，主编规程3部，有效的推动了本项目成果在实际工程中的应用。