Opensees建模流程

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https://portwooddigital.com/2021/10/10/failed-to-get-compatible/

解决forceelement不奇异的问题，主要是用了concrete02，使用fiber纤维单元，最好就用Concerete01

The response of one ore more sections is bad, e.g., due to excessive deformations, near singular section stiffness, fiber sections with crappy uniaxial materials like *Concrete23*, or incorrect layout of section fibers, i.e., your fibers are oriented the wrong way for 2D bending or you didn’t discretize in both directions for 3D bending.

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'area': 4.4908925216636,
 'center': (5.037037519294261e-16, 6.798455547513725e-17, 0),
 'Iy': 1.6036630117331723,
 'Iz': 1.603658565534686,
 'ry': 0.5975719802036269,
 'rz': 0.5975711518109235,
 'Ip': 3.2073215772678583,
 'Iyz': -4.295051630465174e-07}

Opensees建模流程

  1. 材料
  2. 纤维截面（SecMesh）
  3. 单元（桥梁按照盖梁、横梁、桥墩、承台、横撑建模）建立（forcebeamcloumn）
  4. 支座
  5. 底部约束（直接fix，或者建立同位置节点，用零长度单元连接，采用规范方法考虑土结相互作用，考虑三向的刚度）