不同种类填充墙周期折减系数取值的分析

摘要

The filled wall increases the structural rigidity accordingly increasing the structure capacity under earthquake action.At present,when calculating the natural vibration period of structure,many scholars choose to leave out the consideration of the filled wall stiffness.Usually,they just estimate its influence by multiplying the dynamic calculation of the natural vibration period and period shortening factor.The existing Technical Specification for Concrete Structures of Tall Building gives out a recommended value of the period shortening factor,but doesn' t distinguish the types of filled walls.So,it is not perfect.Based on the basic principles of structural dynamics,the period shortening factor of different filled walls is calculated by the method of rigidity equivalence,a recommended value of the period time deduction factor for some most widely used building blocks is suggested,such as antoclaved aerated concrete blocks,normal concrete small hollow blocks,lightweight aggregate concrete hollow blocks,fired clay hollow blocks and cross-drilled hole concrete hollow blocks.It may provide reference for the engineering designers.%填充墙增大了结构刚度,从而加大了结构承受的地震作用.但目前计算结构自振周期时没有考虑填充墙刚度对周期的影响,而是采用了将动力计算的自振周期乘以周期折减系数的方法来估算填充墙刚度的影响.现行《高层建筑混凝土结构技术规程》给出了周期折减系数的建议值,但没有区分不同填充墙的种类.本文基于结构动力学基本原理,采用刚度等效的方法推算出不同种类填充墙的周期折减系数,给出了目前广泛应用的加气混凝土砌块、普通混凝土空心砌块、轻骨料混凝土空心砌块、粘土空心砌块和横孔连锁混凝土空心砌块的周期折减系数建议值,可供工程设计人员参考.