關(guān)于樁基設(shè)計(jì)的分析
關(guān)于樁基設(shè)計(jì)的分析
摘要:本文作者通過對(duì)樁基豎向承載力計(jì)算分析入手,闡述了在JCCAD中如何正確按規(guī)范要求布樁,指出了幾種優(yōu)化樁基設(shè)計(jì)的方法,對(duì)樁的選型做了簡(jiǎn)述,總結(jié)了承臺(tái)、聯(lián)系梁、承臺(tái)梁、筏板的計(jì)算應(yīng)注重的問題。
關(guān)鍵詞: 樁基;設(shè)計(jì);分析
Abstract: Based on the calculation and analysis of the pile foundation vertical bearing capacity, this paper elaborates on how to correctly cloth pile according to the specifications requirements in JCCAD, points out several optimization pile foundation design method, discuss briefly its selection and summarizes the problems needing attention of cap, link beam, beam, raft calculation.
Key words : pile foundation; design; analyze
中圖分類號(hào):TU7文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):2095-2104(2012)
樁基工程是一項(xiàng)繁重而復(fù)雜的過程,在此過程中設(shè)計(jì)人員應(yīng)在深刻理解規(guī)范的基礎(chǔ)上,注重概念設(shè)計(jì),選擇合適的樁型,優(yōu)化樁的布置方式,正確合理的使用計(jì)算軟件,使上部結(jié)構(gòu)荷載直接、有效、分散的傳遞到土中,統(tǒng)籌兼顧,從各方面使之合理化,做到“安全適用、技術(shù)先進(jìn)、經(jīng)濟(jì)合理、確保質(zhì)量、保護(hù)環(huán)境”。
1 樁基的豎向承載力計(jì)算與JCCAD中荷載的選擇
根據(jù)《建筑樁基技術(shù)規(guī)范》JGJ 94-2008,樁基的豎向承載力計(jì)算應(yīng)符合下列要求:
1.1 荷載效應(yīng)標(biāo)準(zhǔn)組合:
1.1.1 軸心豎向力作用下Nk≤R;
1.1.2 偏心豎向力作用下除滿足
1.1.3 還應(yīng)滿足Nk≤1.2R(2)
1.2 地震作用效應(yīng)和荷載效應(yīng)標(biāo)準(zhǔn)組合:軸心豎向力作用下NEk≤1.25R;