鋼筋混凝土和預(yù)應(yīng)力混凝土梁式橋.ppt

,BRIDGE ENGRG PART II,Part 2 RC & PC beam bridge 第二篇 鋼筋混凝土和預(yù)應(yīng)力混凝土梁式橋,Chapter 3 第三章 Analysis of simple supported beam bridge 簡(jiǎn)支梁橋的計(jì)算,SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN,3.3 Computation of Coefficients of Transverse Distribution of Loads 荷載橫向分布計(jì)算,1. Introduction 概述,1）Influence line and influence surface 影響線與影響面 2）Concept about the transverse distributive coefficient 荷載橫向分布概念 3）Method for computing the transverse distributive coefficient 荷載橫向分布系數(shù)計(jì)算方法,SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN,Simple supported beam簡(jiǎn)支梁one dimension一維桿件 Influence line of the Internal force 內(nèi)力影響線 S= P 1(x), 1(x),P,o,x,z,3.3 Computation of Coefficients of Transverse Distribution of Loads 荷載橫向分布計(jì)算,1. Introduction 概述,SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN,Superstructure system上部結(jié)構(gòu)系-two dimension 二維 Influence surface of the Internal force 內(nèi)力影響面, (x,y),P (x, y),o,x,y,z,S= P (x,y),3.3 Computation of Coefficients of Transverse Distribution of Loads 荷載橫向分布計(jì)算,1. Introduction 概述,SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN,2） Concept about the transverse distributive coefficient 荷載橫向分布概念,若： S= P (x,y) P 2(y) 1(x),對(duì)比： S= P 1(x),可以看出系數(shù) 2(y) 的作用相當(dāng)于將荷載P沿橫向分配給指定的梁，使該梁承受P 的荷載。這樣一來(lái)， 可以將二維問(wèn)題轉(zhuǎn)化為一維問(wèn)題處理。,3.3 Computation of Coefficients of Transverse Distribution of Loads 荷載橫向分布計(jì)算,1. Introduction 概述,SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN,Diagram of the Coefficients of Transverse Distribution of Loads 橫向分布系數(shù)圖示,3.3 Method for computing Coefficients of Transverse Distribution of Loads 荷載橫向分布系數(shù)計(jì)算,Two special cases 荷載橫向分布集系數(shù)的兩種特殊情形,m3=1,m3=1/5,Rigid transverse connection 橫梁剛度無(wú)限大,No transverse connection 橫向無(wú)聯(lián)系,SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN,1. Introduction 概述,3）荷載橫向分布系數(shù)計(jì)算方法 杠桿原理法 Method based on mechanics of leverage 偏心壓力法 Method based on stiffness transverse connection 橫向鉸接梁（板）法 橫向剛接梁法 比擬正交異性板法,SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN,3.3 Method for computing Coefficients of Transverse Distribution of Loads 荷載橫向分布系數(shù)計(jì)算,2. Method based on mechanics of leverage 杠桿原理法,1）Assumption 原理假設(shè) This method is based on the weak connection between girders 忽略主梁之間的橫向聯(lián)系作用，即假設(shè)橋面板在主梁上斷開(kāi)。,3.3 Method for computing the transverse distributive coefficient 荷載橫向分布系數(shù)計(jì)算,SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN,2）適用范圍 雙主梁橋 有水平縱向縫的裝配式橋 荷載作用于支點(diǎn)處 無(wú)中間橫隔梁的梁橋,3.3 Method for computing the transverse distributive coefficient 荷載橫向分布系數(shù)計(jì)算,SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN,2. Method based on mechanics of leverage 杠桿原理法,2. 杠桿原理法,杠桿原理 2#梁承受的荷載為：,P/2,R1,P/2,R2,3,1,2,1,2,支座反力影響線,3.3 Method for computing the transverse distributive coefficient 荷載橫向分布系數(shù)計(jì)算,SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN,2. 杠桿原理法,3）