人字形防屈曲支撑钢框架滞回能层间分布规律研究

发布时间：2018-04-15 11:08

本文选题：人字形中心支撑钢框架 + 远场地震波　；参考：《苏州科技大学》2017年硕士论文

【摘要】：现行抗震规范采用间接考虑延性的基于强度的设计理论,没有充分考虑结构的塑性性能;基于能量的设计方法揉合了力、位移、地震持时等参量,可对结构进行较全面的地震破坏评估。滞回能与结构构件密切相关,其为能量设计方法的主要控制参数,滞回能在结构中的分布是能量设计方法不可或缺的一部分。本文采用ABAQUS软件分析了远近场条件、地震动要素、结构自身参数对人字形防屈曲支撑钢(BRB)框架滞回能层间分布模式影响,进行了如下工作:1.设计了10×3×3.6×7.2、15×3×3.6×7.2、15×3×3.0×7.2、15×3×3.6×7.8、15×5×3.6×7.2和20×3×3.6×7.2(层数×跨数×层高(m)×跨度(m))六种人字形防屈曲支撑钢框架算例,针对每一个算例选取符合选波原则的自然地震波和人工地震波。2.针对上述六种算例进行弹塑性时程分析,分析了远近场、楼层数、峰值加速度(PGA)、阻尼比、强震持时、结构层高、跨度、跨数和材料切线模量对人字形防屈曲支撑结构滞回能层间分布模式影响。结果表明:在远场地震下地震动峰值加速度和楼层数对防屈曲支撑钢框架滞回能层间分布影响大,近场脉冲地震对结构具有冲击效应,层间侧移角明显超过规范规定值。3.本文给出了远场罕遇地震下人字形防屈曲支撑钢框架滞回能层间分布拟合公式与远场下基于滞回能的人字形防屈曲支撑钢框架设计流程。并运用能量设计方法在相同设计条件下重新设计15×3×3.6×7.2结构。结果表明:结构满足规范规定侧移需求,层间刚度分布均匀。对比两种不同设计方法设计的15层结构可知,结构大震下层间最大侧移角基本不变,能量设计方法下结构用钢量相比减少了 10%。
[Abstract]:The current seismic code adopts the strength based design theory which indirectly considers ductility, and does not fully consider the plasticity of the structure, and the energy-based design method combines the parameters of force, displacement, earthquake duration, etc.The structure can be comprehensively evaluated for earthquake damage.The hysteretic energy is closely related to the structural members and is the main control parameter of the energy design method. The distribution of the hysteresis energy in the structure is an indispensable part of the energy design method.In this paper, the effects of far and near field conditions, ground motion elements and structural parameters on the distribution of hysteretic energy between layers of herringbone braced steel frame are analyzed by using ABAQUS software. The results are as follows: 1.Six examples of 10 脳 3 脳 3. 6 脳 7. 2 脳 3 脳 3 脳 3. 6 脳 7. 2 + 15 脳 3 脳 3 脳 3. 0 脳 7. 2 脳 3 脳 3 脳 3. 6 脳 7. 6 脳 7. 2 and 20 脳 3 脳 3. 6 脳 7. 2 (layers 脳 span 脳 height) 脳 span braced steel frames are designed. For each case, natural seismic waves and artificial seismic waves.Based on the elastoplastic time-history analysis of the six examples mentioned above, this paper analyzes the far and near field, the number of floors, the peak acceleration, the damping ratio, the height and span of the structure when strong earthquake is sustained.The effects of span number and material tangent modulus on the hysteretic energy distribution pattern of herringbone braced structures are investigated.The results show that the peak acceleration of ground motion and the number of floors have great influence on the distribution of hysteretic energy of steel frame with buckling braced steel frame under the far-field earthquake. The near-field pulse earthquake has impact effect on the structure, and the lateral displacement angle between layers is obviously higher than the standard value of .3.In this paper, a fitting formula for the distribution of hysteretic energy between the hysteretic energy layers of a herringbone braced steel frame and a hysteretic braced steel frame design flow chart based on hysteretic energy are given under rare earthquake in the far field.The energy design method is used to redesign 15 脳 3 脳 3.6 脳 7.2 structure under the same design conditions.The results show that the structure meets the requirement of lateral displacement and the stiffness distribution is uniform.Compared with the 15-story structure designed by two different design methods, it can be seen that the maximum lateral displacement angle between the lower layers of the structure is basically unchanged, and the amount of steel used in the structure under the energy design method is reduced by 10%.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973

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