- 摘 要
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(1 上海應用技術(shù)學院土木建筑與安全工程學院，上海 200235； 2 同濟大學土木工程學院，上海 200092)
［摘要］將拉壓模量不同的概念引入到樁筏基礎(chǔ)柔度矩陣中，建立了樁筏基礎(chǔ)簡化分析模型，板單元采用基于廣義協(xié)調(diào)元思想的厚薄板通用單元，解決了剪切閉鎖現(xiàn)象；樁周土體的作用采用荷載傳遞法，能夠考慮由于沉樁、土固結(jié)引起的有效應力變化以及樁的加載過程對荷載傳遞函數(shù)的影響。討論了地基土拉壓模量比對樁筏基礎(chǔ)沉降、地基土分擔比和筏板內(nèi)力的影響規(guī)律。提出現(xiàn)有工程設計中，對于多層、小高層建筑筏板較薄的情況，不考慮拉壓模量不同，會低估筏板的實際彎矩，存在安全隱患。
［關(guān)鍵詞］樁筏基礎(chǔ)；拉壓模量；非線性共同作用；基底土反力；荷載分擔比
Analysis on different modulus in tension and compression for piled rafts
Li Wei1, Zhu Cimian2(1 School of Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 200235, China;2 College of Civil Engineering, Tongji University, Shanghai 200092, China)
Abstract:Different modulus in tension and compression theory was embedded in pile foundation displacement field. A simple method was proposed for piled rafts. For solution of shear locking, the thin-thick plate element based on generalized confirming for raft was used. The soil behavior of response of individual piles nonlinearity was modeled using load-transfer function. The method was derived to simulate various factors, including effective stress changes due to pile installation and soil reconsolidation, and effects of pile loading. By examples, it further studied that the responses of foundation average settlement, foundation difference settlement, load bearing proportion, soil reaction distributing and raft internal force with the ratio of tensile modulus to compressive modulus. The calculated result indicates that the soil reaction on for medium tall building and multistory building, elastic solution tends to obtain a lower value, and internal force of raft is inexact.
Keywords:piled raft; modulus in tension and compression; nonlinear interaction; soil reaction; load bearing proportion
作者簡介：李偉，博士，講師，Emial:liwei1478@gmail.com。
參考文獻
［1］POULOS H G, DAVIS E H. Pile foundation analysis and design［M］. New York: Wiley, 1980.
［2］龔曉南.油罐軟粘土地基性狀［D］.杭州：浙江大學，1984.
［3］王國光.拉壓模量不同彈性理論解及樁基沉降計算［D］.杭州：浙江大學，2002.
［4］龍志飛，岑松.有限元法新論——原理·程序·進展［M］.北京：中國水利水電出版社，2001.
