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基于改進(jìn)拉壓桿模型的PC框架節(jié)點(diǎn)抗剪強(qiáng)度預(yù)測*
王國林1,孟少平2
摘 要

 

王國林1,孟少平2
1 上海應(yīng)用技術(shù)學(xué)院城市建設(shè)與安全工程學(xué)院, 上海 201418; 2 東南大學(xué)混凝土及預(yù)應(yīng)力混凝土結(jié)構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室, 南京 210096
 
[摘要]針對(duì)預(yù)應(yīng)力混凝土(PC)框架節(jié)點(diǎn)抗剪強(qiáng)度合理計(jì)算模型的缺乏,建立了一個(gè)顯式考慮預(yù)應(yīng)力效應(yīng)的改進(jìn)拉壓桿模型。依據(jù)Kupfer-Gerstle雙向拉壓強(qiáng)度準(zhǔn)則,考慮了節(jié)點(diǎn)核心區(qū)混凝土軟化效應(yīng),并基于此準(zhǔn)則推導(dǎo)了一個(gè)簡便實(shí)用的受剪承載力預(yù)測公式。通過對(duì)文獻(xiàn)中21組內(nèi)、外節(jié)點(diǎn)進(jìn)行分析,得到試驗(yàn)值與模型預(yù)測結(jié)果的平均比值為1.14,離散系數(shù)為0.139,表明本文公式預(yù)測結(jié)果較精確、連續(xù)且偏于安全,而且還優(yōu)于《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》(GB 500102010)中的設(shè)計(jì)方法,可用于有、無粘結(jié)PC框架節(jié)點(diǎn)的抗震設(shè)計(jì)。
[關(guān)鍵詞]預(yù)應(yīng)力混凝土; 梁柱節(jié)點(diǎn); 抗剪強(qiáng)度; 預(yù)應(yīng)力效應(yīng); 拉壓桿模型; 混凝土雙向拉壓強(qiáng)度準(zhǔn)則
中圖分類號(hào):TU378.4        文獻(xiàn)標(biāo)識(shí)碼:A        文章編號(hào):1002-848X(2013)19-0038-04
 
Shear strength prediction of prestressed concrete beam-column joints based on modified strut-and-tie model
Wang Guolin1, Meng Shaoping2
(1 School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China;2 Key Laboratory of C & PC Structures, Ministry of Education, Southeast University, Nanjing 210096, China)
 
Abstract: Due to the scarcity of rational models for predicting the shear strength of prestressed concrete (PC) beam-column joints, a modified strut-and-tie model was established. In the proposed model, the effect of prestress was explicitly taken into account. Kupfer-Gerstle biaxial tension-compression failure criterion of concrete was utilized to take account of the concrete softening effect, based on which a simple and convenient formula was derived. A comparison of 21 exterior and interior beam-column joints shows that the model predictions were accurate, consistent and conservative with an overall average test result to prediction of 1.14 and a coefficient of variation of 0.139, and also illustrate its superior accuracy over the design method of Code for design of concrete structures(GB 500102010). It indicates that the proposed model can be employed for design of PC beam-column joints with bonded and unbonded tendons.
Keywords: prestressed concrete; beam-column joint; shear strength; effect of prestress; strut and tie model; biaxial tension-compression failure criterion of concrete
*國家自然科學(xué)基金項(xiàng)目(51308339),上海市教育委員會(huì)科研創(chuàng)新項(xiàng)目(13YZ123)。
作者簡介:王國林,博士,講師,Email: felixwseu@163.com。
 
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