桥梁施工钢结构技术规范

桥梁施工钢结构技术规范

桥梁施工钢结构技术规程 1. 形式和尺寸

单层，单跨或多跨，双坡、单坡或多坡，常用屋面坡度小于10?屋面应为压型钢板(夹心板很少用)，外墙除压型板外也可用砌体跨度宜为9,36m(不是限定)，国内最大72m;

高度一般不超过12m，不应大于18m;柱距应与跨度匹配，常用6、7.5、9m常用截面尺寸:单跨:加腋端高L/30左右，高宽比6.5以内，加腋长度(0.15,0.25)L;跨中高(1/50,1/60)L;工形截面高宽比2,5;多跨:中柱加腋端L/25左右，加腋长度(1/45,1/55)L;

单元运输长度?12m.温度区间:纵向不大于300m，横向不大于150m横向为门式刚架(含摇摆柱)，纵向设柱间支撑刚架构件腹板宽厚比允许不超过250，常用150左右刚架为变截面构件，单元间采用高强度螺栓端板连接次结构包括檩条、墙梁、面板、墙架等

2. 适用范围

1)吊车起重量不大于20t的轻中级(A1,A5)桥式吊车或3t悬挂式起重机(有需要并采取可靠技术措施时允许不大于5t)。

2)不适用于有强烈侵蚀性介质的环境。

3)多层钢结构房屋的顶层采用了门式刚架及其屋时者，该部分的设计可参照本规程，但应作整体分析，并作抗震计算。

4)关于排架的应用。 1)钢梁与砼柱宜采用铰接; 2)结构应作整体分析;

3)柱顶位移和横梁挠度应按GB50017

3.调整结构重要性系数设计使用年限为50年时，重要性系数取1.0; 为25年时，重要性系数取不小于0.95，但宜慎用。 3.结构抗震验算规定

1)因自重轻，低矮型，国外报导这种房屋抗震性能相当好。GB50011规定，单层钢结构厂房的规定，“不适用于单层轻型钢结构厂房”。

2)地震对单层钢结构厂房有时控制有时不控制，试设计表明，跨高比大于3.5时一般不控制。地震不控制时宽厚比可按《门规》，地震控制时翼缘和柱长细比应适当减小，斜梁檐口部位和柱的翼缘宽厚比应特别注意，本规程对不同烈度时的要求未作具体规定。

attention to improving the quality and efficiency of development and pay more attention to security and reform the people's livelihood, more focus on maintaining social harmony and stability, and promote the development of township economy in a better and faster, create a new normal XX development and lay a more solid foundation for XX build a well-off society. Completed tasks this year, we must always pay special attention to the primary task of development. XX weak economic base, low levels of development, economic construction is the Center, we have to create conditions for faster economic development, accumulating more wealth, better people's lives. Effort should be made to this year's economic growth, revenue growth, people have maintained a high rate of income growth, GDP growth of more than 15 per cent respectively. Always grasp the fundamental impetus for reform. We are now \behind\

bigger. Only by going all out to hard work, hard work, innovation, reform does not adapt to institutional mechanisms, practices, it is possible to change the face of XX poor, into a well-off society together with people across the country. We want to break the old patterns of thinking, methods and organization of work, bravely and boldly into, making full use of all the advantages, comprehensive reforms, to make all its vitality for development impulse, let full play to all sources of wealth creation. Should always stability

3)试设计表明，无吊车时横向和纵向框架7度可不作抗震验算，但有吊车时，和无吊车8度时，一律应作抗震验算。

4)横向刚架和纵向框架应分别进行抗震计算

5)抗震计算宜采用底部剪力法;反应谱计算时阻尼比取0.05; 6)大跨度结构应按规定考虑竖向地震作用。

7) 当有局部多于一层并与门式刚架相连接的附属房屋时，应按有关规范进行抗震验算(重型楼盖尤其应重视);

8)当设计由抗震控制时，应采取相应的抗震构造措施。构件之间应尽量采用螺栓连接;斜梁下翼缘与刚架柱连接处的腋部宜加强，承载力宜留有余地;该处附近翼缘受压区的宽厚比应适当减小;柱间支撑的连接是关键部位，角钢连接要考虑单面连接和净截面对承载力影响，按高于支撑屈服承载力设计;柱脚锚栓充分考虑抗剪和抗拔要求等。

4.调整钢材设计指标

1)承重结构原则上应采用Q235B级或Q345B级以上钢材制作。

受静荷载的次要构件，允许用Q345A.(Q235A和Q345A都不做冲击韧性试验， B级规定做常温(20?) 冲击，C级规定做0?冲击，D级规定做-20?冲击)

2)Q345钢材16mm以下的，由315 N/mm2改为310N/mm2. 3)高强度螺栓连接应为摩擦型，承压型很少用。

5.屋面活荷载标准值由0.3kN/m2提高到0.5kN/m2，荷载面积,60m2的构件取0.3 kN/m2.两级荷载的必要性。

6.补充檩条风荷载体型系数规定

1)低矮型和非低矮型房屋风荷载的划分和适用条件 2)低矮型房屋风荷载的特点 3)两套荷载不能混用

4)《门规》采用MBMA规定得到荷载规范组支持

5)对檩条受风面积小于10m2风荷载的体型系数作了补充。

例如，角部檩条受风面积A,10m2时为-1.4， A,1m2时为-2.9.墙面风载对受风面积不attention to improving the quality and efficiency of development and pay more attention to security and reform the people's livelihood, more focus on maintaining social harmony and stability, and promote the development of township economy in a better and faster, create a new normal XX development and lay a more solid foundation for XX build a well-off society. Completed tasks this year, we must always pay special attention to the primary task of development. XX weak economic base, low levels of development, economic construction is the Center, we have to create conditions for faster economic development, accumulating more wealth, better people's lives. Effort should be made to this year's economic growth, revenue growth, people have maintained a high rate of income growth, GDP growth of more than 15 per cent respectively. Always grasp the fundamental impetus for reform. We are now \

behind\bigger. Only by going all out to hard work, hard work, innovation, reform does not adapt to institutional mechanisms, practices, it is possible to change the face of XX poor, into a well-off society together with people across the country. We want to break the old patterns of thinking, methods and organization of work, bravely and boldly into, making full use of all the advantages, comprehensive reforms, to make all its vitality for development impulse, let full play to all sources of wealth creation. Should always stability

敏感。

6)风荷载改用50年一遇，基本风压调整系数由1.1改为1.05. 7)风荷载附录简介，封闭式房屋，部分封闭式房屋，敞开式房屋 7.调整结构刚度指标

1)刚架柱顶位移限值，无吊车且采用轻型钢墙板时由1,50改为1/60，有桥式吊车且有驾驶室时由1,240改为1/400，有桥式吊车由地面操作时仍取1/180.

2)斜梁竖向挠度表3.4.2,2注1有误，应采用GB50018如下规定:“对单跨山形门式刚架，L系一侧斜梁的坡面长度”，而不是构件跨度。此外，由于柱顶位移和构件挠度产生的屋面坡度改变值，不应大于坡度设计值的1/3. 3) 跨度大于30m的斜梁宜起拱。

4)表3.4.2-2应为刚架柱顶位移(计算值)的限值。 8. 支撑布置要求

1)圆钢支撑仅能用于无吊车厂房，直径应由计算确定，考虑净截面要求，不得小于10mm.