# 751.32 Concrete Pile Cap Intermediate Bents

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## Contents

## 751.32.1 General

### 751.32.1.1 Material Properties

Concrete | |||
---|---|---|---|

Typically, shall consist of: | |||

Class B Concrete (Substructure) | = 3.0 ksi | ||

= 10 |

In addition, Class B-1 Concrete (Substructure) may also be used in special cases (See Project Manager). The following equations shall apply to both concrete classes:

Concrete modulus of elasticity:

Where:

= unit weight of non-reinforced concrete = 0.145 kcf | |

= correction factor for source of aggregate = 1.0 |

Modulus of Rupture: | For minimum reinforcement, | |

For all other calculations, | ||

is in units of ksi |

**Reinforcing Steel**

Minimum yield strength, | = 60.0 ksi | |

Steel modulus of elasticity, | = 29000 ksi |

## 751.32.2 Design

### 751.32.2.1 Limit States and Factors

In general, each component shall satisfy the following equation:

Where:

= Total factored force effect | |

= Force effect | |

= Load modifier | |

= Load factor | |

= Resistance factor | |

= Nominal resistance | |

= Factored resistance |

**Limit States**

The following limit states shall be considered for bent design:

- STRENGTH – I
- STRENGTH – III
- STRENGTH – IV
- STRENGTH – V
- SERVICE – I
- FATIGUE

See LRFD Table 3.4.1-1 and LRFD 3.4.2 for Loads and Load Factors applied at each given limit state.

**Resistance factors**

- STRENGTH limit states, see LRFD 5.5.4.2
- For all other limit states, = 1.00

## 751.32.3 Details

### 751.32.3.1 General

Part Elevation | Part Section |
---|

### 751.32.3.2 Front Sheet

Note: | The following are details and dimensions for the Plan View on the Front Sheets. |

Details for unsymmetrical roadways will require dimensions tying Centerline Lane to Centerline Structure. |

## 751.32.4 Reinforcement

### 751.32.4.1 General

Part Elevation | Section Thru Beam |
---|---|

Part Plan |

* #4 Bars () not required for Double-Tee structures | |

Reinforcement Under Bearings | |
---|---|

Transverse Beam Steps - Over 3" (also, Steps Accumulating Over 3") |

Part Plan | |
---|---|

Over 3" thru 12" | Over 12" |

Longitudinal Beam Steps |