计算书
摘要: 本设计上部结构为钢筋混凝土简支梁桥,标准跨径为14米×3,桥面净空:净—8+2×,采用重力式桥墩和桥台。桥梁全长为42m,桥面总宽10m,%,,%;桥垮轴线为直线,设计荷载标准为:公路-Ⅱ级,人群荷载3 kN/m。本文主要阐述了该桥设计和计算过程,首先对主桥进行总体结构设计,然后对上部结构进行内力、配筋计算,再进行强度,应力及变形验算,最后进行下部结构设计和结构验算。同时,也给出了各部分内容相关的表格与图纸。通过这次设计不但了解设计桥梁的各个步骤,而且也能熟练的运用AUTOCAD进行制图。
关键词: 现浇混凝土 T形简支桥梁 重力式桥台 重力式桥台 结构设计 验算强度
ABSTRACT: The design for the upper structure of reinforced concrete beam bridge, standard span for 14 meters x 3, bridge deck headroom: net - 8 + 2 x meters, adopt the piers and gravity type abutment. Bridge deck 42m, stretches for total wide ZongPo %, 10m bridge deck, deck design elevation at the center of the slope for rice, %; Bridge collapse, design load for linear axis for: highway - Ⅱ standard, the crowd load level 3 kN/m. This paper mainly expounds the bridge design and calculation process, first makes an overall structure design of bridge, then to the upper structure force, reinforcement calculation, again, stress and deformation strength, then check the structure design and structure checking. At the same time, also gives the relevant sections of the form and drawings. This design not only understand each step of designing the bridge, but also can skilled use AUTOCAD for drawing.
Keywords: cast-in-situ concrete simply-supported t-shaped bridge abutment gravity type abutment gravity type structure design checking intensity
引言
设计基本资料
1、结构选型与布置:上部结构为钢筋混凝土简支梁桥,标准跨径为14米×3,桥面净空:净—8+2×,采用重力式桥墩和桥台
设计荷载:公路—Ⅱ级,环境类别Ⅰ类,设计安全等级二级。
河床地面线为(从左到右,高程/离第一点的距离,单位:米):0/0,-3/2,-5/4,-9/6,-12/9,-14/10, -10/12,-8/14,-7/16,-6/18,-5/20,-3/22,-4/24,-5/26,-7/28,-10/30,-13/32,-15/32,-16/34,-10/36,-6/38,-2/40,0/42。
桥台后填土容重:18KN/m3,内摩擦角φ= 18°,粘聚力c =20 kPa。
材料容重:素混凝土24KN/m3,钢筋混凝土25 KN/m3,沥青混凝土23 KN/m3
,每侧栏杆及人行道的重量按6 KN/m计
%,
场地土条件
设计水位 -7米,无侵蚀性,枯水期施工,枯水期水位-10m,气温10℃。
地质勘察资料见下表:
土层
厚度(m)
天然重度kN/m3
承载力标准值kN/m2
承载力修正系数
预制桩极限侧阻力标准值qsik,极限端阻力标准值qpk(kPa
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