文档介绍：1 基本概念
构件安全性指标:
强度要求所谓强度(strength),是指构件抵抗破坏的能力。
刚度要求所谓刚度(stiffness),是指构件抵抗变形的能力。
稳定性要求所谓稳定性(stability),是指构件保持其原有平衡形态的能力。
工程材料力学行为(behaviours of materials ):
工程材料在外力和温度的作用下所表现出来的力学性能
(mechanical properties)和失效(failure)行为。
2 应力
2 应力
A 6000-nail bed: 20 grams/ nail
2 应力
49 plastic cups
13 N /cup< 19 N
2 应力
Uniform stress distribution
Non-uniform stress distribution
2 应力
one of the flat shoes
the high-heel
elephant has a weight of about 5000 kg
each foot is about
3 刚度
铰接结构:
梁式结构:
使尽可能多的杆件内力为0;
任一杆件内力都不应显著大于非0杆件内力;
所有非0杆件内力都应尽可能的小。
3 刚度
3 刚度
The more direct the internal force paths, the stiffer the structure.
The more uniform the distribution of internal forces, the stiffer the structure.
The smaller the internal forces, the stiffer the structure.
1 基本概念
B
A
C
Bracing members should be provided in each storey from the support (base) to the top of the structure.
Bracing members in different storeys should be directly linked.
Bracing members should be linked in a straight line where possible.