高层正交胶合木-混凝土核心筒体系力学性能参数分析

Parametric Analysis on Mechanical Properties of High Rise CLT-concrete Core-tube System

摘要:

基于国内外高层木结构及木混凝土混合结构的研究，结合正交胶合木（CLT）的材料性能优势，设计了一种高层正交胶合木混凝土核心筒混合结构体系.运用有限元分析方法，研究不同参数对该混合结构的力学性能、变形、动力特性等的影响.结果表明,CLT板连接刚度的变化对CLT结构竖向位移的影响较大，提高CLT板间的连接刚度，可减小CLT结构竖向位移和楼层水平位移；混凝土核心筒墙体厚度增加，结构楼层水平位移平均减小9.07%，但对CLT结构竖向位移几乎无影响；一定范围内楼层数的变化对结构周期和楼层水平位移的影响较大，而对CLT剪力墙结构竖向位移的影响相对较小.

关键词:混合结构; 高层建筑; 正交胶合木(CLT); 正交胶合木混凝土核心筒结构; 参数分析

Abstract:

Based on the state-of-the-art of high-rise wood structures and wood-concrete hybrid structures, combined with the performance superiority of cross-laminated timber (CLT), a hybrid structural system made of CLT shear wall and concrete core-tube was proposed. By using the finite element method, the effect of different parameters on the mechanical properties of the hybrid structure was studied. The results indicate that the variation of connection stiffness of CLT plates has great influence on the vertical displacement of CLT system. The increase of connection stiffness of CLT shear walls can significantly reduce the vertical displacement of CLT shear wall and the lateral displacements of global system. With the increase of concrete core wall thickness, the horizontal drift of global system decreases by 9.07% on average, but it has little effect on the vertical displacement of CLT system. The change in the number of floors, to some extent, has great influence on the global structural periods and the lateral drifts, but it has little effect on the vertical displacement of CLT system.

Key words:hybrid structure; high rise building; cross-laminated timber(CLT); CLT-concrete core-tube structure; parametric analysis