拱桥支架计算书和图纸

'目录1前言..........................................................................................................................31.1工程概况................................................................................................................31.2编制依据................................................................................................................32计算过程..................................................................................................................32.1计算荷载................................................................................................................32.2计算工况................................................................................................................32.3主纵梁支架计算.....................................................................................................42.3.1荷载计算..............................................................................................................................42.3.2顺桥向2I25a计算................................................................................................................42.3.3、钢管验算............................................................................................................................5①钢管压杆稳定性验算..............................................................................................................5②钢管强度验算..........................................................................................................................5③钢管抗倾覆稳定性验算..........................................................................................................72.4主拱支架计算........................................................................................................82.4.1荷载计算............................................................................................................................82.4.22I25a纵向分配梁计算......................................................................................................82.4.3钢管验算...............................................................................................................................8①钢管压杆稳定性验算..............................................................................................................8②钢管强度验算..........................................................................................................................8③钢管抗倾覆稳定性验算........................................................................................................102.5副拱支架计算......................................................................................................122.5.1荷载计算.............................................................................................................................122.5.22I25a纵桥向分配梁计算................................................................................................122.5.3钢管验算..........................................................................................................................13①钢管压杆稳定性验算............................................................................................................13②钢管强度验算........................................................................................................................14③钢管抗倾覆稳定性验算........................................................................................................153结论........................................................................................................................164附图........................................................................................................................162 1前言1.1工程概况枫木互通被交道跨线桥工程主桥上部结构为结合梁—钢拱组合体系拱桥，本工程分为纵梁、主拱、副拱以及横梁等构件，其临时支架形式为钢管支架，其布置见钢管支架布置图。钢管采用Ф426×8㎜钢管，钢管底采用50cm高砼扩大基础，钢管顶部建立一个小平台用于各节段梁拱安放。1.2编制依据《公路工程技术标准》（JTGB01-2003）《公路桥涵设计通用规范》（JTGD60-2004）《公路桥涵钢结构及木结构设计规范》（JTJ025-86）《钢结构设计规范》（GB50017-2003）《公路桥涵施工技术规范》（JTG/TF50-2011）《建筑结构荷载规范》（GB50009-2012）《公路桥涵地基与基础设计规范》（JTJD63-2007）其它相关的设计规范、规程2计算过程2.1计算荷载a、主副拱、主梁各节段自重b、风荷载：查《建筑结构荷载规范》表E.5雪压和风压表，得海口市502年一遇的ω0=0.75kN/m。2.2计算工况表3.5-1工况分析表计算部位计算工况计算荷载说明顺桥向分配梁承载力主拱自重按集中荷载计主拱支架钢管压杆稳定性验算主拱自重钢管强度验算主拱自重、风荷载3 吊装时主拱结构自重对抗倾覆风荷载、钢管基础自钢管抗倾覆验算有利故只需计算不吊装时抗倾重覆验算顺桥向分配梁承载力副拱自重按集中荷载计钢管压杆稳定性验算副拱自重钢管强度验算副拱自重、风荷载副拱支架吊装时副拱结构自重对抗倾覆风荷载、钢管基础自钢管抗倾覆验算有利故只需计算不吊装时抗倾重覆验算顺桥向分配梁承载力主梁自重按集中荷载计钢管压杆稳定性验算主梁自重钢管强度验算主梁自重、风荷载主梁支架吊装时主梁结构自重对抗倾覆风荷载、钢管基础自钢管抗倾覆验算有利故只需计算不吊装时抗倾重覆验算2.3主纵梁支架计算2.3.1荷载计算主纵梁拼接时共有20条接缝，且当主纵梁安装完毕后，桥梁横梁、小纵梁等荷载也将作用于主纵梁支架，故支架的受力需要考虑此部分的荷载。各接缝支撑点荷载计算表左侧梁总重右侧梁总重小纵梁平均合计重量接缝荷载序号（Kg）（Kg）（Kg）（Kg）（t）126073.2214401.5639.4220876.7825.05214401.526617.6639.4221148.9725.37326617.626617.6639.4227257.0232.70426617.613298.8639.4220597.6224.72513298.818456.3639.4216516.9719.820备注：其余接缝支撑点对称分布，荷载已考虑1.2恒载分项系数。2.3.2顺桥向2I25a计算（1）受力分析2I25a工字钢直接放置于纵向钢管顶部，最不利为⑦⑨号支架，最大跨径3.2m。2I25a工字钢间接承受主纵梁荷载，由于单条焊缝处采用2根2I25a工字钢承担荷载，故保守取327/2=163.5KN为集中力。（2）材料力学性能参数及指标4 I25工字钢横梁：64I=50.17´10mm53W=.401´10mm2A=4851mm（3）力学计算荷载作用下受力简化图示如下：PL163.5KN´3.2mM===130.8kNm；max446M130.810´Nmmmax[]，合格；s===163.1MPa