地裂缝对西安火车站改扩建东配楼结构性能的影响
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摘要
西安火车站改扩建中新建东配楼跨越了西安f 3地裂缝。为了对地裂缝进行合理避让,整体结构被分割成三个形状不规则的单体,各单体之间通过大跨度桁架和连廊连接。为了解地裂缝活动对结构性能的影响,深入分析大跨桁架的支座选型、结构关键杆件内力和层间位移角等性能指标。结果表明:桁架支座采用左端铰接、右端滑动布置时,地裂缝荷载对滑动支座水平位移和竖向反力影响相对较小;地裂缝荷载作用会引起结构局部梁、柱内力发生较大变化,而对桁架杆件影响较小;在30年地裂缝荷载作用下,大区和大三角区的二层纵向层间位移超出GB 50011—2010《建筑抗震设计规范》限值,应适当加强该区域结构的纵向刚度。
The east annexe of Xi'an station reconstruction project will be built across the Xi'an f3 ground fissure. In order to reasonably keep away from the ground fissure,the whole structure will be divided into three irregularly shaped parts,and each part is connected to other by a long-span truss and a connecting corridor. In order to study the effect of ground fissure action on structure performance,the support type selection of the long-span truss,the internal force and the story drift angle of the structure key members were studied in detail. The results showed that when the support type of the long-span truss was hinged at the left and slipping at the right,the horizontal displacement and vertical reaction force of slipping supports were relatively smaller under the influence of the ground fissure load. The internal force of local beams and columns would be greatly changed by the action of the ground fissure load,but the members of the long-span truss were less affected. The second layer longitudinal story drift angles of large area and large triangle area exceed the specification limit value of Code for Seismic Design of Buildings( GB 50011—2010)under the 30-year ground fissure load. Therefore,the longitudinal stiffness of the structure of these areas should be appropriately strengthened.
The east annexe of Xi'an station reconstruction project will be built across the Xi'an f3 ground fissure. In order to reasonably keep away from the ground fissure,the whole structure will be divided into three irregularly shaped parts,and each part is connected to other by a long-span truss and a connecting corridor. In order to study the effect of ground fissure action on structure performance,the support type selection of the long-span truss,the internal force and the story drift angle of the structure key members were studied in detail. The results showed that when the support type of the long-span truss was hinged at the left and slipping at the right,the horizontal displacement and vertical reaction force of slipping supports were relatively smaller under the influence of the ground fissure load. The internal force of local beams and columns would be greatly changed by the action of the ground fissure load,but the members of the long-span truss were less affected. The second layer longitudinal story drift angles of large area and large triangle area exceed the specification limit value of Code for Seismic Design of Buildings( GB 50011—2010)under the 30-year ground fissure load. Therefore,the longitudinal stiffness of the structure of these areas should be appropriately strengthened.
引文
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[2] LEONARD R J. An Earth Fissure in Southern Arizona[J]. Journal of Geology,1929,37(8):765-774.
[3] SHENG Z P,HELM D C,LI J. Mechanisms of Earth Fissuring Caused by Groundwater Withdrawal[J]. Environmental and Engineering Geoscience,2003,9(4):313-324.
[4]彭建兵,范文,李喜安,等.汾渭盆地地裂缝成因研究中的若干关键问题[J].工程地质学报,2007,15(4):433-440.
[5]熊仲明,韦俊,龚宇森,等.高烈度多维多点地震作用下某跨越地裂缝框剪结构的地震响应分析[J].西安建筑科技大学学报(自然科学版),2015,47(3):309-315.
[6]陕西省建设厅.西安地裂缝场地勘查与工程设计规程:DBJ 61-6—2006[S].西安:西安市规划局,2006.
[7]李新生,王静,王万平,等.西安地铁二号线沿线地裂缝特征、危害及对策[J].工程地质学报,2007,15(4):463-468.
[8]黄强兵,彭建兵,邓亚虹,等.西安地铁2号线隧道穿越地裂缝带的设防参数[J].岩土力学,2010,31(9):2882-2888.
[9]熊田芳,邵生俊,王天明,等.西安地铁正交地裂缝隧道的模型试验研究[J].岩土力学,2010,31(1):179-186.
[10]石玉玲,门玉明,彭建兵,等.地裂缝对不同结构形式桥梁桥面的破坏试验研究[J].岩土力学,2009,30(10):2917-2922.
[11]熊仲明,王军良.西安地区某跨地裂缝建筑物的计算和分析[J].建筑结构,2011,41(10):79-83.
[12]王旭.西安火车站北站房及高架候车室地裂缝的勘察、评价及对策[J].铁道标准设计,2015,59(4):102-105.