桥梁工程PPT课件-第2篇第3章-简支梁桥的计算--4横隔梁内力计算A.ppt

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1、BRIDGE ENGRGPART IIPart 2 RC & PC beam bridge第二篇 钢筋混凝土和预应力混凝土梁式桥Chapter 3 第三章 Analysis of simple supported beam bridge 简支梁桥的计算SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN 3.5 Computing the internal force on transverse beam 横隔梁内力计算1. Load distributed on transverse beam作用于横隔梁上的荷载n沿桥跨方向确定横隔梁上的计算荷

2、载 假定荷载在相邻横隔梁之间按杠杆原理法传递。 按一列汽车车道荷载轮重分布给中横梁的计算荷载为：Pklay1qklaakkkkqlqyPqyPP11021)(21SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN 3.5 Computing the internal force on transverse beam 横隔梁内力计算rlala人群arrrlpqP0rSCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN1. Load distributed on transverse beam作用于横

3、隔梁上的荷载 3.5 Computing the internal force on transverse beam 横隔梁内力计算. Computing the internal force based on the stiffness transverse beam 偏压法计算横隔梁内力nModel 计算模型 continuous beam on elastic support 横隔梁相当于弹性支撑上的连续梁 Ri=?PR1R2R3R4R5PSCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN 3.5 Computing the intern

4、al force on transverse beam 横隔梁内力计算n 横隔梁的内力 当荷载P作用于r截面左边时，截面上的弯矩和剪力：R1R2R3R4R5P=1reb1b2P=1SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN. Computing the internal force based on the stiffness transverse beam 偏压法计算横隔梁内力 3.5 Computing the internal force on transverse beam 横隔梁内力计算n 横隔梁的内力 当荷载P作用于r截面左

5、边时，截面上的弯矩和剪力：R1R2R3R4R5P=1reb1b2P=1ebRebRbRMiir左122111121左irRRRQSCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN. Computing the internal force based on the stiffness transverse beam 偏压法计算横隔梁内力 3.5 Computing the internal force on transverse beam 横隔梁内力计算n 横隔梁的内力 当荷载P作用于r截面右边时，截面上的弯矩和剪力：R1R2R3R4R5P=1

6、rb1b2P=1右iirbRbRbRM2211右irRRRQ21SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN. Computing the internal force based on the stiffness transverse beam 偏压法计算横隔梁内力 3.5 Computing the internal force on transverse beam 横隔梁内力计算n 横隔梁的内力 aar截面弯矩影响线P=1e1r截面剪力影响线P=1eSCHOOL OF TRANSPORTATION, WUT PRODUCED BY：

7、X J CHEN. Computing the internal force based on the stiffness transverse beam 偏压法计算横隔梁内力 3.5 Computing the internal force on transverse beam 横隔梁内力计算n 横隔梁的内力影响线一般横隔梁的弯矩在靠近桥中心线的截面较大，如A、B截面剪力则在靠近桥两侧边缘处的截面较大,如C、D截面 P=1A BCDSCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN. Computing the internal force

8、based on the stiffness transverse beam 偏压法计算横隔梁内力 3.5 Computing the internal force on transverse beam 横隔梁内力计算n 横隔梁的内力影响线 1116R1R2R321263136梁处横隔梁截面的弯矩影响线dddM22211131ddM3231233ddM2616236M31M33M36SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN. Computing the internal force based on the stiffness tra

9、nsverse beam 偏压法计算横隔梁内力 3.5 Computing the internal force on transverse beam 横隔梁内力计算n 横隔梁的内力影响线 梁处横隔梁截面的弯矩影响线dddM22211131ddM2616236M31M36aa2dSCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN. Computing the internal force based on the stiffness transverse beam 偏压法计算横隔梁内力 3.5 Computing the internal fo

10、rce on transverse beam 横隔梁内力计算n 横隔梁的内力影响线 梁、梁之间横隔梁截面的弯矩影响线ddddM5 . 25 . 05 . 15 . 23121111)43(dddM5 . 05 . 15 . 23626166)43(M31M362.5dSCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN. Computing the internal force based on the stiffness transverse beam 偏压法计算横隔梁内力 3.5 Computing the internal force on

11、 transverse beam 横隔梁内力计算n 横隔梁的内力影响线 梁处横隔梁截面的剪力影响线1211121右Q261636右QQ21Q2611SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN. Computing the internal force based on the stiffness transverse beam 偏压法计算横隔梁内力 3.5 Computing the internal force on transverse beam 横隔梁内力计算n 横隔梁的内力计算 l确定作用在中横隔梁上的计算荷载 akkkkqlq

12、yPqyPP11021)(21Pklay1qklaSCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN 3.5 Computing the internal force on transverse beam 横隔梁内力计算n 横隔梁的内力计算l绘制中横隔梁的内力影响线l布置荷载，计算截面内力 iqPS01Q21Q26M31M36P/2P/2P/2P/2SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN 3.5 Computing the internal force on transverse beam 横隔梁内力计算n 横隔梁的内力计算l荷载组合忽略横隔梁恒载内力，只考虑活载组合SCHOOL OF TRANSPORTATION, WUT PRODUCED BY：X J CHEN