【作者】 吕超；

【导师】 范力；

【作者基本信息】 中国矿业大学 ， 结构工程， 2018， 硕士

【摘要】 轻质条板填充墙具有重量轻、安装方便、施工速度快等优点,符合我国对于建筑工业化和绿色建筑的发展要求。目前墙板类填充墙已广泛在预制和现浇RC框架结构中使用。但以往关于填充墙RC框架抗震性能的研究多集中于砖类和砌块类填充墙RC框架结构,对墙板类填充墙RC框架结构的研究较少,使得目前墙板类填充墙RC框架结构的抗震设计缺乏依据,只能暂且按照砌体填充墙RC框架结构的规定执行,给工程安全留下隐患。本文通过试验和理论分析相结合的方法对轻质条板填充墙RC框架结构的抗震性能展开研究。主要研究内容及结论如下:(1)进行外围框架相同的纯RC框架试件CK1、砌体填充墙RC框架试件TK1、填充三块轻质条板的RC框架试件TK2的低周反复加载试验,对比研究轻质条板填充墙和砌体填充墙对RC框架抗震性能的影响,试验表明:轻质条板填充墙较砌体填充墙对RC框架的刚度和强度的提升更加明显,试件CK1、TK1、TK2的初始刚度之比为1:1.67:1.75,极限强度之比为1:1.52:2.03;轻质条板填充墙RC框架以填充墙角部局部破坏为主要破坏特征,骨架曲线在到达峰值后会出现突降,其延性系数比砌体填充墙RC框架小。(2)进行填充三块轻质条板的弱RC框架试件TK3和填充四块轻质条板的RC框架试件TK4的低周反复加载试验,与试件TK2对比,研究框墙刚度比和填充墙宽高比对轻质条板填充墙RC框架结构抗震性能的影响,试验表明:随着框墙刚度比的增大,轻质条板填充墙RC框架的填充墙整体破坏减弱,局部破坏加强;填充墙宽高比对结构的刚度退化规律影响不大,对结构的耗能能力影响也不大,试件TK2和TK4的累积耗能值和相对能量耗散系数相当。(3)本文提出用综合影响比l来评价地震过程中填充墙对RC框架抗震性能的综合影响,综合影响比即填充墙使RC框架水平抗力提升幅度与其使RC框架承受地震作用增加幅度的比值。研究表明:加载全过程中,条板填充墙和砌体填充墙对RC框架抗震性能的综合影响比均大于1;条板填充墙与砌体填充墙相比,在小震阶段,前者对RC框架抗震性能的综合影响比更大,在大震阶段,后者对RC框架抗震性能的综合影响比更大。(4)通过对轻质条板填充墙RC框架结构的刚度退化规律进行分析,本文提出轻质条板用作填充墙使用时,RC框架结构周期折减系数的取值应较砌体填充墙折减0.95倍;此外,本文针对轻质条板填充墙RC框架结构体系的抗震薄弱环节提出了抗震构造措施。更多还原

【Abstract】 Lightweight wallboard infill wall has the advantages of light weight,easy installation,and high construction speed.Conforms to our country’s requirements for the development of building industrialization and green building.And until now,lightweight filling wallboard has been widely used in precast and cast-in-situ RC frame structures.However,previous studies on the seismic behavior of infilled frame structures mainly focus on brick and block infilled RC frame structures.And the study of lightweight wallboard-infilled RC frame structure has not been carried out so far.This resulted in the lack of basis for the current seismic design of RC frame structures with lightweight wallboard infill wall.And in practical engineering,it could only be executed according to the rules of masonry infilled RC frame structure.This left hidden dangers to engineering safety.In this paper,the seismic performance of lightweight-wallboard infilled RC frame structure was studied by means of experiment method and theoretical analysis.The main research contents and conclusions were as follows:(1)The cyclic tests on three single story single span RC frame specimens including one bare RC frame specimen CK1,one masonry-infilled RC frame specimen TK1,and one infilled RC frame specimen TK2 with three lightweight wallboard were carried out to study the difference influence on the seismic behaviors of RC frame between block infill wall and lightweight wallboard infill wall.The experimental results showed that: Comparing with masonry infill wall,lightweight wallboard infill wall has a strong lifting effect on the strength and stiffness of RC frame,the ratio of initial stiffness of specimen CK1,TK1,TK2 was 1:1.67:1.75,and the ratio of ultimate strength was 1:1.52:2.03;In addition,the failure mode of lightweight wallboard-infilled RC frames was the collapse of the corners of the wallboard which was a brittle failure,and when the skeleton curve reaches its peak,there will be a sudden drop,besides the ductility coefficient of lightweight wallboard-infilled RC frames was smaller than that of masonry-infilled RC frames.(2)The cyclic tests on infilled RC weak frame specimen TK3 with three lightweight wallboard and infilled RC frame specimen TK4 with four lightweight wallboard was carried out,then comparing wih specimen TK2 to study the effect of the stiffness ratio of frame and filling wall and the width and height ratio of filling wall on the seismic performance of lightweight wallboard-infilled RC frame structure.The experimental results showed that: With the increase of the stiffness ratio of frame and filling wall,the overall failure of lightweight wallboard infill wall of lightweight wallboard-infilled RC frame structure was weakened,and the local failure was strengthened;Besides,the width and height ratio of filling wall has little effect on the stiffness degradation law of the structure,and the effect of filling wall width and height ratio on energy dissipation was not significant,during the entire loading process the cumulative energy dissipation coefficient and relative energy dissipation coefficient of TK2 and TK4 were equivalent.(3)The comprehensive influence ratio l was put forward to evaluate the comprehensive influence of infilled walls on RC frame structure during earthquake.The ratio of comprehensive influence was the ratio of the increase of horizontal resistance of RC frame to the increase of RC frame subjected to earthquake action.Through analysis,it was considered that the filling of lightweight wallboard infill wall and masonry infill wall were beneficial to the seismic performance of RC frame,because the comprehensive impact ratio of infill walls to the RC frame’s seismic performance was bigger than 1.Compared lightweight wallboard and masonry infill walls,in the small earthquake stage,the former was more favorable to the seismic performance of RC frame structure;while in the large earthquake stage,the latter was more favorable to the seismic performance of RC frame structure.(4)Through the analysis of the stiffness degradation law of the lightweight wallboard-infilled RC frames,it was proposed that when lightweight wallboard were used as infill walls,the value of the reduction coefficient of the RC frame structure should be reduced by 0.95 times than the masonry infill wall;finally,seismic structural measures have been proposed for the weak seismic resistance of lightweight wallboard-infilled RC frame.更多还原