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（西北農(nóng)林科技大學(xué)水利與建筑工程學(xué)院， 楊凌 712100）

［摘要］防止框架梁剪切破壞是框架結(jié)構(gòu)抗連續(xù)倒塌設(shè)計(jì)的基本要求。研究表明，框架梁抗剪能力不足是導(dǎo)致框架結(jié)構(gòu)“強(qiáng)柱弱梁”耗能機(jī)制難以形成的重要因素之一。這就需要在設(shè)法保證框架接近形成梁鉸型塑性機(jī)構(gòu)的同時(shí)，防止梁端塑性鉸區(qū)在其達(dá)到塑性變形狀態(tài)之前發(fā)生脆性剪切破壞，即通常所說(shuō)的RC框架梁“強(qiáng)剪弱彎”措施。建立框架結(jié)構(gòu)梁端實(shí)配鋼筋“強(qiáng)剪弱彎”可靠度極限狀態(tài)方程，利用一次二階矩實(shí)用分析法求解梁端可靠度。設(shè)定框架梁“強(qiáng)剪弱彎”目標(biāo)可靠度βt：一級(jí)抗震等級(jí)βt=3.1,二級(jí)抗震等級(jí)βt=2.6,三級(jí)抗震等級(jí)βt=2.1,四級(jí)抗震等級(jí)βt=1.6。根據(jù)6組不同抗震設(shè)防烈度鋼筋混凝土框架結(jié)構(gòu)實(shí)配鋼筋施工圖，求出梁端節(jié)點(diǎn)可靠度β，對(duì)不符合“強(qiáng)剪弱彎”可靠度要求的梁端，采取增大箍筋配筋面積和改變梁截面尺寸的方法，確?？蚣芙Y(jié)構(gòu)梁端滿足“強(qiáng)剪弱彎”可靠度水平。

［關(guān)鍵詞］強(qiáng)剪弱彎； 實(shí)配鋼筋； 極限狀態(tài)方程； 可靠度；施工圖

中圖分類號(hào)： TU375.4 文獻(xiàn)標(biāo)識(shí)碼： A文章編號(hào)：  1002-848X(2016)S1-0651-07

Reliability analysis of the "strong shear weak bending" real reinforced RC frame beam 

Zhang Wenli

(College of Water Resources and Architecture Engineering， North West A & F University， Yangling 712100， China)

    Abstract: To prevent the progressive collapse of frame beam shear failure is the basic requirements of the design for frame structures mechanism. Research shows that the beam shear capacity is one of the important factors causing the "strong column weak beam" energy dissipation mechanism is difficult to form a frame structure. This needs to ensure that close to the frame type plastic hinge beam forming mechanism at the same time, to prevent the beam end plastic hinge in to brittle shear plastic deformation occurs before the destruction of the state, namely the RC frame beam usually said "strong shear weak bending" measures. The frame beam end reinforced "strong shear weak bending" reliability limit state equation is established and the analysis method is used to solve the beam end reliability using the first-order second moment. Setting frame beam "strong shear weak bending" target reliability βt: first grade anti earthquake grade βt=3.1, two grade anti earthquake grade beta βt=2.6, three grade anti earthquake grade beta βt=2.1, four grade anti earthquake grade βt=1.6. According to 6 groups of different seismic fortification intensity of reinforced concrete frame structure with steel construction graph and calculate the beam end node reliability beta, does not conform to the "strong shear weak bending" reliable degree requirements of the beam end, take increasing stirrup area and change the dimensions of the cross-section of the beam method, ensure that the frame beam end meet "strong shear weak bending" reliability level.

Keywords: strong shear weak bending; real reinforced; limit state equation; reliability; construction plans

作者簡(jiǎn)介：張文利，副研究員，Email：cszwl_yl@163.com。