实配钢筋“强剪弱弯”型RC框架梁可靠度分析

发布时间：2018-01-23 08:08

  本文关键词： 强剪弱弯 实配钢筋 极限状态方程 可靠度 施工图　出处：《建筑结构》2016年S1期 　论文类型：期刊论文

【摘要】：防止框架梁剪切破坏是框架结构抗连续倒塌设计的基本要求。研究表明,框架梁抗剪能力不足是导致框架结构"强柱弱梁"耗能机制难以形成的重要因素之一。这就需要在设法保证框架接近形成梁铰型塑性机构的同时,防止梁端塑性铰区在其达到塑性变形状态之前发生脆性剪切破坏,即通常所说的RC框架梁"强剪弱弯"措施。建立框架结构梁端实配钢筋"强剪弱弯"可靠度极限状态方程,利用一次二阶矩实用分析法求解梁端可靠度。设定框架梁"强剪弱弯"目标可靠度βt:一级抗震等级βt=3.1,二级抗震等级βt=2.6,三级抗震等级βt=2.1,四级抗震等级βt=1.6。根据6组不同抗震设防烈度钢筋混凝土框架结构实配钢筋施工图,求出梁端节点可靠度β,对不符合"强剪弱弯"可靠度要求的梁端,采取增大箍筋配筋面积和改变梁截面尺寸的方法,确保框架结构梁端满足"强剪弱弯"可靠度水平。
[Abstract]:Preventing shear failure of frame beam is the basic requirement of continuous collapse design of frame structure. The insufficient shear capacity of frame beam is one of the important factors that lead to the difficulty of energy dissipation mechanism of "strong column and weak beam" of frame structure, so it is necessary to make sure that the frame approach to form beam hinge plastic mechanism at the same time. The brittle shear failure is prevented in the plastic hinge region of the beam before it reaches the plastic deformation state. That is to say, the RC frame beam "strong shear weak bending" measures, the frame structure beam end with steel bar "strong shear weak bending" reliability limit state equation of state. The reliability of beam end is calculated by using the first order second order moment practical analysis method. The reliability 尾 t of the target of "strong shear and weak bending" of the frame beam is set up: the first grade of earthquake resistance is 3.1, and the second grade of earthquake resistance is 尾 _ t _ (2.6). According to six groups of reinforced concrete frame structures with different seismic fortification intensity, the reliability 尾 of beam end joints is calculated. For the end of beam which does not meet the reliability requirement of "strong shear and weak bending", the method of increasing the reinforcement area of stirrups and changing the size of beam section is adopted to ensure that the beam end of frame structure meets the reliability level of "strong shear and weak bending".
【作者单位】： 西北农林科技大学水利与建筑工程学院;
【分类号】：TU375
【正文快照】： 0引言多层和高层RC框架房屋是我国工业与民用建筑中最常用的结构形式,由于其自身刚度小,地震作用引起的侧向位移较大,采取合理的抗震构造措施是保证RC框架结构抗地震倒塌能力的关键[1]。框架结构应具有必要的承载力、刚度、稳定性、延性及合理的耗能方面的性能,主要的耗能构件，

本文编号：1457143