摘要
GB50017—2003《钢结构设计规范》中规定，桁架杆件采用节点板连接时，计算模型的连接方式可简化为铰接。现对1榀18m跨钢桁架进行设计荷载下的三分点加载试验研究，并与软件计算结果对比，得到桁架内力和位移响应，得出最优计算模型。结果表明：1）桁架结构中节点对腹杆约束影响范围为（0．15～0．3）杆件长度，建议腹杆计算长度取0．85杆件长度较为安全；2）采用铰接计算模型校核正常使用状态下的挠度较为合适；采用刚接模型校核应力较为合理。
Code for Design of Steel Structures （GB 50017-2003） specifies that the connection of a calculated model should be simplified as hinged connection when gusset plate is used to connect the members of a truss. Third point loading test on a 18 m-span steel truss under the design load was carried out, whose results were compared with the results calculated by the software. The force and displacement response of the truss, as well as the optimal calculation model were got. The results shows that： 1）The scope of restraining influence of the nodes on the web members in the truss structure is 0.15-0.3 times of the length of the rod member, it is suggested that the calculated length of the web member should be 0. 85 times of the length of the member. 2） Hinged mechanical model is fit for verification of the deflection under normal service condition, rigid mechanical model is fit for verification of the stress.
出处
《钢结构》
2013年第8期1-5,共5页
Steel Construction
基金
四川省科技支撑计划(2011GZ0043)
四川省教育厅应用基础项目(12ZB157)
西南科技大学试验室开放基金项目(13syjs-38)
关键词
钢桁架
静力试验
力学模型
节点约束
steel truss
static test
mechanics model node constraints
