PERFORM-3D中梁自重荷载的细节Key Details on Beam Self-Weight Load in Perform-3D

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P3D技术笔记：自重荷载处理要点解析

两个月没更新，今日更新点小东西，不涉及代码和公式，P3D的忠粉可能会喜欢。
行情日下，不要问我为什么还这么执迷于技术，要问就是“技术让我沉迷，技术让我陶醉，技术让我迷失”。
这样说有点假，但是事实却是，人生短暂，这一辈子也只够我做好技术这一件事了。

自重荷载处理机制

在P3D中，首先需要在 Compound（组件）页面定义框架构件组件时，于 Self Weight 输入单位长度重量。程序将自动计算构件长度，并执行以下运算： 节点荷载 = 单位长度重量 × 构件长度 ÷ 2

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图|Perform-3D自重荷载（CSI PERFORM-3D）
荷载类型定义差异

若需沿长度方向施加荷载（如水平梁单元），需通过单元分布荷载实现。通过Load Patterns荷载类型定义的自重荷载界面如下：

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图| Perform-3D荷载类型中自重荷载（CSI PERFORM-3D）

点击 Plor Loads 后显示荷载分布：

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图 | Perform-3D荷载类型中自重荷载显示为节点荷载（CSI PERFORM-3D）
工程影响分析
关键发现
  • 节点荷载直接传递至竖向构件（柱/墙）
  • 当梁自重产生的弯矩不可忽略时（如悬挑梁/大跨度梁），可能导致评估偏不安全
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    图 | 节点荷载直接传递给柱梁不产生弯矩
工程实例验证

某框架案例参数：

  • 梁截面：550×700
  • 梁跨度：8m
  • 附加恒载：三角形分布（楼板传递）
  • 外墙线荷载：4.0kN/m
  • 梁自重荷载：7.71kN/m
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图 | 小实例中荷载

红色箭头标示框架，可见自重产生的梁弯矩占比显著

优化建议
  1. 梁单元：将自重转为线荷载输入
  2. 墙/柱单元：保持节点荷载输入（影响较小）
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图 | 将自重荷载作为梁线荷载输入

注：荷载输入方式的差异直接影响结构内力分布，建议通过对比分析验证模型合理性。

P3D Technical Notes: Key Insights on Self-Weight Load Handling

Two months without an update — time for a quick one! No code or formulas here, but loyal P3D fans might find this useful.
Despite market downturns, why do I remain obsessed with technical work? Because “Technology intoxicates me, technology fascinates me, technology consumes me.”
This sounds dramatic, but the truth is: life is short, and I only have time to master one thing — technical excellence.

Self-Weight Load Mechanism

In Perform-3D, define the unit length weight of frame components in the Compound (Component) page when creating structural elements. The program automatically calculates member lengths using:
Nodal Load = Unit Weight × Member Length ÷ 2

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Fig. | Perform-3D Self-Weight Load (CSI PERFORM-3D)
Load Pattern Definition Differences

For lengthwise loads (e.g., horizontal beams), use element distributed loads. The self-weight definition interface under Load Patterns appears as:

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Fig. | Self-Weight Load in Load Patterns (CSI PERFORM-3D)

Clicking Plot Loads displays the load distribution:

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Fig. | Self-Weight Displayed as Nodal Loads (CSI PERFORM-3D)

Engineering Impact Analysis

Critical Observations
  • Nodal loads transfer directly to vertical members (columns/walls)
  • When beam self-weight causes significant bending (e.g., cantilevers/long spans), this may lead to underestimated safety margins
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Fig. | Nodal Loads Transfer Directly to Columns Without Bending Moments
Engineering Validation Case

Frame Parameters:

  • Beam Section: 550×700
  • Beam Span: 8m
  • Additional Dead Load: Triangular distribution (slab load transfer)
  • Exterior Wall Load: 4.0kN/m
  • Beam Self-Weight: 7.71kN/m
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Fig. | Load Distribution in Sample Frame

Red arrows highlight beam moments — self-weight contributes significantly

Optimization Recommendations
  1. Beam Elements: Convert self-weight to distributed loads
  2. Wall/Column Elements: Retain nodal load input (minimal impact)
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Fig. | Inputting Self-Weight as Beam Distributed Load

Note: Load input methods directly affect structural internal force distribution. Recommend comparative analysis to validate model accuracy.

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