长春市青少年活动中心V形柱转换结构设计

Conversion structural design of V-shaped columns of Youth Activity Center in Changchun

长春市九台区青少年活动中心平面呈Z字形,存在平面凹凸不规则、扭转不规则和竖向构件不连续等抗震不利因素,通过设置两道结构缝,将结构分为A1,A2和A3三个区。A3区屋面高度19m,采用框架-剪力墙结构,端部底层通过两榀V形柱对上部小柱网进行结构转换,是本工程结构设计的重点和难点。对A3区结构进行了抗震性能化设计,通过设定适宜的抗震性能目标,采用YJK-EP软件对结构进行了弹塑性时程分析,结构满足＂大震不倒＂的设防要求。转换构件为型钢混凝土,分别采用XTRACT和ABAQUS软件进行了转换柱正截面承载力验算和梁柱节点受力分析,确保了构件和节点连接的可靠性。

The plane of Youth Activity Center in Jiutai District of Changchun is＂Z-shaped＂arrangement. There are seismic adverse factors of planar concave-convex irregularity,torsional irregularity and vertical component discontinuity. By setting two structural joints,the structure is divided into three parts： A1,A2 and A3. In the A3 area,the roof height is 19 m,and the frame-shear wall structure is adopted. Upper small-span column is transformed by two pieces of V-shaped columns at the ends of bottom layer,which is the key and difficult point in the structural design of the project. Performance-based seismic design was conducted on structure in A3 area by setting suitable seismic performance objectives,and YJK-EP software was used to conduct elasto-plastic time-history analysis of the structure to make the structure meet the fortification requirements of＂no collapsing under rare earthquake＂. The conversion components are steel reinforced concrete. XTRACT and ABAQUS software were applied to check the normal section bearing capacity of the conversion column and the stress analysis of the beam-column joints respectively. The reliability of the components and joints was ensured.